Gong Cheng-Yan, Liu Guang, Shi Hong-Peng, Liu Shuan, Gao Xin-Yi, Zhang Shou-Jun, Liu Hao, Li Rui, Wan Dan
Laboratory of Animal Nutritional Physiology and Metabolic Process, Key Laboratory of Agroecological Processes in Subtropical Region, Institute of Subtropical Agriculture, Chinese Academy of Sciences, Changsha 410125, China.
University of Chinese Academy of Sciences, Beijing 101408, China.
Animals (Basel). 2024 Jul 17;14(14):2093. doi: 10.3390/ani14142093.
We aimed to estimate the non-phytate phosphorus (NPP) requirements of Chinese Jing Tint 6 layer chicks. We randomly allocated 720 birds to five treatments with six cages of 24 birds each, feeding them a corn-soybean diet containing 0.36%, 0.41%, 0.46%, 0.51%, and 0.56% NNP. The results showed that the body weight gain (BWG), tibial length, and apparent total tract digestibility coefficients (ATTDC) of P were affected ( < 0.05) by dietary NPP level. A quadratic broken-line analysis ( < 0.05) of BWG indicated that the optimal NPP for birds aged 1-14 d was 0.411%. Similarly, 0.409% of NPP met tibial growth needs. However, 0.394% of NPP was optimal for P utilization according to the ATTDC criterion. For 15-42 d birds, 0.466% NPP, as estimated by the BWG criterion, was sufficient for optimal growth without decreasing P utilization. Using the factorial method, NPP requirements were calculated as 0.367% and 0.439%, based on the maintenance factors and BWG for 1-14 and 15-42 d birds, respectively, to maintain normal growth. Combining the non-linear model with the factorial method, this study recommends dietary NPP levels of 0.367% and 0.439% for 1-14 and 15-42 d birds, respectively, to optimize P utilization without affecting performance.
我们旨在估算中国京粉6号蛋鸡雏鸡的非植酸磷（NPP）需求量。我们将720只鸡随机分配到五个处理组，每个处理组有六个笼子，每个笼子有24只鸡，给它们饲喂含0.36%、0.41%、0.46%、0.51%和0.56%非植酸磷的玉米-大豆日粮。结果表明，日粮NPP水平对体重增加（BWG）、胫骨长度和磷的表观全肠道消化率系数（ATTDC）有影响（P<0.05）。对BWG进行二次折线分析（P<0.05）表明，1至14日龄鸡的最佳NPP为0.411%。同样，0.409%的NPP满足胫骨生长需求。然而，根据ATTDC标准，0.394%的NPP是磷利用的最佳水平。对于15至42日龄的鸡，根据BWG标准估算，0.466%的NPP足以实现最佳生长而不降低磷的利用率。采用析因法，根据1至14日龄和15至42日龄鸡的维持因子和BWG分别计算出NPP需求量为0.367%和0.439%，以维持正常生长。结合非线性模型和析因法，本研究建议1至14日龄和15至42日龄鸡的日粮NPP水平分别为0.367%和0.439%，以优化磷的利用而不影响生产性能。
