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 | Acceso al texto completo restringido a Biblioteca INIA Las Brujas. Por información adicional contacte bibliolb@inia.org.uy. |
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Registro completo
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Biblioteca (s) : |
INIA Las Brujas. |
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Fecha : |
09/07/2024 |
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Actualizado : |
09/07/2024 |
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Tipo de producción científica : |
Artículos en Revistas Indexadas Internacionales |
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Autor : |
CUADRO, F.; GARCÍA PINTOS, C.; NÚÑEZ-OLIVERA, R.; BROCHADO, C.; BÓ, G.A.; MENCHACA, A. |
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Afiliación : |
FEDERICO CUADRO, INIA (Instituto Nacional de Investigación Agropecuaria), Uruguay; Instituto de Reproducción Animal Uruguay, Fundación IRAUy, Montevideo, Uruguay; CAMILA GARCÍA PINTOS BARCIA, INIA (Instituto Nacional de Investigación Agropecuaria), Uruguay; Instituto de Reproducción Animal Uruguay, Fundación IRAUy, Montevideo, Uruguay; R. NÚÑEZ-OLIVERA, Instituto de Reproducción Animal Uruguay, Fundación IRAUy, Montevideo, Uruguay; C. BROCHADO, Instituto de Reproducción Animal Uruguay, Fundación IRAUy, Montevideo, Uruguay; G. A. BÓ, Instituto de Reproducción Animal Córdoba (IRAC), Córdoba, Argentina; Instituto A.P. de Ciencias Básicas y Aplicadas, Medicina Veterinaria, Universidad Nacional de Villa María, Villa del Rosario, Córdoba, Argentina; JOSE ALEJO MENCHACA BARBEITO, INIA (Instituto Nacional de Investigación Agropecuaria), Uruguay; ORCID: https://orcid.org/0000-0002-2494-9574; Instituto de Reproducción Animal Uruguay, Fundación IRAUy, Montevideo, Uruguay. |
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Título : |
Equine chorionic gonadotropin (eCG) treatment in heifers: Double ovulation, twinning rate, and pregnancy losses in twin pregnancies. |
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Complemento del título : |
Original Research Article. |
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Fecha de publicación : |
2024 |
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Fuente / Imprenta : |
Theriogenology, 2024, Volume 22, pages 213-218. https://doi.org/10.1016/j.theriogenology.2024.06.015 |
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ISSN : |
0093-691X |
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DOI : |
10.1016/j.theriogenology.2024.06.015 |
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Idioma : |
Inglés |
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Notas : |
Article history: Received 23 April 2024, Revised 18 June 2024, Accepted 20 June 2024, Available online 20 June 2024, Version of Record 24 June 2024, To be published 24 September 2024. -- Corresponding author: Instituto de Reproduccóon Animal Uruguay, Fundación IRAUy, Montevideo, Uruguay. E-mail address: menchaca.alejo@gmail.com (A. Menchaca). -- This study was supported by the Fundación IRAUy. Richard Núñez-
Olivera, Camila García Pintos, and Alejo Menchaca are fellows of Sistema Nacional de Investigadores (SNI) in Uruguay. |
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Contenido : |
ABSTRACT.- This study aimed to evaluate the effects of different doses of equine chorionic gonadotropin (eCG; 200 and 300 IU) administered at the end of a fixed-time artificial insemination (FTAI) treatment protocol on ovulation, pregnancy, and twin rates in Bos taurus beef heifers. In addition, pregnancy losses in heifers with singleton and twin pregnancies were determined. A total of 2382 Angus heifers treated with a 6-day estradiol/progesteronebased protocol for FTAI (J-Synch protocol) were randomly allocated to two experimental groups to receive 200 or 300 IU of eCG administered intramuscularly at the time of intravaginal progesterone device removal; FTAI was performed from 60 to 72 h after device removal. The pregnancy rate did not differ (P = 0.89) between the 200 and 300 IU eCG groups. The number of corpus luteum induced by both eCG doses was determined by ultrasonographic examination 14 days after insemination and those treated with 300 IU of eCG had a greater ouble ovulation rate (P < 0.05). In addition, 300 IU eCG treated heifers had a higher twinning rate on day 30 of gestation (P < 0.05) and parturition (P < 0.05). Pregnancy losses from 30 days of gestation to calving did not differ between heifers treated with 200 and 300 IU of eCG (P = 0.70). However, regardless of the experimental group, heifers bearing twins had greater pregnancy losses than heifers with singletons (P < 0.05). In conclusion, reducing the dose of eCG from 300 to 200 IU under FTAI treatment protocol decreases double ovulation and twinning rates, maintaining a similar pregnancy rate in heifers. Nulliparous cows carrying two fetuses suffer greater pregnancy losses than cows with singletons.
