Human Animal Research Articles

On your terms or mine: pigs’ response to imposed gentle tactile contact vs. free form interaction with a familiar human

AbstractPositive human–animal interactions (HAIs) can be intrinsically rewarding and facilitate positive human–animal relationships. However, HAI paradigms vary across studies, and the influence of different interaction paradigms on the animal’s response has been overlooked. We compared the behavioural responses of pigs (n = 28) individually tested with two types of gentle tactile interactions with a familiar human: ‘free form (FF)’ where the pig could voluntarily approach and interact as they normally would, and ‘imposed contact (IC)’ where the human imposed tactile contact on the pig according to a standardised protocol. Pigs did not differ in their level of engagement with the human between the two types of interactions. However, they differed in their behaviour as they explored the pen more during the FF test, while they emitted more low-pitched vocalisations (grunts) during the IC test. These differences can likely be imputed to the IC test differing to the pigs’ habituation to human contact, which could have evoked greater attention to the human or triggered frustration due to violation of expectation. These findings highlight the influence of the predictability of the interaction or level of agency provided to the animal in HAI tests and relation to their previous experience of interacting.

Seroprevalence of brucellosis among cows and sheep in Assiut province: A pilot study

Brucellosis is a common neglected zoonotic disease with a global geographic distribution that endangers human health and animal production. However, there is a scarcity of studies focusing on brucellosis in neglected regions such as Assiut governorate in Egypt. Therefore, the objective of this study was to investigate the prevalence of antibodies reactive to Brucella sp. in sheep and cows, as well as the associated risk factors, in Assiut governorate. A total of 184 sheep and 166 cows were included in the study, and their serum samples were subjected to screening using the Rose-Bengal plate test, followed by confirmation through the serum tube agglutination test. The overall seroprevalence of Brucella antibodies in sheep of 8.2% (15/184), while in cows, the seroprevalence was 1.2% (2/166). Among sheep, the seropositivity for Brucella abortus was 4.3% (8/184), whereas for Brucella melitensis, it was 6% (11/184). In cows, one cow displayed seropositivity for Brucella abortus, while the other exhibited mixed infection with both Brucella abortus and Brucella melitensis. Moreover, animals originating from villages bordering Sohag governorate demonstrated a higher risk of contracting brucellosis while other risk factors did not impact the occurrence of brucellosis. In conclusion, this study provides compelling evidence of the endemic nature of brucellosis in the investigated areas, with a particularly high prevalence observed in sheep. Both cows and sheep are susceptible to infection by either Brucella abortus or Brucella melitensis. To gain a comprehensive understanding of the epidemiological factors associated with infection, it is imperative to conduct large-scale surveys that incorporate molecular isolation of various Brucella species to facilitate the development of appropriate prevention strategies.

Genetic Characterization and Breeding Habitats of Black Fly (Diptera, Simuliidae) Vector Species in Laos

Genetic diversity and ecology are two important aspects of vector species crucial to a full understanding of disease epidemiology. In this study, we examined genetic diversity, genetic structure and the physiochemical parameters of the breeding habitats of the two significant black fly vector species, Simulium chumpornense Takaoka and Kuvangkadilok and S. nodosum Puri, from Laos. Genetic diversity of S. chumpornense in Laos was relatively high with maximum genetic divergence of 3.05% but no significant genetic differentiation between populations. Comparisons with conspecific populations from Thailand also found no genetic differentiation between the two countries. This possibly related to the recent history of this species, as a very recent (31,000 years ago) historical population expansion was detected. Physicochemical parameters of the breeding habitats suggest the ability to utilize diverse stream sizes from small flows (1 m wide) to huge rivers (290 m or more wide). Populations of S. nodosum from Laos had low genetic diversity with maximum genetic divergence of 2.56% and no genetic structuring among populations. Comparisons with those reported from other countries revealed five genetically divergent lineages (I–V) with minimum genetic divergence of 1.36%. The majority (42 of 52) of specimens from Laos belonged to lineage I and the remaining (10) comprised lineage II. Lineage I is the largest and representative of specimens from Thailand, Myanmar, Vietnam, Taiwan and Laos. Population history analysis revealed that lineage I had undergone recent demographic expansion dating back to 7000 years ago. This very recent population expansion resembles others reported from Thailand and possibly indicates a response to increasing human and domestic animals following the agricultural revolution. Breeding sites of S. nodosum are diverse in respect to elevation, velocity, water conductivity and streambed particle size. The ability to utilize a wide variety of breeding sites could promote the production of a large adult population, which can be a pest for humans and other animals.

