Estrous synchronization in hair sheep using a protocol based on prostaglandin + GnRH

Estrous synchronization in hair sheep using a protocol based on prostaglandin + GnRH

The use of progestogens can contaminate the environment and animal tissue. Therefore, the use of prostaglandins F2α (PGF2α) and gonadotropin-releasing hormone (GnRH) may represent a viable alternative. The aim of the present work was to evaluate the effect of applying a dose of GnRH within the range...

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Main Authors: Ávila-Castillo, Blas Rogelio, García-Flores, Enrique Octavio, Molina-Mendoza, Pedro, Peralta-Ortiz, J. Jesús Germán, Sánchez-Torres-Esqueda, María Teresa
Format: Online
Language:spa
Published: Universidad Autónoma de Tamaulipas 2019
Online Access:https://revistaciencia.uat.edu.mx/index.php/CienciaUAT/article/view/1012
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id oai:ojs.pkp.sfu.ca:article-1012
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institution CIENCIA UAT
collection OJS
language spa
format Online
author Ávila-Castillo, Blas Rogelio
García-Flores, Enrique Octavio
Molina-Mendoza, Pedro
Peralta-Ortiz, J. Jesús Germán
Sánchez-Torres-Esqueda, María Teresa
spellingShingle Ávila-Castillo, Blas Rogelio
García-Flores, Enrique Octavio
Molina-Mendoza, Pedro
Peralta-Ortiz, J. Jesús Germán
Sánchez-Torres-Esqueda, María Teresa
Estrous synchronization in hair sheep using a protocol based on prostaglandin + GnRH
author_facet Ávila-Castillo, Blas Rogelio
García-Flores, Enrique Octavio
Molina-Mendoza, Pedro
Peralta-Ortiz, J. Jesús Germán
Sánchez-Torres-Esqueda, María Teresa
author_sort Ávila-Castillo, Blas Rogelio
title Estrous synchronization in hair sheep using a protocol based on prostaglandin + GnRH
title_short Estrous synchronization in hair sheep using a protocol based on prostaglandin + GnRH
title_full Estrous synchronization in hair sheep using a protocol based on prostaglandin + GnRH
title_fullStr Estrous synchronization in hair sheep using a protocol based on prostaglandin + GnRH
title_full_unstemmed Estrous synchronization in hair sheep using a protocol based on prostaglandin + GnRH
title_sort estrous synchronization in hair sheep using a protocol based on prostaglandin + gnrh
description The use of progestogens can contaminate the environment and animal tissue. Therefore, the use of prostaglandins F2α (PGF2α) and gonadotropin-releasing hormone (GnRH) may represent a viable alternative. The aim of the present work was to evaluate the effect of applying a dose of GnRH within the range of application of two doses of PGF2α, and compare it with protocols based on progestogens and PGF2α, commonly used in the synchronization of estrus, with respect to the pre-ovulatory peak of luteinizing hormone (LH), post-estrus progesterone concentrations, pregnancy rate, calving and prolificacy. After a pre-synchronization with a double application of PGF2α, 30 multiparous adult ewes (live weight = 45 ± 3.1 kg, body condition = 3.2 ± 0.5 units and postpartum time = 60 d to 90 d, they were randomly assigned to one of three treatments (n = 10). The ewes in Group 1: P (Control) received a single dose of 125 μg of cloprostenol via IM (intramuscular); the ewes in Group 2: FP received intravaginal sponges containing 20 mg of fluorogestone acetate for 5 d; and upon removal of the sponge, they were injected with 125 μg of cloprostenol via IM; the ewes in Group 3: GP received 50 μg of GnRH IM; and 7 d later, they were injected with 125 μg of cloprostenol. The onset of estrus was detected faster (P ≤ 0.05) in P and GP groups than in the FP group. The GP group (P ≤ 0.05) had higher concentrations of progesterone after 5 d post-estrus, compared to the P and FP groups. The pregnancy rate was not different (P > 0.05) between groups. All the synchronization protocols evaluated were similar in the effectiveness to improve the reproductive behavior in hair sheep. Therefore, the use of protocols based on the application of PGF2α is recommended due to their ease of application.
publisher Universidad Autónoma de Tamaulipas
publishDate 2019
url https://revistaciencia.uat.edu.mx/index.php/CienciaUAT/article/view/1012
