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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 : |
18/12/2018 |
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Tipo de producción científica : |
Artículos en Revistas Indexadas Internacionales |
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Autor : |
AGUILAR, I.; MISZTAL, I. |
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Afiliación : |
IGNACIO AGUILAR GARCIA, INIA (Instituto Nacional de Investigación Agropecuaria), Uruguay; Animal and Dairy Science Department, University of Georgia, United States.; I. MISZTAL, Animal and Dairy Science Department, University of Georgia, United States. |
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Título : |
Technical Note: Recursive Algorithm for Inbreeding Coefficients Assuming Nonzero Inbreeding of Unknown Parents. |
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Fecha de publicación : |
2008 |
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Fuente / Imprenta : |
Journal of Dairy Science, 2008, 91 (4): 1669-1672. |
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ISSN : |
0022-0302 |
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DOI : |
10.3168/jds.2007-0575 |
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Idioma : |
Inglés |
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Notas : |
Article history: Received August 3, 2007. // Accepted December 17, 2007. |
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Contenido : |
ABSTRACT.
A recursive algorithm to calculate inbreeding coefficients was modified to account for nonzero inbreeding of unknown parents. The modification was done by changing one part of a recursive formula in which the inbreeding of an animal with at least one unknown parent is not zero and replacing it by the mean inbreeding of all animals born the same year. The algorithm is iterative. Testing involved 17 million US Holsteins. Convergence was reached in 6 rounds. The computing time per round was 4 min, twice as fast as the VanRaden algorithm based on the tabular method. The recursive algorithm is very simple; however, it requires that the recursion takes into account the order of animals. After a simple modification, the algorithm provides a very good approximation of inbreeding when the pedigree is unordered.
© American Dairy Science Association, 2008. |
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Palabras claves : |
INBREEDING COEFFICIENT; RECURSIVE ALGORITHM; UNKNOWN PARENT. |
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Asunto categoría : |
-- |
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URL : |
http://www.ainfo.inia.uy/digital/bitstream/item/12201/1/Technical-note-recursive-algorithm-for-i.pdf
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Marc : |
LEADER 01544naa a2200205 a 4500
001 1012839
005 2018-12-18
008 2008 bl uuuu u00u1 u #d
022 $a0022-0302
024 7 $a10.3168/jds.2007-0575$2DOI
100 1 $aAGUILAR, I.
245 $aTechnical Note$bRecursive Algorithm for Inbreeding Coefficients Assuming Nonzero Inbreeding of Unknown Parents.
260 $c2008
500 $aArticle history: Received August 3, 2007. // Accepted December 17, 2007.
520 $aABSTRACT. A recursive algorithm to calculate inbreeding coefficients was modified to account for nonzero inbreeding of unknown parents. The modification was done by changing one part of a recursive formula in which the inbreeding of an animal with at least one unknown parent is not zero and replacing it by the mean inbreeding of all animals born the same year. The algorithm is iterative. Testing involved 17 million US Holsteins. Convergence was reached in 6 rounds. The computing time per round was 4 min, twice as fast as the VanRaden algorithm based on the tabular method. The recursive algorithm is very simple; however, it requires that the recursion takes into account the order of animals. After a simple modification, the algorithm provides a very good approximation of inbreeding when the pedigree is unordered. © American Dairy Science Association, 2008.
653 $aINBREEDING COEFFICIENT
653 $aRECURSIVE ALGORITHM
653 $aUNKNOWN PARENT
700 1 $aMISZTAL, I.
773 $tJournal of Dairy Science, 2008, 91 (4): 1669-1672.
