Effect of a new device for sustained progesterone release on the progesterone concentration, ovarian follicular diameter, time of ovulation and pregnancy rate of ewes.

Autor: Dias LM; Animal Reproduction Department, FMVZ/USP, CEP 05508-000, São Paulo-SP, Brazil. Electronic address: lilikirsch@gmail.com., de Barros MB; Animal Reproduction Department, FMVZ/USP, CEP 05508-000, São Paulo-SP, Brazil., Viau P; Animal Reproduction Department, FMVZ/USP, CEP 05508-000, São Paulo-SP, Brazil., Sales JN; Department of Veterinary Medicine, University of Lavras, Lavras, MG, Brazil., Valentim R; Animal Reproduction Department, FMVZ/USP, CEP 05508-000, São Paulo-SP, Brazil., dos Santos FF; Animal Reproduction Department, FMVZ/USP, CEP 05508-000, São Paulo-SP, Brazil., da Cunha MC Jr; Animal Reproduction Department, Dorper Campo Verde, CEP 13240-970, Jarinu-SP, Brazil., Marino CT; Brazilian Agricultural Research Corporation (Embrapa) - Beef Cattle, Campo Grande-MS, Brazil., de Oliveira CA; Animal Reproduction Department, FMVZ/USP, CEP 05508-000, São Paulo-SP, Brazil.
Jazyk: angličtina
Zdroj: Animal reproduction science [Anim Reprod Sci] 2015 Apr; Vol. 155, pp. 56-63. Date of Electronic Publication: 2015 Feb 10.
DOI: 10.1016/j.anireprosci.2015.01.016
Abstrakt: This study evaluated the effectiveness of a new progesterone intravaginal device (DPR) in ewes through four experiments: Experiment 1 compared the circulating progesterone concentration of ovariectomized ewes that received either a new or a re-used DPR. Experiment 2 compared the progesterone concentration between DPR-estrous-synchronized ewes and naturally estrous-cycling ewes. Experiment 3 evaluated the effect of new and re-used DPRs on ovarian follicular dynamics and time of ovulation of estrous cycling ewes. Experiment 4 compared the pregnancy rate after the use of a DPR and Controlled Internal Drug Releasing Device (CIDR). The mean concentration of progesterone released by the DPR device during its first use (New Group: 5.1 ± 0.5 ng/ml) was greater than that during the second use (Re-used Group: 2.4 ± 0.3 ng/ml). There was no difference between the animals that received DPR devices for first and second use in terms of ovulatory follicle diameter, follicular wave emergence day for ovulatory follicle and period of ovulatory wave of ovarian follicular development. However, there was a significant difference between groups regarding the time between DPR device removal and first ovulation (New Group: 71.7 ± 2.5h and Re-Used Group: 63.9 ± 2.7h). Pregnancy rates were similar between ewes with DPR and CIDR devices. It was concluded that DPR is effective in increasing and maintaining progesterone concentrations, controlling follicular dynamics, promoting synchronized times of ovulation from healthy follicles, promoting development of a competent corpus luteum and when used results in pregnancy rates similar to that with use of the CIDR.
(Copyright © 2015 Elsevier B.V. All rights reserved.)
Databáze: MEDLINE
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