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| 24. |  | DE MATTOS, D.; MISZTAL, I.; BERTRAND, J. K. Variance and covariance components for weaning weight for Herefords in three countries. Journal of Animal Science, January 2000, volume 78, Issue 1, pages 33-37. OPEN ACCESS. 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...| Biblioteca(s): INIA Las Brujas. |
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| 29. | | MONTOSSI, F.; DE MATTOS, D.; MEDEROS, A.; DE BARBIERI, I.; GRATTAROLA, M.; PÉREZ JONES, J. Avances del Proyecto Merino Fino del Uruguay, obtenidos en el núcleo fundacional de la Unidad Experimental Glencoe de INIA Tacuarembó El País Agropecuario, 2001, v. 6, no. 73, p. 25-28.| Biblioteca(s): INIA Tacuarembó. |
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| 33. | | REALINI, C. E.; DUCKETT, S. K.; BRITO, G.; DALLA RIZZA, M.; DE MATTOS, D. Effect of pasture vs. concentrate feeding with or without antioxidants on carcass characteristics, fatty acid composition, and quality of Uruguayan beef. Meat Science, March 2004, volume 66, Issue 3, pages 567-577. Article history: Received 17 March 2003 // Received in revised form 13 June 2003 // Accepted 13 June 2003.
This research was funded by the Uruguayan National Institute of Agricultural Research (INIA), Inter-American Development Bank (IDB)...| Biblioteca(s): INIA Las Brujas. |
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| Registros recuperados : 98 | |
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Registro completo
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Biblioteca (s) : |
INIA Las Brujas. |
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Fecha actual : |
21/02/2014 |
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Actualizado : |
04/02/2019 |
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Tipo de producción científica : |
Artículos en Revistas Indexadas Internacionales |
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Circulación / Nivel : |
A - 1 |
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Autor : |
DE MATTOS, D.; MISZTAL, I.; BERTRAND, J. K. |
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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. |
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Título : |
Variance and covariance components for weaning weight for Herefords in three countries. |
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Fecha de publicación : |
2000 |
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Fuente / Imprenta : |
Journal of Animal Science, January 2000, volume 78, Issue 1, pages 33-37. OPEN ACCESS. |
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ISSN : |
0021-8812 |
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DOI : |
10.2527/2000.78133x |
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Idioma : |
Inglés |
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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. |
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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 |
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Palabras claves : |
ANIMALS; BEEF CATTLE; BODY WEIGHT; CATTLE; GENETIC VARIABILITY. |
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Asunto categoría : |
L01 Ganadería |
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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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