Within one hour there is a marked increase to 8mm Hg, which is caused by residual milk moving from the alveoli to the ducts and cisterns. This initial increase is followed by a slower increase in pressure for up to about 20 hours after milking. A plateau in udder pressure is approached after about 24 hours, indicating that resorption is occurring or that secretion is ceasing. Relationship of udder pressure to secretion rates of dairy cows. D. Residual milk 1.
Residual milk is that milk left in the udder after normal milking.
Older cows tend to have a greater proportion of residual milk than heifers. Percentage of milk present in the udder at the beginning of milking that remains as residual milk after milking. The values were obtained from different experiments under a variety of conditions. Thus, the preceding milking interval length can affect the amount of complementary milk which, in turn, can affect secretion rates in a current milking interval. Buildup of chemical constituents of milk synthesis are inhibitory to further milk secretion in the alveoli epithelial cell.