牛の分娩前徴--起立回数および起立時間の変化

概要

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The present study was undertaken to determine whether the changes in times standing-up and standing time during the preparturient period in cows could be utilized for the estimation of the onset time of parturition. Twelve Holstein cows held on public farms in Osaka Prefecture were used.Inspection was made on 30(±5)and 15(±3) days before the estimate time of parturition and every day from 7 days before to the day of term. The activities per day increased along with the progress of pregnancy. The maximum values were observed on days 0-1 before parturition. In particular, the changes in the nocturnal activities were larger than those in the diurnal. A significant change (P<0.05) in the nocturnal activities was observed between days 1 and 3 before the parturition. The maximum values in the nocturnal activities were as follows :the number of times standing-up and length of time standing averaged 9 per 12hr, and 6 hours and 32 min per 12hr, respectively.
社団法人日本畜産学会の論文