AB Vista Feed Ingredients, Marlborough, Wiltshire, SN8 4AN, UK.
Poult Sci. 2012 Sep;91(9):2255-63. doi: 10.3382/ps.2012-02224.
An experiment was conducted to evaluate the influence of a highly soluble Ca (HSC) source on performance, bone ash and mineralization, and apparent ileal digestibility of Ca, P, N, and energy in Ross 708 broiler chickens. Dietary Ca was supplied by the HSC source and monocalcium phosphate to provide 4 levels of Ca (0.45, 0.60, 0.75, or 0.90%). Available P (aP) was maintained at 0.32% in all the diets. Each diet was supplemented with 0, 500, or 2,500 U/kg of phytase as a 4 × 3 factorial. An additional diet was formulated using limestone to contain 0.90% Ca and 0.45% aP as a positive control (PC). Diets were fed to 7 replicate cages of 8 birds per cage from d 0 to 21 posthatch. Feed intake (FI) was linearly (P ≤ 0.05) reduced, and BW gain was quadratically (P ≤ 0.05) reduced as Ca from HSC increased from 0.45 to 0.90%. Phytase supplementation linearly (P ≤ 0.05) increased FI and BW gain and improved feed conversion ratio. Tibia ash and P weights were lower in birds fed 0.90% Ca from HSC compared with broilers fed 0.90% Ca from limestone. Phytase supplementation increased tibia ash and P weights in broilers fed 0.60, 0.75, or 0.90% HSC (Ca level × phytase P ≤ 0.05). Phytase supplementation linearly (P ≤ 0.05) increased tibia Ca weight. Reducing HSC from 0.90 to 0.45% or increasing phytase supplementation linearly (P ≤ 0.05) improved ileal P digestibility. Ileal Ca digestibility increased linearly only in broilers fed 0.45% Ca from HSC as phytase supplementation increased (Ca level × phytase P ≤ 0.05). Nitrogen or energy digestibility were quadratically (P ≤ 0.05) influenced as HSC or phytase increased. In conclusion, feeding HSC with phytase allowed for reductions in dietary Ca while maintaining broiler performance and bone ash. In addition, P digestibility and P in the bones were increased in broilers fed reduced dietary Ca in the presence of phytase.
进行了一项实验，以评估高水溶性钙 (HSC) 源对罗斯 708 肉鸡性能、骨灰和矿化以及钙、磷、氮和能量表观回肠消化率的影响。日粮中的钙由 HSC 源和磷酸一钙提供，以提供 4 个钙水平 (0.45、0.60、0.75 或 0.90%)。所有日粮的有效磷 (aP) 均保持在 0.32%。在每种日粮中添加 0、500 或 2500 U/kg 的植酸酶作为 4×3 析因。还使用石灰石配制了一种日粮，其中含有 0.90%的钙和 0.45%的 aP，作为阳性对照 (PC)。从孵化后 0 天到 21 天，将日粮喂给 7 个重复笼，每个笼 8 只鸟。随着 HSC 中钙的含量从 0.45 增加到 0.90%，采食量 (FI) 呈线性下降 (P≤0.05)，BW 增加呈二次曲线下降 (P≤0.05)。植酸酶的添加量呈线性增加 (P≤0.05)FI 和 BW 增益并改善饲料转化率。与用石灰石喂养 0.90%钙的肉鸡相比，用 HSC 喂养 0.90%钙的肉鸡胫骨灰分和 P 重量较低。植酸酶的添加量增加了 0.60、0.75 或 0.90% HSC 饲养的肉鸡的胫骨灰分和 P 重量 (Ca 水平×植酸酶 P≤0.05)。植酸酶的添加量呈线性增加 (P≤0.05)胫骨 Ca 重量。将 HSC 从 0.90%降低到 0.45%或线性增加植酸酶的添加量 (P≤0.05)可提高回肠磷的消化率。仅在用 HSC 喂养 0.45%钙的肉鸡中，随着植酸酶添加量的增加，回肠钙消化率呈线性增加 (Ca 水平×植酸酶 P≤0.05)。氮或能量消化率呈二次曲线影响 (P≤0.05) 随着 HSC 或植酸酶的增加而增加。总之，在用 HSC 喂养的同时添加植酸酶可以在保持肉鸡性能和骨灰的同时减少日粮钙的用量。此外，在存在植酸酶的情况下，用减少的日粮钙喂养肉鸡可提高磷的消化率和骨骼中的磷含量。
