Effects of Feeding Level on Milk Yield, Milk Compositions and Blood Constituents in Japanese Black Cows

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  • 黒毛和種における分娩後の配合飼料給与水準の違いが乳量および乳成分に及ぼす影響
  • 黒毛和種における分娩後の配合飼料給与水凖の違いが乳量および乳成分に及ぼす影響
  • クロゲ ワシュ ニ オケル ブンベンゴ ノ ハイゴウ シリョウ キュウヨ スイジュン ノ チガイ ガ ニュウリョウ オヨビ ニュウセイブン ニ オヨボス エイキョウ

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Abstract

The effects of feeding level on milk yield, milk compositions and blood constituents in Japanese Black cows were investigated. Eighteen Japanese Black cows were used in this experiment. According to energy supplying level, cows were grouped into three treatments : L (n=4), maintenance ; M (n=7), maintenance plus level of 7kg milk production ; and H (n=7), maintenance plus level of 14kg milk production. The proportion of forage in the diet was 87.6, 64.1, 47.5% in L, M and H cows, respectively. Milk yield, milk compositions and blood constituents were measured once a week until 4 weeks after calving. Mean daily milk yield was 5.1, 5.4 and 6.7kg, and milk protein was 3.55, 3.75 and 3.84% in the L, M and H cows, respectively. These increased linearly with an increased feeding level (P<0.01). The M cows had 6.03% milk fat. This value was significantly higher (P<0.05) than that in the L cows (5.57%) and the H cows (5.10%). Lactose and solid not fat were not influenced by the feeding level. Serum urea nitrogen linearly increased (P<0.01) and plasma glucose significantly decreased (P<0.05) with the increasing feeding level. The fluctuation of serum nonesterified fatty acids and serum total cholesterol was different among the treatments. These results indicate that increasing energy feeding level increases milk yield, and the proportion of forage in the diet influences milk compositions.

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