放牧牛の発育およびその阻害要因に関する考察
スポンサーリンク
概要
- 論文の詳細を見る
We have been investigating about raising on pasture and environmental factors affecting the growth of the Holstein heifers during pasturing from 1965 to 1972. The following results were obtained, 1) The growth pattern of raising heifers on Satomi pasture was characteristic, their bodyweight gains did not increase greatly from June to July but increased after this period. Investigation of the data from 1969 to 1971 showed that the average daily gain was only 0.34kg during pasturing. 2) Considerable damage of piroplasmosis (13.0 to 36.4% of all) took place in the graizing heifer. 3) The best way to keep off the danger of piroplasmosis was to inject a new vaccine to the heifer, the vaccination was done on 70th day before grazing. 4) We obtained the new vaccine from National Institute of Animal Health. This new vaccine has always consisted of bovine blood known or believed to be infected with Babesia sp. and Theileria sergenti. The vaccine containing Babesis sp. and Theileria sergenti was more effective than the vaccine for Theileria sergenti only on Satomi pasture. 5) The percentage of albumin fraction tended to decrease clearly at the early stage of the grazing, and then increase gradually or continue constantly until the end of the grazing. The percentage of γ-globulin fraction tended to increase gradually during grazing, 6) Trace elements of the Satomi pasture, quantities of Cu and Fe were normal. 7) We must pay attention to other factors affecting the raising of grazing heifers, however, the daily gain of their body-weight was promoted a little by a new vaccination.
- 社団法人 日本畜産学会の論文