Reproduction in the Male

  • A. L. Johnson


Testes of the male bird are paired, and unlike those of most mammals are located within the body cavity, ventral and toward the cephalic border of the kidneys (Figure 19–1). Each testis is attached to the body wall by the mesorchium and is encapsulated by a fibrous inner coat, the tunica albuginea, and a thin outer layer, the tunica vaginalis. One or the other of the two testes may be larger, depending on the species (Lofts and Murton, 1973; Lake, 1981), but both are functional. The weight of the testes in chickens constitutes about 1% of the total body weight, or about 9–30 g per testis at sexual maturity, depending on the breed (Sturkie and Opel, 1976). In seasonal breeders, testis size may increase by 300- to 500-fold during the reproductively active season as compared to the nonbreeding state.


Luteinizing Hormone Sertoli Cell Leydig Cell Seminiferous Tubule Japanese Quail 
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