Healing Hives: Exploring the Effects of Beekeeping on Veteran Mental Health and Quality of Life

Veterans experience higher risks of suicide and mental health disorders due to the traumas of military service, disabilities, and the difficulties of reassimilation into civilian life. Therapeutic interventions using human-animal interactions have shown promising results in reducing many risk factors affecting veterans’ quality of life. This quality improvement project sought to consider if veterans participating in a recreational therapy program focused on beekeeping and administered by the Department of Veteran Affairs would experience quality of life improvements using a standardized EQ-5D-5L assessment. Our results indicate significant changes in mobility, anxiety/depression, and overall health for veterans participating in beekeeping as a recreational therapy. Implications for practice and future research are presented.

From Popularity to Suppression: Cockfighting and English Society c.1730 to the 1835 Cruelty to Animals Act

ABSTRACT The reasons for cockfighting's relatively successful legal suppression by Act of Parliament in 1835 were complex, subtle and nuanced. This study begins by placing cockfighting's social and cultural functioning across the period from c. 1750 to 1835 in far clearer historical context, stressing the centrality of wagering. During this period, cocking had a key place in the cultural wars that increasingly focused on so called ‘blood sports' and animal-human relationships. Opposition to cockfighting came from two directions: concerns about animal suffering and the behaviour of attenders. There was a decline in plebeian cockfight reportage after 1800 but cockfighting continued to enjoy support amongst some groups, most importantly within the elite, up to and beyond 1835. There was increased humanitarian concern about cocks’ treatment, although such concerns were still not widely accepted. The success of reformers was less due to worries about cruelty to animals per se, than to their ability to link cockfighting to human behaviour and notions of moral degeneration such as gambling or drinking. Increased attacks on these aspects from the 1770s led by local magistrates, more pressure on Parliament from the 1820s, and wider social changes in the early 1830s, finally led to the Act.

Exploring longitudinal associations between farmer wellbeing and the welfare of their livestock. The HUNT Study, Norway

The One Welfare approach acknowledges the interrelationships between human wellbeing and animal welfare. Early research has suggested associations between stockperson wellbeing and livestock welfare, however these scenarios are complex and challenging to untangle.In this study, we utilised merged data from over 700 farms to explore associations between farmer wellbeing and livestock welfare. The farms were engaged in cattle, sheep, and/or swine production in Norway between 2017 and 2020. The farmers participated in a general population-based health survey, and livestock welfare was measured using routinely collected, animal-based abattoir observations of over 480,000 animals. We determined a farm’s overall livestock welfare relative to the other farms and calculated within-farm differences in this relative welfare level over time. A subset of enterprises (n=328) with sufficient and non-ambiguous farmer wellbeing information were then used to explore differences in these within-farm differences by farmer wellbeing status. We found that poor farmer wellbeing — whether it was defined by anxiety symptoms, depression symptoms, symptoms of psychological distress, or life satisfaction — was associated with a deterioration in overall livestock welfare level (in terms of the mean of the farm’s abattoir observed welfare indicators). There was evidence that this association persisted for at least two years.Given societal concerns regarding sustainable food production, farmer wellbeing, and livestock welfare, further research is indicated to explore the complex farmer-livestock relationship within the One Welfare framework. This study suggests that using within-farm changes in relative livestock welfare derived from routinely collected information can be a useful approach.

