作 者：
林静;赵鑫源;康坤;都文;曹志军;王雅晶;胡骏鹏;余雄;李胜利
单 位：
新疆农业大学动物科学学院;安琪酵母股份有限公司
关键词：
荷斯坦泌乳牛;活性干酵母;生产性能;瘤胃发酵;营养物质表观消化率
摘 要：
本试验旨在研究不同浓度的活性干酵母对荷斯坦泌乳牛生产性能、瘤胃发酵参数及营养物质表观消化率的影响。选择体重、胎次、泌乳天数、产奶量相近的45头荷斯坦泌乳牛,随机分为3个处理组,Ⅰ_0、Ⅱ_2、Ⅲ_5组分别在基础日粮中添加0、2、5 g/(d·头)活性干酵母(活细胞数≥200亿个/g)。试验预试期7 d,正试期60 d。结果表明:与Ⅰ_0组相比,Ⅲ5组泌乳牛的干物质采食量、产奶量、4%乳脂校正乳、乳脂产量分别显著提高1.23、0.99、1.92 kg/d和7.2%(P<0.05),各处理组间其他乳成分无显著差异(P>0.05);奶牛瘤胃总挥发性脂肪酸、乙酸和丁酸浓度未受活性干酵母的显著影响(P>0.05),但与Ⅰ_0组相比,Ⅲ_5组奶牛瘤胃内丙酸浓度显著增加(P<0.05),从而使得乙酸/丙酸显著降低(P<0.05);活性干酵母有提高奶牛干物质(P=0.20)、粗蛋白(P=0.17)中性洗涤纤维(P=0.40)和酸性洗涤纤维(P=0.25)的表观消化率的趋势。综上所述,奶牛日粮中添加5 g/(d·头)活性干酵母可促进瘤胃丙酸型发酵,降低乙酸/丙酸,显著提高奶牛的采食量、产奶量和乳脂产量,具有明显的经济效益优势。
译 名：
Effects of Active Dry Yeast on Production Performance, Ruminal Fermentation and Nutrient Apparent Digestibility of Lactating Holstein Dairy Cow
作 者：
LIN Jing;ZHAO Xin-yuan;KANG Kun;DU Wen;CAO Zhi-jun;WANG Ya-jing;HU Jun-peng;YU Xiong;LI Sheng-li;College of Animal Science, Xinjiang Agricultural University;State Key Laboratory of Animal Nutrition, Beijing Engineering Technology Research Center of Raw Milk Quality and Safety Control, College of Animal Science and Technology, China Agricultural University;AYEAST CO.,LTD;
单 位：
College of Animal Science, Xinjiang Agricultural University%State Key Laboratory of Animal Nutrition, Beijing Engineering Technology Research Center of Raw Milk Quality and Safety Control, College of Animal Science and Technology, China Agricultural University
关键词：
Lactating Holstein dairy cow;;Active dry yeast;;Production performance;;Ruminal fermentation;;Nutrients apparent digestibility
摘 要：
The experiment was conducted to investigate the effects of dietary supplementation of different active dry yeast(Saccharomyces cerevisiae)levels on production performance, nutrient digestibility, serum indices and ruminal fermentation of lactating dairy cows. A total of Forty-five healthy Chinese Holstein lactating dairy cows were randomly assigned into 3 groups with 15 cows in each group based on the similar weight, parity, milk yield, lactation days and the content of milk, namely the control group Ⅰ_0 without ADY supplementation, trial group Ⅱ_2 with 2 g/d and trial group Ⅲ_5 with 5 g/d respectively, All diets were provided as TMR.The feeding trail period was 60 d, the pre-experimental period was 1 week. The results showed as fellows: compared with the control group Ⅰ_0, the dry matter intake, milk yield, 4% fat correction milk production in trial group Y5 increased 1.23 kg/d, 0.99 kg/d, 1.92 kg/d and 7.2% respectively(P<0.05);Compared with group Ⅰ_0, group Ⅲ_5 could significantly increase DMI, milk yield, 4% fat correction milk production and milk fat yield 1.23 kg, 0.99 kg, 1.92% and 7.2% respectively(P <0.05); while others milk composition between each treatment group had no significant difference(P>0.05); There was no remarkable effects of feeding active dry yeast on rumen total VFA, acetate and butyrate concentration(P>0.05); compared with control group, the content of propionate in rumen fluid of trial group Ⅲ_5 significantly increased(P<0.05), while the ration of acetate and propionate decreased(P<0.05);Active dry yeast had the potential to improve the apparent digestibility of DM(P=0.20), CP(P=0.17), NDF(P=0.40) and ADF(P=0.25). In conclusion, 0.025% active dry yeast can be used for dairy cows to promote the propionate fermentation in the rumen, decrease the ration of acetate and propionate, improve the energy utilize efficiency, DMI, milk performance and fat yield of lactating Holstein dairy cow, which has an economic benefit.
