Effects of Improvement Techniques of Nutritional Value of Whole Corn Silage Feed on Growth Performance and Serum Biochemical Indices of Beef Cattle
YANG Zhiling1, WANG Yaru1, FAN Zihan2, YANG Guoyi2, LIU Qi2, HAO Lei2, CAO Mingyu1, TAN Yanan1,3, XU Peng1, DUAN Zengliang1, DUAN Xuehui4, MENG Haijun4, ZHANG Shuanlin1, LIU Qiang1, GUO Gang1
1. College of Animal Science and Veterinary Medicine, Shanxi Agricultural University, Taigu 030801, China;
2. Bureau of Forestry and Grassland of Shanxi Province, Taiyuan 030000, China;
3. Bureau of Rural and Agriculture of Wenshui County, Wenshui 032101, China;
4. Wanmu Technological Co., Ltd., of Shanxi, Qixian 030900, China
Abstract：The objective of this experiment was to study the effects of improvement techniques of nutritional value of whole corn silage feed on growth performance and serum biochemical indices of beef cattle. Sixty Japanese Beef×Angus F1 crossbred steers with an average body weight of (220±12) kg were block into 4 groups with 15 beef in each group. Group 1 were fed a basal diet with whole corn silage as main roughage; group 2 were fed a diet with whole corn silage added silage additives as main roughage, and the supplemental level was 10 g/t; group 3 were fed the group 2 diet added rumen-protected lysine (RPL), and the supplemental level was 8.95 g/d; group 4 were fed the group 3 diet added rumen-protected methionine (RPM), and the supplemental level was 2.98 g/d. The experiment included a pretrial 7 d and a trial 90 d. The results showed as follows:1) the average daily gain in groups 3 and 4 was significantly higher than that in group 1 (P<0.05), dry matter intake had no significant difference among groups (P>0.05), the feed/gain in groups 1 was significantly higher than that in groups 2, 3 and 4(P<0.05), furethemore, the feed/gain in groups 1, 2 was significantly higher than that in groups 3 and 4(P<0.05). 2)The apparent digestibility of crude protein in group 2 was significantly greater than that in group 1 (P<0.01), while the apparent digestibility of crude protein in groups 3 and 4 was significantly greater than that in group 1 (P<0.05), the apparent digestibilities of neutral detergent fiber (NDF) and acidic detergent fiber (ADF) had no significant difference among groups (P>0.05), and the apparent digestibilities of ether extract and nitrogen free extract in groups 2, 3 and 4 was significantly greater than that in group 1 (P<0.01 or P<0.05), respectively. 3)Serum aspertate aminotransferase (AST), alanine amino enzyme (ALT) and carbamyl phosphate synthetase -Ⅰ (CPS-Ⅰ) activities had no significant difference among groups (P>0.05). 4) Plasma urea nitrogen and creatinine contents in groups 3 and 4 were significantly lower than those in group 2 (P<0.05), serum cysteine content in group 4 was significantly lower than that in groups 1 and 2 (P<0.05), however, the other serum biochemical indices had no signicicant difference among groups (P>0.05). 5)The content of growth hormone in serum in groups 3 and group 4 was significantly higher than that in group 1 (P<0.05), and there was no significant difference in other serum hormone indexes among groups (P>0.05). The results indicate that inoculated whole corn silage diet with the addition of RPL alone or RPL和RPM can increase average daily weight gain of beef cattle, and the three improved techniques in this experimemt can increase feed conversion ratio, and inoculated whole corn silage and adding RPL at the same time has better effect for beef cattle.
杨致玲, 王亚茹, 樊子菡, 杨国义, 刘旗, 赫磊, 曹名玉, 谭亚楠, 许鹏, 段增亮, 段学慧, 孟海军, 张拴林, 刘强, 郭刚. 全株玉米青贮饲粮营养价值改进技术对肉牛生长性能及血清生化指标的影响[J]. 动物营养学报, 2020, 32(9): 4148-4157.
YANG Zhiling, WANG Yaru, FAN Zihan, YANG Guoyi, LIU Qi, HAO Lei, CAO Mingyu, TAN Yanan, XU Peng, DUAN Zengliang, DUAN Xuehui, MENG Haijun, ZHANG Shuanlin, LIU Qiang, GUO Gang. Effects of Improvement Techniques of Nutritional Value of Whole Corn Silage Feed on Growth Performance and Serum Biochemical Indices of Beef Cattle. Chinese Journal of Animal Nutrition, 2020, 32(9): 4148-4157.
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