Figure 1From: Milk yield responses to changes in milking frequency during early lactation are associated with coordinated and persistent changes in mammary gene expressionChanges in milk production in response to IMF. A. Total milk yield or B. difference in milk yield between udder halves, of 6 cows assigned to unilateral frequent milking (UFM; twice daily milking (2×) of the left udder half, four times daily milking (4×) of the right udder half) for days 1 to 21 of lactation. Quartermilk production was measured through 45 d of lactation, and milk production from the 2× udder half was subtracted from that of the 4× udder half to obtain differential yield. There was no difference between udder halves in milk production on day 1 of lactation (P > 0.30). Milk production of the 4× udder half increased dramatically (P < 0.001) during UFM and was greater than that of the 2× udder half through day 45 of lactation (P < 0.01). Black vertical arrows indicate timing of biopsy sampling.Back to article page