Effect of Different Protein Levels of Supplementary Diets on Performance and Gastrointestinal Development in Early-Weaned Yak Calves

ZHOU Aimin, WANG Wei, WANG Zhisheng, ZOU Huawei, PENG Quanhui, FENG Yucheng, HE Xiaolin, YIN Mancai, LA Huan

doi:10.3969/j.issn.1006-267x.2015.03.032

2015 , Vol. 27 >Issue 3: 918 - 925

DOI: https://doi.org/10.3969/j.issn.1006-267x.2015.03.032

Short Communications

Effect of Different Protein Levels of Supplementary Diets on Performance and Gastrointestinal Development in Early-Weaned Yak Calves

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1. Institute of Animal Nutrition, Sichuan Agricultural University, Ya'an 625014, China;
2. Mianyang Academy of Agricultural Sciences, Mianyang 621023, China;
3. Datong Yak Breeding Farm of Qinghai Province, Datong 810102, China

Received date: 2014-10-09

Online published: 2015-03-18

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Abstract

This study was conducted to evaluate the effects of supplementary diets containing different levels of protein on performance, blood indexes and gastrointestinal development of early-weaned yak calves. Forty-eight healthy female Datong weaned yak calves aged about 3 months [(90 ± 5) days of age] were selected and assigned randomly to four groups with four replicates in each group and 3 heads per replicate. Yaks in control group were grazed only, and those in experimental groups were grazed and fed isoenergetic (net energy for gain=5.6 MJ/kg) supplementary diets contained 17%, 18% and 19% crude protein (CP), respectively. The pre-experiment lasted for 7 days, and the experiment lasted for 60 days. The results showed as follows: contrast with control group, 1) the average daily gain were significantly increased by supplementary, and that in 17%, 18% and 19% supplementary groups was increased by 28.87%, 47.47%, 28.61% (P<0.05), respectively; 2)the supplementary significantly increased the concentration of serum urea nitrogen, and that in 17%, 18% and 19% supplementary groups was increased 10.57%, 16.64% and 21.84% (P<0.05), respectively; 3) the absolute weight and the relative weight of rumen and large intestine were significantly enhanced by supplementary diet containing 18% CP (P<0.05), and the villus height of duodenum, caecum and colon, and villus height/crypt depth of duodenum and caecum were significantly improved, too (P<0.05). These results indicate that supplementary diet is contributed to improve the production performance and gastrointestinal development of early-weaned female yak calves, and the optimal CP level is 18%.

Key words： female yak calves; supplementary diet; protein level; performance; gastrointestinal development

Cite this article

ZHOU Aimin, WANG Wei, WANG Zhisheng, ZOU Huawei, PENG Quanhui, FENG Yucheng, HE Xiaolin, YIN Mancai, LA Huan . Effect of Different Protein Levels of Supplementary Diets on Performance and Gastrointestinal Development in Early-Weaned Yak Calves[J]. Chinese Journal of Animal Nutrition, 2015 , 27(3) : 918 -925 . DOI: 10.3969/j.issn.1006-267x.2015.03.032

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