Welfare of broiler breeder and layer females subjected to food and water control during rearing: Quantifying the degree of restriction

Abstract

1. A factorial experiment was conducted with females of two broiler breeder and one layer strains. The birds were fed ad libitum or restricted and were provided with free or limited access to water to simulate commercial rearing practices. 2. There was little difference between the broiler breeder strains except in body weight at 16 and 18 weeks of age. 3. Food intake relative to body weight was higher in the broiler breeders compared with the layer strain. 3. The degree of restriction was defined as the food intake of re‐stricted birds as a proportion of the estimated intake of birds of the same body weight fed ad libitum. The value declined from 0.60 to 0.45 during the rearing period. 5. In the ad libitum treatments broiler breeders drank more than layers, whereas when restricted, layers drank more than broiler breeders. 6. Water intake was 2.50 times higher in restricted compared with ad libitum‐fed layers and 1.25 times higher in restricted than ad libitum‐fed broiler breeders, with free access to water.