BIOLOGY OF AGEIOULTUEAL PRODUCTION 103 



for a full year. The best 25 per cent produced 301 pounds of 

 butter fat per year ; the lowest 25 per cent only 133.5 pounds. 

 He concludes from the experiment as follows : " If it costs $30 

 a year to feed the poorer cows and $38 a year to feed the better 

 ones, then at present prices a herd of 25 of the better will 

 produce as much net profit as would 1000 of the poorer cows." 

 The Holstein, Banostine Belle de Kol, held the world's 

 record for butter fat in 1912 1058 pounds in one year. 



By courtesy of the Ohio Farmer 



FIG. 49. Banostine Belle de Kol 



According to above figures, five such cows would yield the 

 net product of 25 of the better dairy cows, and their calves 

 might be worth even more for breeding purposes. The highest 

 dairy record for 1913 is 1073 pounds of butter fat, scored by 

 May Rilma, a Guernsey. And so progress in every branch of 

 agriculture becomes a game which, if well played, may ever 

 ' lighten and sweeten toil." 



Poultry offers perhaps the most practicable field for ele- 

 mentary experiments in the breeding and care of animals, and 



