RESEARCH PAPER

Effects of Diets with Different Concentrate to Roughage Ratios on Growth Performance, Nutrient Apparent Digestibilities, Serum Biochemical Indexes and Rumen Fermentation Parameters of Yak in Late Stage of Fattening

  • LI Yan ,
  • DAI Dongwen ,
  • YANG Yingkui ,
  • WANG Xun ,
  • LIU Shujie ,
  • HONG Wei ,
  • CHAI Shatuo ,
  • WANG Shuxiang
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  • 1. Qinghai Academy of Animal Husbandry and Veterinary Sciences, Qinghai University, Xining 810016, China;
    2. Key Laboratory of Plateau Grazing Animal Nutrition and Feed Science of Qinghai Province, Xining 810016, China;
    3. Yak Engineering Technology Research Centre of Qinghai Province, Xining 810016, China;
    4. Ecological Animal Husbandry Professional Cooperative of Tuanjie Village, Xibusha Township, Zeku County, Zeku 811400, China

Received date: 2021-10-10

  Online published: 2022-05-14

Abstract

This experiment was conducted to investigate the effects of diets with different concentrate to roughage ratios on growth performance, nutrient apparent digestibilities, serum biochemical indexes and rumen fermentation parameters of yak in late stage of fattening. Thirty-six healthy male yaks in late stage of fattening with similar body weight[(246.43±14.85) kg] were selected and randomly divided into 3 groups with 12 yak in each group. Yak in 3 groups were fed experimental diets which the concentrate to roughage ratios were 65:35, 70:30 and 75:25, respectively, as group C65, group C70 and group C75. The pre-experimental period lasted for 15 days, and the experimental period lasted for 60 days. The results showed as follows:1) the total weight gain and average daily gain of group C65 and group C70 were significantly higher than those of group C75 (P<0.05), and the feed to gain ratio was significantly lower than that of group C75 (P<0.05). 2) The dry matter apparent digestibility of group C65 and group C70 was significantly higher than that of group C75 (P<0.05), the crude protein apparent digestibility of group C65 was significantly higher than that of group C75 (P<0.05), and the neutral detergent fiber apparent digestibility of group C65 was significantly higher than that of group C70 and group C75 (P<0.05). 3) The serum globulin (GLB) content and alanine aminotransferase (ALT) activity of group C75 were significantly lower than those of group C65 and group C70 (P<0.05). 4) The rumen fluid pH and microbial protein content of group C65 were significantly higher than those of group C70 and group C75 (P<0.05), the rumen fluid ammonia nitrogen content of group C65 was significantly lower than that of group C70 and group C75 (P<0.05), and the contents of isobutyric acid and isovaleric acid in rumen fluid of group C65 were significantly lower than those of group C70 (P<0.05). In conclusion, increasing the dietary concentrate to roughage ratio can reduce the total weight gain and average daily weight gain of yak in late stage of fattening, and it has a certain inhibitory effect on protein synthesis and nutrient digestion. Under this experimental condition, the best fattening effect is achieved when the dietary concentrate to roughage ratio is 65:35.

Cite this article

LI Yan , DAI Dongwen , YANG Yingkui , WANG Xun , LIU Shujie , HONG Wei , CHAI Shatuo , WANG Shuxiang . Effects of Diets with Different Concentrate to Roughage Ratios on Growth Performance, Nutrient Apparent Digestibilities, Serum Biochemical Indexes and Rumen Fermentation Parameters of Yak in Late Stage of Fattening[J]. Chinese Journal of Animal Nutrition, 2022 , 34(5) : 3056 -3065 . DOI: 10.3969/j.issn.1006-267x.2022.05.034

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