Energy partitioning at low temperatures in broiler breeders.

摘要: The objective of this study was to investigate how broiler breeder hens partitioned dietary metabolisable energy (ME) at low temperatures. Performance caged breeders fed equal quantities nutrients (other than energy) measured in six environmental chambers, with temperature being kept constant 10, 12.5, 15 (two chambers), 17.5 and 20°C. Throughout the twelve-week trial, birds were 160g/d one four diets containing 12.9, 11.9, 10.5 or 9.7 MJ ME/kg, which provided 2064, 1904, 1680 1552 kJ ME/bird d. reduction daily allocation decreased body weight gain, while egg not affected. Rate lay output similar among 1904 ME/d, allotment ME d depressed rate by 16.1% 19.4 g/d respectively. proportion lipid increased increasing intake, percentage water, protein ash decreased. Decreasing from 19.5 9.9°C output, weight, gain increased. Temperature had no effect on carcass constituents. intake (in kJ/d), as a function (W, kg), (EO, g/d), growth (∆W, g/d) (T, C) estimated be = W (383 – T) + 6.4 EO 9.9 ∆W 53.5 ∆L, where ∆L is (g/d). maintenance performance intakes that are lower recommended breeding company, linear temperatures maintenance, have important implications when modelling nutrient hens.