Cama de casca de café tratada com condicionadores químicos e sua influência na qualidade do coxim plantar de frangos de corte / Coffee hull litter treated with chemical conditioners and its influence on quality of foot pads broilers

AUTOR(ES)
DATA DE PUBLICAÇÃO

2009

RESUMO

Along with the opening of new markets for feet of broiler exportation there has been a bigger concerning to the identification of injuries that lead to the cutting. Because of this, the present study had as its aim evaluate the influence of coffee hull litter treated with chemical conditioners on foot pads broilers, on the animal performance of the broilers and quality of litter. The experiment was developed in winter time, during a complete productive cycle, in a commercial poultry farm integrated to Pif Paf Industry, in the municipality of Canãa, coffee producer region in Zona da Mata Mineira. It was used three similar sheds, where it was installed a circular box with seven divisions, 2 m2 each, corresponding to seven treatements. Coffee liter was used as a substrate in every treatment with 6 cm of thickness, except for the treatment 7, where it was used new wood shaving litter. The treatments were the following: new litter with no treatment, new litter treated with simple superphosphate (30 kg/ton), new litter treated with phosphogypsum on the proportion of 40% of the litter total weight, new litter treated with hydrated lime (0.5 kg/m2), reused litter (two plots), reused litter treated with hydrated lime (0.5 kg/m2) and wood shaving new litter. 22 Chicks were distributed in each treatment, totalizing for 154 broilers for each shed with a density of 11 birds /m2 . The litter samples were collected on 7th , 21st and 42nd day in order to evaluate humidity level, pH, ammoniacal-N and total bacterial counts. The incidence of lesions the foot pads was evaluated in all broilers at 7, 14, 21, and 42 days of breeding. The criteria for scoring lesions were the following: 0 = without lesions; 1 = inflammation; 2 = severe ulceration. It was not noted differences on animal performance among treatments. In the warming phase, the reused litter treated with hydrated lime determined the highest number of broilers with lesions on the foot pads. The new coffee hull litter treated with simple superphosphate as well as hydrated lime didn t determine incidence of lesions on the broilers foot pads in the first phase of the production cycle (21 days). At the end of the second phase of the production cycle (42 days), the reused litter with no treatment and the new coffee hull litter treated with simple superphosphate determined the lowest percentage of broilers with lesions on the foot pads. The hydrated lime provided a raise on pH at the initial phase of the production cycle (7 days), as well as it reduced the humidity of reused litter when compared to the new litter. The phosphogypsum reduced the litter pH at the end of the second phase of the production cycle. The level of N-amonniacal of the reused litter with no treatment was higher to the new coffee hull litter with no treatment and the new litter treated with hydrated lime. It was not noted the effect of chemical conditioners on the total bacterial counts.

ASSUNTO(S)

frangos de corte coxim plantar cama construcoes rurais e ambiencia litter foot pads broiler

ACESSO AO ARTIGO

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