Calorimetric studies on energy metabolism by the laying white leghorn hen
1986
Rhee, Y.C. (Kangwon National Univ., Chunchon (Korea R.))
The calorimetric experiment was made firstly to measure the difference in energy metabolisms of laying hens among their three different laying periods, secondly to estimate the energy requirements of the layers on their respective laying periods. The laying period was divided into three chronological periods of 25-40, 41-55, and 56-69 weeks old of laying hens, which are referred to as period I, II, and III respectively. The fasting heat production (FHP) of laying hen on the three laying periods were 81.5 Kcal/kg** (0.75) for period I, 72.3 Kcal/kg** (0.75) for period II, and 97.5 Kcal/kg** (0.75) for period III. The marked increase in FHP was found in period III, while there was a small difference in FHP between period I and II
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