二花脸猪乳中蛋白组分的动态变化

Dynamic analyses of protein components in Erhualian sow milk

分析了 10头二花脸猪乳中主要蛋白质组分在泌乳 1～ 2 0天的含量及其动态变化。结果表明 ,α_乳白蛋白 (α_La)浓度前 4天呈上升趋势 ,1周后略有下降 ,然而其浓度和百分比均差异不显著。β_乳球蛋白 ( β_Lg)、总酪蛋白 (tCN)和清蛋白(SA)的浓度第一天最高 ,β_Lg有下降趋势 ,SA缓慢下降 ,而tCN规律性不强。β_Lg百分比差异不显著。tCN百分比随着泌乳天数逐日上升。SA的百分比在泌乳一周内变化不大 ,后开始下降。免疫球蛋白 (lgs)、乳铁蛋白 (Lf)浓度以及Igs百分比第一天显著高于其它泌乳天数 ,然后急剧下降 ,在一周后处于很低的水平 ,Lf百分比呈下降趋势。一组高分子量蛋白质(HMWP)浓度和百分比在一周内逐渐上升。

Relative proportion and concentration of main milk proteins were determined in 10 Erhualian sows during lactation (1～20d) after parturition.The concentration of α La tended to increase during lactation 1～4d postpartum,both concentration and proportion of which had no significant changes by F test.The concentration of β Lg,tCN and SA were the highest at 1d after farrowing.During lactation day(1～20d) after parturition,β-Lg concentration tended to decrease,SA concentration gradually decreased,tCN concentration mutated irregularly.The proportion of β Lg varied little during lactation(1～20d).The proportion of tCN successively increased during the experimental period,peaked at 20d postpartum.SA proportion varied little within the first week postpartum,then declined slowly.Igs proportion and concentration,as well as of Lf concentration,were the highest at 1d postpartum,then sharply decreased in subsequent days,lower than in lactation(7～20d).Lf proportion presented downtrend.The proportion and concentration of HMWP gradually rose during 1～7d after parturition.