论文部分内容阅读
本文旨在研究不同饲喂水平对20～35 kg杜寒杂交公羔的生长性能、屠宰性能和器官指数的影响。采用单因素完全随机区组试验设计,将21只平均体重为(19.14±2.37)kg公羔随机分为3组,按照自由采食(AL组)、自由采食量的70%(IR70组)和自由采食量的40%(IR40组)3个水平饲喂,每组7只羊,每只羊为1个重复。当AL组的试验羊体重达到35 kg时进行屠宰试验,测定生长性能、屠宰性能及重要内脏器官的重量和发育情况。试验期66 d。结果表明:不同的饲喂水平对净增重、平均日增重和干物质采食量有显著的影响(P<0.05),生长性能和部分屠宰指标表现为相同的变化规律,即AL组>IR70组>IR40组,3组之间差异显著(P<0.05);屠宰率、净肉率和胴体净肉率组间无显著性差异(P>0.05);AL组瘤胃重占复胃总重比例最高,为67.08%,与IR70组差异不显著(P>0.05);肝脏重占宰前活重比例以AL组最高,显著高于IR70和IR40组(P<0.05)。结果提示,饲喂水平对肉用绵羊生长性能、复胃的重量与发育、主要生理器官的发育具有不同程度的影响;本试验结果与NRC(2007)肉羊的饲养标准有一定的差距。
The aim of this study was to investigate the effects of different feeding levels on growth performance, slaughter performance and organ index of 20-35 kg Duhye hybrid lambs. A total of 21 male lambs with an average body weight of (19.14 ± 2.37) kg were randomly divided into three groups according to the single-factor randomized block design. According to the free-to-eat (AL) group, 70% of the free intake (IR70 group) And 40% of free intake (IR40 group) were fed at 3 levels with 7 sheep per group and 1 replicate per sheep. The slaughter test was performed when the body weight of the test sheep in the AL group reached 35 kg, and the growth performance, slaughter performance, weight and development of important internal organs were measured. Test period 66 d. The results showed that different feeding levels had a significant effect on net gain, average daily gain and dry matter intake (P <0.05), and growth performance and partial slaughter index showed the same change pattern, ie AL group> IR70 group> IR40 group, the difference between the three groups was significant (P <0.05); there was no significant difference between the slaughter rate, net meat yield and carcass net meat percentage (P> 0.05) The highest proportion was 67.08%, which was not significantly different from that of IR70 group (P> 0.05). The ratio of liver weight to pre-slaughter weight was the highest in AL group and significantly higher than those in IR70 and IR40 groups (P <0.05). The results suggested that the feeding level had different effects on the growth performance, the weight and development of the stomach, the development of the main organs and the development of the meat. The results of this experiment had a certain gap with the feeding standards of the NRC (2007) sheep.