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Registro completo
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Biblioteca (s) : |
INIA Las Brujas. |
Fecha : |
21/02/2014 |
Actualizado : |
04/02/2019 |
Tipo de producción científica : |
Artículos en Revistas Indexadas Internacionales |
Autor : |
DE MATTOS, D.; MISZTAL, I.; BERTRAND, J. K. |
Afiliación : |
DANIEL DE MATTOS, INIA (Instituto Nacional de Investigación Agropecuaria), Uruguay; I. MISZTAL, Animal and Dairy Science Department, University of Georgia, United States.; J. K. BERTRAND. |
Título : |
Variance and covariance components for weaning weight for Herefords in three countries. |
Fecha de publicación : |
2000 |
Fuente / Imprenta : |
Journal of Animal Science, January 2000, volume 78, Issue 1, pages 33-37. OPEN ACCESS. |
ISSN : |
0021-8812 |
DOI : |
10.2527/2000.78133x |
Idioma : |
Inglés |
Notas : |
Article history: Received January 19, 1999. // Accepted August 8, 1999.
Research was funded by the American Hereford Assoc., Kansas City, MO; Canadian Hereford Assoc., Calgary, Alberta, Canada; and Instituto Nacional de Investigacion Agropecuaria (INIA), Montevideo, Uruguay. The study was part of Hatch Project 851. |
Contenido : |
ABSTRACT.
Records from the Hereford Associations of the United States (USA), Canada, and Uruguay were used to estimate genetic and phenotypic variances and covariances for weaning weight. Estimation was done using a complete animal model, relatively large data sets, and the same methodology for the three countries in order to determine whether genetic parameters for weaning weight were homogeneous across environments. Data were composed of 2,322,722, 487,661, and 102,986 edited weaning weight records for USA, Canada, and Uruguay, respectively. Ten samples were obtained from each country by eliminating data from small herds with fewer than 500 records, selecting herds at random from the entire data set after removing the small herds, and then retaining the direct-sire-connected contemporary groups within each sample. The final sample sizes ranged from 9,832 to 46,377 records. An accelerated EM-REML algorithm was used in estimating the (co)variance components in each sample. The estimates were pooled by calculating the arithmetic mean of the 10 samples from within each country. Direct and maternal (in parentheses) heritability estimates were .24 (.16), .20 (.16), and .23 (.18) for USA, Canada, and Uruguay, respectively. Maternal heritabilities reported here are nearly 50% smaller than the values currently used in national genetic evaluation for the breed, which were estimated using sire-maternal grandsire models. Covariance between direct and maternal was negative in all countries, accounting for 6, 8, and 10% of the total phenotypic variation, and the total dam effect was 32.5, 37.0, and 34.0% in USA, Canada, and Uruguay, respectively. Total heritabilities were similar among the countries, with values of .19, .19, and .17 for the three respective countries. The similarity of genetic and environmental parameters across the three countries suggests that joint genetic evaluation is feasible across environments provided that the genotype x environment interaction is negligible and can be ignored.
?2000 American Society of Animal Science. All rights reserved. MenosABSTRACT.
Records from the Hereford Associations of the United States (USA), Canada, and Uruguay were used to estimate genetic and phenotypic variances and covariances for weaning weight. Estimation was done using a complete animal model, relatively large data sets, and the same methodology for the three countries in order to determine whether genetic parameters for weaning weight were homogeneous across environments. Data were composed of 2,322,722, 487,661, and 102,986 edited weaning weight records for USA, Canada, and Uruguay, respectively. Ten samples were obtained from each country by eliminating data from small herds with fewer than 500 records, selecting herds at random from the entire data set after removing the small herds, and then retaining the direct-sire-connected contemporary groups within each sample. The final sample sizes ranged from 9,832 to 46,377 records. An accelerated EM-REML algorithm was used in estimating the (co)variance components in each sample. The estimates were pooled by calculating the arithmetic mean of the 10 samples from within each country. Direct and maternal (in parentheses) heritability estimates were .24 (.16), .20 (.16), and .23 (.18) for USA, Canada, and Uruguay, respectively. Maternal heritabilities reported here are nearly 50% smaller than the values currently used in national genetic evaluation for the breed, which were estimated using sire-maternal grandsire models. Covariance between direct and maternal was negative in all count... Presentar Todo |
Palabras claves : |
ANIMALS; BEEF CATTLE; BODY WEIGHT; CATTLE; GENETIC VARIABILITY. |
Asunto categoría : |
L01 Ganadería |
URL : |
http://www.ainfo.inia.uy/digital/bitstream/item/12391/1/de-Mattos-D.-2000.-JAS.pdf
