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首页> 外文期刊>Journal of the Science of Food and Agriculture >In vitro digestion of fresh alfalfa under different conditions of ruminal pH
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In vitro digestion of fresh alfalfa under different conditions of ruminal pH

机译：不同瘤胃pH条件下新鲜苜蓿的体外消化

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BACKGROUND: Relatively low ruminal pH values have been frequently registered in dairy cows grazing alfalfa, which can be involved in reducing feed digestion. An in vitro experiment was carried out to study the effect of ruminal pH (6.4, 6.1, 5.8 and 5.5) on the digestion of fresh alfalfa.RESULTS: Decreasing the pH, in vitro gas production (ivGP) decreased (P < 0.05). The lowest ivGP was registered at pH 5.5 and it was product of a higher lag time and a lower digestion rate. Dry matter disappearance (DMD) was not affected by pH at 48 h (P > 0.05). Neutral detergent disappearance (NDFD) at 48 h decreased below pH 6.1. The NDFD was reduced by 62% at pH 5.5 with respect to results at pH 6.4 and 6.1 (where the highest DMD and NDFD were observed).CONCLUSION: As expected, low rumen pH decreased alfalfa digestion. However, limits to ruminal digestion activity differed from those usually proposed for TMR diets. It is apparent that different relationships between rumen pH and NDFD exist when cows graze fresh alfalfa or grasses. Moreover, our results suggest the convenience to complement the data obtained through ivGP, DMD and NDFD. While ivGP and DMD seem to be more useful at early digestion times, NDFD may be a good predictor of final digestion. Copyright
机译：背景：在放牧苜蓿的奶牛中经常发现相对较低的瘤胃pH值，这可能与减少饲料消化有关。进行体外实验研究瘤胃pH值（6.4、6.1、5.8和5.5）对新鲜苜蓿消化的影响。结果：降低pH值，体外产气量（ivGP）降低（P <0.05）。最低的ivGP记录在pH 5.5处，是滞后时间较长和消化率较低的产物。在48小时时，干物质消失（DMD）不受pH的影响（P> 0.05）。在48小时时，中性洗涤剂消失（NDFD）降至pH 6.1以下。相对于pH 6.4和6.1的结果（观察到最高的DMD和NDFD），在pH 5.5时NDFD降低了62％。结论：低瘤胃pH值降低了苜蓿的消化率。但是，瘤胃消化活性的限制与通常为TMR日粮提议的限制不同。显然，当母牛吃草新鲜的苜蓿或草时，瘤胃pH与NDFD之间存在不同的关系。此外，我们的结果表明，对通过ivGP，DMD和NDFD获得的数据进行补充的便利性。尽管ivGP和DMD在早期消化时间似乎更有用，但NDFD可能是最终消化的良好预测指标。版权

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