TY  - JOUR
T1  - Reproductive Performance in Dorper Ewes Synchronized at Estrus During non Breeding Season in Tropical Conditions
AU - Velasco-Zebadua, M.E. AU - Martinez-Priego, G. AU - Martinez-Tinajero, J.J. AU - Montanez-Valdez, O.D. AU - Ruiz-Herluver, I. AU - Izaguirre, F. 
JO  - Journal of Animal and Veterinary Advances
VL  - 10
IS  - 2
SP  - 221
EP  - 223
PY  - 2011
DA  - 2001/08/19
SN  - 1680-5593
DO  - javaa.2011.221.223
UR  - https://makhillpublications.co/view-article.php?doi=javaa.2011.221.223
KW  - Medroxiprogesterone
KW  -prolificacy
KW  -ovsynch
KW  -pregnancy
KW  -eCG
KW  -reproduction
KW  -ewes
AB  - With the objective to evaluate reproductive response in Dorper ewes were studied during non-breeding season under tropical conditions of Mexico. Ewes were randomly assigned to one of three treatments: T1 (n = 20): continuous breeding; T2 (n = 15): 65 mg Medroxiprogesterone Acetate (MPA)+500 I.U. equine Chorionic Gonadotrophin (eCG) at sponge removal+controlled breeding and T3 (n = 16): 100 μg of gonadotropin releasing hormone (GnRH) (Day 0) +7.5 mg of luprostiol (Day 5) and 100 μg of GnRH (Day 6.5). Estrus percentages were 65, 93.3 and 25% for T1, T2 and T3, respectively. The average pregnancy percentage was 43.7% with the higher value for T2 and the lower for T3 and the prolificacy percentage was 100% for all the treatments. It is was concluded that intravaginal sponges impregnated with 65 mg of medroxiprogesterone acetate used during 12 days, plus 500 I.U. of eCG, efficiently synchronized estrus in Dorper ewes whereas the ovsynch scheme presented low pregnancy and prolificacy percentage.
ER  -