Effects of Rumen-Protected Lysine and Rumen-Protected Methionine on Lactation Performance of Female Yaks and Growth Performance of Calves

CAO Hanwen; ZHANG Chengfu; XIN Jinwei; ZHU Yong; ZHANG Qiang; JIANG Hui; CI Danyangji; XIAN Lili; CHEN Xiaoying

doi:10.3969/j.issn.1006-267x.2021.11.026

2021 , Vol. 33 >Issue 11: 6257 - 6265

DOI: https://doi.org/10.3969/j.issn.1006-267x.2021.11.026

RUMINANT AND HERBIVORE NUTRITION AND FEED

Effects of Rumen-Protected Lysine and Rumen-Protected Methionine on Lactation Performance of Female Yaks and Growth Performance of Calves

CAO Hanwen ,
ZHANG Chengfu ,
XIN Jinwei ,
ZHU Yong ,
ZHANG Qiang ,
JIANG Hui ,
CI Danyangji ,
XIAN Lili ,
CHEN Xiaoying

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1. State Key Laboratory of Hulless Barley and Yak Germplasm Resources and Genetic Improvement, Tibet Academy of Agricultural and Animal Sciences, Lhasa 850000, China;
2. Institute of Animal Science and Veterinary, Tibet Academy of Agricultural and Animal Husbandry Sciences, Lhasa 850009, China

Received date: 2021-04-08

Online published: 2021-11-10

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Abstract

This experiment was aimed to study the effects of different levels of rumen-protected lysine (RPlys) and rumen-protected methionine (RPMet) on lactation performance of lactating yak and growth performance of calves. Forty healthy lactating female yaks with similar body weight were selected and divided into four groups, and all female yaks had calves. The control group was fed a basic diet, and the experimental group was fed the basic diet with 5,10,15 g/d RPlys and RPMet (RPlys:RPMet=3:1). The pretest period was 7 days and the trial period was 42 days. At the beginning and end of feeding, milk yield and milk composition of lactating yaks, body size index and growth performance indexes of calves were measured. The results showed as follows:1) adding 10 g/d RPlys and RPMet to the diet could increase the milk protein content of lactating yaks (P<0.05), but had no significant effects on milk yield, milk fat percentage, lactose, total solids and amino acids contents (P>0.05). 2) The addition of 10 g/d RPlys and RPMet in the diet could improve the chest girth, body index, final weight, total weight gain, average daily gain and fatness index of calves (P<0.05), but had no significant effects on body height, body length, tube circumference and body length index (P>0.05). It is concluded that adding 10 g/d RPlys and RPMet to the diet can improve the lactation performance of lactating yaks and have positive effects on calves' performance.

Key words： rumen-protected lysine; rumen-protected methionine; lactating yaks; calves; body size index; growth performance

Cite this article

CAO Hanwen , ZHANG Chengfu , XIN Jinwei , ZHU Yong , ZHANG Qiang , JIANG Hui , CI Danyangji , XIAN Lili , CHEN Xiaoying . Effects of Rumen-Protected Lysine and Rumen-Protected Methionine on Lactation Performance of Female Yaks and Growth Performance of Calves[J]. Chinese Journal of Animal Nutrition, 2021 , 33(11) : 6257 -6265 . DOI: 10.3969/j.issn.1006-267x.2021.11.026

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