高密度群飼が子牛の空間行動,社会行動および増体量に及ぼす影響〔英文〕

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Spatial and social behavior and weight gain under different density situations were compared in two groups of 6 castrated calves at 5 months of age. The one group was kept in a 14.4×28.8m lot (group LD, 69.1m2/calf), and the other was in a 3.0×9.0m indoor sloped floor pen (group HD, 4.7m2/calf). Each group was kept in that situation during 7 weeks, and behavior observations were made at the 3rd and 6th weeks for 7 consecutive days. During observations, lying behavior, distances between calves and agonistic behavior were recorded.Diurnal lying pattern did not differ from each group. Mean distance to nearest neighbor (rA) in group LD was significantly larger than that for group HD (P<0.01), while the ratio of rA to expected rA assuming random distribution at each density indicated that group LD had a tendency of aggregation (0.4-0.5), while calves in group HD showed random distribution (0.9-1.0). Agonistic encounters were observed less in group LD during the 3rd week than in group HD (295 vs. 580), though during the 6th week the rate of encounters was similar in each group (about 600 for each). Fighting in group LD comprised a greater proportion of the total enconters than in group HD, while bunting-pushing and threatening-avoiding comprised larger proportion in group HD than in group LD. Dominance rank orders were significantly correlated (P<0.01) between the 3rd and 6th weeks for group HD, but not for group LD. Mean body weight gains did not differ between two groups for the first 4 weeks (0.89 and 1.00kg/day for groups LD and HD), but calves kept at high density had significantly (P<0.05) lower body weight gains during from the 5th to 7th weeks, 1.22 and 0.89kg/day for groups LD and HD, respectively.
社団法人日本畜産学会の論文

高密度群飼が子牛の空間行動,社会行動および増体量に及ぼす影響〔英文〕

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