THE HOG rNDUSTRY. 
179 
Towa experiments. Curtiss and Craig have reported the results of 
three years' feeding of purebred pigs of six leading breeds, includ- 
ing representatives of the Tamworth and Yorkshire breeds. WTiile 
bhe pigs were with the dam, records were kepi of all feed consumed 
and the loss or gain, and the loss or gain in weight of the sows was 
entered in the accounts of the total pork production before weaning. 
Benry reports the results of trials with 8 litters of pigs at the Wiscon- 
sin Station," when he found the feed required for 100 pounds gain by 
both sows and pigs before weaning to be little more than that required 
by the pigs alone after weaning. In the Iowa tests there was a very 
marked variation in the maintenance of flesh by the sows, which was 
perhaps due rather more to individual than to breed differences, and 
which had much to do with the economy of the feeding before wean- 
ing. The average cost of 100 pounds of gain for the three years' 
experiments, both for the sows and pigs before the latter were weaned, 
and for the pigs after weaning, was as follows : 
Cost of 100 pounds of gain before and after weaning.** 
Sows and 
Breed. pigs before 
weaning. 
Pigs after 
weaning. 
Breed. 
Sows and 
pigs before 
weaning. 
Pigs after 
weaning. 
Berkshire. fA 29 $2.33 
Duroc Jersey 
$5.61 
1.83 
2.22 
$2.27 
Poland China 3. 15 
2. 23 
2.46 
Yorkshire 
2.14 
Chester White 3.27 
2.42 
a Bui. No. 48, Iowa Expt, Sta. 
According to these figures, sows of the bacon breeds (Yorkshire 
and Tamworth) onty made cheaper gains with their pigs before wean- 
ing than the pigs alone after weaning. The Poland China sows showed 
the cheapest gains among those of the lard, or fat, type. 
After weaning the pigs, the Iowa Station b put on feed those that were 
in thrifty condition and compared the same breeds from this stand- 
point. The conditions of feed and management were as nearly alike 
as possible for each breed in each year's feeding. The nutritive ratio 
was 1 : 5.8 for all breeds in the first experiment, from 1 : 5.5 to 1 : 5.7 in 
the second, and from 1:7.1 in the third. The first year's work was 
nearly wrecked by hog cholera, so that the results of only a limited 
period, of time were published. The following table has been arranged 
from the results, to show the feeding record of each breed in each 
experiment and the average of each breed for the three years' feeding. 
« Feeds and Feeding, p. 541. 
&Bul. No. 48, Iowa Expt. Sta. 
