The fasting heat production of broilers is a function of their body composition

• DOI: 10.1016/j.anopes.2022.100029
• Publication Date: 2022-10-30T02:59:33Z
• Authors: D.A. Martinez; N. Suesuttajit; K. Hilton; J.T. Weil; C. Umberson; A. Scott; C.N. Coon
• Keywords: 0402 animal and dairy science; 04 agricultural and veterinary sciences

The fasting heat production ( FHP ; net energy expenditure under maintenance) is a key value to determine the of feed and calculated from measurements in respiratory chambers or predicted as function metabolic BW MBW ). This study aimed influence body composition on broilers through modeling approach. Six experiments (Exp 1–6) were conducted develop 1–4) externally validate 5 6) predictive models. In Exp 1–4, single genetic line floor pens subjected three dietary treatments induce differences composition. (calorimetry chambers) protein-to-fat ratio PFR Dual-Energy X-ray Absorptiometry) recorded at nine time points between 7 55 days. Linear models adjusted (considering pen experimental unit), starting with model containing sole predictor. Further modifications tested by including age birds. A random split refitting approach was applied. Four internally validated refitted whole data. They considered (or BW) PFR, not birds, showed high precision R 2 > 0.98) accuracy (error < 2.5%). All demonstrated that birds same have higher leaner they are. Body protein fat are positively negatively correlated FHP, respectively. 5, two lines fed for 22 41 6, continuous dose–response design 17, 20, data 6 considering validation unit. four selected prediction (validation 0.92) (model error 3%) externally. conclusion, BW, FHP. Including improved strength