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首页> 外文期刊>Tropical Animal Health and Production >Effects of crude protein and undegradable intake protein on growth performance, nutrient utilization, and rumen fermentation in growing Thai-indigenous beef cattle
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Effects of crude protein and undegradable intake protein on growth performance, nutrient utilization, and rumen fermentation in growing Thai-indigenous beef cattle

机译：粗蛋白和缺乏的进气蛋白对生长泰国牛肉牛生长性能，营养利用和瘤胃发酵的影响

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摘要

The objective of this study was to investigate growth performance, nutrients apparent digestibility, nitrogen utilization, rumen fermentation, and rumen microorganism of growing Thai-indigenous beef cattle receiving different levels of crude protein (CP) and undegradable intake protein (UIP) diets. Eighteen healthy growing Thai-indigenous beef cattle were used in a 2 x 3 factorial randomized complete block design (RCBD). There were six treatments: two levels of CP (10% and 12% of dry matter (DM)) and three levels of UIP (15%, 25%, and 35% of CP). The results indicated that dry matter intake (DMI) and average daily gain (ADG) increased linearly (P 0.01) with increasing UIP level. The apparent digestibility of DM, organic matter (OM), acid detergent fiber (ADF), and neutral detergent fiber (NDF); rumen fermentation parameters; microbes counts; and microbial nitrogen synthesis (MNS) were unaffected (P> 0.05) by CP and UIP levels. The nitrogen (N) intake and N retained increased linearly (P 0.01) with increasing UIP level. Specifically, the metabolizable protein (MP) requirement of 1 g/ kg BW).75 gain was 0.34 g MP/kg BW.75; the 10% dietary CP of DM was able to meet animals' normal nutrition requirements and 6.5% DIP of DM can provide adequate N source for the requirement of rumen microbe growth in. Collectively, it was indicated that the supplemental level of 10% CP and the ratio of UIP to DIP was 35:65 in diets shown the best growth performance for growing Thai-indigenous beef cattle under the conditions in the current study.
机译：本研究的目的是探讨生长性能，营养性表观消化率，氮利用，瘤胃发酵和瘤胃微生物，以及产生不同水平的粗蛋白（CP）和未加工的进气蛋白（UIP）饮食。在2 x 3因子随机完成块设计（rcbd）中使用了十八份健康的泰国土着牛肉牛。有六种治疗方法：两种水平的Cp（干物质（DM）的10％和12％）和三种含量的UIP（15％，25％和35％CP）。结果表明，随着UIP水平的增加，干物质摄入（DMI）和平均每日增益（ADG）增加（P <0.01）。 DM，有机物（OM），酸洗涤剂纤维（ADF）和中性洗涤剂纤维（NDF）的表观消化率;瘤胃发酵参数;微生物数量;通过CP和UIP水平，微生物氮合成（MNS）未受影响（P> 0.05）。随着UIP水平的增加，氮（n）摄入量和n被线性地增加（P <0.01）。具体地，1g / kg bw的代谢蛋白（mp）要求.75增益为0.34g / kg bw.75; DM的10％膳食CP能够满足动物的正常营养要求，6.5％DM的DIP可以提供足够的N个源，以便要求瘤胃微生物生长。集体表示，其补充水平为10％CP和UIP与浸渍的比例为35:65，为在目前研究的条件下，在生长的泰国 - 土着牛肉中的最佳增长性能。

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