日粮代谢能水平对青山羊母羊泌乳量及羔羊增重的影响

选用18只青山羊泌乳母羊及其羔羊随机分成3组,分别按推荐量的120%,100%和80%供给代谢能(ME),进行前后两期共70天的饲养试验,结果证明:(1)在本试验3个能量水平下,青山羊泌乳母羊在整个泌乳期内体重无明显变化(P>0.5),母羊泌乳量受日粮ME 水平的影响,一定范围内,提高日粮 ME 水平可增加泌乳量。(2)青山羊母羊的平均泌乳量为575±74gFCM/只天,某日或整个泌乳期的泌乳量可用下式预测:Y= dx(Y:泌乳量,g/d;x:日龄)。(3)要保证母羊较高的泌乳量和羔羊最大日增重,理想的日粮 ME 水平分别为前期10680kJ/kgDM 和后期9372kJ/kgDM。(4)母羊 ME 水平不同可明显影响羔羊日增重和断奶体重;双羔中任一羔羊在哺乳期内的日增重(△W)可根据母羊泌乳量(M)用下式估计:△W(g/d)=16.962+0.0712·M(g/d)

EFFECTS OF METABOLIZABLE ENERGY LEVELSIN DIET ON MILK YIELD OF SHE--GOATS AND WEIGHT GAIN OF SUCKLING KIDS

Feeding experiments in the earlier lactation period(from the day of parturition to the 30th day of lactation)and the later lactation period(from the 31th to 70th day)were con- ducted by randomly dividing 18 lactating grey goats,each suckling two kids,into 3 groups and each fed one of 3 levels of metabolizable energy(120%,100% and 80% of prelimary recommended content).The results showed that:(1)No significant difference was found in the body weight of the she-goats during the whole lactation(p>0.05).To some extent,the milk yield of the goats could be increased with the increasing of metabolizable energy(ME) level in diet.(2)The average milk yield was 575+or-74g fat corrected milk per day.(3)To get the highest milk yield of the goats and weight gain of the kids,the suitable ME level of diet in the earlier and later lactation periods would be 10680 and 9370 KJ/kgDM, respectively.(4)ME levels of she-goat diets significantly affected the gain and weaning weights of the kids during suckling period.