摘要
The objective of this experiment was to investigate the potential benefits of active dry yeast (ADY) on the growth performance, rumen fermentation, nutrient digestibility, and serum parameters of weaned beef calves. Thirty Simmental crossbred male calves (body weight = 86.47 ± 4.41 kg and 70 ± 4 d of age) were randomly divided into 2 groups: control (CON) (fed basal ration) and ADY (fed basal ration and 5 g/d ADY per calf). The dietary concentrate-to-roughage ratio was 35:65. All the calves were regularly provided rations 3 times a day at 07:00, 13:00, and 19:00 and had free access to water. The experiment lasted for 60 d. The average daily gain of ADY group was higher (P = 0.007) than that of the CON group, and the ratio of feed intake to average daily gain in the ADY group was reduced (P = 0.022) as compared to the CON group. The concentration of ruminal ammonia-N was higher (P = 0.023) in the CON group than that in the ADY group, but an opposite trend of microbial protein was found between the 2 groups. Also, the ruminal concentrations of propionate and butyrate were higher (P < 0.05) in the ADY group than those in the CON group. Calves fed ADY exhibited higher (P < 0.05) crude protein and neutral detergent fiber digestibility. Supplementation of ADY increased (P < 0.05) the contents of glucose, glutathione peroxidase, superoxide dismutase, immunoglobulin A, immunoglobulin M, and interleukin 10 in the serum of calves, but an opposite trend was observed in malondialdehyde, interleukin 1 beta, and tumor necrosis factor alpha contents between the 2 groups. In conclusion, dietary supplementation with ADY could improve the growth performance, rumen fermentation, nutrient digestibility, antioxidant ability, and immune response of weaned beef calves.
摘要译文
该实验的目的是研究活性干酵母（Ady）对断奶牛犊的生长性能，瘤胃发酵，营养消化率和血清参数的潜在益处。三十个Simmental杂交雄性小牛（体重= 86.47±4.41千克和70±4 d）随机分为2组：控制（CON）（FED基础配给）和ADY（喂养基础竞争和5 G / D Ady Ady小牛）。膳食浓缩物至粗糙含量为35:65。所有小牛在07:00，13:00和19:00每天3次定期提供口粮，并免费获得水。实验持续了60天。与CON组相比，ADY组的平均每日增益（P = 0.007）比CON组的较高（p = 0.007），并且与孔组相比，在Ady组中的进料进口到平均每日增益的比率降低（p = 0.022）。在CON组中，瘤胃氨-N的浓度高于该组的浓度（p = 0.023），但在2组之间发现了微生物蛋白的相反趋势。此外，在Ady组中丙酸盐和丁酸盐的瘤胃浓度高于CON组中的含量高（P <0.05）。饲喂Ady的犊牛展示较高（P <0.05）粗蛋白质和中性洗涤剂纤维消化率。补充Ady增加（P <0.05）葡萄糖，谷胱甘肽过氧化物酶，超氧化物歧化酶，免疫球蛋白A，免疫球蛋白M和白细胞介素10的含量，但在丙二醛，白细胞介素1β和肿瘤中观察到相反的趋势2组之间的坏死因子α内容。总之，膳食补充剂可以改善断奶牛犊的生长性能，瘤胃发酵，营养消化，抗氧化能力和免疫应答。
Jian Ma[a];Cheng Wang[a];Zhisheng Wang[a];Guang Cao[a];Rui Hu[a];Xueying Wang[a];Huawei Zou[a];Kun Kang[a][b];Quanhui Peng[a];Bai Xue[a];Lizhi Wang[a];Yueming Zhu[c];Xiaopeng Zhu[c]. Active dry yeast supplementation improves the growth performance, rumen fermentation, and immune response of weaned beef calves[J]. Animal Nutrition, 2021,7(4): 1352-1359