Housing Hygiene Research Articles

Sick Houses: Towards a Transnational History of Housing Hygiene Surveys, 1889–1913

Summary Between 1889 and 1913, housing took centre stage in hygiene enquiries. Countless surveys across Europe sought to identify specific housing problems as health hazards. This paper explores the art of housing hygiene surveys in Belgium, France and Germany. Scrutinising surveys from Berlin, Liège and Paris, I characterise two contesting survey methods. On one hand, large-scale statistical surveys such as the sanitary register of houses in Paris aimed to establish robust epidemiological evidence on the connection between structural elements (like lighting and ventilation) and tuberculosis. On the other hand, monographic surveys adopted more idiosyncratic approaches, probing the relationship of housing and health from architectural, economic, hygienic and social angles, without insisting on a single vector of explanation. Although the era of monographic housing surveys was short-lived, it illuminates the complexity of housing as an epistemic object, which even today proves challenging to assess from a public health standpoint.

Shape analysis of the carpal joint in healthy and septic arthritis in newborn calves.

Septic arthritis is common in newborn calves due to poor birth and housing hygiene. This study investigated the pathological deformities caused by arthritis in the carpal bones of calves using geometric morphometry. The changes in the carpal joint bones of newborn calves with septic arthritis were examined through shape analysis. The study included 20 healthy Simmental calves and 30 Simmental calves with septic arthritis. Dorso-palmar x-ray images of the carpal joint were taken, and geometric morphometry was performed on these images using 25 landmarks. The first principal components (PC1) represented 26.92% of the total variation, while PC2 represented 13.84%. One of the most significant shape changes with increasing PC1 occurred in the os carpi intermedium. The study found that it was statistically possible to discriminate between radiometric carpal joint images of Simmental calves in the control and arthritis groups using geometric morphometry. In newborn calves with septic arthritis, the trochlea radi was located more proximally. There was an enlargement of the os carpi intermedium and a tendency towards the os carpi ulnare in female calves with septic arthritis. These results indicate significant bone deformation due to septic arthritis. Geometric morphometric methods can be clinically useful, as demonstrated in this study. Researchers can statistically explore these shape analyses, opening new avenues for research in this field. This method not only enhances our understanding of morphological changes but also provides a framework for clinical investigations and discoveries in related areas.

Effects of sanitary conditions with lipopolysaccharide injection and dietary valine supplementation on growth performance, immune response, bacterial profile, and microbial metabolites in weaned pigs

ABSTRACT This study investigated the effects of dietary L-valine (Val) supplementation and sanitary conditions with lipopolysaccharide injection on growth performance, immune response, and intestinal bacterial profiles and metabolites in weaned pigs. Thirty-two weaned pigs (6.98 ± 0.47 kg) were randomly assigned to treatments in a 2 × 2 factorial arrangement based on dietary Val levels and sanitary conditions (low or high). The pigs were fed either a basal diet containing the standard levels of Val suggested by (NRC), (2012) or a basal diet supplemented with 0.1% L-Val. A room designated as a high sanitary room was washed weekly, whereas the designated low sanitary room was not washed throughout the experiment and 5 kg of manure from the nursery pig barn was spread on the pen floors on day 1. All data were analysed using a mixed procedure of SAS, with the individual pen as the experimental unit. The pigs raised in low sanitary conditions exhibited a lower (p < 0.05) average daily gain, average daily feed intake, and gain-to-feed ratio and a higher (p < 0.05) incidence of diarrhoea than those raised in high sanitary conditions during the 14-d experimental period. The pigs in the low sanitary group also had a lower (p < 0.05) concentration of butyrate in the jejunum and a higher (p < 0.05) concentration of NH3-N in the colon than those in the high sanitary group. Dietary Val supplementation was reduced (p < 0.05) plasma interleukin (IL)-1β and IL-1 receptor antagonist concentrations as well as isovalerate and NH3-N concentrations in the colon, regardless of sanitary conditions. Interactions between dietary Val supplementation and sanitary conditions were observed in the abundances of mRNA-encoding β-defensins 113, 125 and 129 (p < 0.05). In conclusion, dietary Val supplementation beneficially modulates inflammatory responses and microbial metabolites regardless of sanitary conditions while transcriptional levels of β-defensins are regulated by dietary Val supplementation in a manner dependent on housing hygiene conditions.

