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Journal of Nutrition
Bar, A., Inst. Anim. Sci., Agric. Res. Organ., Volcani Cent., Bet Dagan, Israel
Hurwitz, S., Inst. Anim. Sci., Agric. Res. Organ., Volcani Cent., Bet Dagan, Israel
Fast-growing heavy (White Rock) chicks, fed a vitamin D-deficient diet, exhibited a higher activity of kidney 25-hydroxycholecalciferol-1-hydroxylase (1-hydroxylase) than slow-growing light (White Leghorn X Rhode Island Red) chicks fed the same diet. 1-Hydroxylase and duodenal calcium-binding protein (CaBP) declined with age. Feeding of low energy diets with or without vitamin D resulted in a slower rate of growth and reduced 1-hydroxylase activity and CaBP concentration. Severe dietary restriction of either calcium or phosphorus resulted in a lower growth rate as well as a duodenal CaBP as compared to a moderate mineral restriction. The severe dietary calcium restriction also resulted in a lower 1-hydroxylase activity than that resulting from a moderate restriction. The results clearly indicate that high 1-hydroxylase activity and a high intestinal CaBP are associated with a high growth rate.
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תנאי שימוש
Relationships between cholecalciferol metabolism and growth in chicks as modified by age, breed and diet
111
Bar, A., Inst. Anim. Sci., Agric. Res. Organ., Volcani Cent., Bet Dagan, Israel
Hurwitz, S., Inst. Anim. Sci., Agric. Res. Organ., Volcani Cent., Bet Dagan, Israel
Relationships between cholecalciferol metabolism and growth in chicks as modified by age, breed and diet
Fast-growing heavy (White Rock) chicks, fed a vitamin D-deficient diet, exhibited a higher activity of kidney 25-hydroxycholecalciferol-1-hydroxylase (1-hydroxylase) than slow-growing light (White Leghorn X Rhode Island Red) chicks fed the same diet. 1-Hydroxylase and duodenal calcium-binding protein (CaBP) declined with age. Feeding of low energy diets with or without vitamin D resulted in a slower rate of growth and reduced 1-hydroxylase activity and CaBP concentration. Severe dietary restriction of either calcium or phosphorus resulted in a lower growth rate as well as a duodenal CaBP as compared to a moderate mineral restriction. The severe dietary calcium restriction also resulted in a lower 1-hydroxylase activity than that resulting from a moderate restriction. The results clearly indicate that high 1-hydroxylase activity and a high intestinal CaBP are associated with a high growth rate.
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