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Effects of calcium carbonate, magnesium oxide and encapsulated sodium bicarbonate on measures of post-ruminal fermentation.
Journal of Animal Physiology and Animal Nutrition ( IF 2.7 ) Pub Date : 2020-02-21 , DOI: 10.1111/jpn.13331
Kayla P Neiderfer 1 , Amanda M Barnard 1 , Kassandra Z Moyer 1 , Alexis M Trench 1 , Ashley E Taylor 1 , Shane K Cronin 1 , Tanya F Gressley 1
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Evidence suggests that lipopolysaccharide (LPS) absorbed from the large intestine may contribute to the inflammatory response to high starch feeding in dairy cows. This work evaluated the impact of buffers or alkalinizing agents with expected large intestinal activity on faecal indicators of intestinal fermentation and LPS. Ten late-lactation cows were used in a replicated 5 × 5 Latin square design with 7-day periods. Cows were fed a diet containing 265 g/kg dry matter of starch and were abomasally infused with 1 g/kg body weight cornstarch daily. Treatments were control (CON), ration supplementation with 200 g/day sodium bicarbonate (FSB), 200 g/day calcium carbonate (FCC) or 125 g/day calcium carbonate plus 75 g/day of magnesium oxide (FCCM), or abomasal infusion of a lipid encapsulate providing 200 g/day sodium bicarbonate (ISB). The FCC, FCCM and ISB treatments were hypothesized to have large intestinal buffering effects, and FSB was included as a secondary control. Milk, feed, rumen and faecal samples were collected on day 7 of each period. Treatment did not affect intake, milk yield or milk composition. There were no effects of treatment on ruminal measures except that ISB tended to reduce and the post-ruminal treatments as a whole (FCC, FCCM and ISB) reduced rumen butyrate compared with CON. Faecal pH was greater for FCCM compared with all other treatments. Total faecal VFA tended to increase with FCC and FCCM compared with CON and was increased by the post-ruminal treatments as a whole compared with CON. Treatment did not affect faecal dry matter, lactate or LPS or apparent total tract nutrient digestibility. Although some treatments altered fermentation as evidenced by the change in faecal VFA, this was not accompanied by a decrease in faecal LPS. The strategies employed in this study had limited effects on large intestinal fermentation.

中文翻译:

碳酸钙,氧化镁和封装的碳酸氢钠对瘤胃后发酵的影响。

有证据表明,从大肠吸收的脂多糖(LPS)可能会导致奶牛高淀粉喂养的炎症反应。这项工作评估了具有预期大肠活性的缓冲液或碱化剂对肠发酵和LPS粪便指标的影响。十只泌乳期奶牛以7天的周期重复使用5×5拉丁方格设计。给奶牛饲喂含有265 g / kg淀粉干物质的日粮,并每天向腹部注入1 g / kg体重的玉米淀粉。处理为对照(CON),定量补充200 g /天的碳酸氢钠(FSB),200 g /天的碳酸钙(FCC)或125 g /天的碳酸钙加75 g /天的氧化镁(FCCM)或原住民输注脂质胶囊,提供200克/天的碳酸氢钠(ISB)。FCC,假设FCCM和ISB治疗具有较大的肠道缓冲作用,并且将FSB作为辅助对照。在每个时期的第7天收集牛奶,饲料,瘤胃和粪便样品。治疗不影响摄入量,牛奶产量或牛奶成分。与IS相比,除ISB趋于降低以及瘤胃后整体治疗(FCC,FCCM和ISB)总体上降低瘤胃丁酸盐外,治疗对瘤胃措施没有任何影响。与所有其他处理相比,FCCM的粪便pH值更高。与CON相比,FCC和FCCM的总粪便VFA趋于增加,与CON相比,整个瘤胃后治疗增加了粪便的VFA。处理不影响粪便干物质,乳酸或LPS或表观总道养分消化率。尽管如粪便VFA的变化所证明的,某些处理改变了发酵,但这并没有伴随粪便LPS的降低。本研究中采用的策略对大肠发酵的影响有限。
更新日期:2020-02-21
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