Calor metabólico de frangos de corte e poedeiras alimentados com diferentes fontes lipídicas

Abstract

The study was conducted to evaluate the surface temperature and sensible heat loss by radiation from broilers with 35 days and 63 weeks with red hens fed different lipid sources using the thermographic images. There were two stages of data collection, the first with broiler chickens, using a completely randomized in factorial scheme 3 x 2 x 2, corresponding to three diets (control, soybean oil and palm oil); strain (Cobb and Ross) and two sexes. Images were recorded on four different times throughout the day in birds and in the group individually. Individual analysis Ross females had lower surface temperature (Ts) and sensible heat loss by radiation (Qr) was lower in females Cobb. In the group analysis showed palm oil influence on Ts and Ross females showed higher values for Qr. And the hours of the morning had lower Ts. For laying hens was used a randomized block design in a factorial 3 x 4 (diet and time of collection of images respectively). The source of energy did not alter the surface temperature or heat loss by radiation sensitive, which is directly influenced by ambient temperature. There was no difference in feed consumption of laying hens red. Thus, by its chemical composition digestible, palm oil emerges as an important alternative energy source for poultry production and posture, without significantly altering the metabolic heat production of birds.