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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 : |
18/06/2019 |
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Tipo de producción científica : |
Artículos en Revistas Indexadas Internacionales |
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Autor : |
SÁNCHEZ, J.P.; MISZTAL, I.; AGUILAR, I.; ZUMBACH, B.; REKAYA, R. |
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Afiliación : |
J. P. SÁNCHEZ, Departamento de Producción animal, Universidad de León, Spain; I. MISZTAL, Animal and Dairy Science Department, University of Georgia, United States; IGNACIO AGUILAR GARCIA, INIA (Instituto Nacional de Investigación Agropecuaria), Uruguay; B. ZUMBACH, Norsvin, Norway; R. REKAYA, Animal and Dairy Science Department, University of Georgia, United States. |
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Título : |
Genetic determination of the onset of heat stress on daily milk production in the US Holstein cattle. |
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Fecha de publicación : |
2009 |
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Fuente / Imprenta : |
Journal of Dairy Science, 2009, 92 (8): 4035-4045. OPEN ACCESS. |
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ISSN : |
0022-0302 |
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DOI : |
10.3168/jds.2008-1626 |
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Idioma : |
Inglés |
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Notas : |
Article history: Received August 12, 2008. // Accepted March 18, 2009. |
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Contenido : |
ABSTRACT.
Existence of individual variation in the onset of heat stress for daily milk yield of dairy cows was assessed. Data included 353,376 test-day records of 38,383 first-parity Holsteins from a random sample of US herds. Three hierarchical models were investigated. Model 1 inferred the value of a temperature-humidity index (THI) at which mean yield began to decline as well as the extent of that decline. Model 2 assumed individual variation in yield decline beyond a common THI threshold. Model 3 additionally assumed individual variation for the onset of heat stress. Deviance information criteria indicated the superiority of model 3 over model 2. For model 2, genetic correlation between milk yield in the absence of heat stress and the THI threshold for heat stress was -0.4 (0.11) [marginal posterior mean (marginal posterior standard deviation)]. For model 3, genetic correlations were -0.53 (0.05) between milk yield and THI threshold and -0.62 (0.08) between milk yield and yield decay beyond the THI threshold. Total standard deviation (sum of additive genetic and permanent envi-ronmental standard deviations) for the THI threshold was 3.95 (0.06), and more than half of that variation had an additive genetic origin [56% (5%)]. Because of the high genetic correlation [0.95 (0.03)] between yield decay and THI threshold with model 3, using only one of them as a selection criterion for heat tolerance would modify the other in the desired direction.
© american Dairy Science association, 2009. MenosABSTRACT.
Existence of individual variation in the onset of heat stress for daily milk yield of dairy cows was assessed. Data included 353,376 test-day records of 38,383 first-parity Holsteins from a random sample of US herds. Three hierarchical models were investigated. Model 1 inferred the value of a temperature-humidity index (THI) at which mean yield began to decline as well as the extent of that decline. Model 2 assumed individual variation in yield decline beyond a common THI threshold. Model 3 additionally assumed individual variation for the onset of heat stress. Deviance information criteria indicated the superiority of model 3 over model 2. For model 2, genetic correlation between milk yield in the absence of heat stress and the THI threshold for heat stress was -0.4 (0.11) [marginal posterior mean (marginal posterior standard deviation)]. For model 3, genetic correlations were -0.53 (0.05) between milk yield and THI threshold and -0.62 (0.08) between milk yield and yield decay beyond the THI threshold. Total standard deviation (sum of additive genetic and permanent envi-ronmental standard deviations) for the THI threshold was 3.95 (0.06), and more than half of that variation had an additive genetic origin [56% (5%)]. Because of the high genetic correlation [0.95 (0.03)] between yield decay and THI threshold with model 3, using only one of them as a selection criterion for heat tolerance would modify the other in the desired direction.
© american Dairy Science ass... Presentar Todo |
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Palabras claves : |
GENETIC VARIABILITY; HEAT STRESS; HOLSTEIN; MILK YIELD. |
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Thesagro : |
LECHERÍA; VARIABILIDAD GENETICA. |
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Asunto categoría : |
-- |
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URL : |
http://www.ainfo.inia.uy/digital/bitstream/item/12194/1/1-s2.0-S0022030209707271-main.pdf
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Marc : |
LEADER 02375naa a2200277 a 4500
001 1012828
005 2019-06-18
008 2009 bl uuuu u00u1 u #d
022 $a0022-0302
024 7 $a10.3168/jds.2008-1626$2DOI
100 1 $aSÁNCHEZ, J.P.
245 $aGenetic determination of the onset of heat stress on daily milk production in the US Holstein cattle.$h[electronic resource]
260 $c2009
500 $aArticle history: Received August 12, 2008. // Accepted March 18, 2009.
520 $aABSTRACT. Existence of individual variation in the onset of heat stress for daily milk yield of dairy cows was assessed. Data included 353,376 test-day records of 38,383 first-parity Holsteins from a random sample of US herds. Three hierarchical models were investigated. Model 1 inferred the value of a temperature-humidity index (THI) at which mean yield began to decline as well as the extent of that decline. Model 2 assumed individual variation in yield decline beyond a common THI threshold. Model 3 additionally assumed individual variation for the onset of heat stress. Deviance information criteria indicated the superiority of model 3 over model 2. For model 2, genetic correlation between milk yield in the absence of heat stress and the THI threshold for heat stress was -0.4 (0.11) [marginal posterior mean (marginal posterior standard deviation)]. For model 3, genetic correlations were -0.53 (0.05) between milk yield and THI threshold and -0.62 (0.08) between milk yield and yield decay beyond the THI threshold. Total standard deviation (sum of additive genetic and permanent envi-ronmental standard deviations) for the THI threshold was 3.95 (0.06), and more than half of that variation had an additive genetic origin [56% (5%)]. Because of the high genetic correlation [0.95 (0.03)] between yield decay and THI threshold with model 3, using only one of them as a selection criterion for heat tolerance would modify the other in the desired direction. © american Dairy Science association, 2009.
650 $aLECHERÍA
650 $aVARIABILIDAD GENETICA
653 $aGENETIC VARIABILITY
653 $aHEAT STRESS
653 $aHOLSTEIN
653 $aMILK YIELD
700 1 $aMISZTAL, I.
700 1 $aAGUILAR, I.
700 1 $aZUMBACH, B.
700 1 $aREKAYA, R.
773 $tJournal of Dairy Science, 2009, 92 (8): 4035-4045. OPEN ACCESS.
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