Investigations with Smne. 



537 



together in a basket and immediately place them with the dam. 

 The pigs soon drained the udders of the dam, and directly this 

 was accomplished they were gathered into the basket and once 

 more weighed. The difference between the first and second 

 weights of the pigs was credited as milk yielded by the dam. 

 The sows used were pure-bred Poland- Chinas with the exception 

 of No. 4, which was a cross-bred Poland-China Chester White. 



826. Quantity of milk yielded. — As before stated, the yield of 

 milk by each sow was determined for periods of three days, the 

 first observation occui-ring shortly after farrowing. Subsequent 

 determinations were at intervals of about two weeks. The weights 

 of milk yielded by the several sows are given in the following 

 table: 



MUJc yielded daily by four sows, in pounds, avoirdupois — Wisconsin 

 Station. 



The table shows that the average daily milk yield ranged from 

 4.1 pounds with sow No. 2 to 5.8 pounds with sow No. 1. The 

 highest yield of milk on any one day was 8.7 pounds by sow 

 No. 1, twenty days after farrowing. (739) 



827. Composition of sow's milk. — During the experiment sam- 

 ples of the sows' milk were obtained and subjected to chemical 

 analysis. Great difficulty was experienced in securing the sam- 

 ples, the sows being quite unwilling to allow any milk to be drawn 



