RESEARCH PAPER

Effects of Seasonal Grazing on Fatty Acid Composition in Forage, Yak Rumen Fluid and Milk Fat and Their Correlation Analysis

  • YAO Xixi ,
  • LIU Wen ,
  • XU Chengti ,
  • LIU Haodong
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  • 1. College of Agriculture and Animal Husbandry, Qinghai University, Xining 810016, China;
    2. Beijing Institute of Animal Husbandry and Veterinary Medicine, Chinese Academy of Agricultural Sciences, Beijing 100193, China;
    3. Academy of Animal Husbandry and Veterinary Sciences, Qinghai University, Xining 810016, China;
    4. Gansu Polytechnic College of Animal Husbandry & Engineering, Wuwei 733006, China

Received date: 2021-10-17

  Online published: 2022-05-14

Abstract

The purpose of this study was to investigate the effects of seasonal grazing on the composition of fatty acids in forage, yak rumen fluid and milk fat. Twenty Datong lactating yaks[body weight (251.5±10.5) kg] with calves were selected to graze for 9 months. The forage, rumen fluid and normal milk of grazing yaks in spring (April to June), summer (July to September) and winter (October to December) were collected, respectively. The composition and contents of fatty acids in forage, rumen fluid and milk fat were determined and analyzed. The results showed that the contents of crude protein, myristic acid, palmitic acid, c9-oleic acid, c9t11-conjugated linoleic acid, t10c12-conjugated linoleic acid, total conjugated linoleic acids and polyunsaturated fatty acids in forage in summer were significantly higher than those in spring and winter (P<0.05), and those in spring were significantly higher than those in winter (P<0.05). The contents of acetic acid, butyric acid, isobutyric acid, total volatile fatty acids, t11-oleic acid, c9t11-conjugated linoleic acid, t10c12-conjugated linoleic acid, total conjugated linoleic acids and polyunsaturated fatty acids in rumen fluid of grazing yaks in summer were significantly higher than those in spring and winter (P<0.05), and those in spring were significantly higher than those in winter (P<0.05). The contents of milk protein, milk fat, total milk solids, nonfat milk solids, lactose, casein and acidity in milk fat of grazing yaks in summer were significantly higher than those in spring and winter (P<0.05), but there were no significant differences between spring and winter (P>0.05). The contents of oleic acid, linoleic acid, c9t11-conjugated linoleic acid, t10c12-conjugated linoleic acid, total conjugated linoleic acids and polyunsaturated fatty acids in milk fat of grazing yaks in summer were significantly higher than those in spring and winter (P<0.05), and those in spring were significantly higher than those in winter (P<0.05). To sum up, the contents of total conjugated linoleic acid and unsaturated fatty acids in forage, rumen fluid and milk fat of grazing yak in summer are the highest and in winter are the lowest. It is suggested to graze in summer and reasonably supplement grazing Datong lactating yaks with calves in winter to ensure high-quality milk fat supply.

Cite this article

YAO Xixi , LIU Wen , XU Chengti , LIU Haodong . Effects of Seasonal Grazing on Fatty Acid Composition in Forage, Yak Rumen Fluid and Milk Fat and Their Correlation Analysis[J]. Chinese Journal of Animal Nutrition, 2022 , 34(5) : 3046 -3055 . DOI: 10.3969/j.issn.1006-267x.2022.05.033

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