Abstract
Effect of the electrolyte balance in the ration on bone and poultry litter parameters. The effects of dietary electrolyte balance (DEB) on the femurs and litter of broilers were evaluated. Nine hundred and sixty birds from 7 to 21 days of age and eight hundred and sixteen birds from 22 to 38 days of age were used in the first and second experiments, respectively, distributed in a completely randomized design with four treatments (DEB: 200, 240, 280 and 320mEq/kg) and four replicates. Poultry litter was analyzed for moisture, pH, volatilized ammonia and bulk. Femurs were weighed and analyzed for bone density, morphometry and weight/length index. DEB did not affect (P>0.05) the bones at 21 and 38 days or the pH, volatilized ammonia or bulk of litters at 21 days, but there was a linear effect (P 0.05) of the treatments on the pH or volatilized ammonia of litters at 38 days of age. However, the moisture (Ŷ =35.01 + 3.30X, R 2 =0.29) and bulk (Ŷ =194.17 + 31.12X, R 2 =0.54) of the litters increased (P<0.03) when the DEB value was higher than 280mEq/kg. It was concluded that diets with 200mEq/kg of DEB can be used for broilers with no negative effects on bone and poultry litter parameters.
Highlights
O balanço eletrolítico da dieta (BED) de frangos de corte tem um importante papel não só na manutenção de um bom desempenho produtivo, mas também para bom desenvolvimento ósseo e da qualidade da cama de frango
A temperatura alta no verão é um grande desafio para a indústria avícola, pois o calor reduz a ingestão de alimentos, o ganho de peso e o peso de carcaça além de aumentar a mortalidade (Teeter e Belay, 1996)
O estresse calórico resulta em aumento da taxa respiratória, com perda excessiva de CO2 e à alcalose respiratória, com elevação do pH sanguíneo (Borges et al, 2003b)
Summary
O balanço eletrolítico da dieta (BED) de frangos de corte tem um importante papel não só na manutenção de um bom desempenho produtivo, mas também para bom desenvolvimento ósseo e da qualidade da cama de frango. Esse trabalho foi desenvolvido para avaliar o efeito de diferentes valores de BED sobre a densidade, morfometria e índice peso/ comprimento do fêmur e sobre o teor de matéria seca, pH, amônia volatilizada e densidade da cama de frangos de corte no 21o e no 38o dia de criação, ao final das fases inicial e de crescimento, respectivamente.
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