Effects of Microbial Fermented Feed on Rumen Fermentation Function of Dairy Cows and Nutrient in Vitro Digestibilities of Diets
XU Zixuan1,2, LI Dongfang1,2, YU Chunwei1,2, LI Songjian1,2, GAO Min3, HU Honglian3, LIU Dacheng1,2
1. College of Veterinary, Inner Mongolia Agricultural University, Hohhot 010018, China;
2. Key Laboratory of Clinical Diagnosis and Treatment Technology in Animal Disease, Ministry of Agriculture, Hohhot 010018, China;
3. Research Institute of Animal Nutrition and Feed, Inner Mongolia Academy of Animal Sciences, Hohhot 010031, China
Abstract:This experiment was conducted to study effects of different supplemental levels of microbial fermentation feed on rumen fermentation function of dairy cows using an in vitro method, to determine the optimum supplemental level. On this basis, we further discussed the effects of microbial fermentation feed on nutrient in vitro digestibilities of diets. The experiment used an in vitro fermentation method, the concentrate-to-forage ratio of culture substrate was 5:5, and the microbial fermentation feed supplemental levels were 0 (control group), 3% , 5% , 7% and 9%, respectively. The results showed as follows: 1) the gas production and mean concentrations of total volatile fatty acid (TVFA), acetic acid, propionic acid, butyric acid, ammonia nitrogen (NH3-N), bacterial protein (BCP) of 7% group were significantly higher than those of the control group (P<0.05), and the optimum supplemental level of microbial fermentation feed was 7%. 2) Adding 7% microbial fermentation feed increased the in vitro dry matter digestibility (IVDMD), in vitro crude protein digestibility (IVCPD), in vitro neutral detergent fiber digestibility (IVNDFD) and in vitro acid detergent fiber digestibility (IVADFD), compared with the control group increased by 0.80%, 1.43%, 3.76% and 1.98%, respectively. In conclusion, dietary 7% microbial fermentation feed can promote the rumen fermentation function, improve the nutrient in vitro digestibilities of diets.
徐子萱, 李冬芳, 于春微, 李松建, 高民, 胡红莲, 刘大程. 微生物发酵饲料对奶牛瘤胃发酵功能及饲粮营养物质体外消化率的影响[J]. 动物营养学报, 2021, 33(3): 1513-1522.
XU Zixuan, LI Dongfang, YU Chunwei, LI Songjian, GAO Min, HU Honglian, LIU Dacheng. Effects of Microbial Fermented Feed on Rumen Fermentation Function of Dairy Cows and Nutrient in Vitro Digestibilities of Diets. Chinese Journal of Animal Nutrition, 2021, 33(3): 1513-1522.
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