Animal Husbandry Investigations in 1916. 131 



The summarized results of 1313 separate and distinct mat- 

 ings given in Table 2 will demonstrate this point. In each one 

 of these 1313 cases the following facts were accurately known, 

 and reported in such a way that any bias, conscious or uncon- 

 scious, of the observer could not have influenced the result : 

 (a) the time in hours from the first appearance of heat (oes- 

 trum), as noticed by the breeder, to the time the cow was suc- 

 cessfully served; (b) the sex of the calf resulting from this ser- 

 vice. 



It is evident fromthis table that there is no significant pre- 

 ponderance of females when service is early in heat. There is 

 not now known any method by which the sex ratio or proportion 

 of the sexes in cattle may be effectively controlled by the breed- 

 er. A more detailed account of the results, together with fur- 

 ther statistics will be published elsewhere. 



