Effects of Dietary Energy and Protein Levels on Growth Performance, Nitrogen Metabolism and Serum Biochemical Indices of Hu Lambs at 61 to 120 Days of Age

LYU Xiaokang, QI Minli, WANG Jie, WANG Shiqin, CUI Kai, DIAO Qiyu, ZHANG Naifeng

doi:10.3969/j.issn.1006-267x.2017.12.016

2017 , Vol. 29 >Issue 12: 4355 - 4364

DOI: https://doi.org/10.3969/j.issn.1006-267x.2017.12.016

Molecular Nutrition

Effects of Dietary Energy and Protein Levels on Growth Performance, Nitrogen Metabolism and Serum Biochemical Indices of Hu Lambs at 61 to 120 Days of Age

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Key Laboratory of Feed Biotechnology of the Ministry of Agriculture, Feed Research Institute of Chinese Academy of Agricultural Sciences, Beijing 100081, China

Received date: 2017-05-19

Online published: 2017-12-04

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Abstract

This experiment was conducted to investigate the effects of dietary energy and protein levels on growth performance, nitrogen metabolism and serum biochemical indices of Hu lambs at 61 to 120 days of age. With a 2×2 two factors and two levels experimental design, sixty-four Hu lambs with similar body weight at 61 days of age were randomly allocated into 4 groups, which were high energy[metabolizable energy (ME)=10.92 MJ/kg] and high protein[crude protein (CP)=15.74%] group, high energy (ME=10.92 MJ/kg) and low protein (CP=11.78%) group, low energy (ME=8.64 MJ/kg) and high protein (CP=15.72%) group, and low energy (ME=8.64 MJ/kg) and low protein (CP=11.82%) group; each group had 4 replicates with 4 lambs per group. The experimental period lasted for 60 days. The results showed as follows:1) no interaction was observed between dietary energy and protein levels on growth performance of lambs (P>0.05); high dietary energy and protein levels improved average daily gain of lambs at 61 to 90 days of age (P<0.05), and significantly decreased feed to gain ratio (P>0.05). 2) Dietary high protein level significantly increased nitrogen intake of lambs at 81 to 90 days of age and 111 to 120 days of age (P<0.05); dietary low energy and high protein level significantly increased urinary nitrogen output of lambs at 81 to 90 days of age and 111 to 120 days of age (P<0.05), and low energy and high protein group had the highest value; at 81 to 90 days of age, dietary high energy and high protein levels significantly increased nitrogen retention (P<0.05), while dietary low energy level or high protein level significantly decreased biological value of nitrogen (P<0.05). 3) At 120 days of age, dietary low energy level significantly decreased serum glucose content (P<0.05), significantly increased serum urinary nitrogen content (P<0.05); moreover, dietary low protein level significantly increased serum insulin-like growth factor Ⅰ content (P<0.05). In summary, dietary high energy and protein levels can improve growth performance of lambs at 61 to 90 days of age; however, the feeding cost of lambs can be controlled without affecting growth performance with low protein diet at of 91 to 120 days of age.

Key words： lambs; energy level; protein level; growth performance; nitrogen metabolism; serum biochemical parameter

Cite this article

LYU Xiaokang, QI Minli, WANG Jie, WANG Shiqin, CUI Kai, DIAO Qiyu, ZHANG Naifeng . Effects of Dietary Energy and Protein Levels on Growth Performance, Nitrogen Metabolism and Serum Biochemical Indices of Hu Lambs at 61 to 120 Days of Age[J]. Chinese Journal of Animal Nutrition, 2017 , 29(12) : 4355 -4364 . DOI: 10.3969/j.issn.1006-267x.2017.12.016

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