Abstracts. 219 



an offspring resembling the high line 2.2 times as closely as the 

 low line. The crosses of the second level in milk production to 

 the third level show that when the higher level is on the sire's 

 side the daughters resembled the high line 3.6 times as closely as 

 they did the low line. When this higher level is on the dam's 

 side the daughters resembled the high line 9.34 times as closely 

 as they did the low line. It seems doubtful from these results 

 if there are modifying sex linked factors present. 



INHERITANCE IN CROSSES OF DAIRY AND BEEF 

 BREEDS OF CATTLE. 



III. Transmission of Butter-Fat Percentage in the 

 First Generation.* 



This paper presents the facts on the inheritance of butter- 

 fat percentage as discovered by the analysis of the data accumu- 

 lated in the cross breeding experiment. Twelve crosses were 

 analyzed in this work. 



These observations may be regrouped to show the changes 

 brought about in the butter-fat percentage of the offspring in 

 accordance with the way the cross was made. For those crosses 

 in which Holstein-Friesian sire was used the offspring in all 

 cases resembled the low testing sire between 3.3 and 4.5 to 1 

 as closely as they did the high testing parent, the mean being 

 3.9 to 1. For those crosses in which the dam was of the Hol- 

 stein-Friesian breed the results of the offspring were contradic- 

 tory one approaching the butter-fat percentage of the high test 

 parent 1.4 to 1 and the other approaching the butter- fat test of 

 the low Holstein-Friesian cow 7.3 to 1. The cross involving 

 the Ayrshire dam resembled the low test 2.6 to 1. The high 

 test Guernsey dam when crossed to the lower test Aberdeen- 

 Angus sire had a daughter which resembled the low testing sire 

 5.5 times as closely as she did the high testing dam. 



Considering every cross irrespective of their merit for this 

 particular phase of the work the crosses resemble the low test- 

 ing parental breed 2.23 times as closely as they do the high test- 

 ing parental breed. 



*This is an abstract from a paper by John W. Gowen having the sams 

 title and published in Journal of Heredity, Vol. XI, No. 12. 



