添加复合缓冲剂对高精料饲喂泌乳奶山羊乳品质的改善及机制

发布时间：2018-05-29 22:28

本文选题：复合缓冲剂 + 泌乳奶山羊　；参考：《食品科学》2017年01期

【摘要】：目的:探讨复合缓冲剂对高精料饲喂泌乳期奶山羊乳品质及机体健康状态的影响。方法:选取8只体质量接近的泌乳中期萨能奶山羊,随机分为高精料组(high concentrate diet group,HG)(精粗质量比60∶40)和缓冲剂组(buffering concentrate group,BG)(高精料中添加复合缓冲剂)。实验共20周,每周统计奶山羊产乳量,每周检测乳成分含量;至第19周,采集瘤胃液和血液样品,测定瘤胃液p H值及脂多糖(lipopolysaccharides,LPS)含量及血液中相关生化指标。结果:与HG相比,BG的奶山羊平均日产乳量、乳中乳蛋白率、乳脂率及乳糖含量都高于HG,其中乳脂率显著高于HG(P0.05)。HG奶山羊瘤胃p H值一直低于BG,且出现了亚急性瘤胃酸中毒症状,其中瘤胃液中LPS含量极显著高于BG(P0.01);生化指标检测结果显示:HG奶山羊血液中碱性磷酸酶、谷丙转氨酶、谷草转氨酶的活性都高于BG,且差异显著(P0.05)。结论:给泌乳奶山羊高精料饲料中添加复合缓冲剂可以改善泌乳期奶山羊乳品质和产乳量,其机理可能与复合缓冲剂缓解高精料所致的瘤胃p H值下降、减少代谢异常产物的产生,从而改善机体的健康状态有关。
[Abstract]:Objective: to investigate the effect of compound buffer on milk quality and body health of lactating goats fed with high concentrate. Methods: eight middle lactating Sanen goats with similar body weight were randomly divided into high concentrate diet group (60: 40) and buffering concentrate group (BGG) group (high concentrate). The milk production of dairy goats was counted every week for 20 weeks, the milk composition was measured weekly, the rumen fluid and blood samples were collected, the pH value of rumen fluid, the content of lipopolysaccharide polysaccharide LPSs (LPSs) in rumen fluid and the related biochemical indexes in blood were measured at the 19th week. Results: compared with HG, the average daily milk yield, milk protein rate, milk fat rate and lactose content of the goats were higher than those of HG, and the milk fat rate was significantly higher than that of HG(P0.05).HG dairy goats, and the rumen pH value of the goats was lower than that of the HG(P0.05).HG goats, and the symptoms of subacute rumen acidosis appeared. The activity of alkaline phosphatase, alanine aminotransferase and alanine aminotransferase in blood of broiler goats were significantly higher than that of BGG, and the difference was significant (P 0.05). Conclusion: adding compound buffer to high concentrate feed of lactating goats can improve milk quality and milk yield of lactating goats, and its mechanism may be related with compound buffer to alleviate the decrease of rumen pH value caused by high concentrate. Reducing the production of abnormal metabolites, thereby improving the health status of the body.
【作者单位】：南京农业大学动物医学院农业部动物生理生化重点开放实验室;
【基金】：国家重点基础研究发展计划(973计划)项目(2011CB100802)
【分类号】：S827.5

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