Effects of partial whole plant silage corn replaced by millet straw silage on serum biochemical indexes,nutrient apparent digestibility and fattening benefit of Simmental crossbred cattle
The purpose of this experiment was to study the effects of millet straw micro-storage on weight gain,feed conversion rate,nutrient apparent digestion and serum biochemical indexes of beef cattle.Hirty-six Simmental hybrid bulls with body weight of about 570 kg and good body condition were randomly divided into 4 groups,9 in each group.The the control group was composed of 60%whole plant corn silage+40%straw,and the experimental groups replaced 10%,20%and 30%whole plant corn silage,respectively.The proportion of straw remained unchanged,and the composition and feeding ratio of concentrate were consistent.The pre-feeding period was 10 days and the feeding period was 60 days.The results showed that compared with the control group,the serum total protein(TP)content of the experimental group 1,2 and 3 increased by 52.09%,54.95%and 52.46%,respectively(P<0.05).Serum albumin(ALB)content increased by 67.15%,67.38%and 74.39%,respectively(P<0.05).The activity of glutathione peroxidase(GSH-Px)in group 2 was increased by 22.77%(P<0.05).The apparent digestibility of crude protein in group 1,2 and 3 increased by 53.48%,32.48%and 43.90%,respectively(P<0.05).The apparent digestibility of crude fiber increased by 20.81%,37.95%and 39.15%,respectively(P<0.05).The apparent digestibility of acid detergent fiber(ADF)increased by 45.79%,72.09%and 67.68%,respectively(P<0.05).The apparent digestibility of neutral detergent fiber(NDF)in the experimental group 2 was 27.19%higher than that in the control group(P<0.05).The results indicated that replacing part of the whole plant corn silage with millet grass silage in the diet to feed Simmental crossbred beef cattle could increase feed intake,promote protein metabolism and improve the antioxidant capacity of the body.The replacement ratio of 10%～20%could obtain better fattening effect and economic benefits.
millet straw microstorageXiza beef cattlefatteningserum indicatorsapparent digestibility of nutrients
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