Effects of Dietary Different Neutral Detergent Fiber Sources on Growth Performance, Digestion and Metabolism and Serum Biochemical Indexes of Holstein Male Calves
MA Manpeng1,2, WANG Bing1,3, TU Yan1, BI Yanliang1, FU Tong4, CHENG Shuru2, DIAO Qiyu1
1. Key Laboratory of Feed Biotechnology of Ministry of Agriculture, Feed Research Institute, Chinese Academy of Agricultural Sciences, Beijing 100081, China;
2. College of Animal Science and Technology, Gansu Agricultural University, Lanzhou 730070, China;
3. College of Animal Science and Technology, China Agricultural University, Beijing 100193, China;
4. College of Animal Husbandry and Veterinary Science, Henan Agricultural University, Zhengzhou 450002, China
Abstract：The aim of this study was to investigate the effects of total mixed ration with different neutral detergent fiber (NDF) sources of alfalfa hay (AH) and soybean hulls (SH) on growth performance, digestion and metabolism and serum biochemical indexes of Holstein male calves at the same dietary NDF level. Thirty Holstein male calves at 105 days of age were selected and divided into 2 groups according to the randomized block design, and with 15 calves in each group, feeding total mixed ration with AH and SH as NDF source, respectively. The pre-experimental period lasted for 15 days, and the experimental period lasted for 60 days. The results showed as follows:1) during the whole experimental period (120 to 180 days of age), the ratio of feed to gain of calves of SH diet group was significantly lower than that of AH diet group (P<0.05); during 120 to 135 days of age, the average daily gain of calves of SH diet group was significantly higher than that of AH diet group (P<0.05). 2) On 170 days of age, the fecal output, fecal energy, urine energy, methane energy and fecal nitrogen of calves of SH diet group were significantly lower than those of AH diet group (P<0.05), the apparent digestibilities of dry matter, organic matter, NDF and acid detergent fiber of calves of SH diet group were significantly higher than those of AH diet group (P<0.05), the gross energy apparent digestibility, gross energy metabolism rate, digestive energy metabolic rate, retained nitrogen, nitrogen deposition rate and nitrogen apparent digestibility of calves of SH diet group were significantly higher than those of AH diet group (P<0.05). 3) On 180 days of age, the serum β-hydroxybutyric acid content of calves of SH diet group was significantly lower than that of AH diet group (P<0.05). In summary, the SH is a good source of NDF for Holstein male calves during 120 to 180 days of age, compared with AH diet, SH diet can promote the nutrient apparent digestibility and utilization rate of energy and nitrogen of calves.
马满鹏, 王炳, 屠焰, 毕研亮, 付彤, 成述儒, 刁其玉. 不同中性洗涤纤维来源饲粮对荷斯坦公犊牛生长性能、消化代谢和血清生化指标的影响[J]. 动物营养学报, 2019, 31(6): 2682-2692.
MA Manpeng, WANG Bing, TU Yan, BI Yanliang, FU Tong, CHENG Shuru, DIAO Qiyu. Effects of Dietary Different Neutral Detergent Fiber Sources on Growth Performance, Digestion and Metabolism and Serum Biochemical Indexes of Holstein Male Calves. Chinese Journal of Animal Nutrition, 2019, 31(6): 2682-2692.
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