A total of 104 rams, 7-8 months of age, were given either no contact (NC), direct contact (DC) or fenceline (FL) exposure to oestrous ewes during a 3-week period in the autumn breeding season. When initially tested for sexual performance at 18-19 months, a higher proportion of NC rams exhibited no sexual interest in oestrous females compared with DC rams (59 and 15% respectively; P<0.002), results for FL rams were intermediate (38%). DC males also had a higher incidence of mounting than NC males (85 and 41% respectively; P<0.002), again results for FL rams were intermediate (57%). Treatment did not affect frequencies of mounting with and without ejaculation by the sexually active rams (P = 0.11 and 0.36, respectively). FL rams that were sexually inactive in year 2 spent less time (P<0.02) in year 1 within a body length of the fence separating them from the ewes than FL rams that were sexually active in year 2. FL proximity scores in year 1 were positively correlated (rs = 0.49; P<0.05) with ejaculation frequencies in year 2.
|Publication Title||Applied Animal Behaviour Science|
|Author Address||Department of Animal Science, University of California, Davis, CA 95616-8521, USA.|
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