Previous research; Procedures; Pre-ejaculatory measurements; Ejaculation; Semen evaluation; Statistical analysis; Results and discussion; Population studied; Breeds of rams; Semen characteristics and scrotal circumference; Breeds; Ages; Bacterial isoltes; Ratings of rams; Effect of breed; Effect of age; Scrotal size; Response to breeding soundness examination and vaccination for REO; Conclusions and recommendations; Literature citedBulletin containing the results of a study of fertility characteristics in New Mexico range rams for the improvement of reproductive efficiency in sheep
