Dairy Farms In Japan Research Articles

Measurement of proviral load associated with the development of lymphocytosis in bovine leukaemia virus‐infected Holstein cattle at a dairy farm in Japan

AbstractWe monitored the bovine leukaemia virus (BLV) proviral load (PVL) in peripheral blood lymphocytes (PBLs) and the PBL counts in BLV‐infected cattle on a dairy farm in Japan to determine the changes in PVL with the progression of lymphocytosis. A total of 25 BLV‐infected Holstein cattle at a dairy farm were followed up from May 2015 (0 month) to April 2016 (11 months). PBL counts and PVL were measured three times in 25 cattle. Based on their PBL counts, five cattle with normal PBL (≤7500 cells/µL) at 0 month but high PBL (>7500 cells/µL) at 11 months were classified as the increased group. All cattle in the increased group showed increased PVL compared to asymptomatic aleukaemic carriers at 11 months. This study revealed increases in PVL with the progression of lymphocytosis, suggesting that cattle with progression of lymphocytosis should be segregated from BLV‐negative cattle as soon as possible.

Outbreaks of bovine mastitis caused by specific Mycoplasma bovis strains recurring at multi-year intervals.

Mycoplasma bovis is a major cause of bovine mastitis. Intermittent shedding of the organism for many months is a feature of cows with intramammary infection. A dairy farm in Japan experienced a mastitis outbreak caused by M. bovis in 2016, as well as 2 additional outbreaks and 1 case in 2020-2021. The causative strains in the 3 outbreaks shared a common and identical genetic feature, the insertion of a transposase gene at the same site within the phosphate acetyltransferase-2 gene. Additionally, all isolates were genotyped to closely related sequence types (ST21 and ST141) by multilocus sequence typing, and had similar pulsopatterns by pulsed-field gel electrophoresis. Our results indicate that infection with the same causative strain remained in this herd and environment for 4 y. Treatment with fluoroquinolones, guided by antimicrobial susceptibility test results, eliminated M. bovis from 16 of 20 M. bovis-infected cows, as confirmed by culture and somatic cell counts. However, mastitis caused by other bacteria occurred in 9 M. bovis-free cows within 2 mo of the last treatment.

Effects of parity, calving season, and previous lactation's milk yield on fertility of dairy cows on a commercial farm.

This study investigated the effects of parity, season, and the previous lactation's milk yield on fertility in dairy cows. A total of 5,514 calving records for Holstein cows that calved between 2016 and 2018 on a single large dairy farm in Japan were used for analysis. The proportion of cows that get pregnant by 360 days after calving was defined as the percentage of all cows eligible for breeding that became pregnant. In the all-cow model, pregnancy probability associated with both parity and calving season (p < 0.05). Pregnancy probability decreased with an increase in parity, with hazard ratios (HRs) of 1.75 (1.58-1.94) for parity 1, 1.25 (1.13-1.39) for parity 2, 1.15 (1.04-1.29) for parity 3, and 1.13 (1.00-1.27) for parity 4, relative to parity ≥5. In terms of calving season, the lowest pregnancy probability was found in spring, and the HRs relative to spring were 1.16 (1.07-1.26) for summer, 1.35 (1.24-1.47) for autumn, and 1.17 (1.07-1.27) for winter. In the multiparous-cow model, pregnancy probability associated with the previous lactation's milk yield (p < 0.05), but not with parity or calving season. Cows with high and middle previous milk yields had lower pregnancy probabilities than those with low milk yields.

Soil Fertility Management and Grassland Renovation on Dairy Farms in Japan: Regional Differences between Hokkaido and Other Prefectures

Soil Fertility Management and Grassland Renovation on Dairy Farms in Japan: Regional Differences between Hokkaido and Other Prefectures

Evaluating the antimicrobial use on dairy farms in Chiba Prefecture in Japan using the antimicrobial treatment incidence, an indicator based on Japanese defined daily doses from 2014-2016.