Assessing the Effectiveness of a Massive Open Online Course for Caregivers Amid the COVID-19 Pandemic: Methodological Study.

The COVID-19 pandemic has presented significant challenges to health care systems, particularly impacting the older population due to their vulnerability and increased susceptibility to severe complications. Many of the most vulnerable individuals rely on informal caregivers, who play a vital role in enabling them to continue living in their homes. However, social isolation and limited access to health services during the pandemic have made caregiving more difficult. In response, massive open online courses (MOOCs) have emerged as a training and support solution for caregivers. This study focuses on a MOOC developed to assist caregivers during the pandemic, aiming to enhance their knowledge of COVID-19 and prevention measures and promote effective self-care practices. The study's aim is to develop and validate a MOOC integrating personal and housing hygiene measures to be adopted in self-care-related activities, surveillance, and monitoring by caregivers of the most vulnerable home-dwelling-dependent people, to provide safe care and prevent SARS-CoV-2 infection. A methodological study was developed. The content of the MOOC was developed based on scientific evidence and a Delphi study. The course was organized into 9 modules, addressing aspects related to safe self-care assistance and minimizing the risk of contagion. A convenience sample of 33 informal caregivers was recruited through a caregivers' association to verify the adequacy of the course. Knowledge questionnaires were administered before and after the course to assess the impact on caregivers' knowledge. The Family Caregiving Factors Inventory was used to evaluate caregiver resources, knowledge, expectations, and difficulties. Additionally, the technology acceptance model was applied to assess participants' satisfaction with the MOOC. Prior to attending the MOOC, participants demonstrated an average knowledge level score of mean 14.94 (SD 2.72). After completing the course, this score significantly increased to mean 16.52 (SD 2.28), indicating an improvement in knowledge. Caregivers found the course accessible, valuable, and applicable to their caregiving roles. Feedback regarding the MOOC's structure, illustrative videos, and language was overwhelmingly positive. Participants perceived the course as a valuable resource for decision-making in care delivery, leading to enhanced self-esteem and confidence. The MOOC has proven to be an effective tool for increasing caregivers' knowledge and empowering them in their roles. Remarkably, even low-literacy caregivers found the course valuable for its clear and understandable information. The MOOC demonstrated its adaptability to challenges faced during the pandemic, ensuring access to relevant information. This empowering strategy for caregivers has yielded positive outcomes. The MOOC represents a tool to support and empower informal caregivers, enabling them to provide optimal care during difficult times.

Failure of Passive Immunity Transfer Is Not a Risk Factor for Omphalitis in Beef Calves.

Omphalitis is the third most frequent disease in newborn calves after neonatal diarrhea and bovine respiratory disease (BRD), but limited data on the prevalence and risk factors are available in the literature. Failure of passive immunity transfer (FPIT) is recognized as a major risk factor for diseases and mortality in calves. However, the association between omphalitis and FPIT remains poorly described. To assess this association, 964 suckler beef calves from 22 farms were included in a longitudinal cohort study for 5 months. Each calf was examined twice (mean ages: 4.4 and 11.1 days old) to diagnose omphalitis through clinical examination and ultrasonographic evaluation (USE) if necessary. Measurements of the total solids percentage (TS-%Brix) and total protein (TP) were performed on the serum during the first visit to evaluate the calves' passive immunity status. FPIT (fair and poor) was defined as serum %Brix < 8.1 or TP < 5.1 g/dL; among calves with omphalitis, 14% had FPIT and among calves without omphalitis 12% had FPIT. The omphalitis prevalence was 32.3% in calves without any other disease (overall prevalence of 30.9%). No statistical association between the prevalence of omphalitis and FPIT was observed. Further research is needed to identify the risk factors and promote the prevention measures for omphalitis in cow-calf systems, such as calving difficulty, hygiene of housing, and navel disinfection.

