Dairy Chemistry And Biochemistry

PRODUCTION AND UTILIZATION OF MILK^5

WPI.LAR1ES

C0:NECTIbE

ISSUE

N LK PRVEIN

\ PPAHATUS GOLGi

Figure 1.2 Milk-producing tissue of a cow, shown at progressively larger scale. (a) A
longitudinal section of one of the four quarters of a mammary gland; (b) arrangement of the
alveoli and the duct system that drains them; (c) single alveolus consisting of an elliptical
arrangement of lactating cells surrounding the lumen, which is linked to the duct system of the
mammary gland; (d) a lactating cell; part of the cell membrane becomes the membrane covering
fat droplets; dark circular bodies in the vacuoles of Golgi apparatus are protein particles, which
are discharged into the lumen. (From Patton, 1969.)