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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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Registro original : |
INIA Tacuarembó (TBO) |
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Biblioteca (s) : |
INIA La Estanzuela. |
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Fecha actual : |
10/07/2017 |
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Actualizado : |
17/07/2017 |
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Tipo de producción científica : |
Artículos en Revistas Indexadas Nacionales |
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Circulación / Nivel : |
Nacional - -- |
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Autor : |
BERETTA, A.; BASSAHUN, D.; TORRES, D.; MUSSELLI, R.; GARCIA, L. |
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Afiliación : |
ANDRES NICOLAS BERETTA BLANCO, INIA (Instituto Nacional de Investigación Agropecuaria), Uruguay; DANIEL FERNANDO BASSAHUN RODRIGUEZ, INIA (Instituto Nacional de Investigación Agropecuaria), Uruguay; DEBORAH LUCIANA TORRES GUERRERO, INIA (Instituto Nacional de Investigación Agropecuaria), Uruguay; BEATRIZ RAQUEL MUSSELLI NEGRIN, INIA (Instituto Nacional de Investigación Agropecuaria), Uruguay; LETICIA IRENE GARCIA BARRETO, INIA (Instituto Nacional de Investigación Agropecuaria), Uruguay. |
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Título : |
Acidez titulable a pH = 7 estimada a partir del pH de una mezcla suelo:buffer. (Titratable Acidity at pH = 7 Estimated from the pH of a Soil:Buffer Mixture). |
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Fecha de publicación : |
2017 |
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Fuente / Imprenta : |
Agrociencia Uruguay, v. 21, n.1, p. 105-108, 2017. |
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Idioma : |
Español |
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Notas : |
Article history: Recibido: 2015-11-19 Aceptado: 2016-11-23 |
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Contenido : |
Resumen:
El valor de acidez titulable a pH = 7 en suelo (AT_pH7) se utiliza con fines taxonómicos y para estimar la necesidad de
encalado. Es posible predecir AT_pH7 por el valor de pH de la mezcla suelo:solución buffer (pH_equilibrio). A cada muestra
se le agregó acetato de calcio buffereado a pH = 7, se midió el pH_equilibrio y el álcali necesario para llegar a pH=7. Con
pH_equilibrio se estimó AT_pH7 por regresión (AT_eq) o por la cantidad de álcali neutralizado para alcanzar el pH_equilibrio
(AT_OH). Existió un ajuste aceptable entre AT_pH7, AT_eq y AT_OH, pero sus diferencias no tuvieron distribución normal.
Con AT_OH y AT_eq, se subestimó el promedio de AT_pH7. El valor de pH_equilibrio fue más preciso que AT_pH7, en tanto
que las medidas AT_eq y AT_OH tuvieron menor precisión. Al utilizar AT_eq y AT_OH, no se introdujeron errores significativos
al clasificar los suelos por su saturación en bases. Ambas mediciones se realizaron en menor tiempo que AT_pH7. |
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Palabras claves : |
ACIDEZ POTENCIAL; BASE SATURATION; CAPACIDAD INTERCAMBIO; CATION EXCHANGE CAPACITY; CATIÓNICO; DESATURATED SOIL; POTENTIAL ACIDITY; SATURACIÓN EN BASES; SATURATED SOIL; SUELO DESATURADO; SUELO SATURADO. |
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Asunto categoría : |
P30 Ciencia del suelo y manejo del suelo |
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URL : |
http://www.ainfo.inia.uy/digital/bitstream/item/7064/1/Agrociencia-21-1p.105-108.pdf
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Marc : |
LEADER 02000naa a2200313 a 4500
001 1057361
005 2017-07-17
008 2017 bl uuuu u00u1 u #d
100 1 $aBERETTA, A.
245 $aAcidez titulable a pH = 7 estimada a partir del pH de una mezcla suelo$bbuffer. (Titratable Acidity at pH = 7 Estimated from the pH of a Soil:Buffer Mixture).$h[electronic resource]
260 $c2017
500 $aArticle history: Recibido: 2015-11-19 Aceptado: 2016-11-23
520 $aResumen: El valor de acidez titulable a pH = 7 en suelo (AT_pH7) se utiliza con fines taxonómicos y para estimar la necesidad de encalado. Es posible predecir AT_pH7 por el valor de pH de la mezcla suelo:solución buffer (pH_equilibrio). A cada muestra se le agregó acetato de calcio buffereado a pH = 7, se midió el pH_equilibrio y el álcali necesario para llegar a pH=7. Con pH_equilibrio se estimó AT_pH7 por regresión (AT_eq) o por la cantidad de álcali neutralizado para alcanzar el pH_equilibrio (AT_OH). Existió un ajuste aceptable entre AT_pH7, AT_eq y AT_OH, pero sus diferencias no tuvieron distribución normal. Con AT_OH y AT_eq, se subestimó el promedio de AT_pH7. El valor de pH_equilibrio fue más preciso que AT_pH7, en tanto que las medidas AT_eq y AT_OH tuvieron menor precisión. Al utilizar AT_eq y AT_OH, no se introdujeron errores significativos al clasificar los suelos por su saturación en bases. Ambas mediciones se realizaron en menor tiempo que AT_pH7.
653 $aACIDEZ POTENCIAL
653 $aBASE SATURATION
653 $aCAPACIDAD INTERCAMBIO
653 $aCATION EXCHANGE CAPACITY
653 $aCATIÓNICO
653 $aDESATURATED SOIL
653 $aPOTENTIAL ACIDITY
653 $aSATURACIÓN EN BASES
653 $aSATURATED SOIL
653 $aSUELO DESATURADO
653 $aSUELO SATURADO
700 1 $aBASSAHUN, D.
700 1 $aTORRES, D.
700 1 $aMUSSELLI, R.
700 1 $aGARCIA, L.
773 $tAgrociencia Uruguay$gv. 21, n.1, p. 105-108, 2017.
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