摘要
试验旨在研究冬季不同舍饲密度对育成公羊生长性能、屠宰性能、内脏器官发育和饲养环境的影响,采用单因素完全随机区组设计,将144只6月龄、体重相近的健康育成公羊随机分为4组,即Ⅰ、Ⅱ、Ⅲ和Ⅳ组,每组6个重复,每个重复6只羊。每组饲养密度分别为0.70、1.05、1.40和1.75 m^2/只,试验期55 d。结果显示:(1)Ⅱ组平均日增重和末重均极显著高于其他组(P<0.01),Ⅲ、Ⅳ组极显著高于Ⅰ组(P<0.01),Ⅱ组体增重最高,分别比Ⅰ、Ⅲ和Ⅳ组高20.27%、11.98%和10.23%(P<0.01),Ⅱ组料重比极显著低于Ⅰ、Ⅲ和Ⅳ组(P<0.01);(2)Ⅱ组宰前活重极显著高于其他组(P<0.01),净肉重、净肉率和肉骨比均显著高于Ⅰ组(P<0.05),而Ⅱ、Ⅲ、Ⅳ组间无显著差异(P>0.05);(3)各组间除心脏和脾脏重有显著差异外,其余各器官重均未表现出显著差异(P>0.05),Ⅳ组心脏和肝脏重占活体重量比最高;(4)舍内的NH_3和CO_2平均浓度大小为:Ⅰ组>Ⅱ组>Ⅲ组>Ⅳ组,与羊饲喂空间大小呈负相关(R^2=-0.995和R2=-0.999);(5)在不计算人工和饲料成本的情况下,Ⅰ、Ⅱ、Ⅲ和Ⅳ组分别获利6 345.67、7971.77、6977.80和7 025.42元,Ⅱ组经济效益最高。综上所述,试验Ⅱ组各项指标均优于其他3组,舍饲育肥羊饲养密度与生长性能的物理性拐点是1.05 m^2/只。
The experiment was conducted to study the effects of different stocking density on growth performance,slaughter performance,organs development and feeding environment of Hu rams in winter.144 healthy and 6 months old Hu rams with similar body weight were randomly divided into 4 groups （groups Ⅰ,Ⅱ,Ⅲ and Ⅳ） with 6 reduplicates per group and 6 sheep per reduplicate. Each sheep in each group covers an area of 0.70,1.05,1.40 and 1.75 m2,respectively,and the experiment period was 55 d. The results showed that：①The final body weight and average daily gain of group Ⅱ were extremely significantly higher than other groups （P 〈 0.01）, that of groups Ⅲ and Ⅳ extremely significantly higher than group Ⅰ （P 〈 0.01）.The body weight gain of group Ⅱ was the highest which were 20.27%,11.98% and 10.23% higher than groups Ⅰ,Ⅲ and Ⅳ,while the F/G of group Ⅱ was extremely significantly lower than other groups （P 〈 0.01）.②The live weight of group Ⅱ was extremely significantly higher than other groups （P 〈 0.01）,and the net meat weight,net meat percentage and ratio of meat to bone were significant higher than group Ⅰ （P 〈 0.05）.③There was no significant difference of organ development among groups （P 〉 0.05）,except heart and spleen,and the ratio of heart and liver weight to live weight of group Ⅳ were the highest.④The variations of NH3 and CO2 concentration during the day and night was basically same in the house. The rank of NH3 and CO2 concentration in all groups were group Ⅰ 〉 group Ⅱ 〉 group Ⅲ 〉 group Ⅳ,which had a negative correlation with the size of sheep fed space （R2=-0.995 and R2=-0.999）.⑤The profits of groups Ⅰ,Ⅱ,Ⅲ and Ⅳ were 6 345.67,7971.77,6977.80 and 7 025.42 yuan,respectively,in which groupⅡ was the highest. In conclusion,the group Ⅱ had the better effects than the other three groups, Therefore,the physical inflection point of stall-feeding density and growth performance of sheep stocking was 1.05 m2/a.
出处
《中国畜牧兽医》
CAS
北大核心
2017年第10期2923-2930,共8页
China Animal Husbandry & Veterinary Medicine
基金
新疆生产建设兵团重大科技项目(2013AA003-2)
第六师重大科技专项(Z1304)
关键词
湖羊育成公羊
饲养密度
生长性能
屠宰性能
NH3浓度
CO2浓度
Hu growth ram
stocking density
growth performance
slaughter performance
NH3 concentration
C02 concentration
