1. Alkass JE, Bryant JJ, Walton JS: Some effects of level of feeding and body conditions upon sperm production and gonadotrophin concentrations in the ram. An. Prod. 1982, 34, (265–273).
2. Azzarini M, Cardellino R: Algunas consideraciones sobre programas de mejoramiento genético del Corriedale del Uruguay (Some considerations about genetic improvement programmes for the Corriedale breed in Uruguay). SUL, Boletin Técnico No. 12, 1984.
3. Castrillejo A: Clinic survey of reproductive soundness in rams. Veterinaria (Uruguay) 1990, 26, (12–19).
4. Dunn RB: Puberty in Merino rams. Aust. vet. J. 1955, 31, (104–106).
5. Dýrmundsson OR: Puberty and early reproductive performance in sheep. II. Ram lambs. * An. Breed. Abstr. 1973, 41, (419–430).