Effect of dietary phosphorus and calcium on performance of broilers from 3 to 7 weeks of age
Abstract:In this experiment the effects of total dietary phosphorus (TP) and calcium (Ca) on growth, feed conversion ratio, breast muscle yield, serum phosphorus (P), and bone measurements were examined. From 3 to 6 weeks, four levels of TP (4.5, 5.0, 5.5, and 6.0 g kg–1) and two levels of Ca (7.0 and 9.0 g kg–1) provided eight treatments. From 6 to 7 weeks, diets with two levels of TP (4.5 and 5.5 g kg–1) and three levels of Ca (6.0, 7.0, and 8.0 g kg–1) were used. Diets with 4.5 g kg–1 TP did not contain a source of inorganic P. Interactions were detected for feed intake, weight gain, and serum P at 6 weeks. Birds fed 5.0, 5.5, and 6.0 g kg–1 TP with 9.0 g kg–1 Ca consumed more feed and gained more weight as compared to the other groups. Feed conversion of birds fed the 9.0 g kg–1 Ca diet was lower than those fed diets with 7.0 g kg–1 Ca. Serum P was increased (P < 0.05) at the lowest level of TP when dietary Ca was lowered. Lowering the Ca level, in general, raised (P < 0.05) serum P. Ash was a function of the amounts of TP and Ca in the diets; Ca and P contents of the bones were not affected by the dietary treatments (P > 0.05). Interactions or main effects for TP and Ca were not detected for body weight gain, feed consumption, feed conversion, breast muscle yield, serum P and bone measurements at 7 weeks of age. Our findings demonstrate that from 3 to 6 weeks of age, dietary total P can be lowered to 5.0 – 5.5 g kg–1 while the inorganic P source can be removed in the finisher diets without loss in performance or bone integrity.
Document Type: Research Article
Publication date: 2012-02-01
Avian Biology Research provides a forum for the publication of research in every field of ornithology. It covers all aspects of pure and applied ornithology for wild or captive species as well as research that does not readily fit within the publication objectives of other ornithological journals. By considering a wide range of research fields for publication, Avian Biology Research provides a forum for people working in every field of ornithology. The journal also includes sections on avian news, conference diary and book reviews.
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