Effects Supplementation of Concentrates with Different Ratios of Energy to Nitrogen on Performance and Serum Indices in Lambs in Pastoral Areas in Winter and Spring

YANG Chuntao; SI Bingwen; Siqinbateer; Sarenhua; Sudebilige; JIN Hai; CUI Xiang; DIAO Qiyu; TU Yan

doi:10.3969/j.issn.1006-267x.2015.01.035

2015 , Vol. 27 >Issue 1: 289 - 297

DOI: https://doi.org/10.3969/j.issn.1006-267x.2015.01.035

Short Communications

Effects Supplementation of Concentrates with Different Ratios of Energy to Nitrogen on Performance and Serum Indices in Lambs in Pastoral Areas in Winter and Spring

YANG Chuntao ,
SI Bingwen ,
Siqinbateer ,
Sarenhua ,
Sudebilige ,
JIN Hai ,
CUI Xiang ,
DIAO Qiyu ,
TU Yan

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1. Feed Research Institute, Chinese Academy of Agricultural Sciences, Key Laboratory of Feed Biotechnology, Ministry of Agriculture, Beijing 100081, China;
2. Animal Husbandry Station, Xianghuangqi County, Xilinguole 013250, China;
3. Inner Mongolia Academy of Agricultural & Animal Husbandry Sciences, Huhhot 010031, China

Received date: 2014-07-04

Online published: 2015-01-10

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Abstract

This study was aimed to investigate the effects of supplementation of concentrates with different ratios of energy to nitrogen on performance and serum indices in weaner lambs in pastoral areas of Inner Mongolia that only had low quality roughages in winter and spring. One hundred and twenty eight (half male and half female) healthy weaner lambs aged (61±2) days with weight of (20.56±1.43) kg were assigned to four groups using single factor experimental design. There were 32 replicates in each group and 1 lamb in each replicate. Lambs in four groups were supplemented with concentrates with similar digestive energy (DE) level and gradually increased crude protein (CP) levels, and the ratio of energy to nitrogen (calculated by DE/CP) was 90.03 (group Ⅰ), 82.55 (group Ⅱ), 73.25 (group Ⅲ) and 67.87 MJ/kg (group Ⅳ), respectively. The experiment lasted for 40 days. The results showed as follows: 1) average daily gain of group Ⅲ was the highest, and was 7.75%, 4.94%, 3.41% higher than that of groups Ⅳ (P<0.01), Ⅰ (P<0.05) and Ⅱ (P>0.05), respectively. Moreover, group Ⅲ had optimal feed/gain. 2) Final withers height of group Ⅰ was significantly lower than that of the other groups (P<0.01), that of female lambs of groups Ⅱ, Ⅲ and Ⅳ was 3.68%, 4.12% and 4.44% higher than that of group Ⅰ (P<0.05); the gain and growth rate of heart girth were not significantly affected by supplementation of concentrate with different ratios of energy to nitrogen or gender (P>0.05). 3) Serum content of urinary nitrogen gradually increased with the increasing of concentrate protein level, and group Ⅳ was significantly higher than groups Ⅰ and Ⅱ (P<0.01); serum content of interleukin 6 of group Ⅲ was significantly higher than that of groups Ⅱ and Ⅳ (P<0.05), and serum content of immunoglobulin M was higher than that of the other groups (P<0.05). The results indicate lambs in pastoral areas can achieve better growth performance when they were timely supplied concentrate. Under conditions in the present study, concentrates with different ratios of energy to nitrogen have a significant impact on some serum indices, and the optimum ratio of energy to nitrogen of the concentrate is 73.25 MJ/kg.

Key words： lambs in pastoral areas; supplementation; ratio of energy to nitrogen; growth performance; serum indices

Cite this article

YANG Chuntao , SI Bingwen , Siqinbateer , Sarenhua , Sudebilige , JIN Hai , CUI Xiang , DIAO Qiyu , TU Yan . Effects Supplementation of Concentrates with Different Ratios of Energy to Nitrogen on Performance and Serum Indices in Lambs in Pastoral Areas in Winter and Spring[J]. Chinese Journal of Animal Nutrition, 2015 , 27(1) : 289 -297 . DOI: 10.3969/j.issn.1006-267x.2015.01.035

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