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무창 (無窓) 약등시 (弱燈時) 비타민 D3 첨가수준이 브로이러 병아리의 증체 (增體) , 영양소이용율 , 발가락무기물 및 혈청성상에 미치는 영향
장윤환(Y . H . Chiang),이철희(C . H . Lee),박장희(C . H . Park),전진석(J . S . Cheon) 한국축산학회 1984 한국축산학회지 Vol.26 No.2
This study was carried out to observe the effect of vitamin D₃ supplementation levels(0-2500 IU/㎏) on body weight gain, nutrient utilization, toe minerals and serum characteristics of broiler chicks fed cornsoya-fish meal diet in a window-less room under subduced lighting. The arginine content of starter diet was 66% of the level recommended by NRC(1977) and that of grower diet was 90%. The day-old 378 chicks (Hubbard) were allocated at triplicate 9 treatments. In respect to body weight gain an increasing figure was found up to 800 IU/㎏ vitamin D₃ treatment. A slowly increasing trend was obtained from 800 to 2500 IU/㎏ groups. The feed intakes of chicks increased when fed more vitamin D₃ up to 2500 IU/㎏ There was a highly significant correlation between body weight gains and feed intakes of chicks experimented. However, no significant difference was found among treatments in relation to feed conversion, mortality and incidence of weak legs. No significant difference was recognized among treatments in respect to the utilization efficiencies of dry matter, crude protein, and ether extract, too. An increasing figure was shown in utilization efficiencies of nitrogen-free extract when the supplemening level of vitamin D₃ increased. The utilization efficiencies of crude ash were similar among treatments, but chicks fed diet containing 200IU/ ㎏ vitamin D₃ gained lowest values. The utilization of calcium, phosphorus, magnesium, potassium, sodium, iron, zinc and copper were similar among treatments. The contents of ash and minerals in toes of broiler chicks were similar among groups tested. A significant difference was recognized among calcium contents of serum. However, neither increasing nor decreasing trend was fund as more vitamin D₃ was supplied. The similar contents of phosphorus and activities of alkaline phosphatase in serum were obtained among treatments.