REVIEW 291 
and to bring about steady improvement, constant thought is 
necessary. One cannot expect to get maximum results or superi- 
ority in his flock without more or less continuous care in selection 
and mating. 
© Co N oOoaPPwnre 
REVIEW. 
. What is the chief object in managing breeding stock? 
. Discuss the desirability of selected matings for breeding purposes. 
. Discuss six points which should be considered in selecting breeding birds. 
. What is the most desirable age for breeding stock? 
. Give five disadvantages resulting from using pullets as breeders. 
. Discuss conditions regulating the number of males and females in the 
breeding pen. 
. Give three features which require special consideration during the mating 
season. 
. What four special points should be considered in feeding breeders? 
. What points do you consider of special significance in collecting eggs for 
hatching? 
. What points should be considered when selecting hatching eggs? 
. Mention three factors which affect the keeping quality of hatching eggs. 
. Give nine causes which tend to produce infertility. 
. Mention four causes of apparent infertility or early death of the embryo. 
. What five points are of special significance in the care of young breeders 
until maturity? 
. Compare the wild bird and the domesticated species in reference to re- 
production and artificial breeding. 
Reference.—Fertility of Eggs, North Dakota Farmers’ Bulletin 251. 
