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首页> 外文期刊>Czech Journal of Animal Science >Changes in protein content and correlations between contents of aminoacids of goat's colostrum during the first 72 hours after parturition
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Changes in protein content and correlations between contents of aminoacids of goat's colostrum during the first 72 hours after parturition

机译：分娩后72小时内山羊初乳蛋白质含量的变化及氨基酸含量的相关性

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摘要

In five female goats of the Czech Brown Polled breed on the 2nd and following lactations, changes were examined in dry matter and basic protein content as well as changes in correlation coefficients between the contents of amino acids found in colostrum from 2 to 72 hours after parturition. The most marked changes in average contents of total dry matter and proteins in colostrum could be observed between the first and the third sampling (i.e., 12 and 24 hours after parturition). The content of total dry matter decreased from 23.8% to 17.5%, that of total nitrogen (TN) dropped from 2.12% to 0.84% and the levels of protein nitrogen (PN) and whey protein nitrogen (WPN) decreased from 1.92% to 0.80% and from 1.40% to 0.38%, respectively On the other hand, casein nitrogen (CN) increased from 0.15% to 0.42% and the casein number rose from 8.0% to 52.2%. The CN content showed the highest variability. In the next period (i.e. between 36 and 72 hours after parturition), changes in all components studied were much smaller. The content of TN dropped from 0.90% to 0.84%, that of PN from 0.85% to 0.80% and that of WPN from 0.36% to 0.25%. In this period, further increase of the CN content from 0.49% to 0.56% occurred, and the casein number rose from 57.8% to 69.4%. Between the Ist and the 2nd sampling, the content of non-protein nitrogen (NPN) in colostrum was approximately 9% of TN and thereafter, i.e. 24 hours after parturition, it varied between 4.7 and 4.8%. Two, 12 and 24 hours after parturition, urea nitrogen (UN) represented 9%; 23% and 52.3% of NPN. In the next period, the percentage of UN in NPN decreased slightly from 32.5 to 30%. Changes of amino acid (AA) contents in the colostrum during the first 72 hours after parturition were published in our earlier publication (Kracmar et aI., 1999). In spite of a high variability of AA contents in colostrum sampled in 2, 12 and 48 hours after parturition, the values of all correlation coefficients of AA contents in individual colostrum samples were found to be very high or high, and all positive (except His and, after 12 hours, also Phe).
机译：在分娩后2至72小时内，在哺乳第2天和哺乳后的捷克棕轮询品种的五只母山羊中，检查干物质和碱性蛋白质含量的变化以及初乳中氨基酸含量之间的相关系数变化。在第一次和第三次采样之间（即分娩后12和24小时），初乳中总干物质和蛋白质的平均含量变化最明显。总干物质含量从23.8％下降到17.5％，总氮（TN）从2.12％下降到0.84％，蛋白氮（PN）和乳清蛋白氮（WPN）的含量从1.92％下降到0.80另一方面，酪蛋白氮（CN）从0.15％增加到0.42％，酪蛋白氮（CN）从8.0％增加到52.2％。 CN含量显示出最高的变异性。在下一个时期（即分娩后36至72小时之间），研究的所有成分的变化要小得多。 TN的含量从0.90％下降到0.84％，PN的含量从0.85％下降到0.80％，WPN的含量从0.36％下降到0.25％。在此期间，CN含量进一步从0.49％增加到0.56％，酪蛋白数量从57.8％增加到69.4％。在第一次和第二次采样之间，初乳中非蛋白质氮（NPN）的含量约为TN的9％，此后，即分娩后24小时，其变化范围为4.7至4.8％。分娩后2小时，12小时和24小时，尿素氮（UN）占9％;占NPN的23％和52.3％。在下一时期，联合国在NPN中的百分比从32.5略微下降到30％。在我们分娩后的最初72小时内，初乳中氨基酸（AA）含量的变化已发表在我们较早的出版物中（Kracmar et al。，1999）。尽管分娩后2、12和48小时内初乳中的AA含量变化很大，但发现各个初乳样品中AA含量的所有相关系数值都非常高或很高，并且均为正值（除了并且在12个小时后也变为Phe）。

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