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

doi:10.16431/j.cnki.1671-7236.2017.10.013

Abstract

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,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.

Key words: Hu growth ram; stocking density; growth performance; slaughter performance; NH₃ concentration; CO₂ concentration

CLC Number:

S815.4

DENG Xian-de, SONG Kui, FU Xiu-zhen, WU He-qun, GAO Yong-wei, ZHANG Zi-rong, MA Chang-bin, YAO Shou-xiu, CHEN Wen-wu, ZHAO Huan, QIN Han-ming. Effects of Different Stocking Density on Growth and Development and CO₂,NH₃ Concentration of Hu Rams in Winter[J]. , 2017, 44(10): 2923-2930.

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Effects of Different Stocking Density on Growth and Development and CO₂,NH₃ Concentration of Hu Rams in Winter

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Effects of Different Stocking Density on Growth and Development and CO2,NH3 Concentration of Hu Rams in Winter

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Effects of Different Stocking Density on Growth and Development and CO₂,NH₃ Concentration of Hu Rams in Winter