Scientific Works Series C. Veterinary Medicine

PRINT ISSN 2065-1295, ISSN-L: 2065-1295, ISSN CD: 2343-9394,ISSN ONLINE 2067-3663


Published in Scientific Works. Series C. Veterinary Medicine, Vol. LXVIII, Issue 1
Written by Mihai Cristian MĂRGĂRIT, Roxana MĂRGĂRIT, Cristiana GENES, Rosalie Adina BĂLĂCEANU, Nicolae DOJANĂ

This paper aimed the particularities of the phosphorus (P) metabolism in 40-week-old Red-Mini-Rock hens subject of different available phosphorus (aP) supplemented diet feeding. Six diets containing 4.0, 3.5, 3.0, 2.5, 2.0 and, respectively, 1.5 g aP / kg diet of food were tested. The experimental feeding lasted five weeks. Research on the effect of different levels of aP in the diet on the metabolism of P in Red-Mini-Rock layers allowed the identification of particularities related to the ability to absorb, to store in bones and to release for egg formation of the P. The mobilization of the P from the bone is amplified as the dietary supplement decreases, increasing the loss of soluble P through manure. The total P content of the blood serum decreases with the level of aP supplementation but the variations are not linear. The total P content of the eggs increases only with high levels of aP. Food intake and laying rate are not affected by different levels of aP supplementation. In conclusion, a supplement of 2.0-2.5 g aP/kg diet of diet seems to better meet the metabolic requirements of Red-Mini-Rock hens from 40 to 45 week of age.

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