3～6周龄北京鸭钙磷需要量的研究

Calcium and Phosphorus Requirements of Pekin Ducks from 3 to 6 Week of Age

本试验旨在研究3～6周龄北京鸭适宜钙磷需要量。试验采用4×4二因子完全随机试验设计,4个非植酸磷水平(0.17%、0.25%、0.33%和0.41%),4个钙水平(0.30%、0.48%、0.66%和0.84%)。将640只15日龄雄性北京鸭随机分为16个处理,每处理4个重复,每重复10只鸭,试验期为15～42日龄。结果表明:(1)在0.17%非植酸磷水平下,随日粮钙水平升高,日增重和采食量显著降低(P<0.05);但是在0.25%、0.33%和0.41%非植酸磷水平下,随日粮钙水平升高,日增重和采食量表现出先升高后降低的二次曲线变化趋势。(2)在0.17%非植酸磷水平下,随日粮钙水平升高,胫骨灰分和胫骨磷含量显著降低(P<0.05);然而,在0.33%和0.41%非植酸磷水平下,随日粮钙水平升高,胫骨灰分含量显著升高(P<0.05),但日粮钙水平对胫骨磷含量未产生显著影响(P>0.05)。综合本试验结果,采用二次响应面回归分析表明,以日增重和胫骨磷含量为评价指标,3～6周龄北京鸭钙和非植酸磷适宜需要量分别为0.72%和0.37%、0.66%和0.37%。

A 4 × 4 factorial experiment with four non-phytate phosphorus levels （0.17%, 0.25%, 0.33% and 0.41%） and four calcium levels （0.30%, 0.48%, 0.66% and 0.84%） was conducted to study the calcium and phosphorus requirements of Pekin ducks from 3 to 6 week of age. Six hundred and forty 15-day-old male Pekin ducklings were divided into 16 experimental treatments which contained 4 replicates and each replicate contained 10 ducklings, and these ducklings were raised with experimental diets from 15 to 42 days of age. The results showed that the daily weight gain and feed intake decreased significantly （P〈0.05） as dietary calcium increased at 0.17% non-phytate phosphorus level, but the daily weight gain and feed intake exhibited up-down quadratic trend at 0.25%, 0.33% and 0.41% non-phytate phosphorus levels; the tibia ash and tibia phosphorus decreased significantly （P〈0.05） as dietary calcium increased at 0.17% non-phytate phosphorus level, but tibia ash increased significantly as dietary calcium increased （P〈0.05） and tibia phosphorus was not influenced by dietary calcium level （P〉0.05） at 0.33% and 0.41% nonphytate phosphorus levels. It is concluded that, according to the quadratic responding surface regression analysis, the requirements of calcium and non-phytate phosphorus for optimal daily weight gain and tibia phosphorus are 0.72% and 0.37%, 0.66% and 0.37%, respectively.