UTILISATION DU PHOSPHATE MONOAMMONIQUE CHEZ LE MOUTON I. — UTILISATION COMPARÉE DU PHOSPHORE DES PHOSPHATES MONOAMMONIQUE ET MONOSODIQUE ET INFLUENCE SUR LE MÉTABOLISME DU CALCIUM ET DU MAGNÉSIUM

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Abstract
Two consecutive mineral balance experiments were carried out with 5 male lambs weighing about 30 kg and fed a diet containing beet pulps and cassava with a low P content (1.3 g/kg dry matter) and a high Ca content (10 g/kg). The basal diet was enriched with P either derived from monosodium phosphate (diet 1) or from monoammonium phosphate (diet 2) in order to triple the P level. A parallel trial with isotopic dilution (after injection of 32P) was realized on 4 animals in order to determine the endogenous fecal losses of P, which increased with P intake. Urinary losses of P and Ca were always negligible; those of Mg were relatively large. On account of the amount of endogenous fecal P (55-60 mg of P/kg liveweight per day), the true availability of P was 62% on an average for the 2 diets. This indicates an intestinal availability of phosphate P exceeding 65% in spite of the presence of an excess of dietary Ca. The true availability of Ca was low, but noticeably higher for diet 2 (21%) than for diet 1 (14%). The acidification due to monoammonium phosphate did not have any unfavorable action on mineral metabolism since Ca and Mg balances were improved. The biological efficiency of monoammonium phosphate was at least equal or superior to that of monosodium phosphate.

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