Types and Market Classes of Live Stock 



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developed partition as between the halves, nor can the line of separation 

 be seen unless the tissues are stained. Dr. A. W. Bitting of the Indiana 

 Experiment Station injected different colored liquids through the teats 

 and found that the liquids did not leave the quarter, his investigation 

 showing that a rather distinct transverse partition exists. It follows 

 that milk drawn from any teat must be produced in its quarter, al- 

 though there is slight communication between the smaller ducts in the 

 upper parts of the two quarters on a side. Between the quarters of 

 the same half, the capsule sends off a rather incomplete transverse 

 partition common to both, and there are numerous other reflections 



Fig. 64. — Cross-section of cow's udder, a, Body of gland; b, milk cistern; 

 c, cavity of teat; d, duct of teat; e, inter-mammary groove; f, septum between glands; 

 g, supramammary fat. 



of the capsule inward from all sides to serve as a supporting framework 

 for the gland tissue and to form the milk cisterns and ducts. 



Structure of the teat. — The tissues of the capsule are prolonged 

 downward, becoming greatly thickened, to form the walls of the teats. 

 The teat is cylindrical or conical in shape, variable in length and 

 diameter, and placed at the lowest portion of the gland. Its shape and 

 size are independent of the size of the gland. It is very elastic and is 

 covered with a tough, close-fitting, thin skin. Through its center runs 



