Behavioral parameters and surface temperatures of feed chicken with different leves vitamin E

Abstract

The objective of this study was to evaluate the behavioural parameters and surface temperatures of broilers fed different vitamin E levels. A total of 240 male, day-old Cobb 500® broiler chicks were raised until the seventh day of life, according to the recommendations for the strain, receiving feed with only 50% of vitamin E requirements. At eight days of age, the birds were weighed and standardised, and the treatments distributed in a completely randomised design with four treatments (50, 100, 150 and 200% of vitamin E requirements) and six replicates of ten birds per experimental unit. The variables evaluated were the behavioural parameters of the birds (eating, drinking, idleness and other activities) and the feed intake within 24 hours as well as the maximum and minimum surface temperatures, and thermal amplitudes at the end of each life cycle (21 and 42 days). Vitamin E levels did not influence behavioural parameters or feed intake over 24 hours at 21 and 42 days of age. There was no interaction between vitamin E levels and maximum and minimum temperatures or thermal amplitudes. However, the maximum and minimum temperatures and thermal amplitudes were influenced by the morning and afternoon periods at 21 and 42 days of age. Dietary vitamin E levels did not influence the behavioural patterns of broilers at 21 and 42 days of age.