Alteration of gut microbiota in wild-borne long-tailed macaques after 1-year being housed in hygienic captivity

The wild-born long-tailed macaques (Macaca fascicularis) were recently recruited and used as breeders for the National Primate Research Center of Thailand, Chulalongkorn University (NPRCT-CU), and changes in their in-depth gut microbiota profiles were investigated. The Oxford Nanopore Technology (ONT) was used to explore full-length 16S rDNA sequences of gut microbiota in animals once captured in their natural habitat and 1-year following translocation and housing in a hygienic environment at NPRCT-CU. Our findings show that the gut microbiota of macaques after 1 year of hygienic housing and programmed diets feeding was altered and reshaped. The prevalent gut bacteria such as Prevotella copri and Faecalibacterium prausnitzii were enriched after translocation, causing the lower alpha diversity. The correlation analysis revealed that Prevotella copri, Phascolarctobacterium succinatutens, and Prevotella stercorea, showed a positive correlation with each other. Significantly enriched pathways in the macaques after translocation included biosynthesis of essential amino acids, fatty acids, polyamine and butanoate. The effects of microbiota change could help macaques to harvest the energy from programmed diets and adapt their gut metabolism. The novel probiotics and microbiota engineering approach could be further developed based on the current findings and should be helpful for captive animal health care management.

High-rise apartment quality evaluation and related demographic factors: lesson from RentSafeTO programme

ABSTRACT With the rapid increase in urbanization and the number of residents living in high-rise apartment buildings, the quality of living environments in terms of the facility, safety and hygiene of high-rise housing has become an important topic. Although numerous studies have investigated occupant satisfaction through subjective assessment, only few studies have used objective assessment methods, such as expert evaluation, to elucidate the quality of high-rise apartments and the related occupancy factors. According to the dataset from Toronto's RentSafeTO programme, which provides the results for 9928 high-rise apartments evaluated using 20 quality indicators, this study conducted a factor analysis and identified two main factors for assessing high-rise housing: building structure and building facilities. Furthermore, this study used multiple regression models and census data to analyse the housing quality at the regional level. The results of social housing and private housing differed. Labour force attributes, education, immigration and ethnic origin significantly affected the quality of private housing. The results provide important directions for the post-occupancy evaluation of high-rise apartments. In addition, demographic factors significantly affected residential quality. This study provides a basis for the government to formulate equal and unbiased support for high-rise building maintenance and management.

Hygiene of housing conditions and proinflammatory signals alter gene expressions in porcine adipose tissues and blood cells.

Adipose tissue is an organ with metabolic, endocrine and immune functions. In this tissue, the expressions of genes associated with several metabolic pathways, including lipid metabolism, have been shown to be affected by genetic selection for feed efficiency, an important trait to consider in livestock. We hypothesized that the stimulation of immune system caused by poor hygiene conditions of housing impacts the molecular and cellular features of adipose tissue and that the impact may differ between pigs that diverge in feed efficiency. At the age of 12 weeks, Large White pigs from two genetic lines divergent for residual feed intake (RFI) were housed in two contrasting hygiene conditions (good vs poor). After six weeks of exposure, pigs were slaughtered (n=36). Samples of blood, subcutaneous (SCAT) and perirenal (PRAT) adipose tissues were collected for cell response and gene expression investigations. The decrease in the relative weight of PRAT was associated with a decline in mRNA levels of FASN, ME, LCN2 and TLR4 (P<0.05) in pigs housed in poor conditions compared with pigs housed in good conditions for both RFI lines. In SCAT, the expressions of only two key genes (PPARG and TLR4) were significantly affected by the hygiene of housing conditions. Besides, the mRNA levels of both LCN2 and GPX3 were influenced by the RFI line (P<0.05). Because we suspected an effect of poor hygiene at the cellular levels, we investigated the differentiation of stromal vascular cells isolated from SCAT in vitro in the absence or presence of a pro-inflammatory cytokine, Tumor Necrosis Factor-α (TNF-α). The ability of these cells to differentiate in the absence or presence of TNF-α did not differ among the four groups of animals (P>0.05). We also investigated the expressions of genes involved in the immune response and lipid metabolism in whole blood cells cultured in the absence and presence of LPS. The hygiene conditions had no effect but, the relative expression of the GPX3 gene was higher (P<0.001) in high RFI than in low RFI pigs while the expressions of IL-10 (P=0.027), TGFβ1 (P=0.023) and ADIPOR2 (P=0.05) genes were lower in high RFI than in low RFI pigs. Overall, the current study indicates that the hygiene of housing had similar effects on both RFI lines on the expression of genes in adipose tissues and on the features of SCAT adipose cells and whole blood cells in response to TNF-α and LPS. It further demonstrates that the number of genes with expression impacted by housing conditions was higher in PRAT than in SCAT. It suggests a depot-specific response of adipose tissue to the current challenge.

