Statistical modelling of data from performance of broiler chickens

• Autor(a) principal: Hilario, Reginaldo Francisco
• Data de Publicação: 2018
• Tipo de documento: Tese
• Idioma: eng
• Título da fonte: Biblioteca Digital de Teses e Dissertações da USP
• Texto Completo: http://www.teses.usp.br/teses/disponiveis/11/11134/tde-18012019-165449/
• topic: Broiler chickens; Frango de corte; Mixture models; Modelos de mistura; Poder de teste; Power of the F test; Sample size; Tamanho amostral

Experiments with broiler chickens are common today, because due to the great market demand for chicken meat, the need to improve the factors related to the production of broiler chicken has arisen. Many studies have been done to improve handling techniques. In these studies statistical analysis methods and techniques are employed. In studies with comparisons between treatments, it is not uncommon to observe a lack of significant effect even when there is evidence to indicate the significance of the effects. In order to avoid such eventualities it is fundamental to carry out a good planning before conducting the experiment. In this context, a study of the power of the F test was made emphasizing the relationships between test power, sample size, mean difference to be detected and variance for chicken weights data. In the analysis of data from experiments with broilers with mixed sexes and that the experimental unit is the box, generally the models used do not take into account the variability between the sexes of the birds, this affects the precision of the inference on the population of interest . We propose a model for the total weight per box that takes into account the sex information of the broiler chickens.