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Utilization of the essential minerals of maize silage by growing sheep


Annales de Zootechnie (Paris) 25(4): 543-550
Utilization of the essential minerals of maize silage by growing sheep
Mineral balances (P, Ca, Mg, K and Na) were carried out in six 28 kg lambs fed maize silage (3.8 g Ca and 2.1 g P per kg dry matter) enriched with urea (1% D.M.) without mineral supplementation. Endogenous fecal losses of P were determined by the isotopic dilution method. The true absorption of P reached 70% of the intake; only 3% Ca were absorbed. The daily balances were 0.39 g for Ca and 0.20 g for P, these values representing about 1/3 of the requirements for a daily weight gain of 140 g. The Na supply was also insufficient. Endogenous fecal losses of P represented 66% of total fecal losses, i.e., 36 mg per kg live weight and per day. The latter value is normal for a diet based on roughage, as endogenous intestinal secretion of P depends on the amount of saliva. This loss is higher than the strict maintenance requirement estimated at 25-30 mg P per kg and per day with this type of diet. Consequently, for 30 kg lambs fed with roughage and gaining 150 g per day a daily supply of 5.5 g Ca and 2.2 g P, i.e. at a ratio of about 2.5 is advisable.


Accession: 006886254



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