Effects of Feeding Level on Nutrient Metabolism and Energy Requirement Parameters of Crossbred Male Sheep

WEI Bingdong, DIAO Qiyu, CHEN Qun, YANG Huaming, QIU Yulang, WANG Shiqin, LI Lin

doi:10.3969/j.issn.1006-267x.2017.10.016

Chinese Journal of Animal Nutrition >

2017 , Vol. 29 >Issue 10: 3551 - 3562

DOI: https://doi.org/10.3969/j.issn.1006-267x.2017.10.016

Molecular Nutrition

Effects of Feeding Level on Nutrient Metabolism and Energy Requirement Parameters of Crossbred Male Sheep

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1. Key Laboratory of Feed Biotechnology of Ministry of Agriculture, Feed Research Institute, Chinese Academy of Agricultural Sciences, Beijing 100081, China;
2. Branch Institute of Animal Husbandry, Jilin Academy of Agricultural Sciences, Gongzhuling 136100, China

Received date: 2017-03-17

Online published: 2017-09-28

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Abstract

This experiment was conducted to investigate nutrient metabolism and energy requirement parameters of crossbred male sheep using open respiratory calorimetry measuring device. The trail was conducted according to a completely random design. Fifteen Dorper and thin-tailed Han sheep crossbred F1 lambs were randomly allocated to 3 groups with 5 lambs per group. The lambs were offered diet for ad libitum (AL), 70% (IR70) and 40% of ad libitum intake(IR40), respectively. At 22 and 35 kg of body weight, two periods of test were carried out. Each period consisted of digestion and metabolism test (3 d of pre-experiment and 5 d of experiment) and respiratory metabolism test (after 24 h adaption in respiratory metabolism room, 5 d recording was carried out). The results showed as follows:1) with the decrease of feeding level, average daily gain was significantly decreased (P<0.01), and final weight of IR40 group was significantly lower than AL group (P<0.01). 2) With the decrease of feeding level, dry matter and nitrogen intakes were significantly decreased (P<0.01), while apparent digestibility of them were not significantly affected (P>0.05). 3) With the decrease of feeding level, methane production, methane energy and heat production were deceased, and IR40 group was significantly lower than AL group (P<0.01). 4) After fasting for 60 h, respiratory quotient was 0.71, methane production of the first and second periods was 0.86 and 1.18 L/d, respectively, fasting heat production (FHP) was 0.211 and 0.26 MJ/kg W^0.75, respectively, and net energy for maintenance (NEm) was 0.252 and 0.312 MJ/kg W^0.75, respectively. It is concluded that with the decrease of feeding level, growth performance, nutrient intakes, average daily gain, methane production, methane energy and heat production are decreased, while apparent digestibility of nutrients are not significantly affected. Under fasting condition, methane production is 0.86 to 1.18 L/d, FHP is 0.211 to 0.260 MJ/kg W^0.75, and NEm is 0.252 to 0.312 MJ/kg W^0.75.

Key words： meat sheep; energy metabolism; feeding level; open respiratory calorimetry measuring device

Cite this article

WEI Bingdong, DIAO Qiyu, CHEN Qun, YANG Huaming, QIU Yulang, WANG Shiqin, LI Lin . Effects of Feeding Level on Nutrient Metabolism and Energy Requirement Parameters of Crossbred Male Sheep[J]. Chinese Journal of Animal Nutrition, 2017 , 29(10) : 3551 -3562 . DOI: 10.3969/j.issn.1006-267x.2017.10.016

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