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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.

Authors
  • Olivera-Muzante, J1
  • Fierro, S2
  • Alabart, J L3
  • Claramunt, M4
  • Minteguiaga, M A5
  • Aunchayna, G6
  • Errandonea, N7
  • Banchero, G8
  • 1 Laboratorio de Reproducción Animal "Dr. Alfredo Ferraris", Departamento de Ovinos, Lanas y Caprinos, Facultad de Veterinaria, EEMAC, Universidad de la República, Ruta 3 km 363, 60000, Paysandú, Uruguay. Electronic address: [email protected] , (Uruguay)
  • 2 Secretariado Uruguayo de la Lana (S.U.L.), Área de Transferencia de Tecnología, Servando Gómez 2408, 12100, Montevideo, Uruguay. Electronic address: [email protected] , (Uruguay)
  • 3 Unidad de Producción y Sanidad Animal, Centro de Investigación y Tecnología Agroalimentaria de Aragón (CITA), Gobierno de Aragón, Av. Montañana 930, 50059, Zaragoza, Spain; Instituto Agroalimentario de Aragón - IA2 (CITA-Universidad de Zaragoza), Calle Miguel Servet 177, 50013, Zaragoza, Spain. Electronic address: [email protected] , (Spain)
  • 4 Grupo multidisciplinario de ecología para la agricultura, Centro Universitario Regional Este, Universidad de la República, Ruta 8 km 292, Treinta y Tres, Uruguay. Electronic address: [email protected] , (Uruguay)
  • 5 Laboratorio de Reproducción Animal "Dr. Alfredo Ferraris", Departamento de Salud en los Sistemas Pecuarios, Facultad de Veterinaria, EEMAC, Universidad de la República, Ruta 3 km 363, 60000, Paysandú, Uruguay. Electronic address: [email protected] , (Uruguay)
  • 6 Veterinary Doctor, Liberal Exercise of Profession, Mercedes, Soriano, Uruguay. Electronic address: [email protected] , (Uruguay)
  • 7 Veterinary Doctor, Liberal Exercise of Profession, Tomás Gomensoro, Artigas, Uruguay. Electronic address: [email protected] , (Uruguay)
  • 8 Instituto Nacional de Investigación Agropecuaria (INIA), Programa Nacional de Carne y Lana, Ruta 50 km 12, Colonia, Uruguay. Electronic address: [email protected] , (Uruguay)
Type
Published Article
Journal
Animal reproduction science
Publication Date
Jul 01, 2019
Volume
206
Pages
78–84
Identifiers
DOI: 10.1016/j.anireprosci.2019.05.011
PMID: 31153619
Source
Medline
Keywords
Language
English
License
Unknown

Abstract

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 × 2 experimental design. Ovulation rate on Day 8 (OR), non-estrous-return 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. Copyright © 2019 Elsevier B.V. All rights reserved.

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