RELATION OF PERFORMANCE AND PRODUCTION 25 



from an animal differing more widely in form and mechanism 

 than any of those classed as food-producing animals. Meat 

 obtained from a milk-producing animal may be classed as a 

 by-product. Although a large proportion of meat products 

 are ultimately obtained from this source, the dairy animal 

 possesses a specific type and has a specific function in milk 

 production. Its purpose must therefore be so defined, and any 

 surplus obtained in meat or otherwise should be classed as a 

 by-product. In the dual purpose animal, the meat and milk- 

 giving functions are supposed to be equally correlated. The 

 degree of manifestation in either is arbitrary with the 

 breeder who may change the ratio of production by a simple 

 modification of the type through the natural source of 

 selection and reproduction. The sheep may be classed as a 

 dual purpose machine in one instance and as a specific 

 machine in the other. The mutton breeds of sheep are 

 bred for a specific purpose, although their wool is an impor- 

 tant by-product. In the strictly wool-producing breeds, the 

 mutton is a by-product being analogous in this respect to 

 meat from a dairy animal. 



The animal mechanism must of necessity vary greatly to 

 perform or manifest these various phases of production. 

 The relation between the machine and production is intimate 

 and it is only by having a definite knowledge of the former 

 that conformity to purpose or the power of production can 

 be accurately measured. 



RELATION OF MECHANISM TO PERFORMANCE AND 

 PRODUCTION. 



The form which an animal assumes is an embodiment of 

 the inner or unseen structure, more specifically of the bone 

 and muscle development. It is these two fundamentals 

 that directly or indirectly determine size, shape, locomotion, 

 compactness and disengagement or looseness of structure. 

 The draft horse is low set, massive, and compact. This 

 condition is a direct result of the structural units in the 

 mechanism. Every condition of development is a manifesta- 



