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General Experimental Procedure ________________ e__ ____ __
Relation of Time of Laying to Time of Mating
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12 foot houses 16 foot pen 37 weeks AGRICULTURAL EXPERIMENT STATION April artiﬁcial illumination birds Bissonnette black walls Jan broody females BULLETIN 486 Cent Cent Cent complete spermatogenesis Days of Egg December December 11 deferens egg production Eggs Set exposed February 18 female turkeys fertility and hatchability ﬁrst Histological identiﬁed laying pens Light ﬁxtures light intensity male turkeys March mating frequency mating period matings per female mature spermatozoa November 19 October 17 Penn State turkey PENNSYLVANIA AGRICULTURAL EXPERIMENT prelighting period Primary spermatocytes regression reproductive activity Reproductive Condition reproductive response reproductive systems RESPONSE or TURKEYS roosting quarters secondary spermatocytes section from male Sertoli cells sexually mature shown in ﬁgure sperm Spermatogenic Development spermatozoa and spermatids spermatozoa in lumina Strain testes Testicular sections trapnests Trial tubules TURKEYS TO ILLUMINATION weeks Numerous spermatozoa weeks of age weeks of illumination white walls Jan willingness to mate