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Gonadal sperm reserves in the domestic fowl and its relation to age and breed under subtropical conditions

, : Gonadal sperm reserves in the domestic fowl and its relation to age and breed under subtropical conditions. Archiv fuer Gefluegelkunde 51(4): 144-149

The effect of age and breed on sperm production in the domestic fowl under the subtropical conditions of Egypt was studied. The technique of testicular homogenization and hemocytometric enumeration of elongated spermatids was applied. The study included 48 cocks of four different genotypes: Single Comb White Leghorn (SCWL), New Hampshire (NH), Barred Plymouth Rock (BPR) and a local Egyptain strain "Matrouh". Live body weight, testicular dimensions, testicular and epididymal weights and sperm reserves were investigated. Estimates were done at the age of 24 wks for SCWL and NH cockerels and at the age of 60 wks for adult cocks of all breeds. No significant differences were observed between the right and left gonads with respect to all characters studied. At the age of 24 wks, NH cockerels showed significantly smaller testes and less sperm reserves than SCWL cockerels of the same age. At the age of 60 wks, SCWL cocks had more active gonads than the other breeds studied. Testicular and epididymal sperm reserves per gram tissue were: 304.425 .times. 106, 1317.236 .times. 106; 191.786 .times. 106, 548.855 .times. 106; 241.643 .times. 106, 751.561 .times. 106 and 148.322 .times. 106 and 605.040 .times. 106 for 60 wks old cocks of SCWL, NH, BPR and Matrouh respectively. Both testicular and epididymal sperm reserves were found to be significantly correlated with each other. High correlations were also observed between gonads weights and their sperm reserves.

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