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spelling oai:ojs.pkp.sfu.ca:article-10122020-01-29T09:32:38Z Estrous synchronization in hair sheep using a protocol based on prostaglandin + GnRH Sincronización del estro en ovejas de pelo mediante protocolo basado en prostaglandinas + GnRH Ávila-Castillo, Blas Rogelio García-Flores, Enrique Octavio Molina-Mendoza, Pedro Peralta-Ortiz, J. Jesús Germán Sánchez-Torres-Esqueda, María Teresa corpus luteum progesterone luteinizing hormone estrus gestation cuerpo lúteo progesterona hormona luteinizante estro gestación The use of progestogens can contaminate the environment and animal tissue. Therefore, the use of prostaglandins F2α (PGF2α) and gonadotropin-releasing hormone (GnRH) may represent a viable alternative. The aim of the present work was to evaluate the effect of applying a dose of GnRH within the range of application of two doses of PGF2α, and compare it with protocols based on progestogens and PGF2α, commonly used in the synchronization of estrus, with respect to the pre-ovulatory peak of luteinizing hormone (LH), post-estrus progesterone concentrations, pregnancy rate, calving and prolificacy. After a pre-synchronization with a double application of PGF2α, 30 multiparous adult ewes (live weight = 45 ± 3.1 kg, body condition = 3.2 ± 0.5 units and postpartum time = 60 d to 90 d, they were randomly assigned to one of three treatments (n = 10). The ewes in Group 1: P (Control) received a single dose of 125 μg of cloprostenol via IM (intramuscular); the ewes in Group 2: FP received intravaginal sponges containing 20 mg of fluorogestone acetate for 5 d; and upon removal of the sponge, they were injected with 125 μg of cloprostenol via IM; the ewes in Group 3: GP received 50 μg of GnRH IM; and 7 d later, they were injected with 125 μg of cloprostenol. The onset of estrus was detected faster (P ≤ 0.05) in P and GP groups than in the FP group. The GP group (P ≤ 0.05) had higher concentrations of progesterone after 5 d post-estrus, compared to the P and FP groups. The pregnancy rate was not different (P > 0.05) between groups. All the synchronization protocols evaluated were similar in the effectiveness to improve the reproductive behavior in hair sheep. Therefore, the use of protocols based on the application of PGF2α is recommended due to their ease of application. El uso de progestágenos puede contaminar el medio ambiente y el tejido animal, por lo que el uso de prostaglandinas F2α (PGF2α) y hormona liberadora de gonadotropinas (GnRH) pueden representar una alternativa viable. El objetivo del presente trabajo fue evaluar el efecto de aplicar una dosis de GnRH en el intervalo de aplicación de dos dosis de PGF2α, y compararlo con protocolos basados en progestágenos y PGF2α, comúnmente utilizados en la sincronización de estros, con respecto al pico pre-ovulatorio de la hormona luteinizante (LH), concentraciones de progesterona post-estro, tasa de preñez, pariciones y prolificidad. Después de una pre-sincronización con doble aplicación de PGF2α, 30 ovejas adultas multíparas (peso vivo = 45 ± 3.1 kg, condición corporal= 3.2 ± 0.5 unidades y tiempo post-parto = 60 d a 90 d) fueron asignadas aleatoriamente a uno de tres tratamientos (n = 10). Grupo 1: P (Testigo), recibieron dosis única de 125 μg de cloprostenol por vía IM (intramuscular); Grupo 2: FP, recibieron esponjas intravaginales que contenían 20 mg de acetato de fluorgestona por 5 d, y al retiro de la esponja fueron inyectadas con 125 μg de cloprostenol vía IM; Grupo 3: GP, recibieron 50 μg de GnRH IM, y 7 d después  fueron inyectadas con 125 μg de cloprostenol. El inicio del estro fue más rápido (P ≤ 0.05) en el grupo P comparado con el grupo FP. El grupo GP (P ≤ 0.05) tuvo mayores  concentraciones de progesterona después de 5 d post-estro, comparado con los grupos P y FP. La tasa de preñez no fue diferente (P > 0.05) entre grupos. Los protocolos de sincronización evaluados fueron semejantes en su efectividad para mejorar el comportamiento reproductivo en ovejas de pelo. Se recomienda usar protocolos basados en su aplicación de PGF2α, debido a su facilidad de aplicación. Universidad Autónoma de Tamaulipas 2019-01-31 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion application/pdf text/html application/xml https://revistaciencia.uat.edu.mx/index.php/CienciaUAT/article/view/1012 10.29059/cienciauat.v13i2.1012 CienciaUAT; Vol 13 No. 2. January-June 2019; 141-151 CienciaUAT; Vol. 13 No. 2: Enero-Junio 2019; 141-151 2007-7858 2007-7521 spa https://revistaciencia.uat.edu.mx/index.php/CienciaUAT/article/view/1012/552 https://revistaciencia.uat.edu.mx/index.php/CienciaUAT/article/view/1012/561 https://revistaciencia.uat.edu.mx/index.php/CienciaUAT/article/view/1012/692 Derechos de autor 2019 CienciaUAT

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