Capitalizing on Animality: Monstrosity and Multispecies Relations in Jordan Peele’s Nope (2022)

One amongst many of the defining characteristics of so-called ‘late stage’ capitalism are human-animal relationships that have become acrimonious, hostile, or even monstrous in nature. A foundational premise of monster theory, and one that Jeffrey Jerome Cohen’s seminal 1996 edited collection of the same name suggests, is that the construction of the monster in popular culture is fraught with the boundaries that constitute the society that has spawned them; the monstrous body “exists only to be read” (p. 4). Bringing together the theoretical insights of the Marxist theory of reification, critical animal studies, and monster theory, this article examines the ways in which cinematic depictions of gigantic monstrosity can inform our theorizing of multispecies relationships under capitalism. Specifically, I explore how the tensions between capital and human-animal relationships serve to construct and constitute the multiform monster, Jean Jacket, in Jordan Peele’s 2022 film Nope. Through an examination of the multispecies relationalities that the film portrays, I argue that the figure of Jean Jacket is a monstrous culmination of the reified and therefore, necessarily deferred nature of human-animal relationships under capital. However, Nope’s conclusion alerts us to the radical dereifying potential of multispecies bonds of care and embodied knowledge; systems of resistance that can be forged even within our current capitalist ruins.

Antimicrobial Resistance: What Lies Beneath This Complex Phenomenon?

Antimicrobial Resistance (AMR) has evolved from a mere concern into a significant global threat, with profound implications for public health, healthcare systems, and the global economy. Since the introduction of antibiotics between 1945 and 1963, their widespread and often indiscriminate use in human medicine, agriculture, and animal husbandry has led to the emergence and rapid spread of antibiotic-resistant genes. Bacteria have developed sophisticated mechanisms to evade the effects of antibiotics, including drug uptake limitation, drug degradation, target modification, efflux pumps, biofilm formation, and outer membrane vesicles production. As a result, AMR now poses a threat comparable to climate change and the COVID-19 pandemic, and projections suggest that death rates will be up to 10 million deaths annually by 2050, along with a staggering economic cost exceeding $100 trillion. Addressing AMR requires a multifaceted approach, including the development of new antibiotics, alternative therapies, and a significant shift in antibiotic usage and regulation. Enhancing global surveillance systems, increasing public awareness, and prioritizing investments in research, diagnostics, and vaccines are critical steps. By recognizing the gravity of the AMR threat and committing to collaborative action, its impact can be mitigated, and global health can be protected for future generations.

N-acetyl-L-cysteine reduces testis ROS in obese fathers but fails in protecting offspring from acquisition of epigenetic traits at cyp19a1 and IGF11/H19 ICR loci.

Paternal nutrition before conception has a marked impact on offspring's risk of developing metabolic disorders during adulthood. Research on human cohorts and animal models has shown that paternal obesity alters sperm epigenetics (DNA methylation, protamine-to-histone replacement, and non-coding RNA content), leading to adverse health outcomes in the offspring. So far, the mechanistic events that translate paternal nutrition into sperm epigenetic changes remain unclear. High-fat diet (HFD)-driven paternal obesity increases gonadic Reactive Oxygen Species (ROS), which modulate enzymes involved in epigenetic modifications of DNA during spermatogenesis. Thus, the gonadic pool of ROS might be responsible for transducing paternal health status to the zygote through germ cells. The involvement of ROS in paternal intergenerational transmission was assessed by modulating the gonadic ROS content in male mice. Testicular oxidative stress induced by HFD was counterbalanced by N-acetylcysteine (NAC), an antioxidant precursor of GSH. The sires were divided into four feeding groups: i) control diet; ii) HFD; iii) control diet in the presence of NAC; and iv) HFD in the presence of NAC. After 8weeks, males were mated with females that were fed a control diet. Antioxidant treatment was then evaluated in terms of preventing the HFD-induced transmission of dysmetabolic traits from obese fathers to their offspring. The offspring were weaned onto a regular control diet until week 16 and then underwent metabolic evaluation. The methylation status of the genomic region IGFII/H19 and cyp19a1 in the offspring gDNA was also assessed using Sanger sequencing and methylation-dependent qPCR. Supplementation with NAC protected sires from HFD-induced weight gain, hyperinsulinemia, and glucose intolerance. NAC reduced oxidative stress in the gonads of obese fathers and improved sperm viability. However, NAC did not prevent the transmission of epigenetic modifications from father to offspring. Male offspring of HFD-fed fathers, regardless of NAC treatment, exhibited hyperinsulinemia, glucose intolerance, and hypoandrogenism. Additionally, they showed altered methylation at the epigenetically controlled loci IGFII/H19 and cy19a1. Although NAC supplementation improved the health status and sperm quality of HFD-fed male mice, it did not prevent the epigenetic transmission of metabolic disorders to their offspring. Different NAC dosages and antioxidants other than NAC might represent alternatives to stop the intergenerational transmission of paternal dysmetabolic traits.

