摘要
本文旨在用线性回归法(又称梯度回归法,regression analysis technique,REG)测定生长母猪钙、磷内源排泄和豆粕钙、磷真消化率。选择6头大白×长白二元杂交生长母猪,平均初始体重为(27.6±3.0)kg。采用6×6拉丁方设计,以玉米淀粉-豆粕为基础配制6个不同钙(0.04%、0.09%、0.13%、0.17%、0.22%和0.26%)和磷(0.09%、0.18%、0.27%、0.35%、0.44%和0.53%)水平的半纯合日粮,试验共6期,每期8d,预试期6d,正试期2d。结果得出,以日粮干物质采食量(DMI)为基础,粪钙的排泄量随日粮钙摄入量的增加而线性增加(P<0.01),用回归曲线法得出内源钙排泄量为0.43g/kg DMI,豆粕钙的真消化率为23.41%。以DMI为基础,粪磷总排泄量随日粮磷摄入量的增加而线性增加(P<0.01),内源磷排泄量为0.89g/kg DMI,豆粕磷真消化率为41.44%。钙平均表观消化率比真消化率低28.77%,磷平均表观消化率比真消化率低29.24%。结果显示,不同钙、磷水平的豆粕日粮,钙、磷的表观消化率变化比较大,而真消化率相对稳定。用表观消化率进行饲料配方,会导致钙、磷生物学效价的低估,造成钙、磷过量添加和猪粪钙、粪磷的增加。用真消化率评定钙、磷的生物学效价,比表观消化率更准确,因此在配制动物日粮时更能接近动物实际生产需要量,既不造成浪费也不会出现缺乏。
This paper was designed to determin endogenous fecal calcium and phosphorus losses and true calcium and phosphorus digestibility with soybean meal for gilts by Simple Linear Regression Analysis Technique （REG）. Six Yorkshire x Landrace gilts with average initial body weight of （27.6 ± 3.0） kg, were fed six diets, according to 6 x 6 Latin square design. Six soybean-cornstarch based diets, containing six levels of calcium （0.04%, 0.09%, 0.13%, 0.17%, 0.22% and 0.26% ） and phosphorus （0.09%, 0.18%, 0.27%, 0.35%, 0.44% and 0.53% ）, were formulated in six experimental periods. Each experimental period comprised 8 d with 6 d adaptation and 2 d collection of fecal samples. When expressed as g/kg DM diet intake, increasing linear relationships （P〈0.01） were found between fecal outputs and dietary inputs of Ca. The endogenous Ca output of gilt was calculated as 0.43 g/kg DMI and true Ca digestibility was calculated as 23.41% when the dietary inputs of Ca point to zero on the regression curve. When expressed as g/kg DM diet intake, increasing linear relationship （P〈0.01） were found between fecal outputs and dietary inputs of P. The endogenous P output of gilt was calculated as 0.89 g/kg DMI and true P digestibility was calculated as 41.44% when the dietary inputs of P point to zero on the regression curve. Apparent digestibility of Ca was lower than true digestibility by 28.77%, and apparent digestibility of P was lower than true digestibility by 29.24%. These results showed that in the soybean diets of different Ca and P levels, apparent di- gestibility of Ca and P vary a lot, but true digestibility of Ca and P are relatively stable. Current diet formulation using apparent Ca and P digestibility leads to underestimation of Ca and P biological availability and excessive intake and excretion of Ca and P in pigs. True Ca and P digestibility should be used in pig diet formulation.
出处
《动物营养学报》
CAS
CSCD
北大核心
2008年第1期1-7,共7页
CHINESE JOURNAL OF ANIMAL NUTRITION
基金
中国科学院“百人计划”项目
关键词
钙
磷
内源排泄量
真消化率
豆粕
生长母猪
Calcium
Phosphorus
Endogenous output
True digestibility
Soybean meal
Gilt
