RESEARCH PAPER

Energy and Protein Maintenance Requirements of Yaks during Lactation

  • ZHANG Yuying ,
  • PAN Hao ,
  • WANG Tong ,
  • LIU Shujie ,
  • CUI Zhanhong
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  • Qinghai Provincial Key Laboratory of Animal Nutrition and Feed Science for Plateau Grazing Livestock, Qinghai Yak Engineering Research Center, College of Animal Science and Veterinary Sciences, Qinghai University, Xining 810016, China

Received date: 2021-06-23

  Online published: 2022-03-14

Abstract

This experiment was conducted to study the energy and protein maintenance requirements of yak during lactation. Fifteen yaks with the same body weight, parity and similar calving date were randomly divided into 3 groups with 5 yaks in each group, i.e., free feeding group (free feeding), 80% feeding group (80% feed intake of free feeding group of the previous day) and 60% feeding group (60% feed intake of free feeding group of the previous day). All the yaks were fed in a single pen, they fed diets according to the experimental design and drank water freely. The experiment was divided into early lactation (days 31 to 70 of lactation) and late lactation (days 71 to 135 of lactation). Digestion and gas metabolism tests were conducted successively after feeding trial, and apparent digestibility of nutrients and the metabolic indexes of carbon, nitrogen and energy were measured. By establishing regression equations of metabolic energy intake (MEI) and energy deposition (ER), intake nitrogen (NI) and deposition nitrogen (NR), the metabolic energy and net protein requirements for maintenance during lactation were obtained. The results showed that the apparent digestibility of dry matter (DM), organic matter (OM), neutral detergent fiber (NDF) and acid detergent fiber (ADF) varied from 65.11% to 71.94%, 68.65% to 75.19%, 56.78% to 65.68% and 44.91% to 54.94%, respectively, and the respiratory entropy ranged from 0.70 to 0.74, the carbon apparent digestibility ranged from 65.60% to 70.72%. The regression equation of MEI[kJ/(kg W0.75·d)] and ER[kJ/(kg W0.75·d)] of yaks during lactation was as follow:ER=1.186 0(±0.192)MEI-592.715(±133.24), when ER=0, namely, the metabolic energy maintenance requirement during lactation was 499.76 kJ/(kg W0.75·d). The regression equation of NI[kJ/(kg W0.75·d)] and NR[kJ/(kg W0.75·d)] of yaks during lactation was as follow:NR=0.403 0(±0.048)NI-0.359 1(±0.060), the vertical intercept was the net nitrogen maintenance requirement during lactation, multiplied by the coefficient 6.25 to obtain the net protein maintenance requirement during lactation of 2.24 kJ/(kg W0.75·d). In conclusion, the metabolic energy and net protein maintenance requirements of yaks during lactation are obtained in this study, they are 499.76 kJ/(kg W0.75·d) and 2.24 g/(kg W0.75·d), respectively.

Cite this article

ZHANG Yuying , PAN Hao , WANG Tong , LIU Shujie , CUI Zhanhong . Energy and Protein Maintenance Requirements of Yaks during Lactation[J]. Chinese Journal of Animal Nutrition, 2022 , 34(3) : 1655 -1666 . DOI: 10.3969/j.issn.1006-267x.2022.03.028

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