摘要
为研究饲粮中添加木质纤维素复合酶(CE)和包被木质纤维素复合酶(CCE)对荷斯坦奶牛生产性能和瘤胃发酵的影响。选用36头荷斯坦奶牛,按随机区组设计分为对照组、CE组、CCE组和MCE组,分别饲喂基础饲粮、基础饲粮+CE 15 g/d、基础饲粮+CCE 15 g CE/d、基础饲粮+CE 7.5 g/d+CCE 7.5 g CE/d。结果显示:鲜乳产量、乳脂校正乳产量、乳脂和乳真蛋白质产量,CE组与MCE组显著高于对照组(P<0.05);MCE组饲料效率显著高于对照组(P<0.05);饲粮干物质、有机物、粗蛋白、粗脂肪、中性洗涤纤维和酸性洗涤纤维表观消化率,CE、CCE组和MCE组显著高于对照组(P<0.05);CE组与MCE组瘤胃液总挥发性脂肪酸含量显著高于对照组(P<0.05);CE组与MCE组乙酸/丙酸值显著低于对照组和CCE组(P<0.05);CE、CCE组和MCE组氨态氮浓度显著低于对照组(P<0.05)。综上所述,饲粮中添加CE能提高荷斯坦奶牛泌乳性能,促进瘤胃发酵和养分消化;CE的最佳添加方式是包被与不包被等比例混合。
This study investigated the effects of cellulolytic enzymes mixture supplementation(CE)and coated cellulolytic enzymes mixture(CCE)supplementation on production performance and ruminal fer⁃mentation in Chinese Holstein dairy cows.Thirty-six Chinese Holstein dairy cows were assigned with a randomized block design into four treatments:control(basic diet),CE(basic diet+CE 15 g/d),CCE(basic diet+CCE 15 g CE/d)and MCE(basic diet+CE 7.5 g/d+CCE 7.5 g CE/d).The results showed that the yields of fresh milk,fat corrected milk,milk fat and milk true protein were higher in CE and MCE than those in control(P<0.05).Feed efficiency was greater for MCE than that for the control(P<0.05).Dietary CE,CCE or MCE supplementation increased the apparent digestibility of dry matter,organic matter,crude protein,ether extract,neutral detergent fibre and acid detergent fibre(P<0.05).The total volatile fatty acids concentration was greater for CE and MCE than that for the control(P<0.05).Comparing with the control and CCE,cows in the CE and MCE had lower acetate to propionate ratio(P<0.05).Ruminal ammonia N content was lower in CE,CCE and MCE than that in the control(P<0.05).The data indicat⁃ed that dietary CE supplementation improved lactation performance,ruminal fermentation and nutrient di⁃gestion,and the optimum supplementation mode was the mixture of CE and CCE in equal proportion.
作者
许博文
刘强
王聪
郭刚
霍文婕
张静
XU Bowen;LIU Qiang;WANG Cong;GUO Gang;HUO Wenjie;ZHANG Jing(College of Animal Science,Shanxi Agricultural University,Shanxi Taigu 030801,China)
出处
《饲料工业》
CAS
北大核心
2022年第15期45-49,共5页
Feed Industry
基金
山西省重点研发计划项目[201903D211012]
山西省现代农业产业技术体系建设项目[2020-11]。
关键词
木质纤维素复合酶
奶牛
泌乳性能
养分消化
瘤胃发酵
cellulolytic enzyme complex
dairy cow
lactation performance
nutrient digestion
rumen fermentation
