Co-Authors:
Plavnik, I., Institute of Animal Science, Agricultural Research Organization, Volcani Center, Bet Dagan, 50250, Israel
Wax, E., Institute of Animal Science, Agricultural Research Organization, Volcani Center, Bet Dagan, 50250, Israel
Sklan, D., Department of Animal Science, Faculty of Agriculture, Hebrew University, Rehovot 76100, Israel
Bartov, I., Institute of Animal Science, Agricultural Research Organization, Volcani Center, Bet Dagan, 50250, Israel
Hurwitz, S., Institute of Animal Science, Agricultural Research Organization, Volcani Center, Bet Dagan, 50250, Israel
Abstract:
The efficacy of fat and carbohydrates as energy sources was compared in 1- to 4- and 4- to 7-wk-old broiler chickens and in 16- to 19-wk-old turkeys. An increase in dietary energy by carbohydrate was made by a graded replacement of wheat bran by wheat. Energy was increased by fat through a graded replacement of soybean hulls with refined soybean oil. In the experiments with broiler chickens, the feed efficiency responses to added energy were observed within the entire range of dietary energy tested, with no significant differences between the responses to carbohydrate and fat as energy supplements. The growth response to energy from either source appeared to be characterized by diminishing returns in the chicken. In the 16- to 19-wk-old turkeys, the growth and feed efficiency responses were linear within the range from 2,650 to 3,250 kcal/kg. In chickens and in turkeys, the growth and feed efficiency responses to energy supplied by fat were indistinguishable from those of carbohydrates. In chickens, the fractions of abdominal fat and pectoral muscle were not affected significantly by the energy density and source.
תפריט נגישות
ניגודיות עדינה
מונוכרום
הדגשת קישורים
חסימת אנימציה
פונט קריא
סגור
איפוס הגדרות נגישות
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