A humanized monoclonal antibody targeting an ectonucleotidase rescues cardiac metabolism and heart function after myocardial infarction.

Myocardial infarction (MI) results in aberrant cardiac metabolism, but no therapeutics have been designed to target cardiac metabolism to enhance heart repair. We engineer a humanized monoclonal antibody against the ectonucleotidase ENPP1 (hENPP1mAb) that targets metabolic crosstalk in the infarcted heart. In mice expressing human ENPP1, systemic administration of hENPP1mAb metabolically reprograms myocytes and non-myocytes and leads to a significant rescue of post-MI heart dysfunction. Using metabolomics, single-nuclear transcriptomics, and cellular respiration studies, we show that the administration of the hENPP1mAb induces organ-wide metabolic and transcriptional reprogramming of the heart that enhances myocyte cellular respiration and decreases cell death and fibrosis in the infarcted heart. Biodistribution and safety studies showed specific organ-wide distribution with the antibody being well tolerated. In humanized animals, with drug clearance kinetics similar to humans, we demonstrate that a single "shot" of the hENPP1mAb after MI is sufficient to rescue cardiac dysfunction.

Neurosurgical Microvascular Anastomosis: Systematic Review of the Existing Simulators and Proposal of a New Training Classification System.

The literature lacks a combined analysis of neurosurgical microvascular anastomosis training models. We performed a systematic literature search to provide an overview of the existing models and proposed a classification system based on the level of simulation and reproducibility of the microvascular anastomosis. The systematic literature search followed the PRISMA guidelines. We consulted MEDLINE, Web of Knowledge, and EMBASE independently for papers about bypass training models. Every training model was analyzed according to six tasks supposed to esteem their fidelity to the real operative setting by using a scoring system from zero to two. Finally, authors classified the models into five classes, from A to E, by summing the individual scores. This study included 109 papers for analysis. Training models were grouped into synthetic tubes, ex vivo models (animal vessels, fresh human cadavers, human placentas) and in vivo simulators (live animals-rats, rabbits, pigs). By applying the proposed classification system, live animals and placentas obtained the highest scores, falling into class A (excellent simulators). Human cadavers and animal vessels (ex vivo) were categorized in class B (good simulators), followed by synthetic tubes (class C, reasonable simulators). The proposed classification system helps the neurosurgeon to analyze the available training models for microvascular anastomosis critically, and to choose the most appropriate one according to the skills they need to improve.

Camel Milk Yield and Composition and its Adjuvant Potential Impacts on Health of Consumers: A Review

Dromedaries can be integrated efficiently into an extensive and intensive management milk production systems for producing milk. Camel milk has specific nutritional values that alleviate certain diseases. The camel milk can be produced under harsh and intensive management conditions. Camel milk was given to human and experimental animal species under normal and dysfunction conditions as hyperglycemic, hyperlipidemic and hepatitis. The articles concerning management conditions of producing camel milk and its specific nutritive values were used for writing the manuscript and they were collected from google scholar, ScienceDirect, PubMed databases. The results indicated that camels species were significantly produced milk either under harsh or intensive management conditions. The constituents of chemical camel milk were differed among species, stage of lactation, and management systems. The nutritional values of camel milk were explored as antihyperglycemic, antihyperlipidemic, anti-cancer, and others. The possible biological candidates in camel milk include lactoglobulins, lactoferrin, and lysozyme. It could be concluded that camel milk has a potential nutritional therapy, where it is effected on blood glucose values, liver and kidney functions.

