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3. Harper, J. A., 1949. A progress report on turkey research. Oregon Agr. Exp. Sta. Circ. of Info. No. 470.
4. Fertility in female chickens as affected by the injection of oxytocin and arginine vasopressin near the time of insemination;Hughes;Poultry Sci.,1972
5. Johnston, N. P., 1968. Time of insemination and oviposition as related to fertility of female domestic fowl. Master's Thesis. Corvallis, Oregon State Uni-versity. p. 80.