Addition of eCG to a 14 d prostaglandin treatment regimen in sheep FTAI programs.

Autor: Cueto MI; Laboratorio de Reproducción de Rumiantes Menores, Instituto Nacional de Tecnología Agropecuaria EEA Bariloche, IFAB (INTA-CONICET), Modesta Victoria 4450, San Carlos de Bariloche, Río Negro, Argentina. Electronic address: cueto.marcela@inta.gob.ar., Bruno-Galarraga MM; Laboratorio de Reproducción de Rumiantes Menores, Instituto Nacional de Tecnología Agropecuaria EEA Bariloche, IFAB (INTA-CONICET), Modesta Victoria 4450, San Carlos de Bariloche, Río Negro, Argentina., Fernandez J; Laboratorio de Reproducción de Rumiantes Menores, Instituto Nacional de Tecnología Agropecuaria EEA Bariloche, IFAB (INTA-CONICET), Modesta Victoria 4450, San Carlos de Bariloche, Río Negro, Argentina., Fierro S; Secretariado Uruguayo de la lana (S.U.L), Área de Transferencia de Tecnología, Servando Gómez 2408, 12100. Montevideo, Uruguay., Gibbons AE; Laboratorio de Reproducción de Rumiantes Menores, Instituto Nacional de Tecnología Agropecuaria EEA Bariloche, IFAB (INTA-CONICET), Modesta Victoria 4450, San Carlos de Bariloche, Río Negro, Argentina.
Jazyk: angličtina
Zdroj: Animal reproduction science [Anim Reprod Sci] 2020 Oct; Vol. 221, pp. 106597. Date of Electronic Publication: 2020 Sep 07.
DOI: 10.1016/j.anireprosci.2020.106597
Abstrakt: In the present study, there was evaluation of the alternative of adding eCG as part of a long-interval prostaglandin-F 2α (PG) treatment on the reproductive efficiency of Merino sheep during the breeding season. A total of 210 ewes and 182 ewe lambs were randomly assigned to three experimental groups to induce the timing of estrus among ewes in a: Long-interval PG, group being synchronized using two doses of PG 14 days apart; Long-interval PG + eCG group being synchronized using the same treatment regimen as Group PG with the addition of 200 IU eCG to the regimen, administered concomitantly with the second PG administration; and MAP + eCG group being synchronized with intravaginal progestin sponges for 14 days plus 200 IU eCG, administered at the time of sponge removal. The percentage pregnancy rate in ewes of the MAP + eCG group was greater than the ewes of the Long-interval PG and Long-interval PG + eCG groups (76.4 % compared with 52.0 % and 62.5 %, respectively; P < 0.05). The prolificacy rate was greater in the ewes of the Long-interval PG+eCG group compared with the other groups (114 % compared with 100 % and 103 %, respectively; P < 0.05). When considering the fecundity rate, ewes of the Long-interval PG+eCG and MAP+eCG groups had greater values than ewes of the Long-interval PG group (71.2 % and 78.8 % compared with 52.0 %, respectively; P < 0.05). The Long-interval PG+eCG is an alternative to the conventional progestin sponge plus eCG treatment regimen with there being a greater fecundity rate when this regimen is used compared with the Long-term PG and similar to MAP-eCG treatment regimens.
(Copyright © 2020 Elsevier B.V. All rights reserved.)
Databáze: MEDLINE
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