Termorregulação de pintos de um dia submetidos a ambiente térmico simulado de transporte

Abstract

An experiment was conducted to assess the thermoregulation of day-old chickens, placed in transport boxes, under simulated transport thermal condition. Two replicated trials were done in two different days in a windowless environmentally controlled chamber. For each one, a total of 360 one-day-old broiler chicks were used. These animals were submitted to three thermal conditions (cold, thermoneutral and heat), for 1 h each. The birds were placed in boxes for day-old chick transport, divided in 40 chicks per box, with three boxes stacked vertically, for each treatment (120 chicks per treatment). Body weight, respiratory frequency, mean surface and cloacal temperature were monitored in a sample of 20 animals per box, with measurements were made before and after the treatments. The box placement had a negligible effect on the thermal comfort of birds. The mean surface and cloacal temperature responses were markedly affected by the cold treatment. However, with an increasing exposure time, the heat treatment might possibly have a clear evidence on the thermoregulation of day-old chickens.