Effect of corn gluten meal replacing soybean meal on growth performance,nitrogen metabolism,and slaughtering performance of beef cattle
This experiment aims to investigate the effects of corn gluten meal(CGM)replacing soybean meal on the growth performance,nitrogen metabolism,and slaughter performance of beef cattle.96 healthy and disease-free Simmental beef cattle weighing around 370 kg were selected and randomly divided into 4 groups,with 3 replicates in each group and 8 cows in each replicate.The CON group was fed a full mixed diet according to the beef cattle feeding standards(NY/T 815-2004),and the other three groups were added with 2.5%(CGML group),5.0%(CGMM group),and 7.5%(CGMH group)of corn gluten meal(nitrogen replacement soybean meal)to the full mixed diet,respectively.The experiment lasted for 80 days.The results showed that:(1)Compared with the CON group,the CGMH group significantly reduced the final weight and average daily gain of beef cattle(P＜0.05),while the feed to weight ratio significantly increased(P＜0.05).Among the four groups,the CGML group had the highest final weight and average daily gain,while the feed to weight ratio was the lowest.(2)Compared with the CON group,the CGMM and CGMH groups significantly reduced the deposition nitrogen and nitrogen utilization efficiency of beef cattle(P＜0.05),while the CGML group had higher deposition nitrogen and nitrogen utilization efficiency than the CON group,but there was no significant difference(P＞0.05).(3)Compared with the CON group,the live weight before slaughter,carcass weight,and net meat weight of CGMH group beef cattle were significantly reduced(P＜0.05).Among the four groups,the CGML group had the highest live weight,carcass weight,and net meat weight before slaughter.Conclusion:Based on various indicators,without considering feed costs,the appropriate level of corn gluten meal addition in beef cattle's total mixed diet is 2.5%.
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