COMPARISON BETWEEN ESTRADIOL CYPIONATE AND GONADOTROPIN RELEASING HORMONE AS OVULATION SYNCHRONIZATION TREATMENTS FOR FIXED-TIME ARTIFICIAL INSEMINATION PROGRAMS IN BRAHMAN-CROSS HEIFERS IN A SUBTROPICAL REGION OF NORTHEASTERN MEXICO

Synchronization protocols with intravaginal progesterone releasing devices (CIDR) and PGF2α were evaluated, with GnRH or estradiol cypionate (ECP) added for fixed-time artificial insemination (FTAI) in five counties in Tamaulipas, Mexico. Brahman-cross heifers (≥15 months old) were selected based...

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Detalles Bibliográficos
Autores: Dominguez, Miguel Angel, Villegas-Gutiérrez, C.I., González-Gómez, V.P., Sánchez-Torres, R., Benavides-González, F., López-Zavala, R., Medellín-Ledezma, J.A., Salinas-Chavira, J.
Tipo de recurso: artículo
Estado:Versión publicada
Fecha de publicación:2012
País:México
Institución:UNIVERSIDAD AUTÓNOMA DE YUCATÁN
Repositorio:Tropical and Subtropical Agroecosystems
Idioma:inglés
OAI Identifier:oai:ojs.www.revista.ccba.uady.mx:article/1415
Acceso en línea:https://www.revista.ccba.uady.mx/ojs/index.php/TSA/article/view/1415
Access Level:acceso abierto
Palabra clave:agriculture; veterinary; reproduction
ovulation synchronization; Brahman cattle; fixed-time AI; GnRH; estradiol
sincronización de la ovulación; Brahman; inseminación artificial a tiempo fijo; GnRH; estradiol.
Descripción
Sumario:Synchronization protocols with intravaginal progesterone releasing devices (CIDR) and PGF2α were evaluated, with GnRH or estradiol cypionate (ECP) added for fixed-time artificial insemination (FTAI) in five counties in Tamaulipas, Mexico. Brahman-cross heifers (≥15 months old) were selected based on body condition (≥3 on a 5-point scale) and confirmed ovarian activity. The six treatments (n = 320 each) were: T1 (9-d CIDR, ECP on insertion, PGF2α on day 9, ECP on day 10, FTAI 54 h after removal); T2 (7-d CIDR, ECP on insertion, PGF2α on day 7, ECP on day 8, FTAI 54 h after removal); T3 (7-d CIDR, GnRH on insertion, PGF2α on day 7, FTAI and GnRH 48 h after removal); T4 (7-d CIDR, GnRH on insertion, PGF2α on day 6, FTAI and GnRH 48 h after removal); T5 (7-d CIDR, GnRH on insertion, PGF2α on day 7, FTAI and GnRH 60 h after removal); and T6 (7-d CIDR, GnRH on insertion, PGF2α on day 7, FTAI alone 48 h after removal). Pregnancy was diagnosed ultrasonically 45 days after FTAI. Analyses included pregnancy rates and treatment costs (hormones and handling). Pregnancy rates ranged from 31.6 ± 3.9 to 48.0 ± 10.6%; neither treatment nor county affected these rates (p > 0.05). In conclusion, the inclusion of treatment costs showed two more economical treatments (T2 using estradiol or T3 using GnRH) under the nutritional, weather and handling conditions present in the tropical region of southeastern Tamaulipas.

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