摘要
用6头约克夏和10头汉普夏、杜洛克、丹麦伦德瑞斯共36头小公猪,在其20—100kg 生长阶段内分期进行氮—碳平衔试验和呼吸测热试验各180头次。结果表明,生长公猪每千克代谢体重(W^(0.75))所需的维持能量与体重的一定的幂的倒数成比例。当代谢能转化为体蛋白质能和体脂肪能的效率[k_p和k_f]为0.60和0.80,0.68和0.75,0.56和0.74时,每千克代谢体重所需的维持能量分别为1131W^(-0.20),1307W^(-0.23)和1235W^(-0.25)千焦代谢能或1173W^(-0.20),1356W^(-0.23)和1281W^(-0.25)千焦消化能。建议用 ME_m,KJ/W^(0.75),kg=1307W^(-0.23),kg 作为生长公猪维持需要的公式。
Three series of experiments were carried out with 10 Hampshire,10 Duroc,10 Danish Landrace and 6 Yorkshire growing boars,to measure energy requirement for maintenance.From 20—100kg live weight each animal was measured in 5 periods.A total of 180N—C balance and respiration experiments were conducted.Results indicated the energy re- quirement for maintenance per unit metabolic weight(W^(0.75))in growing boars was mot a constent value as adult animals, but a function of live weight,could be expressed as a=cW^(-d).The value of“a”was 1131 W^(-0.20),1307W^(-0.23), 1235W^(-0.25)kj.ME or 1173W^(-0.20),1356W^(-0.23),1281W^(-0.25)kj.DE when the efficiency of ME for protein and fat deposi- tion(k_p,k_f)were 0.6,0.8;0.68,0.75 and 0.56,0.74 respectively.It is suggested to use ME_m,kj/W^(0.75),k_s= 1307W^(-0.23)as a model for predicting of the requirement for maintenance in growing boars.
关键词
生长公猪
维持需要
能量
Growing boars
Maintenance requirement
Energy
