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4. | | AICARDI, J.; PÉREZ, H.; ROGBERG, C.; VILA, F.; LAFFITTE, V. El riesgo y la transferencia de tecnología: algunos enfoques para superarlo. ln: Congreso Nacional de Ingeniería Agronómica, 1, 1980, Anales, Montevideo. Montevideo (UY): Asociación de Ingenieros Agronomos del Uruguay, 1980. p. 224-269Biblioteca(s): INIA La Estanzuela; INIA Treinta y Tres. |
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5. | | HUERTAS, S.; BOBADILLA, P.; BUENO, H.; CÉSAR, D.; VILA, F.; PIAGGIO, J.; GIL, A.; CALLERO, J.L.; AKKERMANS VAN DER LAAR, E. Evaluación de la sustentabilidad de los sistemas productivos silvopastoriles y sistemas forestales existentes en el país y su relación con la producción de bovinos de carne. Montevideo (UY): INIA, 2020. 63 p. (Serie FPTA-INIA; 87) Proyecto FPTA 311: "Evaluación de la sustentabilidad de los sistemas productivos silvopastoriles y sistemas forestales existentes en el país y su relación con la producción de bovinos de carne." Período de ejecución: Junio 2014 -...Biblioteca(s): INIA Las Brujas. |
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Registro completo
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Biblioteca (s) : |
INIA La Estanzuela; INIA Las Brujas. |
Fecha actual : |
21/02/2014 |
Actualizado : |
18/06/2019 |
Tipo de producción científica : |
Artículos en Revistas Indexadas Internacionales |
Circulación / Nivel : |
A - 1 |
Autor : |
PSZCZOLA, M.; AGUILAR, I.; MISZTAL, I. |
Afiliación : |
M. PSZCZOLA, Animal and Dairy Science Department, University of Georgia, United States; Animal Breeding and Genetics Group, Wageningen Institute of Animal Sciences, Wageningen University, Netherlands; IGNACIO AGUILAR GARCIA, INIA (Instituto Nacional de Investigación Agropecuaria), Uruguay; I. MISZTAL, Animal and Dairy Science Department, University of Georgia, United States. |
Título : |
Short communication: Trends for monthly changes in days open in Holsteins. |
Fecha de publicación : |
2009 |
Fuente / Imprenta : |
Journal of Dairy Science, 2009, 92 (9): 4689-4696. OPEN ACCESS. |
ISSN : |
0022-0302 |
DOI : |
10.3168/jds.2008-1985 |
Idioma : |
Inglés |
Notas : |
Article history: Received December 17, 2008. // Accepted May 5, 2009. |
Contenido : |
ABSTRACT.
A reaction norm approach was used to estimate trends for days open (DO) with a model that indirectly accounted for heat stress. Data included 3.4 million first-parity records of DO of US Holsteins. A fixed effect model included herd-year, month of calving within region (MOC), age class, and regression on 305-d milk yield. An index calculated from the standardized solutions to MOC derived from the fixed effect model was treated as a proxy for an index on heat stress (SI). The lowest index for any region was set to zero. The highest index was 1.00 for the Southeast, 0.56 for the Northeast, 0.54 for the Midwest, 0.33 for the Northwest, and 0.42 for the Southwest. In all regions except the Northwest, the highest DO and the corresponding highest indices were in March-April. Compared with the fixed model, the reaction norm model also included the effect of an animal and a random regression on the SI; the 2 animal solutions are subsequently referred to as an intercept and a slope. Genetic trends were calculated for cows and sires separately. For cows, the trend for the intercept was -0.1 d/yr, whereas the trend for the slope was 1 d/yr. For sires, the same trends were -0.3 and 1.5, respectively. Official proofs were used to characterize the 100 top and 100 bottom bulls with at least 50 daughters for the intercept and the slope. Compared with the top bulls, the bottom bulls for the intercept gave 56 kg more milk and their type performance index was higher by 212 points. For the slope, the same numbers were -435 kg and -242 points, respectively. Trends for seasonal changes of days open are unfavorable.
© American Dairy Science Association, 2009. MenosABSTRACT.
