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首页> 外文期刊>Journal of dairy research >Effects of full-time v. part-time grazing on seasonal changes in milk coagulation properties and fatty acid composition
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Effects of full-time v. part-time grazing on seasonal changes in milk coagulation properties and fatty acid composition

机译：全时Ⅴ的影响。兼职放牧对牛奶凝固性能和脂肪酸组成的季节变化

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摘要

For this research communication our objective was to investigate to what extent milk coagu-lation properties and milk fatty acid (FA) composition were affected by different feeding sys-tems, season and their interaction. Eighteen cows in total were subjected to one of three different feeding system treatments: full-time grazing or part-time grazing combined with indoor feeding of fresh grass with low or high concentrate supplementation. Milk was sampled in spring, summer and autumn. Milk coagulation time was 15.0, 19.0 and 17.7 min, coagula-tion dynamics 1.67, 3.41 and 1.79 min, and curd firmness 52.7, 32.4 and 47.0 mm in spring, summer and autumn, respectively. Thus, milk coagulation properties of the milk were lower during summer. There were strong seasonal effects on milk FA proportions, but there were not always changes with progressing season, or changes were different with respect to the impact of the feeding systems (system x season interaction). The milk fat was favourably rich in oleic acid, conjugated linoleic acid and α-linolenic acid and had a low n-6/n-3 fatty acid ratio in all systems. Factors like seasonal variations in grass composition and the energy balance of the cows were considered relevant for the milk FA composition. Overall, seasonal variations in milk quality were less pronounced with part-time grazing with fresh grass indoors as com-pared to full-time grazing without concentrate.
机译：对于这项研究，我们的目的是调查牛奶凝血性质和乳脂肪酸（Fa）组合物的程度，受不同的饲养系统，季节及其相互作用的影响。总共十八奶牛的涉及三种不同的饲养系统治疗之一：全职放牧或兼职放牧结合室内喂养新鲜草，低浓度补充。牛奶在春天，夏天和秋天被抽样。牛奶凝固时间为15.0,19.0和17.7分钟，凝固动态1.67,3.41和1.79分钟，春季，夏季和秋季分别凝固52.7,32.4和47.0毫米。因此，夏季牛奶的牛奶凝固性质较低。对牛奶FA比例有很强的季节性影响，但随着进展季节并不总是变化，或者对饲养系统的影响（系统X季节相互作用）的变化不同。乳脂有利地富含油酸，缀合的亚油酸和α-亚麻酸，并在所有系统中具有低N-6 / N-3脂肪酸比。对草组成的季节变化和奶牛的能量平衡等因素被认为是对牛奶FA组成相关的。总体而言，牛奶质量的季节性变化不太明显，兼职在室内用新鲜的草地放牧，因为在没有专注的情况下为全职放牧。

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  • 来源
    《Journal of dairy research》 |2021年第1期|23-28|共6页
  • 作者

    Franziska S. Akert; Michael Kreuzer; Carmen Kunz; Beat Reidy; Joel Berard;

  • 作者单位

    ETH Zurich Institute of Agricultural Sciences Universitaetstrasse 2 8092 Zurich Switzerland HAFL Zollikofen University of Applied Sciences Bern BFH Langgasse 85 3052 Zollikofen Switzerland;

    ETH Zurich Institute of Agricultural Sciences Universitaetstrasse 2 8092 Zurich Switzerland;

    ETH Zurich Institute of Agricultural Sciences Universitaetstrasse 2 8092 Zurich Switzerland;

    HAFL Zollikofen University of Applied Sciences Bern BFH Langgasse 85 3052 Zollikofen Switzerland;

    Agroscope Animal Production Systems Rte de la Tioleyre 4 1725 Posieux Switzerland;

  • 收录信息 美国《科学引文索引》(SCI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Concentrate supplementation; dairy; fatty acid composition; grazing; milk coagulation properties;

    机译：浓缩补充;乳房;脂肪酸组成;放牧;牛奶凝固性质;

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