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Affiliation |
Faculty of Agriculture Department of Animal and Grassland Sciences |
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Title |
Assistant Professor |
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External Link |
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ANZAI Hiroki
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Degree 【 display / non-display 】
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博士（農学） ( 2016.3 京都大学 )
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修士（農学） ( 2013.3 京都大学 )
Research Areas 【 display / non-display 】
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Life Science / Animal production science
Papers 【 display / non-display 】
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Interindividual differences and their consistency in grazing cattle behavior across seasons Reviewed
Anzai H, Shitajikkoku M, Hani K, Yamada N, Hirata M.
Proceedings of the XXIV International Grassland Congress / XI International Rangeland Congress 2021.10
Authorship：Lead author, Corresponding author Language：English Publishing type：Research paper (international conference proceedings)
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Shift in management strategy of yak herding in the south of Mustang District, Nepal, Himalaya Reviewed International coauthorship
Anzai H, Shah MK, Kumagai H.
Proceedings of the XXIV International Grassland Congress / XI International Rangeland Congress 2021.10
Authorship：Lead author, Corresponding author Language：English Publishing type：Research paper (international conference proceedings)
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Development of an apparatus for evaluating the visual and olfactory discrimination ability of cattle under controlled target visibility. Reviewed
Hirata M, Kusatake N, Anzai H
Behavioural processes 104526 2021.9
Authorship：Last author Language：English Publishing type：Research paper (scientific journal)
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Anzai H., Hirata M.
Frontiers in Sustainable Food Systems 5 2021.9
Authorship：Lead author, Corresponding author Language：Japanese Publishing type：Research paper (scientific journal) Publisher：Frontiers in Sustainable Food Systems
To enhance productivity and welfare of individual animals maintained as a group, management based on individual behavioral tendencies is essential, which requires individual monitoring of animal behavior. Several behavior monitoring systems are currently available to livestock producers. The data obtained from these systems are analyzed to detect significantly high or low frequencies or intensities of behavior associated with estrus, calving and poor health conditions based on thresholds or past trends of the monitored individual. However, because behavior under grazing is more complex and changeable than under confinement, behavioral symptoms are more difficult to detect, and on-farm monitoring of individual animal behavior has been less validated and utilized in grazing systems. Nevertheless, individual monitoring of all animals in a herd is more feasible and cost-effective in small-scale intensive grazing systems because these systems pursue high productivity at the individual level with smaller herd size than large-scale extensive systems. Individually tailored management to enhance productivity and welfare will be possible by focusing on inter-individual differences in behavior within a herd. Behavior of an individual can be analyzed and understood in more detail by comparing it with those of the herd mates. Higher or lower levels of specific activities than the other animals can be associated with health disorders, temporal changes in physiological states, or productivity- or welfare-related traits. More sensitive monitoring and detection of behavioral responses of individuals to changes in nutritional, physical and social environments will lead to more efficient and welfare-conscious management that better meets the needs of individuals.
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Kitajima K., Oishi K., Miwa M., Anzai H., Setoguchi A., Yasunaka Y., Himeno Y., Kumagai H., Hirooka H.
Frontiers in Veterinary Science 8 658763 2021.6
Language：Japanese Publishing type：Research paper (scientific journal) Publisher：Frontiers in Veterinary Science
Heart rate variability (HRV) is the heart beat-to-beat variation under control of the cardiovascular function of animals. Under stressed conditions, cardiac activity is generally regulated with an upregulated sympathetic tone and withdrawal of vagal tone; thus, HRV monitoring can be a non-invasive technique to assess stress level in animals especially related to animal welfare. Among several stress-induced factors, heat stress is one of the most serious causes of physiological damage to animals. The aim of this study was to assess the effects of heat stress on HRV in small ruminants under free-moving conditions. In three experimental periods (June, August, and October), inter-beat intervals in sheep and goats (three for each) in two consecutive days were measured. HRV parameters were calculated from the inter-beat interval data by three types of analyses: time domain, frequency domain, and non-linear analyses. The temperature–humidity index (THI) was used as an indicator of heat stress, and vectorial dynamic body acceleration (VeDBA) was calculated to quantify the physical activity of the animals tested. First, we investigated correlations of THI and VeDBA with HRV parameters; subsequently, THI was divided into five categories according to the values obtained (≤ 65, 65–70, 70–75, 75–80, and >80), and the effects of the THI categories on HRV parameters were investigated with and without correcting for the effects of physical activity based on the VeDBA. The results indicated that HRV significantly decreased with increasing THI and VeDBA. For non-linear HRV parameters that were corrected for the effects of physical activity, it was suggested that there would be a threshold of THI around 80 that strongly affected HRV; high heat stress can affect the autonomic balance of animals non-linearly by inducing the sympathetic nervous system. In conclusion, to assess psychophysiological conditions of unrestrained animals by HRV analysis, the confounding effect of physical activity on HRV should be minimized for a more precise interpretation of the results.
