The Effects of Dietary Crude Protein Levels on Nutrient Digestibility, Nitrogen Retention, Rumen Environment and Microbial Nitrogen Synthesis of Growing Female Bach Thao Goats in Vietnam

N. Thu
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Abstract

An experiment was carried out to evaluate the effects of crude protein (CP) contents on feed intake, nutrient digestibility, rumen parameters and estimated nitrogen synthesis of Bach Thao goats. Five female goats from 4-5 months of age (16.7±0.92 kg) were used for this experiment in a Latin square design. Five treatments were applied, containing dietary CP contents of 5.0, 5.5, 6.0, 6.5 or 7.0 g/kgLW/day. The results showed that dry matter (DM), Neutral detergent fiber (NDF) and acid detergent fiber (ADF) intakes and digestibilities were not significantly different among the treatments (P > 0.05), and the rumen parameters were also similar in different treatments. However, the nitrogen retention was significantly different (P < 0.05) among the treatments and it was higher for the treatments of 6.0, 6.5 and 7.0 gCP/kgLW. The purine derivatives and estimated microbial nitrogen synthesis were numerically higher for the treatments containing 6.0, 6.5 and 7.0 gCP/kgLW. Although there was a gradual increase of daily weight gain by increasing the amount of dietary CP from 5.0 to 7.0 gCP, no significant difference was found. Based on the results, the dietary CP from 6.0 to 6.5 g/kgLW for growing Bach Thao goats is recommended.
饲粮粗蛋白质水平对越南生长母羊营养物质消化率、氮沉积、瘤胃环境和微生物氮合成的影响
本试验旨在研究粗蛋白质(CP)含量对巴洮山羊采食量、营养物质消化率、瘤胃参数及估算氮合成的影响。试验选用4 ~ 5月龄(16.7±0.92 kg)的母山羊5只,采用拉丁方设计。试验采用5个处理,饲粮粗蛋白质含量分别为5.0、5.5、6.0、6.5和7.0 g/kgLW/day。结果表明:各处理间干物质(DM)、中性洗涤纤维(NDF)和酸性洗涤纤维(ADF)采食量和消化率差异不显著(P > 0.05),瘤胃参数相似。但各处理间氮滞留量差异显著(P < 0.05),以6.0、6.5和7.0 gCP/kgLW处理最高。6.0、6.5和7.0 gCP/kgLW处理的嘌呤衍生物和微生物氮合成估计值较高。饲粮粗蛋白质从5.0 gCP增加到7.0 gCP,日增重逐渐增加,但差异不显著。综上所述,巴陶山羊生长期饲粮粗蛋白质推荐水平为6.0 ~ 6.5 g/kgLW。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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