Reproductive efficiency related traits evaluation in beef genotypes under humid tropical conditions
The objective of the study was to quantify genetic and nongenetic effects, and to estimate genetic variance, on reproductive efficiency traits in a herd with Romosinuano inheritance managed under tropical conditions. Records collected from 1959 to 1989 at the Tropical Agronomic Center for Research and Education, Costa Rica (CATIE), were used to calculate age at first calving (AFC; days) and calving interval (CI; days). Animals with 50% or less Romosinuano inheritance (BG1; n= 496) and with more than 50% Romosinuano inheritance (BG2; n= 1045) were classified as different breed groups. Age of dam influenced AFC and CI (P<.01). Differences by breed group were identified for CI (P<.05), where BG2 had a shorter CI than BG1 (402 ± 6 days and 418 ± 7 days, respectively). Interactions between breed group and environment, and between breeding group and age of dam were observed for CI (P<.05). Repeatability for CI was 0.07 ± 0.0015. Heritability for AFC and CI were 0.28 ± 0.16 and.004 ± 0.0001, respectively. These results indicate that animals with Romosinuano inheritance are reproductively efficient under tropical conditions.
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Asociacion Latinoamericana de Produccion Animal
2005
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oai:ojs.ojs.alpa.uy:article-2552023-01-23T21:09:46Z Reproductive efficiency related traits evaluation in beef genotypes under humid tropical conditions Casas, Eduardo Tewolde, Assefaw Romosinuano age at first calving calving interval genetic parameters reproductive efficiency tropical conditions The objective of the study was to quantify genetic and nongenetic effects, and to estimate genetic variance, on reproductive efficiency traits in a herd with Romosinuano inheritance managed under tropical conditions. Records collected from 1959 to 1989 at the Tropical Agronomic Center for Research and Education, Costa Rica (CATIE), were used to calculate age at first calving (AFC; days) and calving interval (CI; days). Animals with 50% or less Romosinuano inheritance (BG1; n= 496) and with more than 50% Romosinuano inheritance (BG2; n= 1045) were classified as different breed groups. Age of dam influenced AFC and CI (P<.01). Differences by breed group were identified for CI (P<.05), where BG2 had a shorter CI than BG1 (402 ± 6 days and 418 ± 7 days, respectively). Interactions between breed group and environment, and between breeding group and age of dam were observed for CI (P<.05). Repeatability for CI was 0.07 ± 0.0015. Heritability for AFC and CI were 0.28 ± 0.16 and.004 ± 0.0001, respectively. These results indicate that animals with Romosinuano inheritance are reproductively efficient under tropical conditions. Asociacion Latinoamericana de Produccion Animal 2005-03-13 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Articulo cientifico original Texto application/pdf https://ojs.alpa.uy/index.php/ojs_files/article/view/255 Latin American Archives of Animal Production; Vol. 9 No. 2 (2001) Archivos Latinoamericanos de Producción Animal; Vol. 9 Núm. 2 (2001) 2075-8359 1022-1301 spa https://ojs.alpa.uy/index.php/ojs_files/article/view/255/241 |
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Casas, Eduardo Tewolde, Assefaw Reproductive efficiency related traits evaluation in beef genotypes under humid tropical conditions |
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Casas, Eduardo Tewolde, Assefaw |
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Casas, Eduardo |
title |
Reproductive efficiency related traits evaluation in beef genotypes under humid tropical conditions |
title_short |
Reproductive efficiency related traits evaluation in beef genotypes under humid tropical conditions |
title_full |
Reproductive efficiency related traits evaluation in beef genotypes under humid tropical conditions |
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Reproductive efficiency related traits evaluation in beef genotypes under humid tropical conditions |
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Reproductive efficiency related traits evaluation in beef genotypes under humid tropical conditions |
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reproductive efficiency related traits evaluation in beef genotypes under humid tropical conditions |
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The objective of the study was to quantify genetic and nongenetic effects, and to estimate genetic variance, on reproductive efficiency traits in a herd with Romosinuano inheritance managed under tropical conditions. Records collected from 1959 to 1989 at the Tropical Agronomic Center for Research and Education, Costa Rica (CATIE), were used to calculate age at first calving (AFC; days) and calving interval (CI; days). Animals with 50% or less Romosinuano inheritance (BG1; n= 496) and with more than 50% Romosinuano inheritance (BG2; n= 1045) were classified as different breed groups. Age of dam influenced AFC and CI (P<.01). Differences by breed group were identified for CI (P<.05), where BG2 had a shorter CI than BG1 (402 ± 6 days and 418 ± 7 days, respectively). Interactions between breed group and environment, and between breeding group and age of dam were observed for CI (P<.05). Repeatability for CI was 0.07 ± 0.0015. Heritability for AFC and CI were 0.28 ± 0.16 and.004 ± 0.0001, respectively. These results indicate that animals with Romosinuano inheritance are reproductively efficient under tropical conditions. |
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Asociacion Latinoamericana de Produccion Animal |
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2005 |
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https://ojs.alpa.uy/index.php/ojs_files/article/view/255 |
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AT casaseduardo reproductiveefficiencyrelatedtraitsevaluationinbeefgenotypesunderhumidtropicalconditions AT tewoldeassefaw reproductiveefficiencyrelatedtraitsevaluationinbeefgenotypesunderhumidtropicalconditions |
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