Effects of Diets with Different Nutrient Levels on Growth Performance,Nutrient Digestion and Antioxidant Property of Anhei Crossbred Cattle
[Objective]This experiment was conducted to study the effects of high and low nutrient level diets on growth performance,nutrient digestion and antioxidant property of Anhei crossbred cattle.[Method]A comparative experimental design was used and twelve healthy Angus(♂)× Black Simmental(♀)cross cattle with similar body weight(206.08 kg±21.87 kg)and age(about 6 months,half male and half female)were randomly divided into two groups with 6 cattle in each group and fed low and high nutrient level diet respectively.The pre-trial and normal trial periods were 12 and 62 days,respectively.The comprehensive net energy(Nemf)of the high nutrient level formula diet in the early(1-31 d)and late(32-62 d)stages were 5.77 and 6.00 MJ/kg,and the crude protein(CP)was 12.47％and 10.44％.The Nemf of the low nutrient level formula diet in the early and late stages were 5.42 and 5.57 MJ/kg,and the CP were 9.66％and 9.05％.Body weight and body size were measured on days 1 and 62.The digestion experiment was done in the last 8 days,and the digestibility of organic matter(OM),CP,ether extract(EE),neutral detergent fiber(NDF)and acid detergent fiber(ADF)were measured.[Result]In whole stage,the average daily gain,average daily feed intake and the abdominal circumference of the cattle in the high nutrient level group were significantly higher than those in the low nutrient level group by 39.09％,22.20％and 6.17％(P＜0.05).The F/G of the high nutrient level group had a lower tendency than that of the low nutrient level group(P=0.087).The digestibility of OM,CP,EE,NDF and ADF of Anhei crossbred cattle was not affected significantly by dietary nutrient levels(P＞0.05).The serum total antioxidant capacity of the cattle in the high nutrient level group was significantly lower than that in the low nutrient level group(P＜0.05),glutathione peroxidase activity and malondialdehyde content were not affected significantly by the treatments(P＞0.05).[Conclusion]In conclusion,compared with the low nutrient level diet,the high nutrient level diet could better promote the growth and development of Anhei crossbred cattle.
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