Effect of bypass fat on milk lipid quality and reproductive efficiency of dairy cows

Lesvy Ramos, J. Apráez, D. David, J. F. Navia
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Abstract

Nariño (Colombia) has high dairy potential; however, their herds present difficulties in the nutritional component (energy imbalance) of the cows, affecting their productivity. This research evaluated the effect of a bypass fat supplement on lipid concentration in milk and the reproductive efficiency of dairy cows. The study was based on 21 Holstein x Simmental cows between first and third calving and the following was supplied: forage + concentrate (T1); forage + concentrate + 250 g/day of bypass fat (T2) and forage + concentrate + 250 g/day of bypass fat enriched with omega-three (T3). The experiment was conducted from day 15 pre-calving until day 105 of lactation. During this period, milk quantity, quality, composition, and reproductive behavior were recorded. For data analysis, a repeated measure mixed design with time-series data was used, where the fixed effects were the treatments, periods, and their interaction, the animals represented the random effect, and the covariable was the estimated milk yield during lactation. The results showed normal mobilization of adipose tissue; the compositional quality of the milk did not vary across treatments, although T2 presented a higher estimated production per lactation, and T3 presented a higher percentage of fatty acid C18:2. In the reproductive indicators, they were not influenced between the treatments; concluding that the base diet offered in the herd presents a nutritional balance appropriate to the requirements of the cows in production.
旁路脂肪对奶牛脂质和繁殖效率的影响
Nariño(哥伦比亚)乳品潜力巨大;然而,他们的牛群在奶牛的营养成分(能量失衡)方面存在困难,影响了它们的生产力。本研究评价了旁路脂肪添加对奶牛乳中脂质浓度和繁殖效率的影响。本试验选用21头产犊1 ~ 3胎的荷斯坦×西蒙塔尔奶牛,饲喂饲料+精料(T1);草料+浓缩料+ 250 g/天的旁路脂肪(T2)和草料+浓缩料+ 250 g/天富含- 3的旁路脂肪(T3)。试验时间为预产犊第15天至泌乳第105天。在此期间,记录了产奶量、质量、成分和繁殖行为。对于数据分析,采用时间序列数据的重复测量混合设计,其中固定效应为治疗、周期及其相互作用,动物代表随机效应,协变量为哺乳期估计产奶量。结果显示:脂肪组织活动正常;尽管T2组每次泌乳的估计产量更高,而T3组的脂肪酸C18:2的百分比更高,但不同处理的乳成分质量没有变化。在生殖指标方面,各处理间无显著差异;综上所述,畜群提供的基础日粮营养平衡,适合奶牛生产需要。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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