Journal of Agricultural Research 



Vol. XV, No. I 



Table V. — Number, sex, and parentage of animals of the crossbred herd — Continued. 



Cali 

 No. 



Namd of sire and reg- 

 istry No. 



Taurus Creamelle 



Hengerveld (98482). 



Kayan (167617) 



Taurus Creamelle 



Hengerveld (98482). 



do 



Crossbred o. 



Taurus Creamelle 



Hengerveld (98482). 



do 



.do. 

 .do. 

 .do. 



Breed of sire. 



Holstein-Friesian 

 Aberdeen- Angus . 

 Holstein-Friesian 

 do 



Jersey - Holstein- 

 Friesian. 

 Holstein-Friesian 



.do. 

 .do. 

 .do. 

 .do. 



Name of dam and 

 registry No. 



Orono Madge 



(192781). 

 Pauline Posch 



(81048). 

 Lassie of M. F. 



(297736). 

 Hearthbloom 



(147141)- 

 Crossbred 11 



Crossbred 2 



E V e n t i m e 4th 



(155526). 

 Crossbred 12 



Orono Ellen 



(192783). 

 Rosalie (4887) 



Breed of dam. 



Aberdeen- Angus. 

 Holstein-Friesian. 

 Jersey. 

 Aberdeen- Angus. 



J e r s e y-Holstein- 



Friesian. 

 Holstein - Friesian- 



Guemsey. 

 Aberdeen- Angus. 



Holstein - Friesian- 



Guemsey. 

 Aberdeen- Angus. 



Jersey (MSJHB). 



An examination of Table V shows that at the beginning of the experi- 

 ment there was a large preponderence of males. This is shown graph- 

 ically in figure 2. 



f^ 





V///////////////X//////////////A 



^ 



H 



VA 



'^r\ 



M 



0: 



^ 



z 



s 



Fig. 2. — Diagram showing graphically the number and sex sequence of the births composing the crossbred 

 herd. The clear rectangles are female. The cross-hatched rectangles are the male. 



This preponderance of males is shown by figure 2 to be due to a large 

 excess of males in the first matings. In view of the fact that there is 

 probably no relation between the time of service and the sex of the 

 animals produced, this excess is to be explained on the basis of chance. 

 Unfortunately, this first excess of males in the birth has not been com- 

 pletely neutralized, but still leaves a good number of males over the 

 expected half. In the first 54 births there were 31 males to 23 females. 

 Since the segregation of the sex-determining elements probably takes 

 place in the male, it is interesting to see what is the relation between 

 the individual bulls in regard to the sex of the offspring produced. The 

 numbers as yet are rather too small to draw any definite conclusion, 

 but are still large enough to be of interest. Table VI gives such a 

 comparison of breeds. 



