Effects of different silage on slaughter performance,serum biochemical indices and liver lipid metabolism of Angus beef cattle
To explore the effects of different silage feed on the slaughter performance,serum biochemical indicators,and liver lipid metabolism of Angus beef cattle.45 Angus bulls of similar age and weight(567.68±23.62)kg were selected and divided into 3 groups,with 15 replicates in each group and 1 head per replicate.The experimental feed consisting of silage corn,alfalfa,and sorghum was fed separately for a total of 80 days(8 days for pre trial and 72 days for regular trial).Compared with the corn silage group,the alfalfa silage group significantly increased FBW by 4.00%,ADG by 19.28%,and the feed to weight ratio by 13.23%(P＜0.05);The kidney fat rate and greater omentum fat rate of beef cattle in the alfalfa silage group were significantly higher than those in the corn silage group and sorghum silage group(P＜0.05);In addition,different silages had no significant effects on the carcass weight,slaughter rate,heart fat percentage,net meat weight,net meat percentage,and eye muscle area of beef cattle(P＞0.05).The serum glucose content of beef cattle in the alfalfa silage group was significantly higher than that in the corn silage and sorghum silage groups(P＜0.05);The serum triglyceride content of beef cattle in the alfalfa silage group was significantly lower than that in the corn silage and sorghum silage groups(P＜0.05);The total serum protein content of beef cattle in the alfalfa silage and sorghum silage groups was significantly higher than that in the corn silage group(P＜0.05);In addition,different silages had no significant effect on the serum total cholesterol,globulin,albumin,high-density lipoprotein,and low-density lipoprotein content of Angus beef cattle(P＞0.05).The expression level of FAS gene in the liver of beef cattle in the alfalfa silage group was significantly higher than that in the corn and sorghum silage groups(P＜0.05);The expression level of CPT1 gene in the liver of beef cattle in the alfalfa silage group and sorghum silage group was significantly higher than that in the corn silage group(P＜0.05);PPAR of alfalfa silage group beef cattle liver-γ The gene expression level was significantly higher than that of maize and sorghum silage groups(P＜0.05);In addition,different silages had no significant effect on the expression of LPIN1 gene in beef cattle liver(P＞0.05).(Experimental conclusion)The data from this experiment shows that alfalfa silage can increase lipid deposition in Angus beef cattle.Under the conditions of this experiment,it is believed that alfalfa silage has the best fattening effect on Angus beef cattle.
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