动物营养学报Issue(1)：289-297,9.DOI:10.3969/j.issn.1006-267x.2015.01.035
补饲不同能氮比精料对牧区冬春季羔羊生长性能和血液指标的影响
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
摘要
Abstract
This study was aimed to investigate the effects of supplementation of concentrates with different rati-os 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 fe-male) 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 grad-ually 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 groupⅢ was the high-est, 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 groupⅠ was sig-nificantly 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 groupⅣ was significantly higher than groupsⅠ andⅡ ( P<0.01);serum content of inter-leukin 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 ser-um indices, and the optimum ratio of energy to nitrogen of the concentrate is 73.25 MJ/kg.关键词
牧区羔羊/补饲/能氮比/生长性能/血清指标Key words
lambs in pastoral areas/supplementation/ratio of energy to nitrogen/growth performance/serum indices分类
农业科技引用本文复制引用
杨春涛,司丙文,斯琴巴特尔,萨仁花,苏德毕力格,金海,崔祥,刁其玉,屠焰..补饲不同能氮比精料对牧区冬春季羔羊生长性能和血液指标的影响[J].动物营养学报,2015,(1):289-297,9.基金项目
公益性行业(农业)科研专项(201303062) （农业）
