200 



LIVE-STOCK JUDGING 



may also be considered the products of the cell, since they 

 do not appear in the blood. Fat is produced by a special 

 secretory .activity of the cell itself during which its proto- 



& 



FIG. 99 A. Alveoli of the mammary gland of the goat at the time of 

 parturition. Beginning of fat formation, a, fat droplets in the epi- 

 thelium ; 6, division of the nucleus (daughter nuclei) ; c, leucocyte 

 in epithelium ; d, epithelial cell with protoplasmic prolongation ; 

 e, alveolar contents with cells ; /, free fat ; g, interalveolar connective 

 tissue. (After Martin.) 



plasm undergoes marked changes and the characteristic 

 globules of fat appear (Fig. 99A). This important func- 

 tion of the epithelial cells which line the finer sections into 

 which the lumen of the udder is divided can be demon- 



