[Effect of nutritional composition of sorghum on calcium and magnesium retention in lamb feces]
1991
Villalba, Juan Jose | Laborde, Hugo Eduardo | Arelovich, Hugo Mario (Universidad Nacional del Sur, Bahia Blanca (Argentina). Dept. de Agronomia)
Two growth stages of forage sorghum (cv. Novillero), first growth (Pc) and regrowth (R), were developed under different edaphic moisture conditions, without and with irrigation, respectively. Both diets were offered to lambs confined in metabolic cages to determine the effect of fiber intake upon calcium and magnesium excretions. Acid detergent fiber and cellulose concentrations were lower for Pc, but hemicellulose level was higher than that determined for R (P 0.05). Dry matter and neutral detergent fiber intake and excretion increased for Pc as well as consumption of functional chelating groups (P 0.05). Mg concentration in feces and Mg excretion were higher for lambs offered Pc (P 0.05). Ca excretion was not modified by the levels of fiber intake. It is concluded that the proportion of forage structural components affected only Mg excretion but not Ca
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