Friend or foe? Early life adversity to improve farmed animal welfare

Early life experiences can have lasting impacts on an animal’s development. Extensive research evidence aligns across both human and non-human rodent and primate laboratory animals showing negative impacts of early life adversity such as impairments in neurological and behavioural development. Farmed animals experience a range of adversities across their production lifetimes, often early in life, including species atypical social groupings, invasive husbandry procedures, and transport. Correspondingly, farmed animals also demonstrate a wide range of impairments such as stereotypic, injurious, and other abnormal behaviours. An individual, however, needs to experience adversity to be able to develop resilience and coping mechanisms that facilitate dealing with challenges later in life. Not all individuals will experience stress vulnerability following adversity, with some individuals instead developing stress resilience. This mini review collates evidence on the positive effects of early life adversity on improving adaptability in farmed species, both terrestrial and aquatic. While evidence across farmed animal species is currently much less than for humans, laboratory rodents or non-human primates, similar patterns emerge where mild adversity early in life, can improve the adaptability of the animal in the face of future stressors. Many views of optimised welfare posit that farmed animals should be housed in as natural environments as possible to limit many of the typical adversities they face. However, strategic mild exposure to early life adversity may facilitate improved animal welfare under intensive commercial farming conditions. Future research into this area could provide management tools to better predict and promote stress resilience over stress vulnerability.

A Systematic Review on Sex Differences in Prepulse Inhibition of Startle

Abstract: Prepulse inhibition of the startle response is defined as the inhibition of the startle reflex to an intense contextual stimulus (named pulse) when a weaker stimulus (named prepulse) precedes it and is considered a measure of sensorimotor gating. Consistent with recent research, it has been observed that this measure might exhibit sex differences in studies of both humans and rodents, although the results in the literature appear to be inconsistent. Therefore, this systematic review aims to analyze the sexual differences observed in human and nonhuman animal studies from a comparative perspective. A comprehensive search was conducted from the inception to the present in the Web of Science, PubMed, and PsycInfo databases. Following the search, 58 studies were included in the review. The average age in human studies ( n = 32) was 31.45 years (range = 4–69), while among nonhuman animal studies ( n = 26), the average age was 75.5 postnatal days (range = 7–360). The results indicated no clear sexual differences in the startle response magnitude. However, consistent sex differences in prepulse inhibition were found, revealing that males exhibited higher levels of sensorimotor gating compared to females in both humans (78.79% of the studies) and nonhuman animal studies (69.23% of the studies). Therefore, the findings corroborate the sex differences of prepulse inhibition and underscore the value of this paradigm in comparative science, emphasizing the importance of considering sex as an independent variable when studying this phenomenon.

Cassirer on language, objectivity, and truth

AbstractIn his transcendental approach, Cassirer argues that an objective world is not given and then simply copied by our cognitive faculties; rather, it is gained through the development of symbolic thought and perception. According to Cassirer, language plays a crucial role in this process of objectification. In this paper, the close relationship between language and symbolism in Cassirer’s philosophy will be delineated. This will also shed light on possible distinctions between human speech and animal communication. Furthermore, the relation of language to the different functions of consciousness and to the symbolic forms of myth and science will be addressed. Finally, based on the former considerations of language and objectification, Cassirer’s conceptions of reality and truth will be explicated and critically evaluated. It will be argued that his approach offers several interesting and promising insights but is nonetheless in danger of falling short in explaining the difference between artefacts and natural kinds.