Improving Health through Green Deal and Climate Pact (motivation for WB Region)

Abstract The WB Green Agenda (WB GA) aims to implement the GD principles in this region and has defined five priority areas: climate, energy, mobility; circular economy, pollution reduction, sustainable agricultural and food production, and biodiversity. Some of the WB GA goals are strongly related to health: e.g. the continent's carbon neutrality by 2050, the ambitious climate policy, the reform of energy and transport sectors. The launch of the EU CP is an important opportunity for the WB to promote action in this area. For instance, promoting energy efficiency and supporting building renovation are directly related to the quality of life and hygiene of housing. Reduction or cancellation of coal subsidies as well as the region's withdrawal from the use of coal is of great importance for reducing externalities. In the WB, citizens are concerned about their health due to air, water and soil pollution and their reduction is in the common interest. To that end, it is necessary, inter alia, to: ratify the Convention on Long-range Transboundary Air Pollution and its protocols in each of the WB economies; to implement air quality strategies; and to strengthen air quality monitoring systems (and network accreditation). Appropriate processes are needed to reduce water and soil pollution, as well as to ensure the transformation of the agricultural sector. It is also necessary to harmonize the agricultural and food sector with EU standards for food safety, plant and animal health and environmental protection. To achieve the WB GA goals it is important to develop policy strategies based on the most up-to-date scientific studies for this region (JRC, 2020). On the basis of the analysis presented in this study we conclude that the processes associated with the GD and the CP will be of benefit for both individual and public health in the EU and in the WB.

216 Effect of Dietary L-valine Supplementation on Growth Performance, Immune Response, and Microbial Metabolites in Weaned Pigs Raised in Varying Sanitary Conditions

Abstract This study investigated the effects of dietary L-valine supplementation and sanitary conditions on growth performance, immune response, and microbial metabolites in weaned pigs. Thirty-two weaned pigs (6.98 ± 0.47 kg) were randomly assigned to treatments in a 2 × 2 factorial arrangement based on dietary Val level and sanitary condition (clean or unclean). The pigs were fed either a basal diet containing the standard levels of Val suggested by NRC (2012) or the basal diet with an additional 0.1% of L-Val. A room designated as the clean room was washed weekly, whereas the designated unclean room was not washed throughout the experiment and 5 kg of manure from the nursery pig barn was spread on the pen floors on day 1. All data were analyzed using a mixed procedure of SAS, with the individual pen as the experimental unit. The pigs raised in unsanitary conditions exhibited a lower average daily gain and average daily feed intake and a higher incidence of diarrhea than those raised in sanitary conditions during the 14-day experimental period (P &amp;lt; 0.05). The pigs in the unclean group also had a lower concentration of butyrate in the jejunum and a higher concentration of ammonia-N in the colon than those in the clean group (P &amp;lt; 0.05). Dietary valine supplementation reduced plasma interleukin (IL)-1α and IL-1 receptor antagonist concentrations as well as isovalerate and ammonia-N concentrations in the colon (P &amp;lt; 0.05). Interactions between dietary Val supplementation and sanitary conditions were observed in the abundance of mRNA-encoding β-defensins 113, 125, and 129 (P &amp;lt; 0.05). In conclusion, dietary Val supplementation beneficially modulates inflammatory response and microbial metabolites regardless of sanitary condition, while transcriptional levels of β-defensins are regulated by dietary Val supplementation in a manner dependent on housing hygiene conditions.

