Effects of Starvation and Refeeding on Growth Performance, Nutrient Apparent Digestibility and Serum Indices of Yaks

ZENG Shaoyu, WANG Zhisheng, PENG Quanhui, XUE Bai, WANG Lizhi, ZOU Huawei, HU Rui, ZHU Yixiao, ZHOU Xinyu, LIU Jianzhong

doi:10.3969/j.issn.1006-267x.2018.12.027

Chinese Journal of Animal Nutrition >

2018 , Vol. 30 >Issue 12: 4991 - 5001

DOI: https://doi.org/10.3969/j.issn.1006-267x.2018.12.027

Molecular Nutrition

Effects of Starvation and Refeeding on Growth Performance, Nutrient Apparent Digestibility and Serum Indices of Yaks

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1. Key Laboratory of Bovine Low-Carbon Farming and Safe Production of Higher Education in Sichuan Province, Animal Nutrition Institute, Sichuan Agricultural University, Ya'an 625014, China;
2. Road Biological Environmental Technology(Gulin) Co., Ltd., Luzhou 646509, China

Received date: 2018-05-14

Online published: 2018-12-19

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Abstract

The present study was conducted to investigate the changes of growth, digestibility and metabolism of yaks under normal feeding, starvation, and refeeding conditions. Six healthy three-year-old yaks were selected as experimental animals which average body weight was (183.60±15.62) kg. The trial was divided into normal feeding period (7 d), starvation period (7 d) and refeeding period (28 d). The results showed as follows: 1) yaks lost about 10.06% of body weight after 7-day starvation. The dry matter intake and feed/gain were significantly lower in the first three weeks of refeeding period than normal feeding period (P<0.05). Compared with normal feeding period, the average daily gain of yaks was significantly increased in the first two weeks of refeeding period (P<0.05); the apparent digestibility of crude protein and ether extract were significantly improved in the first week of refeeding period (P<0.05); no significant differences were found in the feed/gain and apparent digestibility of ether extract in fourth week of refeeding period (P>0.05). 2) Serum glucose, triglyceride, urea nitrogen and creatinine contents were significantly decreased (P<0.05) and serum non-esterified fatty acid content was significantly increased in starvation period compared with normal feeding period (P<0.05). Compared with normal feeding period, serum glucose content was significantly increased in the first and third weeks of refeeding period than normal feeding period (P<0.05); serum non-esterified fatty acids and total protein contents was significantly increased in the first and second weeks of refeeding period (P<0.05); serum triglyceride content was significantly reduced in the second and third weeks of refeeding period (P<0.05); the contents of metabolites in serum had no significant differences in the fourth week of refeeding period (P>0.05). 3) The contents of insulin, growth hormone and insulin-like growth factor Ⅰ in serum were significantly reduced in starvation period contrast to normal feeding period (P<0.05). In the second week of refeeding period, serum insulin content was significantly increased (P<0.05) contrast to normal feeding period (P<0.05). Serum insulin-like growth factor Ⅰ was significantly elevated in first three weeks of refeeding period compared with normal feeding period (P<0.05). Serum growth hormone and insulin like growth factor Ⅰ contents had no significant differences in the fourth week of refeeding period compared with normal feeding period (P>0.05). It is concluded that the yaks adapt to starvation by increasing the catabolism of lipid and decreasing the metabolism of glucose and protein. The first three weeks of refeeding period are important for compensatory growth of yaks.

Key words： yaks; starvation; refeeding; growth performance; nutrient apparent digestibility; serum indices

Cite this article

ZENG Shaoyu, WANG Zhisheng, PENG Quanhui, XUE Bai, WANG Lizhi, ZOU Huawei, HU Rui, ZHU Yixiao, ZHOU Xinyu, LIU Jianzhong . Effects of Starvation and Refeeding on Growth Performance, Nutrient Apparent Digestibility and Serum Indices of Yaks[J]. Chinese Journal of Animal Nutrition, 2018 , 30(12) : 4991 -5001 . DOI: 10.3969/j.issn.1006-267x.2018.12.027

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