Fasting heat production and metabolic BW in group-housed broilers

Animal : an International Journal of Animal Bioscience
J NobletE Labussiere

Abstract

Fasting heat production (FHP) is used for characterizing the basal metabolic rate of animals and the corresponding maintenance energy requirements and in the calculation of net energy value of feeds. In broilers, the most recent FHP estimates were obtained in the 1980s in slow-growing and fatter birds than nowadays. The FHP values (n=73; six experiments) measured in 3 to 6-week-old modern lines of broilers weighing 0.6 to 2.8 kg and growing at 80 to 100 g/day were used to update these literature values. Each measurement was obtained in a group of fasting broilers (5 to 14 birds) kept in a respiration chamber for at least 24 h. The FHP estimate corresponds to the asymptotic heat production corrected for zero physical activity obtained by modeling the decrease in heat production during the fasting day. The compilation of these data indicates that FHP was linearly related to the BW(0.70) (in kg), which can be considered as the metabolic BW of modern broilers. The 0.70 exponent differs from the conventional value of 0.75 used for mature animals. The FHP per kg of BW(0.70) ranged between 410 and 460 kJ/day according to the experiment (P<0.01). An experiment conducted with a shorter duration of fasting (16 h) indicated that FHP value...Continue Reading

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Apr 1, 2009·Animal : an International Journal of Animal Bioscience·E LabussiereJ Noblet
Aug 19, 2014·Animal : an International Journal of Animal Bioscience·B CarréH Juin

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Citations

Oct 22, 2016·Asian-Australasian Journal of Animal Sciences·Wei LiuHui Yi Cai
Mar 16, 2018·Scientific Reports·Peter G TickleJonathan R Codd
Oct 4, 2019·Poultry Science·Shahram BarzegarRobert A Swick
Aug 28, 2021·Animals : an Open Access Journal From MDPI·Youli WangJianmin Yuan

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