Optimal Available Phosphorus Levels in Diets Containing Different Dicalcium Phosphate Particle Sizes for Japanese Quails

ABSTRACT This experiment was conducted to investigate the effects available phosphorus levels and dicalcium phosphate particle size on the live performance, and egg parameters and bone parameters of Japanese quails in lay. The experimental diets were based on corn and soybean meal and formulated to contain 2900 kcal metabolizable energy (ME)kg-1, 200 g kg-1 crude protein (CP) and 30.5 g kg-1 calcium (Ca). Feeds were supplied ad libitum. Laying Japanese quails (n=720, 20-wk-old)were distributed in a completely randomized design in a 5 x 2 factorial arrangement, with five levels of available phosphorus (avP; 1.0, 2.0, 3.0, 4.0, 5.0 g kg-1) and two dicalcium phosphate particle sizes (fine orcoarse), totaling ten treatments with eight replicates of nine birds each. Egg laying rate, feed intake per bird per day, egg weight, egg mass, feed conversion ratio per egg mass and per dozen eggs, eggshell, yolk and albumen relative and absolute weights, as well as bone ash, phosphorus, calcium, and magnesium contents were evaluated. Based on the results, avP recommendations for 20- to 32-wk-old laying Japanese quails varies according with phosphate source particle size and the dietary avP levels of 4.40 g kg-1 and 3.85 g kg-1avP levels when using fine and coarse particle dicalcium phosphate, respectively, yielded the best results.

摘要 本试验旨在探究有效磷（available phosphorus, avP）水平与磷酸二钙粒径对产蛋期日本鹌鹑的生产性能、蛋品质参数及骨骼参数的影响。试验日粮以玉米与豆粕为基础配方，配制为代谢能（metabolizable energy, ME）2900 kcal·kg⁻¹、粗蛋白（crude protein, CP）200 g·kg⁻¹、钙（calcium, Ca）30.5 g·kg⁻¹的营养水平，试验组自由采食该日粮。选取720只20周龄产蛋日本鹌鹑，采用完全随机设计，设置5×2因子安排：5个有效磷水平（1.0、2.0、3.0、4.0、5.0 g·kg⁻¹）与2种磷酸二钙粒径（细粒与粗粒），共计10个处理组，每组设8个重复，每个重复9只鹌鹑。本试验测定指标包括产蛋率、单只日采食量、蛋重、总蛋重、每单位总蛋重及每打鸡蛋的料重比，蛋壳、蛋黄、蛋清的相对与绝对重量，以及骨灰分、磷、钙与镁含量。基于试验结果，20~32周龄产蛋日本鹌鹑的有效磷推荐量因磷酸盐源粒径而异：当使用细粒磷酸二钙时，日粮有效磷水平为4.40 g·kg⁻¹可获得最优生产性能；而采用粗粒磷酸二钙时，最优日粮有效磷水平为3.85 g·kg⁻¹。