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Abstract
Martínez, G., Urrutia, J., Martínez, L. and Meza-Herrera, C.A. 2005. Reproductive performance of Merino-Rambouillet prepubertal ewes under highland sub-tropical conditions. I. Timing of the breeding and anestrous seasons. J Appl. Anim. Res., 27: 21–24.
To characterize the ovarian activity in prepubertal Merino-Rambouillet ewes under highland production systems in central Mexico (19° 17′ NL) blood samples were collected from 20 prepubertal ewes (40.8±5.5 kg, 20 mo, stall-fed) twice per week for 12 months for serum progesterone (P4) concentration by RIA. The highest ovarian activity among all ewes was observed from July to December. The anestrous season was from March to May and the remaining being transition periods. Merino-Rambouillet maiden ewes under sub-tropical and highland conditions depicted an increased ovarian activity between June and December, with a non-profound anestrous period from March to May.