Efficiency of utilisation of energy from maize- and broken rice-based diets in old White Leghorn and Rhode Island Red laying hens
1999
Jadhao, S.B. | Chandramoni. | Tiwari, C.M. | Khan, M.Y.
1. The efficiency of utilisation of metabolisable energy (ME) for maintenance (k(m)) from diets containing maize and broken rice (BR) at 500 g/kg was studied in old White Leghorn (WL) and Rhode Island Red (RIR) laying hens using the respiration calorimetry technique. The maize-based diet contained l80(.)8 g crude protein (CP)/kg and l6(.)4 MJ gross energy, (GE)/kg while the BR-based diet contained l73(.)2 g CP/kg and l6(.)3 MJ GE/kg. Diets were fed for 10 d, while an energy and nitrogen metabolism study was conducted during 3 d on an ad libitum-fed diet followed by another 3 d on two-thirds of the ad libitum-fed quantity. 2. ME values for the maize- and BR-based diets for WL hens were 73(.)3% and 77(.)6% of the GE, whereas for the RIR hens these were 77(.)7% and 80(.)0%, respectively. 3. Fasting heat productions, determined at the end of 24 h fast for WL and RIR hens were 473(.)2 and 366(.)1 kJ/kg W(0.75)/d, respectively. During fasting WL and RIR hens utilised body energy reserves with efficiencies of 84(.)9% and 73(.)7%, respectively. 4. The k(m) of maize- and BR-based diets for the WL hens were 8l(.)6% and 79(.)6%, whereas for the RIR hens these were 74(.)2% and 76(.)0%, respectively. 5. ME for maintenance of WL and RIR hens were 589 and 499(.)6 kJ/kg W(0.75)/d, respectively. 6. It is concluded that although WL and RIR hens differ significantly in energy metabolism, their efficiency of utilisation of energy from maize- and BR-based diets are similar.
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