January, 1938] Dairy Herd Replacements 13 



which freshened at more than 30 months of age utilized pasture for 59 

 days in the third season. The average per cent of total heifer days that 

 were spent on pasture tended 1o increase somewhat with age of fresh- 

 ening. 



The per cent of herd purebred had no significant effect on the feed 

 costs of raising heifers. 



The 45 farmers who were raising cows for sale as well as for replace- 

 ments were raising heifers at an average feed cost of approximately $5 

 less than those who were raising only for replacements. This is in view 

 of the fact that heifers from the former group of farms were first turned 

 out to pasture at an average of 1.2 months older age. There was no sig- 



Table 7. Relation of per cent of total heifer days spent on pasture to feed 

 costs of raising a heifer, and other factors. 



Table 8. Relation of age at first freshening to feed costs of raising a heifer, 



(ind other factors. 



nificant difference between the two groups with respect to average length 

 of pasture season, average age at first freshening or average per cent of 

 total heifer days spent on pasture. Some of the difference in feed costs 

 can be accounted for by the fact that this group included 21 of the 55 

 farms which had fresh skim milk to feed and 11 of the 28 farms feeding 



