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首页> 外文期刊>Tropical Animal Health and Production >Energy and protein requirements of non-descript breed hair lambs of different sex classes in the semiarid region of Brazil
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Energy and protein requirements of non-descript breed hair lambs of different sex classes in the semiarid region of Brazil

机译：巴西半干旱地区不同性别的非描述性成年羔羊的能量和蛋白质需求

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摘要

The aim of this study was to determine the energy and protein requirements of non-descript breed hair lambs (NDB) reared under Brazilian semiarid conditions. Sixty animals from three sex classes (20 intact males, 20 castrated males, and 20 females) with an average initial body weight of 18.1 +/- 0.4 kg and an average age of 5 months were used. The nutritional requirements were estimated using the comparative slaughter. The animals in the final slaughter group were distributed in a completely randomized design with a 3x3 factorial scheme (three sex classes and three feeding levels: ad libitum feeding (positive energy balance), 70% feed restriction (maintenance level), and 80% feed restriction (negative energy balance)). The net energy requirement for maintenance (NEm) did not differ between sex classes (P>0.05) and it was 68 kcal/kg of metabolic empty body weight (EBW0.75)/day (P 0.05). The coefficients for the nonlinear regression of retained energy (RE) on the empty body weight gain (EBWG) were not different among the different sex classes (P> 0.05). The net energy requirement for weight gain (NEg) was estimated by NEg (Mcal/day) = 0.29xEBW(0.75)x EBWG(0.86) for all sex classes (P 0.05). The net protein requirement for weight gain (NPg) was estimated by NPg (g/day)= 224.45xEBWG-0.025xRE for all sex classes (P 0.05). The NEg increased and the NPg decreased with the increase in body weight of NDB lambs.
机译：这项研究的目的是确定在巴西半干旱条件下饲养的非特征性种羔羊（NDB）的能量和蛋白质需求。使用来自三个性别类别的六十只动物（二十只完整的雄性，二十只去势的雄性和二十只雌性），平均初始体重为18.1 +/- 0.4千克，平均年龄为5个月。使用比较屠宰量估算营养需求。最终屠宰组的动物采用3x3因子分解方案（三种性别和三种喂养水平）以完全随机的设计进行分配：随意喂养（正能量平衡），70％饲料限制（维持水平）和80％饲料限制（负能量平衡）。性别之间的维持所需的净能量（NEm）无差异（P> 0.05），为68 kcal / kg代谢空体重（EBW0.75）/天（P <0.05）。不同性别类别的保留能量（RE）对空体重增加（EBWG）的非线性回归系数无差异（P> 0.05）。对于所有性别类别，体重增加（NEg）的净能量需求通过NEg（Mcal /天）= 0.29xEBW（0.75）x EBWG（0.86）进行估算（P <0.05）。对于所有性别类别，体重增加（NPg）的净蛋白质需求量通过NPg（g /天）= 224.45xEBWG-0.025xRE进行估算（P <0.05）。随着NDB羔羊体重的增加，NEg增加而NPg减少。

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