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Registro original : |
INIA Las Brujas (LB) |
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 | Acceso al texto completo restringido a Biblioteca INIA La Estanzuela. Por información adicional contacte bib_le@inia.org.uy. |
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Registro completo
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Biblioteca (s) : |
INIA La Estanzuela; INIA Tacuarembó. |
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Fecha actual : |
11/05/2020 |
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Actualizado : |
27/01/2021 |
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Tipo de producción científica : |
Artículos en Revistas Indexadas Internacionales |
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Circulación / Nivel : |
Internacional - -- |
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Autor : |
LÓPEZ-GONZÁLEZ, F.A.; RODRIGO ALLENDE, R.; SOARES DE LIMA, J.M.; CANOZZI, M.E.A.; GIL, A.; BARCELLOS, J.O.J. |
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Afiliación : |
FREDY ANDREY LÓPEZ-GONZÁLEZ, Department of Animal Science, Federal University of Rio Grande do Sul, 7.712 Bento Gonçalves Ave., Porto Alegre, Rio Grande do Sul 91540-000, Brazil.; RODRIGO ALLENDE, Department of Animal Science, Faculty of Veterinary Sciences, University of Concepción, Chillán, Chile.; JUAN MANUEL SOARES DE LIMA LAPETINA, INIA (Instituto Nacional de Investigación Agropecuaria), Uruguay; MARÍA EUGENIA ANDRIGHETTO CANOZZI, INIA (Instituto Nacional de Investigación Agropecuaria), Uruguay; AMIR GIL, Sessim Department of Animal Science, Federal University of Rio Grande do Sul, 7.712 Bento Gonçalves Ave., Porto Alegre, Rio Grande do Sul 91540-000, Brazil.; JÚLIO OTÁVIO JARDIM BARCELLOS, Department of Animal Science, Federal University of Rio Grande do Sul, 7.712 Bento Gonçalves Ave., Porto Alegre, Rio Grande do Sul 91540-000, Brazil. |
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Título : |
Intensification of cow-calf production: How does the system respond biologically to energy inputs in a long-term horizon?. |
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Fecha de publicación : |
2020 |
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Fuente / Imprenta : |
Livestock Science, Volume 237, July 2020, 104058. Doi: https://doi.org/10.1016/j.livsci.2020.104058. |
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DOI : |
10.1016/j.livsci.2020.104058 |
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Idioma : |
Inglés |
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Notas : |
Article history: Received 21 August 2019// Received in revised form 22 March 2020// Accepted 9 April 2020 //Available online 26 April 2020- Corresponding author. E-mail address: julio.barcellos@ufrgs.br (J.O.J. Barcellos).This study was ?nanced in part by the Coordenação de Aperfeiçoamento de Pessoal de Nível Superior - Brasil (CAPES) Finance Code 001. |
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Contenido : |
Abstract:
In southern Brazil, beef cattle production systems generally rely on grazing on natural pastures. However, their forage production, and consequently metabolizable energy (ME) production, is seasonal and influenced by climatic events. Thus, there is a scientific and commercial interest in evaluating and understanding the biological impacts of intensification using pasture irrigation and the effects of El Niño-Southern Oscillation (ENSO) phenomena on the long term on the productivity of cow-calf systems. Therefore, our objective was to develop a simulation model to evaluate the effects of intensification levels, using cultivated pastures and irrigation, on the productivity and on the efficiency metabolizable energy utilization of beef cow-calf systems in a 10-year horizon. This period allows capturing the effects of several production cycles as influenced by ENSO events. The model includes three submodels: herd structure, herd ME requirements, and forage ME production. The results of the present study demonstrate that the proposed model is able to evaluate the influence of intensification of grazing systems on metabolizable energy production, carrying capacity, productivity and biological efficiency of beef cow-calf systems over a long-term horizon. Productivity was increased in 15.9% when 20% of the grazing area was intensified and irrigated compared with the modeled non-intensified system, independently of climatic events. The main productive response was the increase in the number of dams in the herd, especially as a result of the use of irrigation. This study proposes different alternatives for increasing the productivity of beef cow-calf systems in southern Brazil. MenosAbstract:
