紫花苜蓿干草与全株玉米替代部分精料对育成牛生长性能和经济效益的影响OA

This experiment was conducted to study the effects of adding alfalfa hay and whole plant corn si-lage to replace part of concentrate on the growth performance and economic benefits of growing cattle.Six-teen crossbred(F1)weaned bulls(Black Angus♀×Simmental♂)with 210 days of age,196.5-208.88 kg of body weight and good health were randomly divided into 4 groups.They were fed 22.86％concentrate+77.14％hybrid Pennisetum(N1,CK),11.43％alfalfa hay+17.14％whole plant corn silage+11.43％con-centrate+60％hybrid Pennisetum(N2),17.14％alfalfa hay+11.43％whole plant corn silage+11.43％concentrate+60％hybrid Pennisetum(N3)and 22.86％alfalfa hay+5.71％whole plant corn silage+11.43％concentrate+60％hybrid Pennisetum(N4),respectively.The experiment lasted for 90 days.The results showed that there was no significant difference in initial body weight,final body weight and average daily feed intake among the treatments(P＞0.05).The average daily gain of N2,N3 and N4 was 15.38％,37.18％and 32.05％higher than that of CK,respectively,and the difference between N3 and N4 and CK was significant(P≤0.05).The feed-to-weight ratio of N3 and N4 was significantly lower than that of CK(P≤0.01).During the experiment,there was no significant difference in total feed intake between treat-ments(P＞0.05),but the total weight gain of N3 and N4 was significantly higher than that of CK(P ≤0.05).The feed cost per unit of gain of N2,N3 and N4 was significantly lower than that of CK(P≤0.05),and the gross profit of N3 and N4 was significantly higher than that of CK(P ≤ 0.05).According to the comprehensive analysis,the daily addition of 17.14％alfalfa hay and 11.43％whole plant corn silage repla-cing 50％of the concentrate(treatment N3)to feed growing cattle could significantly improve its produc-tion performance and obtain higher economic benefits.