The use of antimicrobial agents in food-producing animals may lead to the emergence and spread of antimicrobial resistance in bacteria of animal origin. However, there is a paucity of data on the quantity of antimicrobials use on dairy farms in Japan. This study describes antimicrobial use on dairy farms from 1 January 2014 to 31 December 2016 in five administrative districts (central, eastern, western, southern and northern) of Chiba Prefecture. The use of antimicrobial agents in dairy cattle over these three years was evaluated in terms of the antimicrobial treatment incidence (ATI; theoretical number of animals per 1,000 animal-days subjected to antimicrobial treatment) using data collected from a total of 442 dairy farms in that prefecture. Our results revealed that the average ATI on these farms for these years ranged from 38.7 to 39.4 with no significant difference between years and that the average ATI for these administrative districts varied between 32.9 and 43.2 with a significant variation between some of the districts. Approximately 84% of antimicrobials were administered intramammarily, 13–14% by injection and 1–2% orally. Scenario analyses were performed to assess the effect of changes in some of the defined daily dose (DDDjp) values used to calculate the ATI. Our results revealed that the calculated ATI is considerably affected by the changes in the long-acting factor used for assigning the DDDjp values of intramammary products for dry cows and the way in which DDD values are assigned for combination products.

Phenotypic and genotypic characterization of Actinobacillus suis sensu stricto isolated from a dairy calf.

The species of the genus Actinobacillus have so far been associated with specific animal hosts, and A. suis sensu stricto, an opportunistic pathogen of swine, is rarely isolated from ruminants. We describe here the isolation of A. suis sensu stricto from a newborn calf that died on a dairy farm in Japan. Identification of the isolate was performed by phenotypic and genotypic characterization, with the latter consisting of nucleotide sequence analyses of the 16S rRNA gene plus three housekeeping genes, rpoB, infB and recN.

Analysing Dairy Farming in Japan through the TV Drama 'Natsuzora' (‘Summer Sky’)

As the global concern with animal welfare grows, the roles of animals in various cultural and historical settings need to be examined. This study analyses a popular Japanese TV show, Natsuzora (‘Summer Sky’), aired in 2019, that shows the life of a dairy farm in post-war Japan from the 1940s to the 1970s, when the consumption and production of meat and dairy gradually increased with technological development. This is contrasted with the present time, against the backdrop of the Tokyo Olympics 2020, and a rise in awareness regarding animal welfare. The study analyses of the story of Natsuzora and the different reactions towards it from the Ministry of Agriculture and the Animal Rights Center. It also scrutinises the social and historical background of the drama by referring to agricultural statistics from the 1940s to the present.

Effects of Theileria orientalis Infection on Health Status and Productivity of Dairy Cows Reared inside Barns.

The objective of the present study was to investigate the effects of Theileria orientalis on the severity of anemia, the prevalence of disease within 21 days after calving and productivity in cows raised inside barns. This longitudinal observational study, which was conducted on a commercial dairy farm in Japan, involved 627 Holstein cows subjected to PCR analysis for T. orientalis. In study 1, we collected blood samples from 156 sick cows within 21 days after calving, and we found the prevalence of T. orientalis infection to be 65.4%. In study 2, we randomly selected 471 cows during the dry period and collected blood samples to conduct PCR analysis for T. orientalis and determined the prevalence of T. orientalis infection to be 69.0%. Compared with the values for the T. orientalis-uninfected group, the T. orientalis-infected cows had significantly decreased hemoglobin concentrations and hematocrit, but there were no differences in the other complete blood count indexes between the two groups. In addition, there were no differences in productivity and the prevalence of major diseases between the T. orientalis-infected and uninfected cows. In summary, T. orientalis had few effects on anemia, productivity and the health of cows raised inside a barn.

Risk Assessment of Bovine Major Histocompatibility Complex Class II DRB3 Alleles for Perinatal Transmission of Bovine Leukemia Virus.