In southern Brazil, beef cattle production systems generally rely on grazing on natural pastures. However, their forage production, and consequently metabolizable energy (ME) production, is seasonal and influenced by climatic events. Thus, there is a scientific and commercial interest in evaluating and understanding the biological impacts of intensification using pasture irrigation and the effects of El Niño-Southern Oscillation (ENSO) phenomena on the long term on the productivity of cow-calf systems. Therefore, our objective was to develop a simulation model to evaluate the effects of intensification levels, using cultivated pastures and irrigation, on the productivity and on the efficiency metabolizable energy utilization of beef cow-calf systems in a 10-year horizon. This period allows capturing the effects of several production cycles as influenced by ENSO events. The model includes three submodels: herd structure, herd ME requirements, and forage ME production. The results of the present study demonstrate that the proposed model is able to evaluate the influence of intensification of grazing systems on metabolizable energy production, carrying capacity, productivity and biological efficiency of beef cow-calf systems over a long-term horizon. Productivity was increased in 15.9% when 20% of the grazing area was intensified and irrigated compared with the modeled non-intensified system, independently of climatic events. The main productive response was the incre... Presentar Todo |
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Palabras claves : |
BIOLOGICAL EFFICENCY; EL NIÑO-SOUTHERN OSCILLATION(ENSO); HERD STRUCTURE; INTENSIFICACIÓN DE LA PRODUCCIÓN; IRRIGATION MODELING. |
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Asunto categoría : |
L01 Ganadería |
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Marc : |
LEADER 02980naa a2200265 a 4500
001 1061050
005 2021-01-27
008 2020 bl uuuu u00u1 u #d
024 7 $a10.1016/j.livsci.2020.104058$2DOI
100 1 $aLÓPEZ-GONZÁLEZ, F.A.
245 $aIntensification of cow-calf production$bHow does the system respond biologically to energy inputs in a long-term horizon?.$h[electronic resource]
260 $c2020
500 $aArticle history: Received 21 August 2019// Received in revised form 22 March 2020// Accepted 9 April 2020 //Available online 26 April 2020- Corresponding author. E-mail address: julio.barcellos@ufrgs.br (J.O.J. Barcellos).This study was ?nanced in part by the Coordenação de Aperfeiçoamento de Pessoal de Nível Superior - Brasil (CAPES) Finance Code 001.
520 $aAbstract: In southern Brazil, beef cattle production systems generally rely on grazing on natural pastures. However, their forage production, and consequently metabolizable energy (ME) production, is seasonal and influenced by climatic events. Thus, there is a scientific and commercial interest in evaluating and understanding the biological impacts of intensification using pasture irrigation and the effects of El Niño-Southern Oscillation (ENSO) phenomena on the long term on the productivity of cow-calf systems. Therefore, our objective was to develop a simulation model to evaluate the effects of intensification levels, using cultivated pastures and irrigation, on the productivity and on the efficiency metabolizable energy utilization of beef cow-calf systems in a 10-year horizon. This period allows capturing the effects of several production cycles as influenced by ENSO events. The model includes three submodels: herd structure, herd ME requirements, and forage ME production. The results of the present study demonstrate that the proposed model is able to evaluate the influence of intensification of grazing systems on metabolizable energy production, carrying capacity, productivity and biological efficiency of beef cow-calf systems over a long-term horizon. Productivity was increased in 15.9% when 20% of the grazing area was intensified and irrigated compared with the modeled non-intensified system, independently of climatic events. The main productive response was the increase in the number of dams in the herd, especially as a result of the use of irrigation. This study proposes different alternatives for increasing the productivity of beef cow-calf systems in southern Brazil.
653 $aBIOLOGICAL EFFICENCY
653 $aEL NIÑO-SOUTHERN OSCILLATION(ENSO)
653 $aHERD STRUCTURE
653 $aINTENSIFICACIÓN DE LA PRODUCCIÓN
653 $aIRRIGATION MODELING
700 1 $aRODRIGO ALLENDE, R.
700 1 $aSOARES DE LIMA, J.M.
700 1 $aCANOZZI, M.E.A.
700 1 $aGIL, A.
700 1 $aBARCELLOS, J.O.J.
773 $tLivestock Science, Volume 237, July 2020, 104058. Doi: https://doi.org/10.1016/j.livsci.2020.104058.
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