Summer Feeding of the Breeding Herd 127 



averaging 325 pounds, which are maintained at a constant 

 weight for six months during the summer, or until the 

 beginning of the fall breeding season. 



Open yearling sows. 



If the gilts weigh about 250 pounds on the average 

 when they wean their litters in the spring, they should be 

 able to make a gain of 75 pounds during the succeeding 

 six months without becoming too fleshy. To make 

 375- to 400-pound sows in medium condition, they should 

 gain this much. The cost of this increase, with their 

 maintenance, will depend on the factors already discussed. 

 With fairly good pasture, no more than four pounds of 

 grain should be required to produce one pound of gain. 

 With these conditions, the cost will be as shown in Table 

 XXX. With legume forage crops, instead of only fair 

 pasture, the cost should be about 10 per cent less than 

 the figures given. 



TABLE XXX. COST OF FEEDING OPEN YEARLING Sow 

 6 MONTHS DURING SUMMER 