© 2024 Elsevier Inc. All rights are reserved, including those for text and data mining, AI training, and similar technologies. MenosABSTRACT.- This study aimed to evaluate the effects of different doses of equine chorionic gonadotropin (eCG; 200 and 300 IU) administered at the end of a fixed-time artificial insemination (FTAI) treatment protocol on ovulation, pregnancy, and twin rates in Bos taurus beef heifers. In addition, pregnancy losses in heifers with singleton and twin pregnancies were determined. A total of 2382 Angus heifers treated with a 6-day estradiol/progesteronebased protocol for FTAI (J-Synch protocol) were randomly allocated to two experimental groups to receive 200 or 300 IU of eCG administered intramuscularly at the time of intravaginal progesterone device removal; FTAI was performed from 60 to 72 h after device removal. The pregnancy rate did not differ (P = 0.89) between the 200 and 300 IU eCG groups. The number of corpus luteum induced by both eCG doses was determined by ultrasonographic examination 14 days after insemination and those treated with 300 IU of eCG had a greater ouble ovulation rate (P < 0.05). In addition, 300 IU eCG treated heifers had a higher twinning rate on day 30 of gestation (P < 0.05) and parturition (P < 0.05). Pregnancy losses from 30 days of gestation to calving did not differ between heifers treated with 200 and 300 IU of eCG (P = 0.70). However, regardless of the experimental group, heifers bearing twins had greater pregnancy losses than heifers with singletons (P < 0.05). In conclusion, reducing the dose of eCG from 300 to 200 IU under FTAI treatment pro... Presentar Todo |
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Palabras claves : |
Calving rate; Equine chorionic gonadotropin; Fixed-time artificial insemination; PLATAFORMA DE INVESTIGACIÓN EN SALUD ANIMAL - INIA; Pregnancy failure; Twinning rate. |
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Asunto categoría : |
L53 Fisiología Animal - Reproducción |
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Marc : |
LEADER 03350naa a2200289 a 4500
001 1064724
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022 $a0093-691X
024 7 $a10.1016/j.theriogenology.2024.06.015$2DOI
100 1 $aCUADRO, F.
245 $aEquine chorionic gonadotropin (eCG) treatment in heifers$bDouble ovulation, twinning rate, and pregnancy losses in twin pregnancies.$h[electronic resource]
260 $c2024
500 $aArticle history: Received 23 April 2024, Revised 18 June 2024, Accepted 20 June 2024, Available online 20 June 2024, Version of Record 24 June 2024, To be published 24 September 2024. -- Corresponding author: Instituto de Reproduccóon Animal Uruguay, Fundación IRAUy, Montevideo, Uruguay. E-mail address: menchaca.alejo@gmail.com (A. Menchaca). -- This study was supported by the Fundación IRAUy. Richard Núñez- Olivera, Camila García Pintos, and Alejo Menchaca are fellows of Sistema Nacional de Investigadores (SNI) in Uruguay.
520 $aABSTRACT.- This study aimed to evaluate the effects of different doses of equine chorionic gonadotropin (eCG; 200 and 300 IU) administered at the end of a fixed-time artificial insemination (FTAI) treatment protocol on ovulation, pregnancy, and twin rates in Bos taurus beef heifers. In addition, pregnancy losses in heifers with singleton and twin pregnancies were determined. A total of 2382 Angus heifers treated with a 6-day estradiol/progesteronebased protocol for FTAI (J-Synch protocol) were randomly allocated to two experimental groups to receive 200 or 300 IU of eCG administered intramuscularly at the time of intravaginal progesterone device removal; FTAI was performed from 60 to 72 h after device removal. The pregnancy rate did not differ (P = 0.89) between the 200 and 300 IU eCG groups. The number of corpus luteum induced by both eCG doses was determined by ultrasonographic examination 14 days after insemination and those treated with 300 IU of eCG had a greater ouble ovulation rate (P < 0.05). In addition, 300 IU eCG treated heifers had a higher twinning rate on day 30 of gestation (P < 0.05) and parturition (P < 0.05). Pregnancy losses from 30 days of gestation to calving did not differ between heifers treated with 200 and 300 IU of eCG (P = 0.70). However, regardless of the experimental group, heifers bearing twins had greater pregnancy losses than heifers with singletons (P < 0.05). In conclusion, reducing the dose of eCG from 300 to 200 IU under FTAI treatment protocol decreases double ovulation and twinning rates, maintaining a similar pregnancy rate in heifers. Nulliparous cows carrying two fetuses suffer greater pregnancy losses than cows with singletons. © 2024 Elsevier Inc. All rights are reserved, including those for text and data mining, AI training, and similar technologies.
653 $aCalving rate
653 $aEquine chorionic gonadotropin
653 $aFixed-time artificial insemination
653 $aPLATAFORMA DE INVESTIGACIÓN EN SALUD ANIMAL - INIA
653 $aPregnancy failure
653 $aTwinning rate
700 1 $aGARCÍA PINTOS, C.
700 1 $aNÚÑEZ-OLIVERA, R.
700 1 $aBROCHADO, C.
700 1 $aBÓ, G.A.
700 1 $aMENCHACA, A.
773 $tTheriogenology, 2024, Volume 22, pages 213-218. https://doi.org/10.1016/j.theriogenology.2024.06.015
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