Perinatal transmission plays a critical role in the spread of bovine leukemia virus (BLV) infection in cattle herds. In the Holstein breed, we previously identified BLV resistant and susceptible bovine leukocyte antigen (BoLA)-DRB3 alleles, including BoLA-DRB3*009:02 and *014:01:01 with a low BLV proviral load (PVL), and *015:01 and *012:01 with a high PVL. Here, we evaluated the perinatal BLV transmission risk in dams with different BoLA-DRB3 alleles. BoLA-DRB3 alleles of 120 dam-calf pairs from five dairy farms in Japan were identified; their PVL was quantified using the BLV-Coordination of Common Motifs (CoCoMo)-qPCR-2 assay. Ninety-six dams were BLV-positive, and 29 gave birth to BLV-infected calves. Perinatal transmission frequency was 19% in dams with resistant alleles suppressed to a low PVL level, and 38% and 25% in dams with susceptible and neutral alleles that maintained high PVL levels, respectively. Notably, all calves with resistant alleles were BLV free, whereas 30% of calves with susceptible genes were infected. Thus, vertical transmission risk was extremely lower for dams and calves with resistant alleles compared to those with susceptible alleles. Our results can inform the development of effective BLV eradication programs under field conditions by providing necessary data to allow for optimal selection of dams for breeding.

Nitrogen balance and use efficiency on dairy farms in Japan: a comparison among farms at different scales

In recent decades, the rate of milk production per unit land area and per cow has increased with the intensification of the dairy system. The possible environmental risks arising from nutrients surpluses, such as nitrogen (N), are often evaluated using the N balance approach. In Hokkaido, the biggest dairy farming area in Japan, many dairy farms have started introducing a new dairy farming system called the total mixed ration (TMR) and biogas system. Feed and manure are managed at a community scale in these systems while each farm focuses primarily on milking cows. Thus, calculating the N balance for this system is complicated. Therefore, this study aimed to evaluate the N surplus and use efficiency (NUE), focusing mainly on the community-based dairy farming system, as described above. We investigated twenty dairy farms comprising a TMR centre (TMR-based farms) and nineteen conventional dairy farms (conventional farms). The Hokkaido dairy farms had a smaller N surplus and higher NUE than farms in other countries. The whole farm N surplus and NUE ranged from −163 to 701 kg N ha−1 and from 20% to 171% with median values of 40.5 kg N ha−1 and 69.5%, respectively. One of the possible reasons for the smaller N surplus and higher NUE is a lower stocking rate (averaged 1.3 cows ha−1) on Hokkaido dairy farms. There were strong relationships between feed N and N surplus because the studied dairy farms depended on purchased feed. In the comparison between the TMR centre and conventional dairy farms, the milk production level per cow and stocking rate tended to increase, and variations between farms decreased on the TMR-based farms. Increasing the amount of home-grown feed with pasture management is essential to decreasing N surplus for the new dairy farming systems.

High yield and nutritional quality of rice for animal feed achieved by continuous irrigation with treated municipal wastewater

Two consecutive pilot-scale experiments were conducted to investigate the potential reuse of treated municipal wastewater (TWW) as an irrigation source for cultivating forage rice (Oryza sativa L., cv. Bekoaoba) through examining our newly developed continuous irrigation systems, namely surface and subirrigation. Although only P-fertilizer was applied in 2016 and no fertilizer was supplemented in the 2017 season, the obtained yields were comparable to that recorded from normal paddy fields (7.3 t ha−1). The yields of the subirrigation plots (9.1 and 7.5 t ha−1) were significantly higher than those of the surface irrigation plots (7.5 and 7.1 t ha−1) in 2016 and 2017, respectively. There was no significant difference in the protein content of brown rice between the two fields, and this content (11.6–13%) was significantly higher than that (8.8%) recorded in normal paddy fields. This indicates our harvested rice was more favorable for animal husbandry since it can reduce the use of costly protein feed such as imported soymeal. Accumulation of heavy metals was not found in either paddy soil or brown rice after the two experiments. An effective N removal efficiency of the examined irrigation systems along with the reduced usage of chemical fertilizers could contribute to a substantial decrease in nutrients discharged from the wastewater treatment plants into surface water bodies. This study conveys the high feasibility of continuous irrigation with TWW to achieve high production and good nutritional quality of rice for animal feeding, which could promote an effective reuse of TWW in forage rice cultivation and enhance the self-sufficient feed ratio for sustainable dairy farming in Japan.

