摘要
以 10 0头二花脸母猪作为试验动物 ,对猪乳中蛋白质、乳糖、IGF- 、EGF和胰岛素含量在泌乳 1～ 2 1d阶段的变化进行了曲线拟合 ,并分析了这些乳成分的变化规律。结果表明 ,倒数曲线为乳蛋白、IGF- 、EGF和胰岛素随泌乳时间变化的最优拟合曲线。乳蛋白、IGF- 、EGF和胰岛素含量随时间的延续而下降 ,其拟合方程分别为 :y=33.74 4+85 .80 3÷ x(g· L- 1 ) ,y=4 2 .5 94 +2 90 .0 2 3÷ x(μg· L- 1 ) ,y=132 .84 1+6 38.5 98÷ x(ng· L- 1 ) ,y=18.0 73+316 .92 3÷ x(U·m L- 1 ) ,其中 x为泌乳天数。乳糖的最优拟合曲线为对数曲线 ,乳糖含量随时间的延续而上升 ,其拟合方程为 :y=32 .2 2 3+9.6 2 6 lnx(g· L- 1 ) ,x为泌乳天数。猪乳成分变化最为剧烈的是在初乳期 。
With 100 Erhualian sows as experimental animals,protein,lactose,,EGF and insulin concentrations in sow milk were assayed during lactation(1-21 d) after parturition.With these data,the curve models of milk components changes along with lactation day were estimated;the variation regularities of milk components were also analyzed.Fitting equations to these data yielded the following relationship between milk components(protein,lactose,IGF-Ⅰ,EGF and insulin) and lactation day:protein for y=33.744+85.803÷x(g·L^(-1)),lactose for y=32.223+9.626lnx(g·L^(-1)),IGF-Ⅰ for y=132.841+638.598÷x(ng·L^(-1)),insulin for y=18.073+316.923÷x(U·mL^(-1)),where x was expressed in lactation days.Protein,lactose ,EGF and insulin concentrations in sow milk intensely varied in colostrum period(1-7 d),changed slightly in period of mature milk(7-21 d).Protein,IGF-Ⅰ,EGF and insulin concentrations gradually decreased as lactation progressed,but lactose concentration gradually increased along with lactation day.
出处
《中国兽医学报》
CAS
CSCD
北大核心
2004年第3期264-267,共4页
Chinese Journal of Veterinary Science
基金
国家自然科学基金资助项目 ( 3 9770 5 5 4)
