Estimation of nutrient excretion factors of broiler and layer chickens in Japan
Estimation of nutrient excretion factors of broiler and layer chickens in Japan
复制标题
日本肉鸡和蛋鸡营养排泄因子的估算
DOI：
10.1111/asj.12674
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发表时间：
2017
影响因子：
2
通讯作者：
Takashi Osada
中科院分区：
文献类型：
--
作者：
Akifumi Ogino;Hitoshi Murakami;Takahiro Yamashita;Motohiro Furuya;Hirofumi Kawahara;Takako Ohkubo;Takashi Osada
本研究采用两种方法和最新数据估算了日本肉鸡和蛋鸡的氮（N）、磷（P）、钾（K）和镁（Mg）排泄因子。在自上而下的方法中，我们确定了饲料和产品中的营养素含量（即增重，鸡蛋），并将全国营养素排泄量确定为这些量之间的差异。然后，我们通过将全国排泄量除以动物数量来计算营养排泄因子。在自下而上的方法中，我们使用生产率参数（饲料转化率等）计算了饲料中的营养物质量和人均产品量。这些量之间的差异被认为是营养素排泄因子。采用自上而下和自下而上方法估算的肉鸡平均养分排泄系数（g/天/头）分别为：N，1.40和1.87; P，0.36，0.50; K，0.54，0.77; Mg，0.13，0.18。通过自上而下方法获得的排泄因子可用于计算国家/地区排泄。两种方法计算出的蛋鸡排泄因子基本相同，平均排泄因子（g/日/头）分别为：N，2.20; P，0.55; K，0.68; Mg，0.23。N（仅）的估计排泄因子小于报告的因子。
We estimated the nitrogen (N), phosphorus (P), potassium (K) and magnesium (Mg) excretion factors of broiler and layer chickens in Japan, using two approaches and the latest data available. In the top‐down approach, we determined the nutrient amounts in the feeds and those in the products (i.e. the liveweight gain, eggs), and the national nutrient excretions were determined as the difference between these amounts. We then calculated the nutrient excretion factors by dividing the national excretions by the number of animals. In the bottom‐up approach, we calculated the amounts of nutrients in the feed and product per head using productivity parameters (feed conversion ratio, etc.). The differences between these amounts were considered the nutrient excretion factors. The average nutrient excretion factors of broilers (g/day/head) estimated using the top‐down and bottom‐up approaches were: N, 1.40 and 1.87; P, 0.36, 0.50; K, 0.54, 0.77; Mg, 0.13, 0.18, respectively. The excretion factors obtained by the top‐down approach can be used to calculate the national/regional excretions. The two approaches resulted in almost the same excretion factors for layers, and the average nutrient excretion factors of layers (g/day/head) estimated were: N, 2.20; P, 0.55; K, 0.68; Mg, 0.23. The estimated excretion factors for N (only) are smaller than the reported factors.