Parâmetros produtivos e de termorregulação em frangos de corte alimentados com milheto e óleo de milho em dietas a base de sorgo

Abstract

Aimed to evaluate the effects of including millet and corn oil in sorghum-based diets on performance, carcass yield and prime cuts and relative weight of the edible offal of broilers, beyond the effects of diet, sex and age on the mean body temperature (TCM), mean surface temperature (TSM) and the litter temperature. Six hundred and eighty four Hubbard Flex ® male and female broiler chickens were distributed in a completely randomized design and submitted to the diets: A) Sorghum+Soybean meal/Soybean Oil (Control); B) Sorghum+Soybean meal/Corn Oil and C) Sorghum+Soybean meal/Millet+Soybean Oil; with six replicates of 38 birds each (19 males and 19 females). Ambient temperature and humidity were monitored by data loggers. At 14, 21, 35 and 42 days the feed intake, weight gain, feed conversion and viability were evaluated. At 42 days the live weight, carcass yield, cuts and edible offal were obtained. At seven, 14, 21, 28, 35 and 42 days, the litter temperature in each boxing was recorded in seven points. One male and one female from each replicate were chosen for recording the temperatures: wing, head, shin, back and cloaca, to obtain the TSM and TCM. Feed intake, weight gain, feed conversion, live weight, viability, carcass yield, wings, breast, thigh and drumstick and the relative weight of the gizzard, heart and liver was not altered by the inclusion of millet or corn oil in diets. There was an interaction between sex x age for the variables TSM and TCM; and litter temperature only for age. It was concluded that in sorghum-based diets for broilers, millet and corn oil can be added without compromising the productivity of birds and that TSM e TCM decrease as the birds grow older while the litter temperature increases. The diet does not influence TCM, TSM and litter temperature of broiler.