| 摘要: |
| [目的]研究品种及日龄对绵羊断奶羔羊生长性能及其主要消化器官质量的影响,为我国地方绵羊品种资源的利用和肥羔肉的生产提供指导.[方法]选择健康无病、60日龄断奶的小尾寒羊、滩羊、蒙古羊各40只,分别在80,120,160和200日龄.各品种随机选择10只羔羊屠宰,测定其生长性能、平均日增质量和相对生长速率,并测定胃、胰腺、肝脏和小肠的质量.[结果]绵羊品种与日龄对羔羊体质量、平均口增质量和相对生长速率均有显著影响(P0.05),在120与160日龄间差异显著(P<0.05),在160与200日龄间,小尾寒羊和蒙古羊体质量差异显著(P<0.05),而滩羊则不显著(P>0.05).3个绵羊品种相比,小尾寒羊的平均日增质量和相对生长速率均最高,蒙古羊的均最低.日龄对各绵羊品种胃、肝、小肠质量增加影响显著(P<0.05),而对胰腺质量增加影响不显著(P>0.05).[结论] 120～160日龄是断奶羔羊快速生长阶段;小尾寒羊的生长性能优于滩羊和蒙古羊,宜作为肥羔生产的良种母本推广;羔羊胰腺的发育要早于胃、肝和小肠. |
| 关键词: 羔羊 生长性能 消化器官 绵羊 |
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| 基金项目:农业部公益性行业专项基金 |
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| Effect of breeds and day age on the growth performance and digestive organ weight in weaned lambs |
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| Abstract: |
| 【Objective】 This study determined the effects of breed and age on performance and digestive organ growth in lambs. 【Method】 120 sheep lambs from three breeds(Little-tail Han sheep,Tan sheep and Mongolia sheep,each N=40) weaned at 60 days old were selected and raised at the same conditions.The lambs were fed in three groups determined by breeds,and each group was divided into four levels by its slaughtered age,each level had 10 lambs.The measurements of relevant digestive organs were obtained and detailed after the lambs were slaughtered at 80,120,160 and 200-days old. 【Result】 The results showed that the breeds and day age had significant effects on body weight(BW),average daily gain(ADG) and relative growth rate(RGR) in lambs(P<0.05).Each group hadn’t significant weight increase (P>0.05) from 80 to 120 days old,and had significant weight increase from 120 to 160 days old(P<0.05).From 160 to 200 days old,Han sheep and Tan sheep had significant increase in weight(P<0.05).The Han sheep had the highest ADG and RGR,and Mongolia sheep had the lowest.Age had significant effect on the weight of stomach,liver and small intestine(P<0.05). 【Conclusion】 The period between 120 and 160 days old is fastest growth stage for lambs.The growth performance of Han sheep is better than Tan sheep and Mongolia sheep.The growth of pancreas for sheep lambs is earliest among stomach,liver and small intestine. |
| Key words: lamb growth performance digestive organ sheep |