Assessment and clarification of animal welfare improvements in small housing dairy farms in Japan

Assessment and clarification of animal welfare improvements in small housing dairy farms in Japan

Associations of the first occurrence of pathogen-specific clinical mastitis with milk yield and milk composition in dairy cows.

The aim of this study was to estimate the associations of the first occurrence of pathogen-specific clinical mastitis (CM) with milk yield and milk composition (somatic cell count (SCC), lactose, fat, protein content in milk and milk urea nitrogen (MUN)). We studied 3149 dairy cows in 31 Hokkaido dairy farms in Japan. Five pathogen groups were studied: Streptococcus spp.; Staphylococcus aureus (S. aureus); coagulase-negative staphylococci (CNS); coliforms; and fungi. Test-day milk data and clinical records were collected from June 2011 until February 2014. Mixed models with an autoregressive correlation structure were fitted to quantify the effects of CM and several other control variables (herd, calving season, parity, week of lactation, and other diseases). Primipara (first lactation) and multipara (second and later lactations) were analysed separately. All pathogens, particularly S. aureus and fungi, were associated with significant milk losses in multipara. In this study, S. aureus and CNS infections were not associated with significant milk loss in primipara. All pathogens, in particular S. aureus and fungi, significantly increased SCC in both parity groups. All pathogens, especially CNS (in primipara) and S. aureus (in multipara), decreased lactose content. All pathogen groups except for fungi were associated with significant changes in fat, protein and MUN. Some pathogens such as Streptococcus spp. and coliforms seemed to be associated with long-term fat, protein and MUN changes. These findings provide estimates that could be used to calculate precise costs of CM, and also provide better indicators of pathogen-specific mastitis.

Assessing Managerial Efficiency of Educational Tourism in Agriculture: Case of Dairy Farms in Japan

Many rural areas face difficulty in how to motivate farmers to embark on diversified activities, such as tourism, while raising managerial efficiency. Thus, this paper conceptually and empirically evaluated how a farmer’s identity correlates with managerial efficiency since the connection between the two has not been explored fully. We have addressed this issue through examining farmers’ efforts in providing an emerging new educational tourism service by focusing on the Educational Dairy Farms in Japan. Conceptually, this paper classified farmers’ identity into two types: traditional identity as a simple farm producer offering an educational service as a volunteer, and, enlarged identity, which is oriented toward viability of a new service activity. Empirically, data envelopment analysis revealed that those with the enlarged identity realized a higher managerial efficiency although there was much room for improvement in overall managerial efficiency. Consequently, support measures with a wider perspective that include identity issues should be designed for capacity building of farmers who are conducting tourism.

Educational tourism in agriculture and identity of farm successors

Although farm visiting is gaining popularity as a type of experience-oriented tourism, the economic viability of this emerging service has not been fully established. To make it viable, it is not enough to approach educational tourism solely from a technical viewpoint, we also need to approach it from the aspect of the operator’s identity, a factor that has not been addressed fully in the arena of either rural tourism or tourism economics. Thus, by presenting a conceptual economic framework that explains the connection between a farmer’s identity and the level of diversified activity including tourism, this article has evaluated, based on a questionnaire survey of next-generation successors working on-farm at Educational Dairy Farms in Japan, the hypothesis that those farmers who have enlarged their identity will be able to successfully develop diversified activities. The results clarify factors that lead to enlarged identity, including formation of both a wider perspective and more extensive human networks from social learning opportunities, and female initiative within the activity. In this context, the issue of identity formation should be properly positioned in the field of innovation-oriented capability building of farm management.

A New Strategy for Utilizing Rice Forage Production Using a No-Tillage System to Enhance the Self-Sufficient Feed Ratio of Small Scale Dairy Farming in Japan

Rice forage systems can increase the land use efficiency in paddy fields, improve the self-sufficient feed ratio, and provide environmental benefits for agro-ecosystems. This system often decreased economic benefits compared with those through imported commercial forage feed, particularly in Japan. We observed the productivities of winter forage after rice harvest between conventional tillage (CT) and no-tillage (NT) in a field experiment. An on-farm evaluation was performed to determine the self-sufficient ratio of feed and forage production costs based on farm evaluation of the dairy farmer and the rice grower, who adopted a rice forage system. The field experiment detected no significant difference in forage production and quality between CT and NT after rice harvest. However, the production cost was dramatically decreased by 28.1% in NT compared with CT. The self-sufficient ratio was 5.4% higher when dairy farmers adopted the rice forage system compared with those using the current management system. Therefore, this study demonstrated the positive benefits for dairy farmers and rice growers in Japan when adopting a rice forage system with NT, which could improve the self-sufficient feed ratio and reduce production costs.

