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Animals 2019, 9(1), 9; https://doi.org/10.3390/ani9010009

Influence of Progesterone-Treatment Length and eCG Administration on Appearance of Estrous Behavior, Ovulatory Success and Fertility in Sheep

1
Departamento de Produccion y Sanidad Animal, Facultad de Veterinaria, Universidad Cardenal Herrera-CEU, CEU Universities, C/ Tirant lo Blanc, 7, Alfara del Patriarca, 46115 Valencia, Spain
2
Departamento de Reproduccion Animal, Instituto Nacional de Investigación y Tecnología Agraria y Alimentaria (INIA), Avda. Puerta de Hierro s/n. 28040 Madrid, Spain
3
Departamento de Toxicologia y Farmacologia, Facultad de Veterinaria, Universidad Complutense de Madrid, Ciudad Universitaria s/n. 28040 Madrid, Spain
*
Author to whom correspondence should be addressed.
Received: 25 November 2018 / Revised: 11 December 2018 / Accepted: 24 December 2018 / Published: 26 December 2018
(This article belongs to the Section Animal Reproduction)
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Simple Summary

This study examines the pre-ovulatory and ovulatory events (in terms of the timing of the onset of estrous and subsequent ovulation) and the yields obtained (in terms of ovulation rate, progesterone secretion, and fertility) after insertion of Controlled Internal Drug Release (CIDR) for five, six, seven, or fourteen days, with or without equine chorionic gonadotrophin (eCG).

Abstract

The present study characterizes, for sheep, the occurrence and timing of the onset of estrus behavior and ovulation and the yields obtained (ovulation rate, progesterone secretion, and fertility) after Controlled Internal Drug Release (CIDR) insertion for five, six, seven, or fourteen days, with or without equine chorionic gonadotrophin (eCG) in ewes of the Segureña meat breed. All the treatments showed above 80% of females displaying estrus, but the onset of estrus was earlier and more synchronized when using eCG and, among groups with eCG, onset of estrus was earlier in the sheep treated for 14 days than in the short-term treatments (p < 0.05 for all). Administration of eCG after either short- or long-term treatments assured the occurrence of fertile ovulations in all the animals. Conversely, ovulatory success without eCG was found to be dependent on treatment length, with a high percentage of animals ovulating after five days of treatment (83.3%) and very low percentages after treatment for six or seven days (40% and 20%, respectively). Ovulation rate and progesterone secretion were similar among animals ovulating, but ovulation failures predetermined the fertility yields obtained in response to the treatments. Hence, the best results were found after treatment for 14 days plus eCG, and for 5 days without eCG (83.3 for both, p < 0.05 when compared to the other groups with different treatment lengths and with or without eCG). View Full-Text
Keywords: CIDR; eCG; estrus synchronization; Fertility; Ovulation; Sheep CIDR; eCG; estrus synchronization; Fertility; Ovulation; Sheep
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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Martinez-Ros, P.; Rios-Abellan, A.; Gonzalez-Bulnes, A. Influence of Progesterone-Treatment Length and eCG Administration on Appearance of Estrous Behavior, Ovulatory Success and Fertility in Sheep. Animals 2019, 9, 9.

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