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首页> 外文期刊>Tropical Animal Health and Production >Nutrient digestibility and feedlot performance of lambs fed diets varying protein and energy contents
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Nutrient digestibility and feedlot performance of lambs fed diets varying protein and energy contents

机译：不同蛋白质和能量含量的羔羊饲喂日粮的营养消化率和肥育性能

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Thirty-six Thalli male growing lambs were used in a completely randomized design with 2 × 2 factorial arrangement of treatments to evaluate the effect of varying levels of energy and protein on nutrient intake, digestibility, weight gain, and gain to feed ratio. Four experimental diets, i.e., low energy–low protein (LE-LP), low energy–high protein (LE-HP), high energy–low protein (HE-LP), and high energy–high protein (HE-HP) were formulated. The low- and high-energy diets contained 2.3 and 2.7 MJ/kg dry matter (DM) with 12% and 14% of crude protein. The lambs were fed ad libitum. Dietary energy and protein levels and their interactions influenced the nutrient intake. Maximum dry matter intake was noted in animals fed LE-HP diet followed by LE-LP, HE-HP, and HE-LP diets. Digestibility of DM and N increased (P < 0.01) and that of neutral detergent fiber decreased (P < 0.01) linearly with increasing levels of dietary energy and protein. Digestibility of N was only affected by protein level and interaction between energy and protein levels. Average daily gain was higher (P < 0.01) in lambs fed HE-HP diet followed by LE-HP, LE-LP, and HE-LP diets. Dietary energy and protein levels and their interaction had significant effect (P < 0.01) on gain to feed ratio.
机译：将36只Thalli雄性成年羔羊用于2×2因子安排的完全随机设计，以评估能量和蛋白质水平变化对营养摄入，消化率，体重增加和增重和饲喂比率的影响。四种实验饮食，即低能量低蛋白（LE-LP），低能量高蛋白（LE-HP），高能量低蛋白（HE-LP）和高能量高蛋白（HE-HP）被制定。低能量和高能量饮食含有2.3和2.7 MJ / kg干物质（DM），其中粗蛋白占12％和14％。随意喂羔羊。饮食能量和蛋白质水平及其相互作用影响营养摄入。在饲喂LE-HP日粮的动物中，其次是LE-LP，HE-HP和HE-LP日粮，注意到最大的干物质摄入量。 DM和N的消化率随日粮能量和蛋白质水平的增加而线性增加（P <0.01），中性洗涤剂纤维的消化率线性下降（P <0.01）。氮的消化率仅受蛋白质水平以及能量和蛋白质水平之间相互作用的影响。饲喂HE-HP日粮的羔羊的平均日增重较高（P <0.01），其次是LE-HP，LE-LP和HE-LP日粮。饮食能量和蛋白质水平及其相互作用对增重饲料比有显着影响（P <0.01）。

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