Becoming bovine: Mechanics and metamorphosis in Hokkaido's animal-human-machine

The fieldwork for my doctoral degree was carried out over nineteen months, a year of which was spent working on an industrial dairy farm in Hokkaido, Japan's northernmost Island. As in much of the industrialised world, dairy farming in Japan is rapidly changing. Many farmers are forced by neo-liberal agricultural policies to shift from small family operated farms to high-tech, high-speed, and high overhead industrial operations. This paper focuses on the history of dairy farming in the Tokachi region; more specifically one farm and the shift over a generation to a rotary parlour milking system. It addresses the linkages this mode of production has cultivated amongst humans, dairy cows and industrialized space.The parlour system at Great Hopes Farm allows five workers (aided by three more stall staff) to milk over 1000 cows, fifty at a time, three times a day. The impetus behind moving to parlour technology is that it increases productivity through mechanically enhanced observation and control. However this recent mechanical separation of human and cow during the milking process has led to affectively shared interspecies and inter-human alienation. The technology of the parlour system sets daily rhythms for bovine and human alike, and separates both from a process formerly dependent upon, specialized knowledge, affective empathy, and embodied knowledge. Human and bovine experience the systemic violence of the machine and what remains is a complex bio-politics of interspecies affect and the separation of “bare” and “political” life.

酪農経営における飼養管理意識に関する分析

Like other developed countries, dairy farms in Japan also have expanded their production size and productivity of milk yield, rapidly. However, such an expansion has brought serious problems worsening environmental conditions, dependence on purchased feed and so on. Thus it is necessary to improve the management keeping the purpose of expanding size and productivity of milk yield.This study is to clarify the relationship between dairy farmers’ consciousness of management and results of herd performance tests (hereafter, HPT). For this study, the data of consciousness of farm management was collected by interviews of 30 dairy farms in Tokushima Prefecture that have records of HPT every month last year, 2009,done by the Prefectural Dairy Farm Association. This study introduced the AHP (Analysis Hierarchy Process) and Cluster analysis methods. The results of analysis show: 1) the highest priority in the consciousness of management is to prolong the herd-life and then to stabilize the quality of milk; 2) the lowest priority is to introduce dairy cattle from outside the prefecture; and 3) there is a significant gap between the dairy farmers’consciousness of management and the results of HPTs.

Evaluating Operators' Attitudes to Educational Tourism in Dairy Farms: The Case of Japan

Although the educational function is attracting growing attention as a kind of multifunctionality in agriculture, educational services are not yet provided as a viable farm product. With regard to establishing a viable market for this service, this paper explores how the educational externality could be internalized by focusing on educational dairy farms in Japan. The author evaluates quantitatively the attitudes of operators towards establishing a viable service, as revealed by a questionnaire survey. First, a conceptual framework was devised to express their orientation towards an economically viable service by incorporating a stepwise internalization process of positive externalities with the help of a social learning network. Then, empirically, statistical tests were conducted and factors that determined this orientation, a viable service determinant function, were explored by means of the ordered logit model. The results show that, first, the higher the number of visitors to the farm the more operators are oriented towards a viable service, while no connection with ordinary dairy production is demonstrated. Second, social learning is effective for initiating the internalization process. Third, marketing skills become more important for upgrading the internalization level. Consequently, it is important to create opportunities for those farmers who want to provide consumers with educational services to learn a new role for agriculture and to establish a new income source.

Prevalence of Mycoplasma species in bulk tank milk in Japan

Mycoplasma species are highly contagious pathogens and their ability to cause intramammary infection is a serious problem on dairy farms (Nicholas and Ayling 2003). Since the cure rate of clinical...