中国畜牧兽医2017，Vol.45Issue(10)：2923-2930,8.DOI:10.16431/j.cnki.1671-7236.2017.10.013
冬季不同饲养密度对湖羊育成公羊生长发育和舍内CO2、NH3浓度的影响
Effects of Different Stocking Density on Growth and Development and CO2, NH3 Concentration of Hu Rams in Winter
摘要
Abstract
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,lⅢ 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 signifi cant 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 group Ⅱ 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.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Key words
Hu growth ram/stocking density/growth performance/slaughter performance/NH3 concentration/CO2 concentration分类
农业科技引用本文复制引用
邓先德,赵欢,秦汉明,宋魁,付秀珍,吴荷群,高永维,张子荣,马长宾,姚守秀,陈文武..冬季不同饲养密度对湖羊育成公羊生长发育和舍内CO2、NH3浓度的影响[J].中国畜牧兽医,2017,45(10):2923-2930,8.基金项目
新疆生产建设兵团重大科技项目(2013AA003-2) （2013AA003-2）
第六师重大科技专项(Z1304) （Z1304）
