日粮添加产朊假丝酵母对15月龄新疆褐牛杂交育肥增重性能的影响

为探讨日粮添加产朊假丝酵母菌(Candida utilis)对肉牛育肥增重性能的影响,选取15月龄体重(376.53±30.31)kg的新疆褐牛与哈萨克牛杂交F1代公牛30头,随机分为对照组(CT)与产朊假丝酵母菌组(CU),CT组饲喂全混合日粮(TMR),CU组在TMR中按10 g/100 kg体重添加产朊假丝酵母菌...

Effects of Dietary Supplementation with Candida utilis on Fattening Performance of 15-Month-Old Xinjiang Brown Cattle Fattening

To investigate the effect of dietary supplementation with Candida utilis on fattening and weight gain performance of beef cattle,30 F1 bulls of 15-month-old Xinjiang brown cattle and Kazakh cattle were selected and randomly divided into control groups(CT)and Candida utilis group(CU),CU group added 10 g/100 kg body weight dose of Candida utilis powder in total mixed diet(TMR)(live bacteria count≥4×109 CFU/g).The feeding period is 120 days.The particle size and weight change of the remaining TMR are measured every 30 days,and the size distribution of the fecal sample was analyzed by using a manure screen.The results show that with the proportion of TMR feeding formula and the production particle size unchanged,with the extension of the fattening period,the ratio of the first layer of Binzhou sieve(particle size>19 mm)decreases,indicating that the CU group can increase the length of beef cattle.Rough feed intake;15-month-old beef cattle body weight change showed a linear growth pattern with feeding days;The average dry matter intake(DMI)of the CU group was reduced by 9.9%compared with the CT group(P<0.05);the CU group The average feed weight gain ratio(F/G)decreased by 15.4%(P<0.05)compared with the CT group.There was no significant difference in ADG but there was an increase,indicating that the CU group can improve feed conversion efficiency;The CU group has high carcass weight 4.2%in CT group(P<0.05),but there was no significant difference in slaughter rate;Using fecal sieve to analyze the size of feces in CU group and CT group,the ratio of middle and upper layers decreased,indicating that CU group beef cattle digested feed particles in TMR more fully.In summary,dietary supplementation with Candida utilis can increase the intake of 15-month-old beef cattle on TMR medium fiber,DMI decreased by 9.9%,F/G decreased by 15.4%,carcass weight increased by 4.2%,and feed conversion efficiency was improved significantly.