Hamdi M, Solà-Oriol D, Davin R, Perez J F
Animal Nutrition and Welfare Service (SNiBA). Departament de Ciència Animal i dels Aliments. Universitat Autònoma de Barcelona, 08193 Bellaterra, Spain.
Animal Nutrition and Welfare Service (SNiBA). Departament de Ciència Animal i dels Aliments. Universitat Autònoma de Barcelona, 08193 Bellaterra, Spain
Poult Sci. 2015 Sep;94(9):2136-43. doi: 10.3382/ps/peu061. Epub 2015 Jan 30.
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.
进行了一项试验，以评估不同钙源（石灰石、氯化钙和Lipocal，一种脂肪包裹的磷酸三钙，TCP）与4种非植酸磷（NPP）日粮水平对肉鸡生产性能、钙和磷的回肠消化率以及骨骼矿化的影响。还对钙源进行了体外评估，以测量不同pH值下的酸结合能力（ABC）和钙溶解度。氯化钙的钙溶解度最高，而TCP的ABC最高。罗斯雄性肉雏鸡在孵化后第1天按体重分类，每种日粮分配到5个笼子，每个笼子5只鸡。12种日粮按3种钙源和4种NPP水平（0.3%、0.35%、0.4%或0.45%）的3×4析因设计安排，所有日粮中添加4种磷水平（磷酸二氢钙）并添加高剂量植酸酶（1150 U/kg）。在孵化后第14天，处死3只鸡，分别收集回肠食糜和右胫骨，以测定回肠钙和磷消化率以及骨骼矿化情况。TCP和石灰石组在第14天的采食量（FI）和体重增加（WG）高于（P<0.01）氯化钙组。添加磷使饲喂TCP至0.4%NPP的雏鸡和饲喂石灰石至0.35%NPP的雏鸡的胫骨重量和胫骨灰分含量增加。氯化钙组的钙回肠消化率（73.7%）高于（P<0.01）石灰石组（67.1%）或TCP组（66.8%），磷酸一钙添加水平增加时，石灰石组和TCP组的钙回肠消化率增加（P<0.05）。磷回肠消化率不受钙源影响，随NPP添加水平增加而增加（P<0.001）。可以得出结论，与高溶解度钙源相比，起始肉鸡对低溶解度钙源反应更好。在含有石灰石或TCP的日粮中添加0.35%-0.40%的NPP和高剂量植酸酶（1150 U/kg）足以保证0至14日龄肉鸡的生产性能和骨骼形成。
