Control of the bioavailability of iron in heavy veal production by different feeding management systems: use of Ca-EDTA as an iron chelating agent
1995
Pommier, S.A. (Agriculture and Agri-Food Canada, Lennoxville, Quebec, Canada.) | Lapierre, H. | De Passille, A.M. | Gariepy, C.
Seventy male dairy black and white veal calves were allotted to five treatment groups: MILK, in which animals received exclusively milk replacer; MIX, in which animals received concentrates ad lib and milk replacer during the whole period, more specifically, 750 g of milk powder d-1 starting at week 4; GRAIN, in which animals received milk replacer during the first 4 wk and concentrates during the whole period; MIX+EDTA and GRAIN+EDTA, in which animals received the same diet as their respective controls plus 15 mg of EDTA mg-1 of Fe in the concentrates of the diet starting at week 4 of the experiment. MILK-fed calves had better average daily gains (ADG) than MIX-EDTA-fed or GRAIN+EDTA-fed calves (P 0.001). However, GRAIN+EDTA-fed calves had lower ADG than GRAIN calves (P 0.01). The EDTA treatments were without effect (P 0.10) on feed efficiency and EDTA did not affect N digestibility (P 0.10) or Fe retention (P 0.10). Treatments with EDTA lightened the color of the meat (P 0.01), reduced myoglobin and reduced muscle Fe (P 0.01). Diet reduced carcass fatness in the following decreasing order: MILK, MIX, GRAIN. Treatments with EDTA had no effect on carcass composition
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