乳牛の生産飼料として大豆粕と甘藷葉の比較試驗
スポンサーリンク
概要
- 論文の詳細を見る
The present experiment was carried out to ascertain the feeding value of dried sweet potato leaves in comparison with soybean cake for milk production as protein source. Three Jersey cows and one grade Holstein cow were used to the trial for 100 days consisting of five periods, 20 days each (first ten days for transition, following ten days for experiment proper). To begin with soybean cake feeding, being followed by sweet potato leaves feeding, the two different ration periods were taken alternately and ended with fifth period of soybean cake feeding. The amounts of concentrates given were determined as 40% (by weight) in Jerseys and 25% (by weight) in Holstein of average daily milkyield in the previous period respectively.<BR>The results of the experiment are shown in the following tables (Table I, II.). Those figures shown as expected milk yields for 2nd and 4th periods in Table I were obtained by averaging actual yields of 1st and 3rd and of 3rd and 5th periods respectively, assuming that the milk yield decrease smoothly as lactation proceeds from 1st period (soybean cake) tp 3rd period (soybean cake) and from 3rd period to 5th period (soybean cake).<BR>Thus averaging the results of two series of traials (Table II) it has been shown that the actual milk production and butter fat production in sweet potato leaves feeding periods (2nd and 4th) decreased by 16.02% and 12.82% respectively in comparison with the expected production in case of soybean cake feeding. It, seems to be very reasonable to conclude that the above results are due to the lower content of digestible protein of the leaves fed than the analysis on which the feed computation based, owing to the late harvest of the leaves as well as considerable amount of leaf-stalk contained. The small increase in fat percentage in 2nd and 4th periods (Table I) seems to be simply the result of the decrease in the milk yields.
- 社団法人 日本畜産学会の論文