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Can the ram effect, or the ram effect plus PMSG be used to advance the breeding season of Southdown ewes?



Can the ram effect, or the ram effect plus PMSG be used to advance the breeding season of Southdown ewes?



Proceedings of the Australian Society of Animal Production 15: 505-508



23% of seasonally anovular Southdown ewes ovulated within 5 days of introducing Southdown rams (the "ram effect") on 10 Dec. Priming the ewes with MAP from intravaginal sponges for 12 days immediately before the introduction of the rams ensured that most of the ewes displayed oestrus at the ram-induced ovulation. The proportion of anovular ewes ovulating increased as the date of joining moved from Dec. (4 out of 25) to Feb. (15 out of 16).

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