title: Calcium sources and their interaction with the different levels of non-phytate phosphorus affect performance and bone mineralization in broiler chickens.
abstract: An experiment was conducted to evaluate the influence of different Ca sources (limestone, Ca chloride, and Lipocal, a fat-encapsulated tricalcium phosphate, TCP) in conjunction with 4 dietary levels of non-phytate P (NPP) on performance, ileal digestibility of Ca and P, and bone mineralization in broiler chickens. Calcium sources were also evaluated in vitro to measure acid-binding capacity (ABC) and Ca solubility at different pH values. Ca chloride showed the highest solubility of Ca, with TCP showing the highest ABC. Ross male broiler-chicks were sorted by BW at 1 d post-hatch and assigned to 5 cages per diet with 5 birds per cage. Twelve diets were arranged in a 3×4 factorial of the 3 Ca sources and 4 levels of NPP (0.3%, 0.35%, 0.4% or 0.45%) consisting of 4 added P levels (Ca(H2PO4)2) with a high dose of phytase (1,150 U/kg) in all diets. On d 14 post-hatch, 3 birds were euthanized, and ileal digesta and the right tibia were collected to determine ileal Ca and P digestibility and bone mineralization, respectively. Feed intake (FI) and weight gain (WG) on d 14 was higher (P<0.01) with TCP and limestone than with Ca chloride. Added P increased the tibia weight and tibia ash content in chicks fed TCP up to 0.4% NPP and limestone up to 0.35% NPP. Calcium ileal digestibility was higher (P<0.01) with Ca chloride (73.7%) than with limestone (67.1%) or TCP (66.8%), which increased (P<0.05) with added levels of P from monocalcium phosphate. Phosphorus ileal digestibility was not affected by the Ca source and increased (P<0.001) with added levels of NPP. It can be concluded that starting broilers responded better to low-soluble Ca sources compared to high-soluble sources. A level of 0.35%-0.40% NPP with a high dose of phytase (1,150 U/kg) in diets including limestone or TCP is sufficient to guarantee performance and bone formation for broiler chickens from d 0 to d 14.
authors: Animal Nutrition and Welfare Service (SNiBA). Departament de Ciència Animal i dels Aliments. Universitat Autònoma de Barcelona, 08193 Bellaterra, Spain.
authors: M
authors: M
authors: Hamdi
authors: Animal Nutrition and Welfare Service (SNiBA). Departament de Ciència Animal i dels Aliments. Universitat Autònoma de Barcelona, 08193 Bellaterra, Spain.
authors: D
authors: D
authors: Solà-Oriol
authors: Animal Nutrition and Welfare Service (SNiBA). Departament de Ciència Animal i dels Aliments. Universitat Autònoma de Barcelona, 08193 Bellaterra, Spain.
authors: R
authors: R
authors: Davin
authors: Animal Nutrition and Welfare Service (SNiBA). Departament de Ciència Animal i dels Aliments. Universitat Autònoma de Barcelona, 08193 Bellaterra, Spain josefrancisco.perez@uab.cat.
authors: J F
authors: JF
authors: Perez
mesh_terms: D010832:6-Phytase / Q000008:administration & dosage / Q000378:metabolism; D000821:Animal Feed / Q000032:analysis; D000824:Animal Nutritional Physiological Phenomena; D000818:Animals; D002113:Calcification, Physiologic; D002136:Calcium, Dietary / Q000008:administration & dosage / Q000378:metabolism*; D002645:Chickens / Q000254:growth & development / Q000502:physiology*; D004032:Diet / Q000662:veterinary; D019587:Dietary Supplements / Q000032:analysis; D004063:Digestion; D007082:Ileum / Q000502:physiology; D008297:Male; D016226:Phosphorus, Dietary / Q000008:administration & dosage / Q000378:metabolism*; D012995:Solubility
chemical_list: D002136:Calcium, Dietary; D016226:Phosphorus, Dietary; D010832:6-Phytase
keywords: Ca solubility; bone mineralization; calcium; ileal digestibility; phosphorus