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Marc : |
LEADER 03108naa a2200241 a 4500 001 1002960 005 2019-02-04 008 2000 bl uuuu u00u1 u #d 022 $a0021-8812 024 7 $a10.2527/2000.78133x$2DOI 100 1 $aDE MATTOS, D. 245 $aVariance and covariance components for weaning weight for Herefords in three countries.$h[electronic resource] 260 $c2000 500 $aArticle history: Received January 19, 1999. // Accepted August 8, 1999. Research was funded by the American Hereford Assoc., Kansas City, MO; Canadian Hereford Assoc., Calgary, Alberta, Canada; and Instituto Nacional de Investigacion Agropecuaria (INIA), Montevideo, Uruguay. The study was part of Hatch Project 851. 520 $aABSTRACT. Records from the Hereford Associations of the United States (USA), Canada, and Uruguay were used to estimate genetic and phenotypic variances and covariances for weaning weight. Estimation was done using a complete animal model, relatively large data sets, and the same methodology for the three countries in order to determine whether genetic parameters for weaning weight were homogeneous across environments. Data were composed of 2,322,722, 487,661, and 102,986 edited weaning weight records for USA, Canada, and Uruguay, respectively. Ten samples were obtained from each country by eliminating data from small herds with fewer than 500 records, selecting herds at random from the entire data set after removing the small herds, and then retaining the direct-sire-connected contemporary groups within each sample. The final sample sizes ranged from 9,832 to 46,377 records. An accelerated EM-REML algorithm was used in estimating the (co)variance components in each sample. The estimates were pooled by calculating the arithmetic mean of the 10 samples from within each country. Direct and maternal (in parentheses) heritability estimates were .24 (.16), .20 (.16), and .23 (.18) for USA, Canada, and Uruguay, respectively. Maternal heritabilities reported here are nearly 50% smaller than the values currently used in national genetic evaluation for the breed, which were estimated using sire-maternal grandsire models. Covariance between direct and maternal was negative in all countries, accounting for 6, 8, and 10% of the total phenotypic variation, and the total dam effect was 32.5, 37.0, and 34.0% in USA, Canada, and Uruguay, respectively. Total heritabilities were similar among the countries, with values of .19, .19, and .17 for the three respective countries. The similarity of genetic and environmental parameters across the three countries suggests that joint genetic evaluation is feasible across environments provided that the genotype x environment interaction is negligible and can be ignored. ?2000 American Society of Animal Science. All rights reserved. 653 $aANIMALS 653 $aBEEF CATTLE 653 $aBODY WEIGHT 653 $aCATTLE 653 $aGENETIC VARIABILITY 700 1 $aMISZTAL, I. 700 1 $aBERTRAND, J. K. 773 $tJournal of Animal Science, January 2000, volume 78, Issue 1, pages 33-37. OPEN ACCESS.
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INIA Las Brujas (LB) |
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Registro completo
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Biblioteca (s) : |
INIA Salto Grande. |
Fecha actual : |
21/02/2014 |
Actualizado : |
30/10/2014 |
Tipo de producción científica : |
Actividades de Difusión |
Autor : |
GOÑI, C.; OTERO, A. |
Afiliación : |
CARMEN TERESITA GOÑI ALTUNA, INIA (Instituto Nacional de Investigación Agropecuaria), Uruguay; ALVARO RICARDO OTERO CAMA, INIA (Instituto Nacional de Investigación Agropecuaria), Uruguay. |
Título : |
Estudio de los cambios fisiológicos y metabólicos provocados por el anegamiento en mandarinas Satsumas y Clemenules |
Fecha de publicación : |
2013 |
Fuente / Imprenta : |
ln: Goñi, C.; Otero, A. Resultados de Avances de Investigación en Ecofisiología y Nutrición de Cítricos. Salto, Uruguay: INIA, 2013. |
Páginas : |
p. 2-15 |
Serie : |
(INIA Serie Actividades de Difusión; 708) |
Idioma : |
Español |
Thesagro : |
ANEGAMIENTO; CITRUS; FISIOLOGIA VEGETAL; MANDARINA; NECESIDADES DE LAS PLANTAS; NUTRICION DE LAS PLANTAS; RIEGO; SUELO. |
Asunto categoría : |
-- |
URL : |
http://www.ainfo.inia.uy/digital/bitstream/item/2430/1/12940180413095939.pdf
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Marc : |
LEADER 00831naa a2200241 a 4500 001 1015302 005 2014-10-30 008 2013 bl uuuu u00u1 u #d 100 1 $aGOÑI, C. 245 $aEstudio de los cambios fisiológicos y metabólicos provocados por el anegamiento en mandarinas Satsumas y Clemenules$h[electronic resource] 260 $c2013 300 $ap. 2-15 490 $a(INIA Serie Actividades de Difusión; 708) 650 $aANEGAMIENTO 650 $aCITRUS 650 $aFISIOLOGIA VEGETAL 650 $aMANDARINA 650 $aNECESIDADES DE LAS PLANTAS 650 $aNUTRICION DE LAS PLANTAS 650 $aRIEGO 650 $aSUELO 700 1 $aOTERO, A. 773 $tln: Goñi, C.; Otero, A. Resultados de Avances de Investigación en Ecofisiología y Nutrición de Cítricos. Salto, Uruguay: INIA, 2013.
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