Effect of Early Weaning on Performance and Gastrointestinal Tract Development of Hu lambs

MA Zhiyuan, LI Fei, LI Fadi, LI Chong, WANG Weimin, TANG Defu, LIU Ting, PAN Xiangyu

doi:10.3969/j.issn.1006-267x.2015.05.008

Chinese Journal of Animal Nutrition >

2015 , Vol. 27 >Issue 5: 1385 - 1393

DOI: https://doi.org/10.3969/j.issn.1006-267x.2015.05.008

Ruminant Nutrition

Effect of Early Weaning on Performance and Gastrointestinal Tract Development of Hu lambs

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1. College of Pastoral Agriculture Science and Technology, Lanzhou University, Lanzhou 730020, China;
2. College of Animal Science and Technology, Gansu Agricultural University, Lanzhou 730070, China

Received date: 2014-12-19

Online published: 2015-05-13

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Abstract

Forty-eight new born male Hu lambs with birth weight of (3.51±0.57) kg were randomly divided into two groups in order to study the feasibility of 28-day weaning strategy. Lambs in early-weaned group (weaned at 28 days of age) and control group (weaned at 56 days of age) were fed starter from 7 days of age. Growing diet gradually introduced since 60 days of age in both groups. Lambs were weighted, and six lambs in each group were slaughtered to measure the weight and volume of stomach compartments, and the weight and length of intestinal tract at 42, 56, 70 and 84 days of age, respectively. The results showed as follows: 1) body weight of lambs at 42, 56, 70 and 84 days of age in the two groups was not significantly different (P>0.05), the same as average daily gain; 2) the weight and volume of reticulorumen and omasum, the relative weight (percentage of live weight, percentage of gastrointestinal tract weight, and percentage of stomach weight) and the relative volume (percentage of stomach volume) of reticulorumen in early-weaned group were significantly higher than those in control group at 42 and 56 days of age (P<0.05); 3) there were no significant differences in weight and length of all segments of intestinal tract between the two groups at all time points (P>0.05) except the weight of colon at 70 days of age. It is concluded that weaning at 28 days of age is a feasible strategy for promoting gastrointestinal tract development of Hu lambs under this experimental condition.

Key words： Hu lambs; early-weaning; performance; gastrointestinal tract development

Cite this article

MA Zhiyuan, LI Fei, LI Fadi, LI Chong, WANG Weimin, TANG Defu, LIU Ting, PAN Xiangyu . Effect of Early Weaning on Performance and Gastrointestinal Tract Development of Hu lambs[J]. Chinese Journal of Animal Nutrition, 2015 , 27(5) : 1385 -1393 . DOI: 10.3969/j.issn.1006-267x.2015.05.008

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