Effects of Diets with Different Protein Levels on Growth and Development of Tibetan Lambs

CUI Xiaopeng, HOU Shengzhen, WANG Zhiyou, MA Liaowei

doi:10.3969/j.issn.1006-267x.2017.03.041

Chinese Journal of Animal Nutrition >

2017 , Vol. 29 >Issue 3: 1065 - 1073

DOI: https://doi.org/10.3969/j.issn.1006-267x.2017.03.041

Molecular Nutrition

Effects of Diets with Different Protein Levels on Growth and Development of Tibetan Lambs

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College of Agriculture and Animal Husbandry, Qinghai University, Xining 810016, China

Received date: 2016-09-21

Online published: 2017-03-09

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Abstract

This experiment was conducted to evaluate the effects of diets with different protein levels on growth and development of Tibetan lambs. Using a single factor randomized trial design, ninety two-month-weaning Tibetan male lambs with (20.80±2.75) kg of body weight were randomly allocated to 3 groups with 30 replicates per group and 1 lamb per replicate. The lambs in those three groups were fed three experimental diets with different protein levels (10.8%, 12.0% and 13.2%, respectively). The experiment lasted for 127 days, and there was a pretrial period of 7 days followed by an experimental period of 120 days. The results showed as follows:1) the 60th to 90th day and the 90th to 120th day daily gain and average daily gain of 12.0% protein level group were the highest, while feed to gain ratio was the lowest. 2) The diarrhea rate and urethral infection rate of lambs of 12.0% protein level group were lower, and the mortality was the lowest. 3) At the 60th day of experiment, no significant difference in serum total protein content was found between 12.0% protein level group and 10.8% or 13.2% protein level groups (P>0.05), but a significant difference was found between 10.8% and 13.2% protein level groups (P<0.05). At the 90th and 20th day of experiment, serum total protein content of 12.0% and 13.2% protein level groups was significantly higher than that of 10.8% protein level group (P<0.05), but no significant difference was found between 12.0% and 13.2% protein level groups (P>0.05). At each stage, serum glucose and total cholesterol contents had no significant changes with dietary protein level increasing (P>0.05). 4) The gain weight per unit cost of 12.0% protein level group was the highest, and it reached up to 73.05 RMB/kg. The total income and net income of 12.0% protein level group were the highest with the net income reached up to 7 800.51 RMB. Under this experimental condition, it is concluded that dietary protein level can affect the growth and development of early-weaning Tibetan lambs. And 12.0% protein level can improve the Tibetan lambs' daily gain, reduce the feed to gain ratio and mortality, improve the serum biochemical parameters, improve the growth performance, and lower the feed cost.

Key words： protein level; Tibetan lambs; daily gain; feed to gain ratio; serum biochemical parameters

Cite this article

CUI Xiaopeng, HOU Shengzhen, WANG Zhiyou, MA Liaowei . Effects of Diets with Different Protein Levels on Growth and Development of Tibetan Lambs[J]. Chinese Journal of Animal Nutrition, 2017 , 29(3) : 1065 -1073 . DOI: 10.3969/j.issn.1006-267x.2017.03.041

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