Gajdosík D, Szabóová E
Vet Med (Praha). 1984 Jun;29(6):329-36.
Samples of blood, urine and milk were examined in 94 clinically healthy cows of 10 herds. The average milk samples and the feed ration used in these herds were also examined. The determination of urea concentration and milk acidity was evaluated as to its suitability for the assessment of the protein-glycide ratio and acid-base activity of feed ration. The determination of urea content in an average milk sample was found to be an expeditious procedure. The results of this examination can be used for the evaluation of the protein supply to cows with the same reliability as the determination of serum urea. The passage of urea from serum to milk was proportional. The correlation coefficient for the relation of both parameters was statistically highly significant (r = 0.940). According to the calculated equation of regression line (f2 = 0.734 + 0.669 X f1), the values from 2.94 to 4.10 mmol/l are approximately adequate to the reference range of serum urea from 3.30 to 5.00 mmol/l in milk used in Czechoslovakia. The acidity of milk was found to have a low sensitivity for being used with success for the determination of the acid-base activity of feed ration. The examination of the net acid-base urinary output cannot be replaced by the determination of milk acidity.
对10个牛群的94头临床健康奶牛的血液、尿液和牛奶样本进行了检测。还检测了这些牛群的平均牛奶样本和所用的饲料配比。评估了尿素浓度和牛奶酸度的测定对于评估饲料配比的蛋白质 - 碳水化合物比例和酸碱活性的适用性。发现测定平均牛奶样本中的尿素含量是一种快速的方法。该检测结果可用于评估奶牛的蛋白质供应情况，其可靠性与测定血清尿素相同。尿素从血清到牛奶的转移是成比例的。两个参数关系的相关系数在统计学上具有高度显著性（r = 0.940）。根据计算出的回归线方程（f2 = 0.734 + 0.669 X f1），2.94至4.10毫摩尔/升的值大致符合捷克斯洛伐克使用的牛奶中血清尿素3.30至5.00毫摩尔/升的参考范围。发现牛奶酸度在成功用于测定饲料配比的酸碱活性方面敏感性较低。净酸碱尿排出量的检测不能用牛奶酸度的测定来替代。
