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首页> 美国卫生研究院文献>Journal of Animal Science >WPSI-8 Biosynthesis of milk components and vitality of cows with high and low-fat milk.
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WPSI-8 Biosynthesis of milk components and vitality of cows with high and low-fat milk.

机译：WPSI-8高脂和低脂奶牛的牛奶成分和生命力的生物合成。

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When feeding single-type diets to cows, differences in digestion associated with different feed intake rates, masticatory activity and rate of outflow of feed particles from the rumen, and different volumes of absorption of the end products of digestion can be observed. The study of these aspects is important for explaining the differences in the composition of milk of cows with different fat and protein beet and the development of ways to manage the biosynthesis of milk components. The aim of the research was to study the characteristics of nutrition, metabolism and biosynthesis of milk components in highly productive dairy cows with normal and low milk fat levels and the timing of their economic use. The trials were performed on multiparous cows of Holstein breed on the 80 day of lactation on this different milk fat and milk production 39.7 ± 0.75 kg (4.1 ± 0.24% of milk fat in сows with high (n=10) and 2.8 ± 0,13 with low fat content of milk (n=10)). The materials obtained in the experiment was biometrically processed using the ANOVA method. Study the characteristics of fermentation of scar formation substrates and their use in energy metabolism and biosynthesis of the milk components. Found that low fat milk is not associated with a lack of formation of acetate in the rumen (6.1 vs. 6.6 mmol/dl in the contents of the rumen, р>0.05) and the change in the hormonal profile, but depends on the reduction of fatty acids synthesis de novo in mammary gland, regulated by conjugated higher fatty acids. The result is a reduction in the need of cows in the exchange energy (reduction of heat transfer by 6.2 MJ), a shorter service period (109.5 vs.139 days) and the prolongation of their productive use (the number of lactations correlated back with the level of fat in milk (r=-0.68, p<0.05, n=1300).
机译：当向母牛饲喂单一类型的日粮时，可以观察到消化率的差异，这与不同的采食率，咀嚼活性和瘤胃中的饲料颗粒流出率以及消化终产物吸收量的不同有关。这些方面的研究对于解释具有不同脂肪和蛋白质甜菜的母牛的牛奶成分的差异以及开发管理牛奶成分生物合成方法的方法非常重要。该研究的目的是研究高脂肪奶水平和低脂肪水平的高产奶牛的乳成分的营养，代谢和生物合成特性，以及其经济使用时机。该试验是在哺乳期80天对荷斯坦奶牛的多头奶牛进行的，这些牛的脂肪和产奶量分别为39.7±0.75公斤（高（n = 10）和2.8±0的牛群中的4.1±0.24％， 13牛奶中的脂肪含量低（n = 10）。实验中获得的材料使用ANOVA方法进行生物特征处理。研究疤痕形成基质的发酵特性及其在牛奶成分的能量代谢和生物合成中的用途。发现低脂牛奶与瘤胃中乙酸盐缺乏形成无关（瘤胃内容物含量分别为6.1和6.6 mmol / dl，р> 0.05）和激素分布的变化，但取决于减少量共轭高级脂肪酸调节的乳腺中脂肪酸从头合成的过程结果是减少了母牛的交换能量需求（减少了6.2 MJ的热传递），更短的使用时间（109.5对139天）以及生产使用时间的延长（泌乳次数与牛奶中的脂肪含量（r = -0.68，p <0.05，n = 1300）。

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