. Dairy farming : being the theory, practice, and methods of dairying. Dairy farms; Dairy plants; Milk plants. COLUSTRUM. 195 fi^enerallj' some time befure the folldwini;- parturi- tion. The quantity as well as quality of the milk nnilergoes eonsiderable changes during this time. The largest quantity is secreted during the first month; after that the yield goes down somewhat, but remains for about two and a half months pretty stationary. It then gets less and less during the next six months, until the secretion is quite dried up. Of course, this rule applies only to the average mileh-eows, and
. Dairy farming : being the theory, practice, and methods of dairying. Dairy farms; Dairy plants; Milk plants. COLUSTRUM. 195 fi^enerallj' some time befure the folldwini;- parturi- tion. The quantity as well as quality of the milk nnilergoes eonsiderable changes during this time. The largest quantity is secreted during the first month; after that the yield goes down somewhat, but remains for about two and a half months pretty stationary. It then gets less and less during the next six months, until the secretion is quite dried up. Of course, this rule applies only to the average mileh-eows, and is greatly influenced by the in- dividual properties of the animals. Many cows remain dry much longer than the desirable six or eight weeks, during which the extra nourish- ment required by the foetus ought not to be lessened l)y milk-secretion; but when cows remain dry for three or four months it is a great loss to the farmer, and considerably diminishes the value of the cows. Some animals never stop giving milk up to the day of calving, when a fresh flow of it begins. The composition, condition, colour, taste, and smell of the milk that a cow gives for several days after calving differ greatly from that which she gives later on. It is usually of a deep yellow colour, and is peculiarly luscious and unctuous, the latter owing to an excess of albu- men. Rennet does not coagulate it, but boiling does. The specific gravity is I'OJG to IM)(i5. Colustrum contains, besides the milk-globules, other particles, consisting, according to the researches of FUrstenberg, of pieces of membrane and clusters of cells, which he takes for milk-globules in a state of transition, , not perfectly formed yet (Fig. 88). These cells contain a granulous substance. 88.—Colustrum. and fluid in which one or more drops of fat are suspended. Fiirstenberg has observed these clusters in all grades of their decay, or rather their falling into milk-globules, and has found this process further advanced the
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