395 



best record of her dam, these heifers have produced in quantity 

 of milk, from 1603.4 to 3714.3 pounds, or 45% to 75% more than 

 their dams and 50.33 to 82.08 pounds, or 27% to 41%, more but- 

 ter fat. When the average records for each are compared, in 

 spite of the fact that mature records of the scrubs are compared 

 with immature records of the heifers, as in the case of the best 

 records, it will be noted that the Holstein grades have produced 

 from 1901.0 to 2560.2 pounds, or 49% to 101%, more milk and 

 58.54 to 95.51 pounds, or 33% to 61%, more butter fat than 

 their dams. 



In the net returns column it will be noted that with the excep- 

 tion of no. 207, whose only record was made at one and a half 

 years of age, there is a good increase in returns in favor of the 

 heifers. No. 207, was bred too young and during her first lacta- 

 tion period required a great deal of feed for body growth, con- 

 sequently her returns are not as great as her dam's. The other 

 heifers show a considerable increase in net returns over their 

 dams. This increase ranges from $6.80 to $22.38 when the best 

 records are compared and the average net returns per lactation 

 are $7.70, to $12.28 more than that of their dams. 



In the case of the first generation Guernsey grades it will be 

 noticed that three of the four have thus far produced less than 

 their dams. By way of explanation, it may be stated that lack 

 of maturity of the heifers at the time records were made is no 

 doubt a factor of great importance, as is the fact that the scrub 

 cows nos. 6, 33, and 53, the dams of these three heifers, have the 

 highest average records of any of the scrubs with daughters by 

 purebred bulls. However, it is evident that a much greater 

 factor is the variation in the ability of different sires within a 

 breed to transmit dairy qualities. Heifers nos. 87 and 110 

 were sired by a Guernsey bull loaned to the station before a 

 Guernsey herd was owned by the college. Unfortunately records 

 of his purebred daughters as compared with their dam are not 

 available. However, the best record we have had from a first 

 generation heifer was made by no. 175. As a two year old this 

 heifer produced 6078.5 pounds of nr']k and 310.95 pounds of fat, 

 or 3049.9 pounds, or 101% more milk and 161 pounds, or 107% 

 more fat, and $2-4.48 more profit than her dam's best r:cord. This 

 halfblood Guernsey was sired bv our present herd bull and her 

 record compared to the other first generation Guern-fv grades 

 clearly indicates that variation in the ability of sire? *o transmit 

 dairv qualities is a factor of impor+pppe or id wo^hy of close study 

 by the man selecting a sire when the bull is to h^ used on a scrub 

 herd, as well as when selection is made for a hi^h grade or pure- 

 bred herd. 



The one first sreneration Jersey errade that has freshened to 

 date shows a good increase over her dam in butter fat production, 



