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首页> 外文期刊>Tropical Science >The nutritive value of Napier grass (Pennisetum purpureum) and its potential for milk production with or without supplementation: a review.
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The nutritive value of Napier grass (Pennisetum purpureum) and its potential for milk production with or without supplementation: a review.

机译：纳皮尔草（Pennisetum purpureum）的营养价值及其在补充或不补充的情况下的产奶潜力：综述。

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The existing recommendation of the maturity (age 6-10 weeks, height 60-100 cm) at which Napier is fed to dairy cows is still valid as a general guideline for milk production. The use of crude protein (CP) content and digestible CP as a measure of nutritive value should be replaced by the modern protein evaluation systems. Napier-based diets supported rumen pH and ammonia N concentrations suitable for maximum rumen microbial growth and activity and for optimal organic matter digestibility and feed intake. The efficiencies of rumen microbial protein synthesis were 25, 44 and 168 g N/kg truly fermentable organic matter while the total protein digested in the intestines was 70, 90 and 80 g/kg dry matter (DM) for Napier, legumes and oil meals respectively. Napier-only diet (60-70 g CP/kg DM) supported a mean daily milk yield of 6.8 kg/cow which was accompanied by live-weight loss (-0.44 kg/cow/day). The concentrate supplemented cows produced more milk (9.5 vs 6.6 kg/cow/day) but lost more weight (-0.48 vs -0.37 kg/cow/day) than the Leucaena-supplemented cows. The potential for prediction of yield, nutritive value and milk yield by dairy cows, and the need for more research on dairy production from Napier-based diets are discussed.
机译：纳皮尔饲喂奶牛的成熟度的建议（6-10周龄，身高60-100厘米）仍然有效，可以作为牛奶生产的一般指南。粗蛋白（CP）含量和可消化的CP作为营养价值的度量标准应被现代蛋白质评估系统取代。基于纳皮尔的日粮支持瘤胃pH和氨氮浓度，这些浓度适合最大瘤胃微生物的生长和活性以及最佳的有机物消化率和饲料摄入量。瘤胃微生物蛋白质合成的效率为25、44和168 g N / kg真正可发酵的有机物，而肠道中消化的总蛋白质对于纳皮尔，豆类和油粕而言分别为70、90和80 g / kg干物质（DM）。分别。仅纳皮尔饮食（60-70 g CP / kg DM）支持平均每日牛奶产量6.8 kg /牛，并伴有体重减轻（-0.44 kg /牛/天）。补充了浓缩物的奶牛比补充白术的母牛生产了更多的牛奶（9.5比6.6公斤/牛/天），但体重减轻了（-0.48比-0.37公斤/牛/天）。讨论了预测奶牛产量，营养价值和牛奶产量的潜力，以及对基于纳皮尔饮食的乳制品生产进行更多研究的需求。

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