oa Agroanimalia - The seasonal pattern of oestrus amongst ewes as affected by isolation from and joining with rams

Volume 1, Issue 3-4
  • ISSN : 0302-7104



During October 1966 a flock of Merino-type ewes was isolated from contact with rams. At 30 day intervals, commencing on February 1, 1966 a separate group of ewes was randomly selected from the isolated flock and joined with sterile teaser rams. A total of 12 groups of ewes was joined with rams and observations for oestrus were continued until March 26, 1967. During the 17 day periods the level of oestrous activity amongst ewes which had been isolated from rams was significantly lower than that amongst ewes which had been associated with rams for at least 30 days.

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