Oliveira A P, Pereira E S, Biffani S, Medeiros A N, Silva A M A, Oliveira R L, Marcondes M I
Department of Animal Science, Universidade Federal do Ceará, Fortaleza, Ceará, Brazil.
Istituto di Biologia e Biotecnologia Agraria, Consiglio Nazionale delle Ricerche, Lodi, Italia.
J Anim Physiol Anim Nutr (Berl). 2018 Feb;102(1):e52-e60. doi: 10.1111/jpn.12700. Epub 2017 Mar 2.
The objective of this study was to estimate, through mathematical models, energy and protein requirements for maintenance and gain of hair sheep raised in the tropical region of Brazil. To determine the equation parameters, a meta-analysis of seven independent experiments of nutrient requirements was performed, comprising a total of 243 experimental units (animals), which were conducted under tropical conditions, using hair sheep in growing and finishing phases and endowed of the following quantitative data for each animal: body weight (BW), empty body weight (EBW), average daily gain (ADG), empty body gain (EBG), heat production (HP), metabolizable energy intake (MEI), retained energy (RE), metabolizable protein intake (MPI) and body protein content. The regression equations generated were as follows: for Net Energy for maintenance, (NE ): LogHP(MJEBW-0.75day-1)=-0.6090(±0.07470)+0.5149(±0.07216)×MEI(MJEBW-0.75day-1); for Net Energy for gain, (NE ): LogRE(MJEBW-0.75day-1)=0.03084(±0.05334)+0.8455(±0.04355)×LogEBG(kg/day); for Metabolizable Protein for maintenance,(MP ): MPI = 24.8470 (±7.3646) + 560.28 (±99.6582) × EBG ; for Net Protein for gain, (NP ): NPg(kg/day)=0.1941×EBW(kg)-0.1058. The NE requirement was 0.246 MJ EBW day . The metabolizable energy for maintenance requirement was 0.391 MJ EBW day . Considering an ADG of 100 g, the NE requirement ranged from 0.496 to 1.701 MJ/day for animals with BW ranging from 10 to 40 kg respectively. The efficiencies of use of the metabolizable energy for maintenance and gain were 0.63 and 0.36 respectively. The MP requirement was 3.097 g EBW day . Considering an ADG of 100 g, the NP requirement ranged from 12.4 to 10.5 g/day for animals with BW ranging from 10 to 40 kg respectively. The total metabolizable energy and protein requirements were lower than those reported by the NRC and AFRC systems. Thus, our results support the hypothesis that nutrient requirements of hair sheep raised in tropical regions differ from wool sheep raised in temperate regions. Therefore, the use of the equations designed in this study is recommended.
本研究的目的是通过数学模型估算巴西热带地区饲养的毛用绵羊维持和生长所需的能量和蛋白质。为确定方程参数，对七项独立的营养需求实验进行了荟萃分析，总共包括243个实验单位（动物），这些实验在热带条件下进行，使用处于生长和育肥阶段的毛用绵羊，并记录了每只动物的以下定量数据：体重（BW）、空腹体重（EBW）、平均日增重（ADG）、空腹体重增加量（EBG）、产热量（HP）、可代谢能量摄入量（MEI）、保留能量（RE）、可代谢蛋白质摄入量（MPI）和身体蛋白质含量。生成的回归方程如下：维持净能量（NE ）：LogHP（MJ EBW-0.75 day-1）=-0.6090（±0.07470）+0.5149（±0.07216）×MEI（MJ EBW-0.75 day-1）；生长净能量（NE ）：LogRE（MJ EBW-0.75 day-1）=0.03084（±0.05334）+0.8455（±0.04355）×LogEBG（kg/day）；维持可代谢蛋白质（MP ）：MPI = 24.8470（±7.3646）+560.28（±99.6582）×EBG；生长净蛋白质（NP ）：NPg（kg/day）=0.1941×EBW（kg）-0.1058。维持所需的NE为0.246 MJ EBW day。维持所需的可代谢能量为0.391 MJ EBW day。考虑到平均日增重为100 g，体重在10至40 kg之间的动物，其NE需求分别为0.496至1.701 MJ/天。维持和生长的可代谢能量利用效率分别为0.63和0.36。维持所需的MP为3.097 g EBW day。考虑到平均日增重为100 g，体重在10至40 kg之间的动物，其NP需求分别为12.4至10.5 g/天。总的可代谢能量和蛋白质需求低于NRC和AFRC系统报告的需求。因此，我们的结果支持以下假设：热带地区饲养的毛用绵羊的营养需求与温带地区饲养的毛用绵羊不同。因此，建议使用本研究设计的方程。
