在有机冬季日粮中提高牛奶脂肪酸组成的实验研究。

Experimental improvement of cow milk fatty acid composition in organic winter diets.

机构信息

Department for Biodynamic Agriculture, University of Kassel, 37213 Witzenhausen, Germany.

出版信息

J Sci Food Agric. 2012 Nov;92(14):2883-90. doi: 10.1002/jsfa.5525. Epub 2011 Dec 16.

DOI:10.1002/jsfa.5525

PMID:22173628

Abstract

BACKGROUND

Organic milk is seen as more healthy in terms of its fatty acid (FA) profile. In three on-farm crossover trials with 10-12 cows in each group, different forages were compared for their potential to improve the FA composition. Different hay qualities (hay of pasture vs. hay of leys), additional energy sources (fodder beets vs. wheat) and roughage qualities (hay of pasture vs. grass silage) were compared for their effect on the FA composition of the milk.

RESULTS

Rumenic acid (CLA cis-9, trans-11) and α-linolenic acid (ALA) were selected as principal markers to evaluate effects. The overall CLA cis-9, trans-11 was low (3.6-6.3 g kg⁻¹ fat), whereas ALA levels were intermediate (6.8-9.4 g kg⁻¹ fat). Differences between the forages were explained by the fat metabolism of the ruminants.

CONCLUSION

Organic winter milk is low in several desirable FAs. Diets rich in mature fodder and sugar were a poor choice for an improved FA composition.

摘要

背景

有机牛奶在脂肪酸 (FA) 组成方面被认为更健康。在三个有 10-12 头奶牛参与的农场交叉试验中，比较了不同的饲草对改善 FA 组成的潜力。比较了不同干草质量（牧草干草与草地干草）、额外的能量来源（饲料甜菜与小麦）和粗饲料质量（牧草干草与草青贮）对牛奶 FA 组成的影响。

结果

反式亚油酸（CLA cis-9, trans-11）和α-亚麻酸 (ALA) 被选为评估效果的主要标志物。总体 CLA cis-9, trans-11 水平较低（3.6-6.3 g kg⁻¹ 脂肪），而 ALA 水平中等（6.8-9.4 g kg⁻¹ 脂肪）。饲草之间的差异可以通过反刍动物的脂肪代谢来解释。