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Biblioteca (s) : |
INIA Tacuarembó. |
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Fecha : |
30/05/2019 |
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Actualizado : |
30/05/2019 |
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Tipo de producción científica : |
Artículos en Revistas Indexadas Internacionales |
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Autor : |
SANTA CRUZ TORRES, R.; CUSHMAN, R.A.; VIÑOLES, C. |
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Afiliación : |
RODRIGO SANTA CRUZ TORRES, Pasante Programa Nacional de Investigación Producción Carne y Lana, INIA Tacuarembó. Polo Agroforestal, UdelaR, EEBR, Cerro Largo.; R.A. CUSHMAN, USDA, ARS, U.S. Meat Animal Research Center, Clay Center, NE, USA.; CAROLINA VIÑOLES GIL, INIA (Instituto Nacional de Investigación Agropecuaria), Uruguay. |
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Título : |
Antral follicular count is a tool that may allow the selection of more precocious Bradford heifers at weaning. |
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Fecha de publicación : |
2018 |
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Fuente / Imprenta : |
Theriogenology, v. 119, p. 35-42, 2018. |
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DOI : |
10.1016/j.theriogenology.2018.06.010 |
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Idioma : |
Inglés |
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Notas : |
Article history: Received 14 November 2017; Received in revised form 6 May 2018; Accepted 17 June 2018; Available online 19 June 2018. |
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Contenido : |
Although antral follicle count is a repeatable parameter across life that is positively associated with fertility, its use at weaning as a tool to discard less fertile heifers has not been extensively evaluated. The hypotheses of this work are: 1) maximum antral follicle count (MAFC) is repeatable between weaning and pre breeding evaluations, allowing selection of more fertile heifers at an early age, 2) heifers with high MAFC have growth and development parameters linked to an earlier puberty and regnancy, 3) MAFC has a positive correlation with AMH concentrations, so that both could be used inter changeably. In this study, Hereford (n ¼ 42 and n ¼ 50) and Braford (n ¼ 40 and n ¼ 50) females were used in years 1 and 2; respectively, in a completely randomized experimental design. Heifers were examined for five to ten days at two different moments (post weaning and pre service), to determine MAFC. The concentrations of Anti müllerian hormone (AMH) were evaluated on the day of MAFC assessment. Growth and development parameters were evaluated post weaning and pre service. The repeatability of MAFC between post weaning and pre service evaluations was poor in three cases (Hereford Year 1 ¼0.36 and 2 ¼ 0.39 and Braford, Year 2 ¼ 0.32) but it was high for Braford in Year 2 (0.72). The AMH repeatability between post weaning and pre service evaluations was high in one case (Braford Year 2 ¼ 0.72) and moderate in the others (Year 1, Hereford ¼ 0.50 and Braford ¼ 0.52 and Year 2, Hereford¼ 0.50). In Year 2, Braford heifers with greater MAFC attained puberty at an earlier age (r2 ¼ 0.129; P ¼ 0.0196). Also, diminished
MAFC corresponded with decreased growth and development, thus less Braford heifers with low MAFC were inseminated (2/16), compared to those with medium (12/17) and high MAFC (7/17; P < 0.01). Moreover, Braford heifers with low AFC had less progesterone in the cycle post insemination but pregnancy rate was not affected. In Braford heifers in Year 2, there was a high correlation between MAFC and AMH concentrations (0.85 P < 0.001). The results of these experiments indicate that post weaning MAFC and AMH concentrations may be applied to select those Braford heifers that attain puberty at an early age, but these tools are not useful in Hereford heifers. MenosAlthough antral follicle count is a repeatable parameter across life that is positively associated with fertility, its use at weaning as a tool to discard less fertile heifers has not been extensively evaluated. The hypotheses of this work are: 1) maximum antral follicle count (MAFC) is repeatable between weaning and pre breeding evaluations, allowing selection of more fertile heifers at an early age, 2) heifers with high MAFC have growth and development parameters linked to an earlier puberty and regnancy, 3) MAFC has a positive correlation with AMH concentrations, so that both could be used inter changeably. In this study, Hereford (n ¼ 42 and n ¼ 50) and Braford (n ¼ 40 and n ¼ 50) females were used in years 1 and 2; respectively, in a completely randomized experimental design. Heifers were examined for five to ten days at two different moments (post weaning and pre service), to determine MAFC. The concentrations of Anti müllerian hormone (AMH) were evaluated on the day of MAFC assessment. Growth and development parameters were evaluated post weaning and pre service. The repeatability of MAFC between post weaning and pre service evaluations was poor in three cases (Hereford Year 1 ¼0.36 and 2 ¼ 0.39 and Braford, Year 2 ¼ 0.32) but it was high for Braford in Year 2 (0.72). The AMH repeatability between post weaning and pre service evaluations was high in one case (Braford Year 2 ¼ 0.72) and moderate in the others (Year 1, Hereford ¼ 0.50 and Braford ¼ 0.52 and Year 2, Here... Presentar Todo |
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Palabras claves : |
ANTI MÜLLERIAN HORMONE; BEEF HEIFERS; FERTILITY; PUBERTY; REPLAEMENT SELECTION. |
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Asunto categoría : |
L01 Ganadería |
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Marc : |
LEADER 03134naa a2200229 a 4500
001 1059795
005 2019-05-30
008 2018 bl uuuu u00u1 u #d
024 7 $a10.1016/j.theriogenology.2018.06.010$2DOI
100 1 $aSANTA CRUZ TORRES, R.
