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The authors thank to Dr. Jorge Gil, Martin Hitateguy and Luis Albarenga for the help with the field work and processing of records. We acknowledge to 'El Recuerdo' farm (Errandonea-Ltipez family) for their support with animals and resources. This research was supported by the Laboratory of Animal Reproduction Dr. Alfredo Ferraris and Faculty of Veterinary, Universidad de la Republica. Paysandu, Uruguay.

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Short-term dietary protein supplementation improves reproductive performance of estrous-synchronized ewes when there are long intervals of prostaglandin or progesterone-based treatments for timed AI

Publicado en:Animal Reproduction Science. 206 78-84 - 2019-07-01 206(), DOI: 10.1016/j.anireprosci.2019.05.011

Autores: Olivera-Muzante, J; Fierro, S; Alabart, J L; Claramunt, M; Minteguiaga, M A; Banchero, G

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To evaluate the reproductive effects of a short-term dietary protein supplementation (Days-10 to -3) before timed AI (TAI = Day 0), 471 Merino ewes grazing native pastures were estrous-synchronized when there were either long intervals between prostaglandin administrations (two prostaglandin injections 15 or 16 d apart; PG15 and PG16, respectively) or with a progesterone. eCG (P4-eCG) protocol, resulting in a 3 x 2 experimental design. Ovulation rate on Day 8 (OR), non-estrous-retum to Day 21 (NRR21), and fertility, prolificacy and fecundity on Day 70 were evaluated. The interaction between estrous synchronization protocol and supplementation was not significant for any of these variables (P > 0.05). Supplementation increased OR, prolificacy and fecundity (+ 0.14, +0.15 and + 0.14, respectively, P < 0.01), but did not affect NRR21 or fertility of ewes (+ 6.2% and + 6.7% respectively, P > 0.05). Ewes treated using the PG15 and PG16 protocols had a lesser OR (-0.27), prolificacy (-0.22) and fecundity (-0.20) than ewes treated using P4-eCG protocol (P < 0.01 for each), and similar NRR21 and fertility (-5.4% and -7.9% respectively, P > 0.05 for both variables), without significant differences between the PG15 and PG16 groups. In conclusion, a short-term dietary protein supplementation before TAI improved OR, prolificacy and fecundity of ewes which were estrous-synchronized by imposing long interval PG (15 or 16 d apart) or P4-eCG-based protocols. There was a greater OR, prolificacy and fecundity when there was use of the P4-eCG compared to long interval PG-based protocols. Estrous-non-return rate after AI and fertility as a result TAI were not affected by either the supplementation or the estrous synchronization protocols used.

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