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首页> 外文期刊>Journal of dairy science >Effect of dietary energy source and level on nutrient digestibility, rumen microbial protein synthesis, and milk performance in lactating dairy cows
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Effect of dietary energy source and level on nutrient digestibility, rumen microbial protein synthesis, and milk performance in lactating dairy cows

机译：日粮能量来源和水平对泌乳奶牛营养物质消化率，瘤胃微生物蛋白质合成和产奶性能的影响

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摘要

This study was conducted to examine the effects of dietary energy source and level on intake, digestion, rumen microbial protein synthesis, and milk production in lactating dairy cows, using corn stover as a forage source. Eight multiparous Holstein cows, 4 of which were fitted with rumen cannulas, were evaluated in a replicated 4×4 Latin square design, with each period lasting 21 d. The cows were randomly assigned into 4 treatment groups: low-energy (LE) ground corn (GC), LE steam-flaked corn (SFC), high-energy (HE) GC, and HE SFC. Changes to ruminal energy degradation rates were induced by feeding the cows diets of either finely ground corn or SFC as components of diets with the same total energy level. Milk yield, milk protein content and yield, and milk lactose yield all increased in response to higher levels of dietary energy, whereas contents of milk fat and lactose were unaffected. Cows fed HE diets had a higher crude microbial protein yield and total-tract apparent digestibility than those receiving LE diets. Milk yield, milk protein yield, and microbial protein yield were also higher when SFC replaced GC as the main energy source for lactating cows fed LE diets. These results suggest that an increased dietary energy level and ruminal degradation rate are beneficial to milk protein production, which we suggest is due to increased yields of microbial proteins, when cows are fed corn stover as a dietary forage source.
机译：这项研究是利用玉米秸秆作为饲料来源，研究饮食能量来源和水平对泌乳奶牛摄入，消化，瘤胃微生物蛋白质合成和产奶量的影响。用复制的4×4拉丁方形设计评估了8头荷斯坦牛，其中4头装有瘤胃插管，每个周期持续21天。将母牛随机分为4个治疗组：低能（LE）玉米粉（GC），低能蒸汽片状玉米（SFC），高能（HE）GC和HE SFC。瘤胃能量降解率的变化是通过以相同的总能量水平向奶牛饲喂细粉玉米或SFC饲喂的日粮来诱导的。牛奶的产量，牛奶蛋白质含量和产量以及牛奶乳糖的产量都随着日粮能量的增加而增加，而牛奶脂肪和乳糖的含量则不受影响。饲喂高脂日粮的母牛比接受低脂日粮的母牛具有更高的粗微生物蛋白产量和全道表观消化率。当SFC代替GC作为饲喂LE日粮的泌乳牛的主要能源时，牛奶产量，牛奶蛋白质产量和微生物蛋白质产量也更高。这些结果表明，日粮能量水平和瘤胃降解率的提高对牛奶蛋白质的生产是有益的，我们认为这是由于当以玉米秸秆为饲料饲喂日粮时，微生物蛋白质的产量增加。

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  • 来源
    《Journal of dairy science》 |2015年第10期|7209-7217|共9页
  • 作者

    X. Q. Zhou; Y. D. Zhang; M. Zhao; T. Zhang; D. Zhu; D. P. Bu; J. Q. Wang;

  • 作者单位

    College of Animal Science and Technology, Northeast Agricultural University, Harbin 150030, P. R. China,State Key Laboratory of Animal Nutrition, Institute of Animal Science, Chinese Academy of Agricultural Sciences, Beijing, 100193, P. R. China;

    State Key Laboratory of Animal Nutrition, Institute of Animal Science, Chinese Academy of Agricultural Sciences, Beijing, 100193, P. R. China;

    State Key Laboratory of Animal Nutrition, Institute of Animal Science, Chinese Academy of Agricultural Sciences, Beijing, 100193, P. R. China;

    State Key Laboratory of Animal Nutrition, Institute of Animal Science, Chinese Academy of Agricultural Sciences, Beijing, 100193, P. R. China;

    State Key Laboratory of Animal Nutrition, Institute of Animal Science, Chinese Academy of Agricultural Sciences, Beijing, 100193, P. R. China;

    State Key Laboratory of Animal Nutrition, Institute of Animal Science, Chinese Academy of Agricultural Sciences, Beijing, 100193, P. R. China,Synergetic Innovation Center of Food Safety and Nutrition, Harbin, 150030, P. R. China,Chinese Academy of Agricultural Sciences-International Center for Research in Agroforestry, Joint Laboratory on Agroforestry and Sustainable Animal Husbandry, World Agroforestry Centre, East and Central Asia, Beijing 100193, P. R. China,State Key Laboratory of Animal Nutrition, Institute of Animal Science, Chinese Academy of Agricultural Sciences, No. 2 Yuanmingyuan West Road, Haidian District, Beijing, 100193, P. R. China;

    College of Animal Science and Technology, Northeast Agricultural University, Harbin 150030, P. R. China,State Key Laboratory of Animal Nutrition, Institute of Animal Science, Chinese Academy of Agricultural Sciences, Beijing, 100193, P. R. China;

  • 收录信息 美国《科学引文索引》(SCI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    energy; corn stover; microbial protein; nutrient digestibility; lactation performance;

    机译：能源;玉米秸秆;微生物蛋白营养物质消化率;泌乳性能;

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