20~35kg川中黑山羊公羊能量需要量研究

Study on Energy Requirements of 20 to 35 kg ChuanzhongBlack Male Goats

本试验旨在研究20~35 kg川中黑山羊公羊的能量需要量,为川中黑山羊的科学饲养提供营养需要参数。采用比较屠宰试验法,选择2.5月龄、体重(19.97±5.47)kg的健康断奶川中黑山羊去势公羔22只,试验开始时屠宰4只,其余18只羔羊分为3个饲喂水平组(每组6只羊):自由采食组(AL组)、75%自由采食组(AL75组)、60%自由采食组(AL60组)。试验羊单笼单饲,试验期96 d。在饲养试验结束前4 d开展消化代谢试验,收集全粪全尿。当AL组试验羊平均体重达到35 kg时结束饲养试验,每组选取接近该组平均体重的4只羊(共12只)进行屠宰,屠体冷冻保存待测。结果表明:1)20~35 kg生长川中黑山羊维持净能需要量(NE m)为178.24 kJ/(kg BW 0.75·d),维持代谢能需要量(ME m)为263.74 kJ/(kg BW 0.75·d),代谢能维持利用效率(k m)为0.68。2)日增重100~300 g/d的川中黑山羊的生长净能需要量(NE g)为0.99~3.71 MJ/d,生长代谢能需要量(ME g)为3.15~11.78 MJ/d,代谢能生长利用效率(kg)为0.31。本研究可为我国地方品种肉羊饲养标准的健全提供数据参考。

This experiment was conducted to study the energy requirements of 20 to 35 kg Chuanzhong black male goats,to provide nutritional requirements parameters for scientific breeding of Chuanzhong black goats.Using a comparative slaughter test method,twenty-two 2.5-month-old Chuanzhong black goat male kids with body weight of(19.97±5.47)kg were selected,four lambs were slaughtered at the beginning of the experiment,and other eighteen lambs were divided into 3 feeding level groups(six lambs in each group):ad libitum feeding group(AL group),75%ad libitum feeding group(AL75 group)and 60%ad libitum feeding group(AL60 group).The experimental goats were fed in a single cage,and the experiment lasted for 96 days.The digestive and metabolic experiment was conducted at 4 days before the end of the feeding experiment,and whole feces and urine were collected.the feeding experiment was ended when the body weight of experimental goats of AL group reached 35 kg,four goats in each group were selected and slaughtered,and the carcass was frozen to be tested.The results showed as follows:1)the maintenance net energy requirement of 20 to 35 kg Chuanzhong black goats was 178.24 kJ/(kg BW 0.75·d),the maintenance metabolic energy requirement was 263.74 kJ/(kg BW 0.75·d),and the metabolic energy maintenance and utilization efficiency(k m)was 0.68.2)The net energy requirement for growth of 20 to 35 kg Chuanzhong black goats with daily weight gain of 100 to 300 g/d was 0.99 to 3.71 MJ/d,the metabolic energy requirement for growth was 3.15 to 11.78 MJ/d,and the metabolic energy growth and utilization efficiency was 0.31.This study can provide data reference for the improvement of local breed meat and sheep breeding standards in China.