Major Causes of Calf Morbidity and Mortality in Smallholder Dairy Farms in Shashemene Town, Ethiopia

A cross-sectional study was conducted to determine the major causes of calf morbidity and mortality in smallholder dairy farms and associated potential risk factors in Shashemene. A total of 187 calves from 46 farms were included in the present study. The overall crude morbidity and crude mortality rates were 27.8% and 6.4%, respectively. The most frequent disease syndrome was diarrhea with incidence rate of 28(15%) followed by pneumonia 8(4.3%), Gastrointestinal tract (GIT) disorder 8(4.3%) and septicemia 5(2.7%). In addition skin lesion, navel ill and unidentified cases were encountered. The main causes of death were diarrhea 6(3.2%), Septicemia 2(1.1%), GIT disorder 2(1.1%), pneumonia 1(0.5%) and others 1(0.5%). The most important risk factors associated with morbidity and mortality were housing hygiene, floor condition and calf size in farm. Out of 187 calves examined for GIT parasites; 63(33.3%) were positive for nematode eggs. Prevalence of helminthes parasite increased with increasing age, showing higher prevalence (P&lt;0.05) in calves above 2 months than in calves below 2 months of age. Besides, majority of the calves, 48(25.7%) were found positive for coccidian oocyst. In general; diarrhea, pneumonia and septicemia were the major causes of calf morbidity and mortality. Interms of risk factors housing hygiene, floor condition, calf size in the farms, age and breed were identified major role players. Therefore, identifying major causes and improving management practices and breed should be given to emphasis by advisory of smallholder dairy farms.

Breeding and Maintenance of Immunodeficient Mouse Lines under SPF Conditions-A Call for Individualized Severity Analyses and Approval Procedures.

Simple SummaryIn the EU, the breeding of genetically modified laboratory animals is defined as an animal experiment, if the animals may experience pain, suffering or harm due to the genetic modification. In most cases, modifications of the immune system do not lead to pain, suffering, or harm given the animals are kept under specific pathogen-free housing conditions. Nevertheless, the EU working group on genetically altered animals defined SPF housing conditions as “Refinement”. According to this working group, applied refinement strategies for breeding genetically modified animals do not exclude them from project licensing. Thus, theoretical suffering, pain or harm is assumed without applying methods of actual burden assessment. Furthermore, the definition of SPF as a refinement strategy rather than a standard husbandry procedure leads to incomprehension among the scientific community in the EU. Here, we discuss the ethical basis of animal experiments as well as the current legal situation for immunodeficient animals. Furthermore, we discuss potential pain, suffering, or harm of immunodeficient animals from an immunological perspective. Finally, we briefly outline an animal welfare-oriented approach to severity assessment of immunodeficient mice.In the EU, the breeding of genetically modified laboratory animals is, by definition, an animal experiment if the offspring may experience pain, suffering, or harm. In order to determine the actual burden of genetically modified mice, established methods are available. However, the breeding of immunodeficient mice is considered an experiment requiring a permit, even if no pain, suffering or harm is observed under scientifically required defined hygienic housing conditions, as determined by established methods of severity assessment. This seems contradictory and leads to uncertainty among scientists. With this commentary, we would like to shed light on this topic from different perspectives and propose a solution in terms of individualized severity assessment and approval procedures.

