Wahab I M, Anderson R R
Department of Dairy Science, University of Missouri-Columbia 65211.
J Dairy Sci. 1988 Sep;71(9):2554-6. doi: 10.3168/jds.S0022-0302(88)79844-6.
The orotic acid concentration in guinea pig milk decreased rectilinearly beginning on d 1 through a lactation duration of 21 d. Concentration was 29 micrograms/ml on d 1 and 5 micrograms/ml on d 17. On d 18 to 21 it was less than 1 microgram/ml. The regression equation of orotic acid on day of lactation was: Y(micrograms orotic acid per milliliter milk) equals 32.3 - 1.6X (day of lactation) with a correlation coefficient of .94. Total orotic acid on a daily basis peaked on d 6 at 950 micrograms and declined to less than 5 micrograms by d 21. The rectilinear regression equation from d 6 to 21 was as follows: Y(micrograms orotic acid per milliliter milk) equals -1.64 + .68X (grams of milk production per day) with a correlation coefficient of .97. This may be used as a marker for persistency of lactation.
豚鼠乳中乳清酸浓度从第1天开始至21天的泌乳期呈直线下降。第1天浓度为29微克/毫升，第17天为5微克/毫升。第18至21天低于1微克/毫升。泌乳天数与乳清酸的回归方程为：Y（每毫升乳中乳清酸微克数）=32.3 - 1.6X（泌乳天数），相关系数为0.94。每日乳清酸总量在第6天达到峰值950微克，到第21天降至5微克以下。第6天至21天的直线回归方程如下：Y（每毫升乳中乳清酸微克数）=-1.64 + 0.68X（每日产乳克数），相关系数为0.97。这可作为泌乳持续性的一个指标。
