Poultry Bulletin 



TABLE NO. 1 



DETAILED RESULTS OF FIRST OR MIDWINTER EXPERIMENT 



Yeast Pens 

 Pens 1 3 5 7 



From a study of table No. 1 it will be noticed that during January and 

 throughout February the fertility and hatch ability from both groups of 

 birds were about the same. In March, however, we see a decided gain 

 for the yeast fed pens. The fertility jumping from 81% in February to 

 95% in March and the hatchability from 51% in February to 72% in 

 March. While in the case of the non-yeast fed pens the fertility dropped 

 from 82% in February to 78% in March and the hatch dropped from 

 53% to 50% in March. This condition in the non-yeast fed pens is typical 

 of the regular late winter slump which is generally experienced in the 

 hatching business. In April the yeast fed birds continued to show a very 

 high fertility with an exceedingly satisfactory hatchability, and the same 

 condition continued throughout May. In the case of the non-yeast fed 

 pens an examination of the table will show a gradual increase in fertility 

 and hatchability throughout April and May until the average hatch in 

 May was nearly equal to the yeast-fed breeders. It is very apparent from 

 a careful examination of these figures that yeast played a very important 

 part in inducing high fertility and excellent hatchability during this sea- 

 son. It was apparent from the detailed records of hatch that it required 

 about ten days to two weeks feeding of yeast before its influence was ob- 

 served upon fertility. 



