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首页> 外文期刊>Journal of dairy research >Continuous milking of dairy cows disrupts timing of peak IgG concentration appearance in mammary secretions
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Continuous milking of dairy cows disrupts timing of peak IgG concentration appearance in mammary secretions

机译：连续挤奶的奶牛会破坏乳腺分泌物中IgG浓度峰值出现的时间

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摘要

The length of the dry period in commercial dairy production is under close scrutiny. While the main concern is the composition and volume of milk produced, the evaluation of colostrum quality under these new paradigms has suggested a decline in IgG concentrations, while some reports indicate no change. Colostrum quality has been defined as an adequate concentration (＞50 mg/ml) of immuno-globulin in the secretions to provide the newborn with maximal disease resistance. We investigated the appearance of IgG in mammary pre- and post partum secretions in cows without a dry period (continuously milked, DryO) and compared the secretions with cows that experienced a dry period of 60 d (Dry60). Blood was collected during the experimental period and plasma analysed for progesterone (P4) and prolactin (Prl). Approximately - 6 d relative to parturition, the DryO animals exhibited increased concentration of IgG in their secretions to an average of ～ 35 mg/ml that remained rather constant through subsequent pregnancy and following parturition. DryO cows were producing an average IgG concentration in parturition colostrum of 44.2 ±17.6 mg/ml that was not different than that of controls (66.86 ±16.8 mg/ml). However, DryO cows exhibited high variation, different peak times (day) of IgG concentration including times that occurred both pre and post parturition. IgG mass of the Dry0 cows remained rather constant pre- and post partum and did not show the same declining mass following parturition that was shown for the Dry60 cows. The change in plasma P4 and Prl were shown to have no timing effect on colostrum IgG concentration.
机译：商业乳制品生产的干燥期长度受到严格审查。尽管主要关注的是所生产的牛奶的成分和体积，但在这些新范式下对初乳质量的评估表明IgG浓度有所下降，而一些报告却没有变化。初乳质量被定义为分泌物中足够的免疫球蛋白浓度（> 50 mg / ml），从而为新生儿提供最大的疾病抵抗力。我们调查了无干燥期（连续挤奶，DryO）的奶牛产前和产后IgG的出现，并将其与干燥60天（Dry60）的奶牛的分泌进行了比较。在实验期间收集血液，并分析血浆中的孕激素（P4）和催乳激素（Prl）。相对于分娩大约-6 d，DryO动物的分泌物中IgG浓度增加至平均〜35 mg / ml，在随后的怀孕和分娩后保持相当稳定。 DryO母牛在分娩初乳中产生的平均IgG浓度为44.2±17.6 mg / ml，与对照组的平均IgG浓度（66.86±16.8 mg / ml）没有差异。但是，DryO奶牛表现出很高的变异性，IgG浓度的峰值时间（天）不同，包括分娩前后的时间。产前和产后，Dry0奶牛的IgG质量保持相当恒定，并且在分娩后未显示与Dry60奶牛相同的下降质量。血浆P4和Pr1的变化对初乳IgG浓度没有时序影响。

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  • 来源
    《Journal of dairy research》 |2014年第4期|403-409|共7页
  • 作者

    Craig R Baumrucker; Rahel S Zbinden; H Anette van Dorland; Gerrit J Remmelink; Bas Kemp; Ariette T M van Knegsel; Rupert M Bruckmaier;

  • 作者单位

    Department of Animal Science, Penn State University, University Park, PA, USA ,Veterinary Physiology, Vetsuisse Faculty, University of Bern, Bern, Switzerland;

    Veterinary Physiology, Vetsuisse Faculty, University of Bern, Bern, Switzerland;

    University of Applied Sciences, Zollikofen, Switzerland;

    Livestock Research, Wageningen University and Research Centre, Lelystad, The Netherlands;

    Adaptation Physiology Group, Wageningen University, Wageningen, The Netherlands;

    Adaptation Physiology Group, Wageningen University, Wageningen, The Netherlands;

    Veterinary Physiology, Vetsuisse Faculty, University of Bern, Bern, Switzerland;

  • 收录信息 美国《科学引文索引》(SCI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Continuous milking; colostrum; IgG; progesterone; prolactin;

    机译：连续挤奶;初乳;IgG;黄体酮催乳素;

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