商业奶牛群中饲喂膨化亚麻籽奶牛的泌乳性能

A. Beauregard, M.-P. Dallaire, R. Gervais, P.Y. Chouinard
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引用次数: 1

摘要

目前农场试验的目的是评估喂养挤压亚麻籽对牛奶产量和成分的影响。招募了位于加拿大魁北克省的30个商业奶牛群。实验开始于2个月的基线期,在此期间,每头牛都接受常规饮食。在此期间收集的数据被用作协变量。农场随后被随机分配到对照组(n=15;767头牛),其继续接受常规饮食,或在7个月的实验期内接受补充有挤压亚麻籽(每头牛0.7kg/d)的饮食的治疗组(n=15,863头牛)。显著性在P≤0.05时被宣布,并且在0.05<;P≤0.10。饲喂膨化亚麻籽不会影响采食量,但每头牛的产奶量增加了1.1kg/d,饲料效率提高了6.5%。日粮中添加膨化亚麻籽可增加乳脂(趋势)和乳糖产量,而不同处理之间的乳蛋白产量相似。在接受挤压亚麻籽的畜群中,估计的CH4强度降低了1.3 g/L牛奶(−9.2%)。喂食挤压亚麻籽可增加顺式-9、顺式-12、顺式-15 18:3和总n-3脂肪酸的乳脂浓度。目前的农场试验结果证实了在实验条件下的观察结果,即喂食适度水平的挤压亚麻籽可以提高奶牛的生产性能。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Lactational performance of cows fed extruded flaxseed in commercial dairy herds

The objective of the current on-farm trial was to assess the impact of feeding extruded flaxseed on milk yield and composition. Thirty commercial dairy herds located in the province of Québec, Canada were recruited. The experiment began with a baseline period of 2 months during which each cow received their regular diets. Data collected during this period were used as covariate. Farms were then randomly allocated into a control group (n = 15; 767 cows) which continued to receive their regular diets, or a treatment group (n = 15; 863 cows) which received diets supplemented with extruded flaxseed (0.7 kg/d per cow) during an experimental period of 7 months. Significance was declared at P ≤ 0.05 and tendencies at 0.05 < P ≤ 0.10. Feeding extruded flaxseed did not affect feed intake but increased milk yield by 1.1 kg/d per cow, and feed efficiency by 6.5%. Dietary addition of extruded flaxseed increased milk fat (tendency) and lactose yield, whereas milk protein yield was similar between treatments. Estimated CH4 intensity were reduced by 1.3 g/L of milk (−9.2%) in herds receiving extruded flaxseed. Feeding extruded flaxseed increased milk fat concentration of cis-9, cis-12, cis-15 18:3 and total n-3 fatty acids. Results of the current on-farm trial confirm observations made under experimental conditions that feeding moderate levels of extruded flaxseed improves production performance in dairy cows.

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