A reaction norm approach was used to estimate trends for days open (DO) with a model that indirectly accounted for heat stress. Data included 3.4 million first-parity records of DO of US Holsteins. A fixed effect model included herd-year, month of calving within region (MOC), age class, and regression on 305-d milk yield. An index calculated from the standardized solutions to MOC derived from the fixed effect model was treated as a proxy for an index on heat stress (SI). The lowest index for any region was set to zero. The highest index was 1.00 for the Southeast, 0.56 for the Northeast, 0.54 for the Midwest, 0.33 for the Northwest, and 0.42 for the Southwest. In all regions except the Northwest, the highest DO and the corresponding highest indices were in March-April. Compared with the fixed model, the reaction norm model also included the effect of an animal and a random regression on the SI; the 2 animal solutions are subsequently referred to as an intercept and a slope. Genetic trends were calculated for cows and sires separately. For cows, the trend for the intercept was -0.1 d/yr, whereas the trend for the slope was 1 d/yr. For sires, the same trends were -0.3 and 1.5, respectively. Official proofs were used to characterize the 100 top and 100 bottom bulls with at least 50 daughters for the intercept and the slope. Compared with the top bulls, the bottom bulls for the intercept gave 56 kg more milk and their type performance index was higher by 212 points. Fo... Presentar Todo |
Palabras claves : |
DAIRY CATTLE; DAYS OPEN; DÍAS ABIERTOS; ESTRÉS TÉRMICO; FERTILIDAD; FERTILITY; HEAT STRESS; REPRODUCCIÓN ANIMAL; VACAS LECHERAS; VACAS VACÍAS. |
Thesagro : |
GANADO LECHERO. |
Asunto categoría : |
-- L53 Fisiología Animal - Reproducción |
URL : |
http://www.ainfo.inia.uy/digital/bitstream/item/12195/1/Pszczola-M.-2009.-Jr.Dairy-Science.pdf
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Marc : |
LEADER 02577naa a2200313 a 4500 001 1012835 005 2019-06-18 008 2009 bl uuuu u00u1 u #d 022 $a0022-0302 024 7 $a10.3168/jds.2008-1985$2DOI 100 1 $aPSZCZOLA, M. 245 $aShort communication$bTrends for monthly changes in days open in Holsteins. 260 $c2009 500 $aArticle history: Received December 17, 2008. // Accepted May 5, 2009. 520 $aABSTRACT. A reaction norm approach was used to estimate trends for days open (DO) with a model that indirectly accounted for heat stress. Data included 3.4 million first-parity records of DO of US Holsteins. A fixed effect model included herd-year, month of calving within region (MOC), age class, and regression on 305-d milk yield. An index calculated from the standardized solutions to MOC derived from the fixed effect model was treated as a proxy for an index on heat stress (SI). The lowest index for any region was set to zero. The highest index was 1.00 for the Southeast, 0.56 for the Northeast, 0.54 for the Midwest, 0.33 for the Northwest, and 0.42 for the Southwest. In all regions except the Northwest, the highest DO and the corresponding highest indices were in March-April. Compared with the fixed model, the reaction norm model also included the effect of an animal and a random regression on the SI; the 2 animal solutions are subsequently referred to as an intercept and a slope. Genetic trends were calculated for cows and sires separately. For cows, the trend for the intercept was -0.1 d/yr, whereas the trend for the slope was 1 d/yr. For sires, the same trends were -0.3 and 1.5, respectively. Official proofs were used to characterize the 100 top and 100 bottom bulls with at least 50 daughters for the intercept and the slope. Compared with the top bulls, the bottom bulls for the intercept gave 56 kg more milk and their type performance index was higher by 212 points. For the slope, the same numbers were -435 kg and -242 points, respectively. Trends for seasonal changes of days open are unfavorable. © American Dairy Science Association, 2009. 650 $aGANADO LECHERO 653 $aDAIRY CATTLE 653 $aDAYS OPEN 653 $aDÍAS ABIERTOS 653 $aESTRÉS TÉRMICO 653 $aFERTILIDAD 653 $aFERTILITY 653 $aHEAT STRESS 653 $aREPRODUCCIÓN ANIMAL 653 $aVACAS LECHERAS 653 $aVACAS VACÍAS 700 1 $aAGUILAR, I. 700 1 $aMISZTAL, I. 773 $tJournal of Dairy Science, 2009, 92 (9): 4689-4696. OPEN ACCESS.
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