Identification of blood immune and metabolic indicators explaining the variability of growth of pigs under contrasted sanitary conditions

BackgroundHealth and growth of pigs are affected by the hygiene of housing. Lower growth performance observed in poor hygiene of housing conditions is explained by reduced feed intake and metabolic changes caused by the activation of body defences. In a previous experiment, we reported contrasted average values of body weight gain, concentrations of circulating metabolites, redox and immune indicators in blood of pigs housed in good or poor hygiene conditions during the growing period. This study addressed inter-individual variability in these responses to determine whether a particular blood profile explains average daily gain (ADG) of the pig.ResultsThe data originated from 160 growing pigs, half of which subjected to a hygiene challenge for 6 weeks (W0 to W6) and the others housed in good hygiene conditions. Pigs originated from two lines divergently selected for residual feed intake (RFI). Individual body weights were recorded during this period, and relative ADG (rADGW0-W6) was calculated as the ADG corrected by the initial body weight measured at W0. Blood samples were taken before (W0) and 3 weeks (W3) after the beginning of the challenge. The analysed dataset consisted of 51 metabolites and indicators of immune and inflammatory responses measured on 136 pigs having no missing value for any variables, when calculated as the differences W3 minus W0 in circulating concentrations. An algorithm tested all possible linear regression models and then selected the best ones to explain rADGW0-W6. Six variables were identified across the best models and correlated with rADGW0-W6 with a goodness of fit (adjusted R2) of about 67%. They were changes in haptoglobin, global antioxidant capacity of plasma (Biological Antioxidant Power or BAP), free fatty acids, and 3 amino acids: leucine, tryptophan, and 1-methylhistidine. The effects of housing conditions and RFI lines were comprised in the variables of the selected models and none of these conditions improved accuracy of the predictive models, leading to genericity of the pinpointed metabolic changes in relation to variability of ADG.ConclusionsThis approach allows us to identify blood variables, whose changes in blood concentrations correlated to ADG under contrasted sanitary conditions.

Effect of housing condition on quality of life.

This study examined the housing effect on quality of life among Japanese people. In the current cross-sectional study, we analyzed the 1-year of data (November 2015-March 2016) with 2533 participants. We used the Short Form-8 questionnaire, an 8-item instrument that measures general aspects of health-related QOL. Comprehensive Assessment System for Built Environment Efficiency housing checklist which was developed by Ministry of Land, Infrastructure, Transport and Tourism was used to assess the housing aspects. This checklist has six health elements including thermal comfort, acoustic environment, lighting environment, hygiene, safety, and security for 8 distinctive rooms/places of home. Multilevel analysis was done to identify the relationship between the perceived level of housing problem and PCS and MCS by clustering by sex. Compared to those who always felt unsafe at home due to interior design problem, participants who never felt unsafe showed an average of 10.51 (95% CI=7.69-13.34, p<0.0001) and 5.78 (95% CI=2.90-8.65, p<0.0001) higher physical and mental component score (better quality of life), respectively. Those who never had thermal, acoustic, lighting, hygiene, and security problems of housing also exhibited significantly better quality of life compared to participants who felt these problems.

PREVALENCE OF PULMONARY TUBERCULOSIS AMONG CHILDREN LIVING IN SAMARU, ZARIA, NIGERIA: A CASE STUDY OF ‘AL MAJIRI’ CHILDREN

Tuberculosis is an infectious disease caused by Mycobacterium tuberculosis, and it is still a major health problem in Nigeria especially among people with poor socio-economic status. This study was conducted with the aim of determining the prevalence of tuberculosis among two study subjects living in Hayin Dogo community of Samaru, Zaria, Kaduna state: “Al majirai” (Qur’anic school children) and children showing respiratory symptoms The major focus of this study is the al majirai, due to their unhygienic, overcrowded living environments and poor nutritional status. Two hundred sputum samples were collected from the al-majirai, and one hundred from the other children; convenience sampling method was employed. The samples were stained using the Ziehl Neelsen technique and observed microscopically for the presence of acid fast bacilli. The prevalence of acid fast bacilli (AFB) among the Al majirai was 0%, and 12% among the children attending the medical center. Symptoms such as night sweat and bloody sputum, as well as risk factors such as malnutrition and poor housing hygiene were found to be significantly associated with the infection in the children showing respiratory symptoms and attending the Ahmadu Bello University medical center (P&lt;0.05). Highest occurrence of the AFB was observed in children within the ages, 15-18 years, as well as among the male children. Even though a high percentage of the Almajirai were exposed to overcrowding (86%) and poor housing hygiene (79%), there were no positive cases among them. Perhaps, other diagnostic methods other than Ziehl Neelsen could provide more comprehensive information.

