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Registro completo
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Biblioteca (s) : |
INIA Las Brujas. |
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Fecha : |
21/02/2014 |
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Actualizado : |
04/02/2020 |
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Tipo de producción científica : |
Artículos en Revistas Indexadas Internacionales |
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Autor : |
RAVAGNOLO, O.; MISZTAL, I. |
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Afiliación : |
OLGA RAVAGNOLO GUMILA, INIA (Instituto Nacional de Investigación Agropecuaria), Uruguay; I. MISZTAL, Dept. of Animal and Dairy Science, University of Georgia, Athens, GA, United States. |
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Título : |
Studies on genetics of heat tolerance in dairy cattle with reduced weather information via cluster analysis. |
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Fecha de publicación : |
2002 |
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Fuente / Imprenta : |
Journal of Dairy Science, June 2002, Volume 85, Issue 6, Pages 1586-1589. OPEN ACCESS. DOI: https://doi.org/10.3168/jds.S0022-0302(02)74228-8 |
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ISSN : |
0022-0302 |
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DOI : |
10.3168/jds.S0022-0302(02)74228-8 |
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Idioma : |
Inglés |
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Notas : |
Article history: |
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Contenido : |
ABSTRACT.
The objective of this study was to explore the possibility of reducing the number of weather stations for studies on genetics of heat tolerance in dairy cattle. The similarity of information from 21 Georgia weather stations was analyzed by cluster analysis. Two major clusters have been found, separating Georgia along the NE and SW line. One weather station was selected for each of the clusters based on the minimal distance to all the remaining weather stations and on completeness of the weather information. The production dataset consisted of 114,751 first-parity test-day records for milk on 14,297 Holsteins from 120 herds in Georgia. Analyses using a model for daily milk yield with temperature-humidity index classes and several other fixed effects showed no increase in error sum of squares when using only two weather stations. The threshold of heat stress was different for each of the two regions but the rate of decline after the threshold was similar. After accounting for different thresholds, the genetic component of heat tolerance for milk was higher with the two-station model. Genetic studies on or evaluation for heat tolerance based on information from a few carefully selected weather stations can be as accurate as those based on information from numerous such stations. |
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Palabras claves : |
Dairy; Heat stress; Random regressions. |
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Asunto categoría : |
L01 Ganadería |
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URL : |
https://www.journalofdairyscience.org/article/S0022-0302(02)74228-8/pdf
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Marc : |
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001 1012856
005 2020-02-04
008 2002 bl uuuu u00u1 u #d
022 $a0022-0302
024 7 $a10.3168/jds.S0022-0302(02)74228-8$2DOI
100 1 $aRAVAGNOLO, O.
245 $aStudies on genetics of heat tolerance in dairy cattle with reduced weather information via cluster analysis.$h[electronic resource]
260 $c2002
500 $aArticle history:
520 $aABSTRACT. The objective of this study was to explore the possibility of reducing the number of weather stations for studies on genetics of heat tolerance in dairy cattle. The similarity of information from 21 Georgia weather stations was analyzed by cluster analysis. Two major clusters have been found, separating Georgia along the NE and SW line. One weather station was selected for each of the clusters based on the minimal distance to all the remaining weather stations and on completeness of the weather information. The production dataset consisted of 114,751 first-parity test-day records for milk on 14,297 Holsteins from 120 herds in Georgia. Analyses using a model for daily milk yield with temperature-humidity index classes and several other fixed effects showed no increase in error sum of squares when using only two weather stations. The threshold of heat stress was different for each of the two regions but the rate of decline after the threshold was similar. After accounting for different thresholds, the genetic component of heat tolerance for milk was higher with the two-station model. Genetic studies on or evaluation for heat tolerance based on information from a few carefully selected weather stations can be as accurate as those based on information from numerous such stations.
653 $aDairy
653 $aHeat stress
653 $aRandom regressions
700 1 $aMISZTAL, I.
773 $tJournal of Dairy Science, June 2002, Volume 85, Issue 6, Pages 1586-1589. OPEN ACCESS. DOI: https://doi.org/10.3168/jds.S0022-0302(02)74228-8
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INIA Las Brujas (LB) |
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| Registros recuperados : 165 | |
| 3. |  | RAVAGNOLO, O. Mejoramiento genético de bovinos en Uruguay. In: PRIMER CONGRESO INTERNACIONAL, 1er. "Desafíos y oportunidades de la ganadería, para el aumento de la productividad nacional. INTA - Nicaragua, 28 y 29 Junio 2016. [Presentación Oral] 18 p.| Tipo: Presentaciones Orales |
| Biblioteca(s): INIA Las Brujas. |
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| 16. | | PRAVIA, M.I.; RAVAGNOLO, O.; URIOSTE, J. Development of selection indexes for a beef cattle production system from available EPDs. Volume Genetic Improvement Programs: Breeding objectives, economics of selection schemes, and advances in selection theory (Posters), p. 406. In: Proceedings of the World Congress on Genetics Applied to Livestock Production, 10., Vancouver, BC, Canada, August 17-22, 2014. p.406.| Tipo: Trabajos en Congresos/Conferencias |
| Biblioteca(s): INIA Las Brujas. |
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| Registros recuperados : 165 | |
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