132 



poni/riiY PRODvcrioy! 



Association of Instructors and Investigators in Poultry 

 Husbandry \\ itli offices at tlic New Jersey Agricultural 

 Experiment Station, Xcw Brunswick, Xew .lerse\'. 



In New York state a system of eertifyinn' flocks \\liicli 

 come u]) to a recognized standard regarding production is 

 administered liy tlie New York State College of Agriculture 

 at < drncll l'ni\ ersit>'. 



Yu: r,-, 



A cross-lireri lirn (-;in\\-ini^ 1 hror-n^htlis Jiarrril Pl>'nioufh Rock lilonrl 

 and (ive-ciHliths Siniilc ('(mil) WliiI.e Leghorn. Egg record, 2'Jl in twelve 

 months. (Courtesy of (Oregon Agricultural Experiment Station) 



Cross-breeding. — Two kinds of cross-l)reeding are practised. 

 With the first, which is used in endeavoring to find a new 

 comliination of eluiracters or cjutdities and thus form a new 

 breed, individuals of different hreeds whose blended characters 

 it is h(.)])ed \\ill approach the combination sought, are mated 

 and selected i)rogeny of the cross are used as breeders for 

 further oi)erations. An illustration of this is foumi in the 

 formation of the American breeds. 



With the second the two breeds are kept in their i)urity, 



