Effects of Early Weaning Time on Tissue and Organ Development, Slaughter Performance and Meat Quality of Hu Lambs

CHAI Jianmin; DIAO Qiyu; TU Yan; WANG Haichao; ZHANG Naifeng

doi:10.3969/j.issn.1006-267x.2014.07.016

Chinese Journal of Animal Nutrition >

2014 , Vol. 26 >Issue 7: 1838 - 1847

DOI: https://doi.org/10.3969/j.issn.1006-267x.2014.07.016

Ruminant Nutrition

Effects of Early Weaning Time on Tissue and Organ Development, Slaughter Performance and Meat Quality of Hu Lambs

CHAI Jianmin ,
DIAO Qiyu ,
TU Yan ,
WANG Haichao ,
ZHANG Naifeng

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

Received date: 2014-02-20

Online published: 2014-07-01

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Abstract

In order to find the best early weaning time, the effects of early weaning time on tissue and organ development, slaughter performance and meat quality of Hu lambs were investigated in this experiment. Forty-eight new born Hu lambs with born weight of (2.5±0.2) kg were randomly divided into four groups with three replicates in each group and four lambs per replicate. Lambs in ER group (control group) were ewe reared to 60 days of age; lambs in EW10, EW20 and EW30 groups were weaned at 10, 20 and 30 days of ages, respectively, and were fed milk replacer to 60 days of age. All lambs were fed starter for fattening from 61 to 90 days of age. Four lambs in each group were slaughtered to determine tissue and organ weight, slaughter performance and meat quality at 90 days of age. The results showed as follows: body weight at 90 days of age, net gain and average daily gain in test groups were significantly higher than those in ER group (P0.05); partial slaughter indexes (live weight before slaughter, carcass weight and empty body weight) showed the same tendency as the above growth performance indices, while no significant differences were found in dressing percentage, eye muscle area and GR value among all the groups (P>0.05); lambs in test groups had significantly higher feet weight than ER group (P0.05); kidney weight in EW30 group was significantly lower than that in the rest three groups (P0.05), and no significant differences were found in the weight of the rest organs and tissues (P>0.05); rumen weight in test groups was significantly higher than that in ER group (P0.05); the eye muscle color's L^* and b^* values in test groups were significantly higher than those in ER group (P<0.05), while a^* value, water losing rate and drip loss of eye muscle, and gluteus color's L^*, a^* and b^* values were not significantly different among all the groups (P<0.05). It is concluded that early weaning is advantageous to upper growth and development of Hu lambs, especially at late growing stage, and 10 days of age is the best weaning time of Hu lambs for growth, organ and tissue development and meat production.

Key words： the lamb; early weaning time; slaughter performance; tissue and organ development; meat quality

Cite this article

CHAI Jianmin , DIAO Qiyu , TU Yan , WANG Haichao , ZHANG Naifeng . Effects of Early Weaning Time on Tissue and Organ Development, Slaughter Performance and Meat Quality of Hu Lambs[J]. Chinese Journal of Animal Nutrition, 2014 , 26(7) : 1838 -1847 . DOI: 10.3969/j.issn.1006-267x.2014.07.016

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