Books 【 display / non-display 】
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石井 康之，大野 和朗 他（ Role： Joint author）
宮崎大学・令和２年度「飼料生産におけるツマジロクサヨトウ対策事業」事務局 2021.4
Language：Japanese
MISC 【 display / non-display 】
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九州における放牧酪農の現状と課題
宮嵜宥佳・安在弘樹
放牧通信 ( 17 ) 2021.7
Authorship：Last author, Corresponding author Language：Japanese Publishing type：Article, review, commentary, editorial, etc. (other)
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ネパールにおけるヤクの飼養 Invited
熊谷元，安在弘樹
農業 ( 1589 ) 60 - 64 2014.9
Language：Japanese Publishing type：Article, review, commentary, editorial, etc. (trade magazine, newspaper, online media) Publisher：大日本農会
Presentations 【 display / non-display 】
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放牧家畜の空間分布を遠隔制御する新たな技術の開発に関する予備研究：無人車両によるherdingに対するウシの行動反応とその制御性能
安在弘樹, 櫻井ひな
2022年度日本草地学会岩手大会 2022.3 日本草地学会
Event date： 2022.3
Language：Japanese Presentation type：Oral presentation (general)
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暑熱条件下の昼夜放牧におけるホルスタイン種乾乳牛の採食時間に及ぼす気象要因の影響
安在弘樹, 中岡恵大
日本畜産学会第128回大会 (九州大学) 日本畜産学会
Event date： 2021.3.28 - 2021.3.30
Language：Japanese Presentation type：Poster presentation
Venue：九州大学
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ウシの空間分布を考えるなら、草種の分布パターンも分けちゃいなよ！ Invited
安在弘樹
2021年度日本草地学会新潟大会
Event date： 2021.3.20 - 2021.3.26
Language：Japanese Presentation type：Symposium, workshop panel (nominated)
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黒毛和種繁殖牛群における昼間放牧中の行動時間割合の個体差：個体間一貫性および 生産関連指標との関係
安在弘樹，下拾石萌，羽仁勁太，山田奈苗，平田昌彦
2020年度日本草地学会静岡大会
Event date： 2020.3
Language：Japanese Presentation type：Oral presentation (general)
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小規模草地における放牧牛の空間分布：草地内環境の空間変動との関係
安在弘樹, 津田麻帆, 川並泉美, 平田昌彦
日本畜産学会第125回大会 (麻布大学) 日本畜産学会
Event date： 2019.3.28 - 2019.3.30
Language：Japanese Presentation type：Oral presentation (general)
Venue：麻布大学
Awards 【 display / non-display 】
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日本畜産学会奨励賞
2018.3 日本畜産学会 フィールド調査を軸としたアジアにおける家畜生産システムに関する研究
安在弘樹
Award type：Honored in official journal of a scientific society, scientific journal Country：Japan
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第49回国際応用動物行動学会大会 Student Poster Competition, The Best Presentation Award
2015.9 国際応用動物行動学会 Selectivity for rangeland characteristics by grazing yaks in Western Nepal, Himalaya
Anzai H
Award type：Award from international society, conference, symposium, etc. Country：Japan
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第16回AAAP大会プレゼンテーションアワード
2014.10 日本畜産学会 Use of GPS and GIS for estimating grazing pattern of yak in western Nepal, Himalaya
安在弘樹
Award type：Award from international society, conference, symposium, etc. Country：Japan