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Influence of nutrient restriction on finishing Morada Nova lambs

机译：养分限制对莫达达夫羊羔精加工的影响

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Our objective was to evaluate the effect of 15% crude protein (CP) and total digestible nutrient (TDN) restriction vis-a-vis that recommended by NRC (2007) on feed intake, digestibility, and average daily gain (ADG) of confined Morada Nova lambs. Twenty lambs with 18.8 +/- 2.8 kg liveweight were assigned to a randomized 2 x 2 factorial experiment with either early- or late-maturity feed formulation according to "Nutrient Requirements of Small Ruminants" with or without 15% CP and TDN restriction. The early-maturity diet, independent of restriction, resulted in greater dry matter and organic matter intake and increased rumination efficiency and feed conversion. Early-maturity diets also had the greatest nutrient digestibility as well as ADG and total gains. With late-maturity diets, independent of restriction, there were greater CP and TDN digestibilities as well as neutral detergent fiber (NDF) feed efficiency. However, when 15% of nutrients were restricted for late-maturity lamb diets, there was greater NDF intake and greater ether extract digestibility. Unrestricted early-maturity lamb diets was the better diet for confined Morada Nova lambs. Attention should be given to minimum effective NDF consumed and physically effective for this diet formulation. The use of late-maturity diets as recommended by NRC (2007) allows for 15% restriction of CP and TDN in Morada Nova lambs without negative effects on performance. This restriction should be tested in other tropical breeds to determine wider application.
机译：我们的目的是评估NRC（2007）对NRC（2007）对富含饲料摄入，消化率和平均每日增益（ADG）推荐的15％粗蛋白（CP）和全部消化营养素（TDN）限制性的营养素（TDN）限制性Vis-A的效果莫拉达新羊羔。二十只羊羔具有18.8 +/- 2.8公斤的活重，分配给随机的2 x 2因子实验，根据有或没有15％CP和TDN限制，根据“小反刍动物的营养要求”的早期或晚期成熟饲料配方。早熟的饮食，与限制无关，导致更大的干物质和有机物质摄入量和朗维效率增加和进料转化。早期成熟的饮食也具有最大的营养消化率以及ADG和总收益。随着晚期成熟的饮食，与限制无关，CP和TDN消化量较大，中性洗涤剂纤维（NDF）饲料效率。然而，当15％的营养素限制为晚熟羊肉饮食时，存在更大的NDF摄入量和更大的醚提取物消化率。不受限制的早期成熟羊肉饮食是狭窄的莫拉达新羊羔更好的饮食。应注意最低有效的NDF消耗和物理有效的这种饮食制剂。使用NRC（2007）推荐的晚期成熟饮食允许在Morada Nova Lambs的CP和TDN的15％限制，没有对性能的负面影响。这种限制应在其他热带品种中进行测试，以确定更广泛的应用。

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