Effects of high density chickens creation on the zootechnical yield, cage environment. / Efeitos da criação de frangos em alta densidade sobre a ambiencia do galpão, o rendimento zootecnico e a qualidade da carne.

AUTOR(ES)
DATA DE PUBLICAÇÃO

2005

RESUMO

The chicken creation in high population density has been a worldwide practice with the objective of reducing production costs. This practice causes alterations in the creation ecosystem, interfering in the well-being of the birds, increasing feces and wastes concentration that results in higher formation of irritating gases as the ammonia. These environmental alterations can affect the zootechnical yield of the lots and, possibly, the obtained product quality. Commercial products have been developed to control the microbial population of the bed in the intention of reducing the gases formation. Therefore, this work was developed to evaluate the effects of high density creation of chickens on zootechnical yield, cage environment and quality meat. The muscles were obtained from chickens created in densities of 12, 16 and 20 birds/m2, with existence of the Escherichia coli inoculation stain on chicken bed, and use of Poultry Litter Treatment - PLT® as neutralize agent of both microbial growth and elevation of poisonous gases production. The three treatments, with three replicates, were analyzed for microbial contamination in the beds of the lots inoculated with E. coli NalR during 28 days, and the other microbiological determinations until 35 days, besides determination of ammonia produced along the experiment until the last mentioned day. It was evaluated zootechnical yield parameters, as ration consumption; daily weight increase; alimentary conversion; mortality and productive efficiency index, for detecting possible differences among the analyzed treatments. The sensorial character results demonstrated that chicken breast muscles from E. coli NalR polluted beds and 20 birds/m2 density creations had higher consumers rejection comparing to PLT® treated beds and 12 and 16 birds/m2 density creations. In relation to interference of the produced ammonia, there was an effective acting of PLT® in the first weeks of application. However, gradually the effect was reduced along the remaining period. The zootechnical yield was more relevant in 12 birds/m2 creations, though the parameters of productive efficiency and weight increasing were not divergent from 16 birds/m2 creation. However, both were different from 20 birds/m2 creation when submitted to the contamination of the bed.

ASSUNTO(S)

industria avicola - crescimento zootechnical density meat carne - qualidade frango de corte - criação chicken

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