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Registro completo
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Biblioteca (s) : |
INIA La Estanzuela; 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 : |
PSZCZOLA, M.; AGUILAR, I.; MISZTAL, I. |
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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. |
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Título : |
Short communication: Trends for monthly changes in days open in Holsteins. |
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Fecha de publicación : |
2009 |
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Fuente / Imprenta : |
Journal of Dairy Science, 2009, 92 (9): 4689-4696. OPEN ACCESS. |
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ISSN : |
0022-0302 |
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DOI : |
10.3168/jds.2008-1985 |
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Idioma : |
Inglés |
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Notas : |
Article history: Received December 17, 2008. // Accepted May 5, 2009. |
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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 |
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Palabras claves : |
DAIRY CATTLE; DAYS OPEN; DÍAS ABIERTOS; ESTRÉS TÉRMICO; FERTILIDAD; FERTILITY; HEAT STRESS; REPRODUCCIÓN ANIMAL; VACAS LECHERAS; VACAS VACÍAS. |
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Thesagro : |
GANADO LECHERO. |
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Asunto categoría : |
--
L53 Fisiología Animal - Reproducción |
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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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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. |
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Fecha actual : |
28/09/2018 |
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Actualizado : |
09/10/2019 |
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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 : |
LOPES, R.B.; CANOZZI, M.E.A.; CANELLAS, L.C; GONZALEZ, F.A.L.; CORRÊA, R.F.; PEREIRA, P.R.R.X; BARCELLOS, J.O.J. |
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Afiliación : |
RÚBIA BRANCO LOPES, Department of Animal Science, Federal University of Rio Grande do Sul, Porto Alegre, Rio Grande do Sul,Brazil.; MARIA EUGÊNIA ANDRIGHETTO CANOZZI, INIA (Instituto Nacional de Investigación Agropecuaria), Uruguay.; LEONARDO CANALLI CANELLAS, Department of Animal Science, Federal University of Rio Grande do Sul, Porto Alegre, Rio Grande do Sul, Brazil.; FREDY ANDREY LOPEZ GONZALEZ, Department of Animal Science, Federal University of Rio Grande do Sul, Porto Alegre, Rio Grande do Sul,Brazil.; RICARDO FARIA CORRÊA, Department of Production and Transportation Engineering, Federal University of Rio Grande do Sul, Porto Alegre, Brazil.; PAULO RODRIGO RAMOS XAVIER PEREIRA, Department of Agronomy, Federal University of Piauí, Bom Jesus, Brazil.; JÚLIO OTÁVIO JARDIM BARCELLOS, Department of Animal Science, Federal University of Rio Grande do Sul, Porto Alegre, Rio Grande do Sul,Brazil. |
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Título : |
Bioeconomic simulation of compensatory growth in beef cattle production systems. |
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Fecha de publicación : |
2018 |
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Fuente / Imprenta : |
Livestock Science, October 2018, v.216,p.165-173. |
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DOI : |
10.1016/j.livsci.2018.08.011 |
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Idioma : |
Inglés |
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Notas : |
Article history: Received 20 December 2017//Revised 23 August 2018// Accepted 23 August 2018 // Available online 24 August 2018. |
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Contenido : |
Abstract: The manipulation of growth can be used as a strategy to reduce feeding costs. The objective of this study was to analyze, by deterministic and stochastic simulation, compensatory growth effects on the bioeconomic results of growing-finishing beef cattle systems. Four beef cattle systems were simulated with different feed restriction periods (no restriction, CONT; 90 days of restriction, COMP90; 120 days of restriction, COMP120; and 150 days of restriction, COMP150). Risk analysis was performed using the Monte Carlo method. Animals in feed restriction systems demonstrated partial compensation and required longer periods to achieve slaughter weight than CONT steers (16, 23 and 27 more days for COMP90, COMP120 and COMP150, respectively). The CONT system was the most productive (466 kg/ha/year), followed by COMP90 (443 kg/ha/year), COMP120 (432 kg/ha/year), and COMP150 (383 kg/ha/year). The most profitable system was the COMP90 system (US$ 161/ha) followed by the CONT (US$ 144/ha). The lower net margin was observed in the COMP120 (US$ 107/ha) and COMP150 (US$ 90/ha) systems. The risk analysis showed that COMP90 presented the highest financial stability. For all simulated systems, prices of finished steers, feeder calves, and corn were the variables with the greatest effects on net margin. The use of compensatory growth can be a tool to reduce feeding costs in beef cattle systems; however, the feed restriction must not be longer than three months. |
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Palabras claves : |
COMPENSATION; COMPENSATORY GAIN; COMPENSATORY INDEX; CRECIMIENTO COMPENSATORIO; SISTEMAS DE PRODUCCIÓN DE GANADO VACUNO; STOCHASTIC SIMULATION. |
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Thesagro : |
BOVINO DE CARNE. |
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Asunto categoría : |
L01 Ganadería |
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Marc : |
LEADER 02504naa a2200301 a 4500
001 1059090
005 2019-10-09
008 2018 bl uuuu u00u1 u #d
024 7 $a10.1016/j.livsci.2018.08.011$2DOI
100 1 $aLOPES, R.B.
245 $aBioeconomic simulation of compensatory growth in beef cattle production systems.$h[electronic resource]
260 $c2018
500 $aArticle history: Received 20 December 2017//Revised 23 August 2018// Accepted 23 August 2018 // Available online 24 August 2018.
520 $aAbstract: The manipulation of growth can be used as a strategy to reduce feeding costs. The objective of this study was to analyze, by deterministic and stochastic simulation, compensatory growth effects on the bioeconomic results of growing-finishing beef cattle systems. Four beef cattle systems were simulated with different feed restriction periods (no restriction, CONT; 90 days of restriction, COMP90; 120 days of restriction, COMP120; and 150 days of restriction, COMP150). Risk analysis was performed using the Monte Carlo method. Animals in feed restriction systems demonstrated partial compensation and required longer periods to achieve slaughter weight than CONT steers (16, 23 and 27 more days for COMP90, COMP120 and COMP150, respectively). The CONT system was the most productive (466 kg/ha/year), followed by COMP90 (443 kg/ha/year), COMP120 (432 kg/ha/year), and COMP150 (383 kg/ha/year). The most profitable system was the COMP90 system (US$ 161/ha) followed by the CONT (US$ 144/ha). The lower net margin was observed in the COMP120 (US$ 107/ha) and COMP150 (US$ 90/ha) systems. The risk analysis showed that COMP90 presented the highest financial stability. For all simulated systems, prices of finished steers, feeder calves, and corn were the variables with the greatest effects on net margin. The use of compensatory growth can be a tool to reduce feeding costs in beef cattle systems; however, the feed restriction must not be longer than three months.
650 $aBOVINO DE CARNE
653 $aCOMPENSATION
653 $aCOMPENSATORY GAIN
653 $aCOMPENSATORY INDEX
653 $aCRECIMIENTO COMPENSATORIO
653 $aSISTEMAS DE PRODUCCIÓN DE GANADO VACUNO
653 $aSTOCHASTIC SIMULATION
700 1 $aCANOZZI, M.E.A.
700 1 $aCANELLAS, L.C
700 1 $aGONZALEZ, F.A.L.
700 1 $aCORRÊA, R.F.
700 1 $aPEREIRA, P.R.R.X
700 1 $aBARCELLOS, J.O.J.
773 $tLivestock Science, October 2018$gv.216,p.165-173.
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