Prone to loss: Senescence-regulated protein degradation leads to lower protein extractability in aging tomato leaves

The utilization of proteins extracted from tomato (Solanum lycopersicum) leaves as cost-effective resources for human consumption or animal feed has gained interest. Thus, increasing protein extractability from tomato leaves became a new breeding target. However, the genetic factors influencing this trait remains poorly understood. In this study, we analyzed changes in leaf protein content, protein composition, and extraction yield across developmental stages, which are vegetative growth, flowering, fruit-forming, and mature fruit. Moreover, tomato gene expression across developmental stages was also studied, to identify genes underlying variability in leaf protein extraction. Protein extraction yield decreased from 0.51 g/g to 0.01 g/g leaf protein from the vegetative to mature stage. However, total protein content inferred with Dumas combustion analysis did not change over the developmental stages tested, while the protein-to-peptide ratio decreased significantly. To further analyze potential causes underlying the decline of protein-to-peptide ratio, the enzymatic activity of proteases – i.e. the enzymes responsible for protein degradation – and the expression of genes encoding these enzymes was studied along plant development. The overall specific activity of proteases did not change significantly throughout plant development. On the contrary, the gene expression of distinct members of the aspartic, cysteine, and subtilase protease families increased. Overall, our findings suggest that extraplastidic protein degradation likely underlies the protein degradation observed during senescence. In the future, the reduction of the activity of extraplastidic proteases through biotechnology could represent an effective strategy to develop tomato varieties with improved protein extraction yields.

Feathers, folklore, and eco-literacy: Stories ascribe cultural keystone status to avian scavengers in South Asian cities

Abstract We examined the cultural significance of commensal avian scavenger species—vultures, kites, and crows—and their exploitation of anthropogenic resources and sentiments within Delhi’s urban landscapes. For this, we investigated the intrinsic values attributed to these birds by people, which are indicative of complex, rapidly urbanizing social-ecological systems. Semi-structured interviews revealed folk perceptions intertwined with socio-cultural narratives and traditions, shaped by observations of avian morphology, ecology, and behavior. Birds’ nesting habits, habitats, home ranges, and foraging behaviors affected people’s perceptions, while ecosystem services inspired zoomorphism and anthropomorphism via vernacular-nomenclature (e.g., chidiya collectively for songbirds, giddha for scavenging raptors). Culturally rooted perceptions, which informed ritual feeding practices and shaped prevalent attitudes towards commensal species, fostered mutual tolerance, and brought people into closer contact with urban biodiversity. Such physical and cultural proximity is a defining characteristic distinguishing tropical urban ecosystems from their Western counterparts. We also uncovered the web of social-technological influences on animal-related folk stories. The urbanization of perceptions in vulture extinction zones revealed shifts in social-ecological relationships with wildlife. It adds cultural dimensions to the currently appreciated keystone status of vultures, vital for their erstwhile coexistence at extremely high densities in South Asia. Urban transformations, technological advancements, and media exposure potentially reshaped human–animal interface, with media misinformation affecting personalized ecologies. Conflicts and health concerns arose from media narratives on garbage-consuming animals. Our findings offer insights to prevent severing of people and nature connections due to urbanization (e.g., technological applications can integrate scientific knowledge with biocultural narratives and folklore), promoting a new-age eco-literacy.

Impact of obesity on allergic respiratory diseases and on mental and cognitive performance

