i74 

 Breeders 



infertile 

 — deod qerros 



DECREASING POPULATION 



! Hiq\o r)es\ loss 



140 

 Br-««der3 



FIGURE 55. AVKRACK I.IKE EQUATION OF CROl SE POI'l I.ATION DECREASING I'RIMAIill.Y AS A 



RESULT OF III(;M NKST MORTALITY 



174 

 Breeders 



rD^^breediog loilure 

 dead cx'srr^^ 



WonVei 



DECREASING POPULATION 



(High br-ood loss 



125 

 BreedetrS 



FIGURE 56. AVERAGE LIFE EQUATION OF GROUSE POPULATION DECREASING PRIMARILY AS A 



RESULT OF HIGH RROOD ATORTAT.TTY 



