Effects of Supplemental Fish Meal on Milk Yield and Blood Components of Early Lactating Dairy Cows Fed Grass Silage-based Diets.

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  • 牧草サイレージ主体飼養における泌乳初期牛の乳生産および血液成分に及ぼす魚粉給与の影響
  • ボクソウ サイレージ シュタイ シヨウ ニ オケル ヒツニュウ ショキギュウ ノ ニュウセイサン オヨビ ケツエキ セイブン ニ オヨボス ギョフン キュウヨ ノ エイキョウ

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The experiment was carried out to investigate the effects of fish meal supplementation on milk yield, milk composition, and blood components of early lactating dairy cows fed the diet based on grass silage. Twenty six multiparous cows were randomly fed one of the two diets as total mixed rations (TMR) from 6th day to twelve weeks after parturition. The TMR consisted of grass silage, flaked corn, soybean meal and fish meal at a ratio of 50 : 38 : 12 : 0, or 50 : 39 : 6 : 5 on a DM basis, respectively. TMRs were isonitrogenous (16% CP) and isocaloric (77% TDN). DM intake and milk yields were not affected by the treatment (20.1 vs. 20.7kg/d, and 37.6 vs. 38.6kg/d, respectively). However, fish meal supplementation increased milk protein yield and contents (1.07 vs. 1.17kg/d, and 2.86 vs. 3.04 ; P<0.07 and P<0.05, respectively). Supplementation of fish meal increased serum concentrations of Met and Lysine (2.15 vs. 2.43μmol/dl, 7.66 vs. 8.90μmol/dl, P<0.05 and P<0.01, respectively). These results indicate that fish meal supplied amino acid limiting for milk protein synthesis, and increased milk protein contents when cows were fed grass silage-based diets.

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