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Biblioteca (s) : |
INIA Las Brujas. |
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Fecha actual : |
21/02/2014 |
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Actualizado : |
03/10/2019 |
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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 : |
RAVAGNOLO, O.; MISZTAL, I. |
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Afiliación : |
OLGA RAVAGNOLO GUMILA, INIA (Instituto Nacional de Investigación Agropecuaria), Uruguay; I. MISZTAL, University of Georgia, United States. |
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Título : |
Effect of heat stress on nonreturn rate in holstein cows: Genetic analyses. |
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Fecha de publicación : |
2002 |
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Fuente / Imprenta : |
Journal of Dairy Science, 2002, 85 (11): 3092-3100. |
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ISSN : |
0022-0302 |
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DOI : |
10.3168/jds.S0022-0302(02)74396-8 |
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Idioma : |
Inglés |
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Notas : |
Article history: Received August 13, 2001. / Accepted October 16, 2002. |
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Contenido : |
ABSTRACT.
The genetic component in heat tolerance for nonreturn rate in Holsteins was estimated using an animal linear model augmented by a random regression on a temperature-humidity index (THI). Data consisted of 18,059 nonreturn rates at 45, 60, and 90 d after insemination and 81,674 first-parity test-day milk yields from 78 herds in Florida. The THI on the day of insemination or test day was added to each record. Only first-insemination records were used. The model for nonreturn rate included the effects of herd-year-season, age, days in milk, milk yield, THI as a covariable, regular additive effect, and random regression on THI for heat-tolerance additive effect. With a single-trait model, heritability estimates for NR45, NR60, and NR90 at THI = 70 for first-lactation cows were 0.006, 0.014, and 0.053, respectively. Genetic correlation between regular NR90 and heat tolerance was -0.95. A bivariate analysis for NR90 and test-day milk production yielded a correlation between regular merit and heat tolerance for NR90 of -0.35, substantially lower than by the univariate model, indicating a bias in the univariate estimates caused by ignored selection. The regular genetic correlation between NR90 and milk yield was -0.41. Genetic correlation between heat tolerance for NR90 and heat tolerance for milk yield was -0.04, indicating the need to separate selection.
© Copyright 2017 Elsevier B.V., All rights reserved. |
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Palabras claves : |
Dairy cattle; Heat stress; Nonreturn rate; Temperature-humidity index. |
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Asunto categoría : |
-- |
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URL : |
http://www.ainfo.inia.uy/digital/bitstream/item/13409/1/Jr.Dairy-Science.-2002.-1-s2.0-S0022030202743968-main.pdf
https://www.journalofdairyscience.org/article/S0022-0302(02)74396-8/pdf
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Marc : |
LEADER 02135naa a2200217 a 4500
001 1012855
005 2019-10-03
008 2002 bl uuuu u00u1 u #d
022 $a0022-0302
024 7 $a10.3168/jds.S0022-0302(02)74396-8$2DOI
100 1 $aRAVAGNOLO, O.
245 $aEffect of heat stress on nonreturn rate in holstein cows$bGenetic analyses.$h[electronic resource]
260 $c2002
500 $aArticle history: Received August 13, 2001. / Accepted October 16, 2002.
520 $aABSTRACT. The genetic component in heat tolerance for nonreturn rate in Holsteins was estimated using an animal linear model augmented by a random regression on a temperature-humidity index (THI). Data consisted of 18,059 nonreturn rates at 45, 60, and 90 d after insemination and 81,674 first-parity test-day milk yields from 78 herds in Florida. The THI on the day of insemination or test day was added to each record. Only first-insemination records were used. The model for nonreturn rate included the effects of herd-year-season, age, days in milk, milk yield, THI as a covariable, regular additive effect, and random regression on THI for heat-tolerance additive effect. With a single-trait model, heritability estimates for NR45, NR60, and NR90 at THI = 70 for first-lactation cows were 0.006, 0.014, and 0.053, respectively. Genetic correlation between regular NR90 and heat tolerance was -0.95. A bivariate analysis for NR90 and test-day milk production yielded a correlation between regular merit and heat tolerance for NR90 of -0.35, substantially lower than by the univariate model, indicating a bias in the univariate estimates caused by ignored selection. The regular genetic correlation between NR90 and milk yield was -0.41. Genetic correlation between heat tolerance for NR90 and heat tolerance for milk yield was -0.04, indicating the need to separate selection. © Copyright 2017 Elsevier B.V., All rights reserved.
653 $aDairy cattle
653 $aHeat stress
653 $aNonreturn rate
653 $aTemperature-humidity index
700 1 $aMISZTAL, I.
773 $tJournal of Dairy Science, 2002, 85 (11): 3092-3100.
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