Some Udder Problems associated with productivity in Goats

The aim of this article was study the mastitis of a goat under farmer Egyptian conditions. This work was conducted on a private farm containing50baladigoats suffering from symptoms of mastitis. All environmental factors were recorded as housing condition, breeding, health problems, production and feeding. Morphological examination of the udder were carried out. Milk samples of infected goats, were collected for bacterial isolation and sensitivity test. Animals were treated with systemic and local intramammary broad spectrum antibiotic. The results indicated that, 35 cases (70 %) were responded to treatment, and showed normal reproductive and productive performances.15 cases (30 %) of chronic mastitis do not respond to treatment and breeding. Post-mortem examination of these cases revealed widespread diffused chronic mastitis throughout the affected udder. Tissue specimens of infected udder and supra mammary lymph node were fixed in 10% formalin for histopathological examination. Bacteriological examination revealed isolation of Staph aureus, Corynebacterium pyogenes, Salmonella spp., E coli in a single or mixed with other bacteria as Pasteurella spp. Fungus suspect Asperigillus spp. infection and yeast, suspect Candida spp. Pathological examination revealed chronic diffused suppurative and chronic granulomatous mycotic mastitis. In conclusion, mastitis is an important disease of goats and prevention of infection is the key for disease control. Good environ mental and hygienic housing of milking practices are a necessity to minimize the impact of this disease.

Bacterial concentrations in bedding and their association with dairy cow hygiene and milk quality

Comparison of bacterial counts (BCs) among common bedding types used for dairy cows, including straw, is needed. There is concern that the microbial content of organic bedding is elevated and presents risks for dairy cow udder health and milk quality. The objectives of this study were to investigate: (1) % DM and BCs (Streptococcus spp., all gram-negatives and specifically Klebsiella spp.) in different types of bedding sampled, and to investigate housing and farm management factors associated with % DM and BCs; (2) if bedding type was associated with hygiene of cow body parts (lower-legs, udder, upper-legs and flank) and housing and management factors associated with hygiene and (3) bedding types associated with higher BCs in cow milk at the farm level and bulk tank milk and management factors that were associated with highest BCs. Seventy farms (44 free-stall and 26 tie-stall) in Ontario, Canada were visited 3 times, 7 days apart from October 2014 to February 2015. At each visit, composite samples of unused and used bedding were collected for % DM determination and bacterial culture. Used bedding samples were collected from the back third of selected stalls. Data were analyzed using multivariable linear mixed models. Bedding classification for each farm were: new sand (n = 12), straw and other dry forage (n = 33), wood products (shavings, sawdust; n = 17) and recycled manure solids (RMSs)-compost, digestate (n = 8). In used bedding, across all bedding samples, sand was driest, compared to straw and wood, and RMS; higher % DM was associated with lower Streptococcus spp. count. Streptococcus spp. and all Gram-negative bacteria counts increased with increasing days since additional bedding was added. Gram-negative bacteria counts in used bedding varied with type: RMS = 16.3 ln colony-forming units (cfu)/mL, straw = 13.8 ln cfu/mL, new sand = 13.5 ln cfu/mL, and wood = 10.3 ln cfu/mL. Klebsiella spp. counts in used bedding were lower for wood products (5.9 ln cfu/mL) compared to all other bedding types. Mean cow SCC tended to be higher on farms with narrower stalls. Farms with mattress-based stalls had a higher prevalence of cows with dirty udders compared to those using a deep bedding system (often inorganic sand). Wider stalls were associated with lower bulk milk bacteria count. Lower % DM of used bedding was associated with higher bulk milk bacteria count. In conclusion, bedding management may have a profound impact on milk quality, bacterial concentrations in the bedding substrates, and cow hygiene.

