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母猪妊娠期间胎儿、胎盘和子宫氨的氨基酸组成

2017-10-23 15:43| 发布者: IMCTT| 查看: 1408| 评论: 0|来自: 猪营养国际论坛CSIS

  2017. J. Anim. Sci. 95(10): 4448-4461
  母猪妊娠期间胎儿、胎盘和子宫氨的氨基酸组成
  Y. D. Jang, Y. L. Ma, R. L. Payne and M. D.Lindemann

  建立准确的妊娠母猪氨基酸需要量模型需要我们能准确地了解到妊娠产物的氨基酸组成。本试验收集了不同妊娠日龄(第43、58、73、91、101、108天)的总计65头妊娠母猪的样品,检测了胎儿、胎盘和子宫的氨基酸组成。随着妊娠时间的延长,胎儿、胎盘和子宫的氨基酸含量(g/kg湿样)随之增加,在妊娠73至108天增加最多(P<0.05)。胎儿氨基酸含量(干基)和氨基酸占总氨基酸比例总体上来说随着妊娠的进行逐渐降低。但是从妊娠第73天开始,精氨酸和丙氨酸显著增加,从妊娠第43天开始甘氨酸和脯氨酸显著提高(P<0.05)。妊娠第101天胎盘氨基酸含量(干基)比妊娠第91天显著增加(P<0.05),随后在妊娠第108天有轻微的降低,而组氨酸、胱氨酸和蛋+胱氨酸无此现象。除精氨酸、丙氨酸、甘氨酸和脯氨酸外(它们的比例从妊娠第58天开始增加),胎盘中其它氨基酸占总氨基酸的比例随着妊娠时间的延长而降低(P<0.05)。子宫中必需氨基酸含量(干基)在妊娠期间没有明显变化。除天冬氨酸外,非必需氨基酸含量随妊娠时间延长而降低(P<0.05)。子宫中一些必需氨基酸(异亮氨酸、亮氨酸、赖氨酸、蛋氨酸、色氨酸和缬氨酸,P<0.06;天冬氨酸,P<0.01)占总氨基酸的比例随妊娠时间的延长而增加,而精氨酸(P=0.08)、胱氨酸、甘氨酸和脯氨酸(P<0.01)的比例随之降低。胎儿、胎盘、子宫内氨基酸组成的差异随氨基酸的不同而不同。试验结果表明胎儿、胎盘、子宫的氨基酸组成随着妊娠的延长有不同程度的变化,胎儿和胎盘中精氨酸、丙氨酸、谷氨酸和脯氨酸的含量尤其有特别显著的变化。这些不同组织的氨基酸组成的数据有助于建立妊娠阶段氨基酸需要量的模型。

  Amino acid composition of fetus, placenta, and uterus in gilts throughout gestation

  Y. D. Jang, Y. L. Ma, R. L. Payne and M. D.Lindemann

  An accurate understanding of the AA composition of the products of conception is needed to accurately model dietary AA needs of pregnant swine. To determine AA composition in fetal pigs, the placenta, and the uterus at various stages of gestation, samples from a total of 65 gilts slaughtered at assigned days of gestation (d 43, 58, 73, 91, 101,and 108) were used. The AA concentrations (g/kg each wet tissue) in the fetus, placenta, or uterus increased as gestation progressed, with major increase soccurring from d 73 to 108 of gestation (P < 0.05). For fetus, AA content on a DM basis (%) and AA contribution to total fetal AA (g/100 g total AA of fetal tissue) generally decreased as gestation progressed (P < 0.05) except for Arg and Ala, which increased from d 73 of gestation, and for Gly and Pro, which increased progressively (P < 0.05) from d 43. Placental AA content on a DM basis increased up to d 91 or 101 of gestation (P < 0.05) and then slightly decreased on d 108 of gestation except for His, Cys, and Met + Cys. Amino acid contribution to total placental AA decreased for all AA as gestation progressed (P < 0.05), except for Arg, Ala, Gly, and Pro, which increased from d 58 of gestation. Essential AA content in the uterus on a DM basis had no major changes during gestation, whereas nonessential AA content decreased (P <0.05) as gestation progressed, except for Asp. For AA contribution to total uterine AA, some essential AA (Ile, Leu, Lys, Met, Trp, and Val; P < 0.06) and Asp (P < 0.01) contributions increased with increasing gestational ages, whereas Arg (P = 0.08), Cys, Gly, and Pro (P < 0.05) contributions decreased as gestation progressed. Differences in AA contribution to total AA within each tissue varied among the fetus, placenta, and uterus by type of AA. These results demonstrate that AA compositions of fetal pigs, placenta, and uterusare changed differentially as gestation progresses; in particular, Arg, Ala, Gly, and Pro compositions in fetus and placenta increased progressively. These compositional data for each reproductive tissue and fetus will help to model AA requirements in gestation.

   来源:猪营养国际论坛CSIS 翻译:朱滔

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