Summary Background Obesity and allergies are among the most common diseases of our civilization. Given the simultaneous rise in the prevalence of these diseases in recent years, a potential causal link between the two has been proposed. In particular, obese patients are at an increased risk of developing bronchial asthma, likely due to mechanical restrictions but also to metabolic changes that adversely affect immune function. Neuroscience studies have also shown that obesity can lead to impaired brain function and mental health. In the following review, we will take a closer look at our studies that focus on the influence of obesity on allergic diseases and cognitive performance. Results Both human studies and animal models (mice) have shown that obesity leads to increased allergic responses in the airways. Our studies in a mouse model of obesity confirm that an obese phenotype is associated with increased allergic sensitization and manifestation. These changes are associated with significant shifts in the composition of the gut microbial flora. The microbiome changes are further associated with allergic airway inflammation and an increased incidence of T helper 1 (Th1) type pulmonary macrophages. Interestingly, despite the changes in the microbiome, it is possible to effectively prevent allergy development by inducing oral tolerance. Furthermore, it was observed that obese mice show increased signs of anxiety and depression, as well as reduced cognitive performance. Conclusion Obesity is a complex metabolic disease that significantly impacts our body’s gut microbiome and immune system, resulting in an increased incidence of allergic asthma and neurological/psychological changes. Attention should be given to both the prophylactic and therapeutic measures to mitigate the impact of obesity, including oral tolerance for managing existing allergic diseases.

Mathematical Analysis of Four Fundamental Epidemiological Models for Monkeypox Disease Outbreaks: On the Pivotal Role of Human–Animal Order Parameters—In Memory of Hermann Haken

Four fundamental models that describe the spread of Monkeypox disease are analyzed: the SIR-SIR, SEIR-SIR, SIR-SEIR, and SEIR-SEIR models. They form the basis of most Monkeypox diseases models that are currently discussed in the literature. It is shown that the way the model subpopulations are organized in disease outbreaks and evolve relative to each other is determined by the relevant unstable system eigenvectors, also called order parameters. For all models, analytical expressions of the order parameters are derived. Under appropriate conditions these order parameters describe the initial outbreak phases of exponential increase in good approximation. It is shown that all four models exhibit maximally two order parameters and maximally one human–animal order parameter. The human–animal order parameter firmly connects the outbreak dynamics in the animal system with the dynamics in the human system. For the special case of the SIR-SIR model, it is found that the two possible order parameters completely describe the dynamics of infected humans and animals during entire infection waves. Finally, a simulation of a Monkeypox infection wave illustrates that in line with the aforementioned analytical results the leading order parameter explains most of the variance in the infection dynamics.

A Review on Nanotechnological Approaches for the Management of Stored Insect-Pests: Present Scenario and Future Prospects

Approximately 10% to 30% of the stored agricultural produce is damaged out of which 26% is due to insect-pest infestation thus seriously impacting the food security. The infestation also leads to loss of quality and thereby affecting the overall profitability. In absence of enough storage space, usually farmers dispose-off their produce immediately after harvest and thus do not get remunerative prices. For those opting for storage, physical and chemical methods are in vogue to manage the storage insect-pests. Fumigation with chemical pesticides such as methyl bromide and aluminium phosphide is a common method, though it has its own health and environmental risks. Inhalation of phosphine gas released when aluminium phosphide is used could seriously affect human animal health, sometimes leading to deaths. Thus for using these fumigants, strict supervision of government recognized experts is required. Due to their wide usage, some insect-pests have developed resistance against these molecules. Nanotechnology has created numerous new opportunities in agriculture and allied sectors. Insecticide formulations based on nanotechnology could be a viable alternative to toxic chemicals like aluminium phosphide to manage storage insect-pests. In recent years, a variety of formulations including solid nanopesticides, controlled-release formulations, nano-emulsions, and nano-suspensions have been developed possessing different modes of actions and applications. Their small size is a significant advantage because it provides higher insect-body surface area coverage and thus enhanced efficacy as compared to traditional pesticides. Aside from their small size, they are reported to be safe for non-target beneficial organisms. Nano-pesticides can thus prove as effective and eco-friendly alternatives for insect pest control in storage. However, there is a need to establish their safety on the human and animal ecosystems to rule out their ecological hazards over time. In absence of such information, nanopesticides will not be widely accepted despite their other beneficial effects. In this article, an effort is made to review the current status of nano-formulations for the management of storage-insect-pests, the research and extension gaps and ways to bridge the gaps to ensure safe use of the technology for efficient management of postharvest storage losses.