Energy Requirement of Yunnan Semi-Fine-Wool Sheep during Growing Period by Regression Model Method

LI Xiang; LU Mingli; HONG Qionghua; XUE Bai; WU Yuhan; HU Anhai; WANG Zhisheng; WANG Lizhi; PENG Quanhui

doi:10.3969/j.issn.1006-267x.2020.01.052

Chinese Journal of Animal Nutrition >

2020 , Vol. 32 >Issue 1: 447 - 454

DOI: https://doi.org/10.3969/j.issn.1006-267x.2020.01.052

Energy Requirement of Yunnan Semi-Fine-Wool Sheep during Growing Period by Regression Model Method

LI Xiang ,
LU Mingli ,
HONG Qionghua ,
XUE Bai ,
WU Yuhan ,
HU Anhai ,
WANG Zhisheng ,
WANG Lizhi ,
PENG Quanhui

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1. Institute of Animal Nutrition, Sichuan Agricultural University, Chengdu 611130, China;
2. Yunnan Animal Science and Veterinary Institute, Kunming 650224, China

Received date: 2019-07-02

Online published: 2020-01-19

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Abstract

The objective of this study was to determine the energy requirement of Yunnan semi-fine-wool sheep during growing period, and provide theoretical data for formulating diet for this species. The combination method of feeding experiment and digestion and metabolism experiment was used in this experiment. Forty-five castrated Yunnan semi-fine-wool sheep, weighted (33.30±1.77) kg and aged 10 months, were randomly allocated to 5 groups with 9 replicates per group and 1 sheep per replicate. The metabolic energy levels for diets of 5 groups were 8.00, 8.60, 9.20, 9.80 and 10.40 MJ/kg, respectively, and other nutrient levels were consistent. There was a pretrial period of 15 d followed by an experimental period of 30 d. On the 7th day of the experimental experiment, five sheep were randomly selected from each group in metabolism cage for digestion and metabolism experiment of 7d by total collection of feces and urine. The results showed as follows:1) dietary energy level had significant effects on final body weight, dry matter intake and feed/gain of Yunnan semi-fine-wool sheep (P<0.05), and the feed/gain was significantly decreased with the dietary energy level increasing (P<0.05). 2) Dietary energy level had significant effects on the gross energy apparent digestibility, gross energy metabolic rate and digestive energy metabolic rate of Yunnan semi-fine-wool sheep (P<0.05), and them were increased with the dietary energy level increasing. 3) The regression equations between digestible energy (DE) or metabolizable energy (ME) intakes and metabolic weight (W^0.75) and average daily gain (ADG) of Yunnan semi-fine-wool sheep during growing period were DE(MJ/d)=0.678 0W^0.75+0.028ADG(P<0.001, R²=0.999) and ME(MJ/d)=0.570 7W^0.75+0.025ADG(P<0.001, R²=0.999), respectively. According to above findings, the requirement of maintenance ME for Yunnan semi-fine-wool sheep during growing period is 0.570 7 MJ/(kg W^0.75·d), and the requirement of ME for 100 g gain is 2.5 MJ.

Key words： Yunnan semi-fine-wool sheep; growing period; energy; requirement

Cite this article

LI Xiang , LU Mingli , HONG Qionghua , XUE Bai , WU Yuhan , HU Anhai , WANG Zhisheng , WANG Lizhi , PENG Quanhui . Energy Requirement of Yunnan Semi-Fine-Wool Sheep during Growing Period by Regression Model Method[J]. Chinese Journal of Animal Nutrition, 2020 , 32(1) : 447 -454 . DOI: 10.3969/j.issn.1006-267x.2020.01.052

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