Tissue-specific responses of antioxidant pathways to poor hygiene conditions in growing pigs divergently selected for feed efficiency

BackgroundPoor hygiene of housing induces a systemic inflammatory response. Because inflammation and oxidative stress are processes that can sustain each other, the ways pigs are able to activate their antioxidant defenses are critical for production performance and health during periods when the immune system is solicited. Selection for production performance can also influence reactive oxygen species (ROS) production and expression levels of genes involved in cellular response to oxidative stress in different tissues. To establish the extent by which poor hygiene and selection for feed efficiency affected redox status, pigs divergently selected for residual feed intake (RFI) were housed in poor or good hygiene during 6 weeks. At the end, blood was collected in all pigs, and half of them were killed for tissue sampling. The remaining pigs were reared in good hygiene conditions during a recovery period of 7–8 weeks.ResultsAt week 6, poor hygiene was associated with a lower total antioxidant capacity assessed by plasma ferric reducing ability in all pigs, and with greater plasma levels of hydrogen peroxides in the high RFI pigs (less efficient). Adipose tissue of high RFI pigs exhibited higher activities of catalase and glutathione reductase, and greater thiobarbituric acid reactive substances (TBARS) concentrations when compared with the low RFI pigs (more efficient). Poor hygiene conditions activated the antioxidant enzymes activities (glutathione reductase, superoxide dismutase and catalase) in adipose tissue of both lines, but led to higher ROS production by mature adipocytes isolated from the high RFI pigs only. In liver and muscle, there were only minor changes in antioxidant molecules due to genetics and hygiene conditions. After the resilience period, adipose tissue of pigs previously challenged by poor hygiene maintained higher antioxidant enzyme activities, and for the high RFI line, displayed higher TBARS concentrations.ConclusionsPigs selected for improved feed efficiency showed a lower susceptibility to oxidative stress induced by poor hygiene conditions. This could led to a lower inflammatory response and less impaired growth when these pigs are facing sanitary challenges during the production period.

Contested Architecture: The ‘Woba’ Residential Colony in Basel, 1930

In 1930, a housing exhibition called ‘Woba’ took place in the city of Basel. Unique for Switzerland, the commercial aspect of the furniture industry was complemented by a newly constructed residential colony. In accordance with discussions held one year before at the II CIAM congress in Frankfurt a. M., the Wohnung für das Existenzminimum was brought to life. Thirteen architectural offices experimented with different spatial designs in order to develop cheap and hygienic housing for the working class. For one month, some of the houses were open to the public. In the Swiss press, a vivid and controversial debate arose. On one side, its supporters advocated for standardized and rationalized housing as an appropriate way of living for modern individuals. On the other side, conservative forces saw a communist scheme at work in this housing in the style of Neues Bauen. By analyzing contemporary press articles on the Woba, this paper shows that the question of society’s future was being negotiated through architecture and furniture.

The Possibility of Contamination of Water-Soil Environment as a Result of the Use of Pig Slurry

AbstractPig slurry is a heterogeneous mixture of faeces, urine, undigested remains of feed items and water used for flushing of animal excrement and to maintain the proper hygiene of livestock housing. It is formed on farms which use the non-bedding system of pig breeding i.e. animals are kept on the partially or fully slatted floors. According to the Polish law pig slurry is defined as a liquid natural fertilizer intended for agricultural use. The storage and application of pig slurry on arable land affect the surroundings and may create a number of serious risks related to, among others, the pollution of water-soil environment with biogenic elements, heavy metals, pathogens and pharmaceuticals. The article presents the reasons for the occurrence of excessive amounts of nitrogen, phosphorus, copper, zinc and antibiotics in pig slurry. The possibility of microbial and pharmaceutical contamination of water, soil and plants as well as their pollution with biogens and heavy metals as a result of improper storage and excessive spreading of pig slurry have been characterized. Moreover, methods of preventing the above-mentioned threats with reference to Polish and EU legal acts have been discussed.