Effects of Dietary Methionine Restriction and Compensation on Growth Performance and Visceral Organ Development of Lambs

WANG Jie; CUI Kai; BI Yanliang; CHAI Jianmin; QI Minli; ZHANG Fan; WANG Shiqin; DIAO Qiyu; ZHANG Naifeng

doi:10.3969/j.issn.1006-267x.2016.11.037

2016 , Vol. 28 >Issue 11: 3669 - 3678

DOI: https://doi.org/10.3969/j.issn.1006-267x.2016.11.037

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Effects of Dietary Methionine Restriction and Compensation on Growth Performance and Visceral Organ Development of Lambs

WANG Jie ,
CUI Kai ,
BI Yanliang ,
CHAI Jianmin ,
QI Minli ,
ZHANG Fan ,
WANG Shiqin ,
DIAO Qiyu ,
ZHANG Naifeng

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

Received date: 2016-05-16

Online published: 2016-11-18

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Abstract

The aim of this study was to assess the effects of dietary methionine (Met) restriction and compensation on growth performance and visceral organ development of lambs. Twelve pairs of male Hu twin lambs weaned at one week of age were selected and divided into two groups with a matched-pairs design. During 2 to 8 weeks of age, lambs were fed diets containing either sufficient[basal milk replacer+0.70% Met and basal starter+0.40% Met, control (CON) group] or deficient Met[basal milk replacer and basal starter, restriction (RES) group]. During 9 to 12 weeks of age, all lambs were fed diets containing sufficient Met (basal starter+0.40% Met). Six twins each time were slaughtered at the end of 8 and 12 weeks of age for weighting visceral organs, respectively. The results showed as follows:1) body weight of 8-week-old lambs in RES group was significantly lower than that in CON group (P<0.05); average daily gain in RES group was significantly lower than that in CON group during 2 to 8 weeks of age (P<0.01), whereas feed to gain ratio was significantly higher (P<0.05); no significant differences were found in average daily gain and feed to gain ratio between two groups during 9 to 12 weeks of age (P>0.05). 2) Live body weight before slaughter, empty body weight, carcass weight of 8-week-old lambs in RES group were significantly lower than those in CON group (P<0.05), but no significant difference was found in dressing percentage between two groups (P>0.05); no significant differences were observed in live body weight before slaughter, empty body weight, carcass weight, and dressing percentage between groups at 12 weeks of age (P>0.05). 3) No significant differences were observed in weights and percentages of live body weight before slaughter of visceral organs between groups at 8 and 12 weeks of age (P>0.05). 4) No significant differences were observed in gastrointestinal tract indexes between groups at 8 and 12 weeks of age (P>0.05) except rumen weight at 8 weeks of age, which was significantly lower in RES group than in CON group (P<0.05). In conclusion, dietary restriction of Met level results in decreased rumen weight, growth performance and slaughter performance of lambs, but subsequent recoveries of growth performance and visceral organ development appear after the compensation of dietary Met level.

Key words： lamb; methionine restriction; methionine compensation; growth performance; visceral organ development

Cite this article

WANG Jie , CUI Kai , BI Yanliang , CHAI Jianmin , QI Minli , ZHANG Fan , WANG Shiqin , DIAO Qiyu , ZHANG Naifeng . Effects of Dietary Methionine Restriction and Compensation on Growth Performance and Visceral Organ Development of Lambs[J]. Chinese Journal of Animal Nutrition, 2016 , 28(11) : 3669 -3678 . DOI: 10.3969/j.issn.1006-267x.2016.11.037

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