Ahemeral light - dark cycle 이 닭의 에너지대사에 미치는 영향 = Effects of Light - dark Cycle Including Ahemeral on Weight Gain , Heat Production and Energy Retention in Cockerels

다국어 초록 (Multilingual Abstract)

Experiments were carried out to determine the effects of the light-dark cycle on weight gain, feed conversion, heat production and energy retention by 9-16 week-old cockerels. Light(L)-dark(D) regimes used were OL-24D, 8L-16D, 12L-12D, 16L-8D, 24L-8D, 13L-8D, 19L-8D and 22L-8D, and the summarized results are as follows. 1. Fasting heat production (FHP) was higher during the light cycle than the dark cycle and not affected by the length of the cycle-21, 24, 27 or 30 hours. 2. The average FHP/Kg^(0.75)/24 hours were 72.7, 74.8, 78.7, 81.8, 80.1, 78.3, 76.3, and 76.4 Kcal in cockerels raised under OL-24D, 8L-16D, 12L-12D, 16L-8D, 24L-0D, 13L-8D, 19L-8D and 22L-8D, respectively`. 3. Cockerels raised under the 19L-8D regimes tended to show higher (p$lt;0.05) body weight gain and better (P$lt;0.05) feed conversion than those raised under the other regimes. 4. The metabolizable energy requirement for maintenance (MEm) was lower in cockerels raised under 16L8D, 19L-8D and 22L-8D than those raised under 13L-8D and NAME was highest in cockerels raised under 19L-8D.