Meta-analysis of factors that affect nutrient requirements in laying period of broiler breederhens. Part 1: Developing nutrient requirement models

摘要

Implications Modelling for precision nutrition and nutrient management according to environmental variables is discussedin order to properly demonstrating biological phenomena in prediction equations.Introduction Emmans (1995) identified that potential growth rate is a function of genotype and state (growing or layingstages) of bird. Chwalibog (1992) explained the effect of non-genetic items (environmental conditions, methodologicallimitation and experimental design) beside genetic effects as the reason that can cause the variation of estimatedcoefficients in the literature. Current meta-analysis was conducted to develop nutrient (energy, crude protein, lysine,methionine and cystine) requirement models by considering environmental variables and management conditions forbreeding period of Ross 308 broiler breeder hens.