245 $aAntral follicular count is a tool that may allow the selection of more precocious Bradford heifers at weaning.$h[electronic resource]
260 $c2018
500 $aArticle history: Received 14 November 2017; Received in revised form 6 May 2018; Accepted 17 June 2018; Available online 19 June 2018.
520 $aAlthough antral follicle count is a repeatable parameter across life that is positively associated with fertility, its use at weaning as a tool to discard less fertile heifers has not been extensively evaluated. The hypotheses of this work are: 1) maximum antral follicle count (MAFC) is repeatable between weaning and pre breeding evaluations, allowing selection of more fertile heifers at an early age, 2) heifers with high MAFC have growth and development parameters linked to an earlier puberty and regnancy, 3) MAFC has a positive correlation with AMH concentrations, so that both could be used inter changeably. In this study, Hereford (n ¼ 42 and n ¼ 50) and Braford (n ¼ 40 and n ¼ 50) females were used in years 1 and 2; respectively, in a completely randomized experimental design. Heifers were examined for five to ten days at two different moments (post weaning and pre service), to determine MAFC. The concentrations of Anti müllerian hormone (AMH) were evaluated on the day of MAFC assessment. Growth and development parameters were evaluated post weaning and pre service. The repeatability of MAFC between post weaning and pre service evaluations was poor in three cases (Hereford Year 1 ¼0.36 and 2 ¼ 0.39 and Braford, Year 2 ¼ 0.32) but it was high for Braford in Year 2 (0.72). The AMH repeatability between post weaning and pre service evaluations was high in one case (Braford Year 2 ¼ 0.72) and moderate in the others (Year 1, Hereford ¼ 0.50 and Braford ¼ 0.52 and Year 2, Hereford¼ 0.50). In Year 2, Braford heifers with greater MAFC attained puberty at an earlier age (r2 ¼ 0.129; P ¼ 0.0196). Also, diminished MAFC corresponded with decreased growth and development, thus less Braford heifers with low MAFC were inseminated (2/16), compared to those with medium (12/17) and high MAFC (7/17; P < 0.01). Moreover, Braford heifers with low AFC had less progesterone in the cycle post insemination but pregnancy rate was not affected. In Braford heifers in Year 2, there was a high correlation between MAFC and AMH concentrations (0.85 P < 0.001). The results of these experiments indicate that post weaning MAFC and AMH concentrations may be applied to select those Braford heifers that attain puberty at an early age, but these tools are not useful in Hereford heifers.
653 $aANTI MÜLLERIAN HORMONE
653 $aBEEF HEIFERS
653 $aFERTILITY
653 $aPUBERTY
653 $aREPLAEMENT SELECTION
700 1 $aCUSHMAN, R.A.
700 1 $aVIÑOLES, C.
773 $tTheriogenology$gv. 119, p. 35-42, 2018.
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INIA Tacuarembó (TBO) |
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| Registros recuperados : 4 | |
| 3. |  | SANTA CRUZ TORRES, R.; CUSHMAN, R.; VIÑOLES, C. Reserva folicular y pubertad. El recuento de folículos antrales es una herramienta que permitiría seleccionar terneras más precoces al destete. In: VIÑOLES, C.; SANTA CRUZ TORRES, R. (Eds.). Recuento de folículos antrales y concentraciones de hormona anti-Mülleriana: dos potenciales herramientas de selección de reemplazos //Antral follicle count and anti-Müllerian hormone concentrations: two potential replacement selection tools. Montevideo (UY): INIA, 2019. p. 19-35 (INIA Serie Técnica; 249) Trabajo publicado en la revista Theriogenology: Santa Cruz, R., Cushman, R.A., Vinoles, C., 2018. Antral follicular count is a tool that may allow the selection of more precocious Bradford heifers at weaning. Theriogenology 119, 35?42....| Tipo: Capítulo en Libro Técnico-Científico |
| Biblioteca(s): INIA Tacuarembó. |
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| 4. | | CUNHA, F.; CUSHMAN, R.A.; SANTA CRUZ, R.; DE NAVA, G.; VIÑOLES, C. Antral follicular count has limited impact in the selection of more fertile beef heifers. Livestock Science, November 2020, Volume 241, Article number 104230. Doi: https://doi.org/10.1016/j.livsci.2020.104230 Article history: Received 7 April 2020, Revised 20 July 2020, Accepted 25 August 2020, Available online 26 August 2020. Acknowledgments: This work was supported by the project ?Marcadores de Fertilidad para Ganado de Carne? of the...| Tipo: Artículos en Revistas Indexadas Internacionales | Circulación / Nivel : Internacional - -- |
| Biblioteca(s): INIA Tacuarembó. |
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| Registros recuperados : 4 | |
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