Genetic comparison of breeding schemes based on semen importation and local breeding schemes: framework and application to Costa Rica
Local breeding schemes for Holstein cattle of Costa Rica were compared with the current practice based on continuous semen importation (SI) by deterministic simulation. Comparison was made on the basis of ge- netic response and correlation between breeding goals. A local breeding goal was d...
| Autores Principales: | VAN ARENDONK, J.A.M., Vargas, Bernardo |
|---|---|
| Formato: | Artículo |
| Idioma: | Inglés |
| Publicado: |
American Dairy Science Association
2022
|
| Materias: | |
| Acceso en línea: |
http://hdl.handle.net/11056/24078 https://doi.org/10.3168/jds.S0022-0302(04)73301-9 |
| id |
RepoUNACR24078 |
|---|---|
| recordtype |
dspace |
| spelling |
RepoUNACR240782022-10-11T22:26:46Z Genetic comparison of breeding schemes based on semen importation and local breeding schemes: framework and application to Costa Rica VAN ARENDONK, J.A.M. Vargas, Bernardo DAIRY CATTLE GANADO DE LECHE GENETICA ANIMAL GENETIC PARAMETERS ANIMAL GENETICS COSTA RICA Local breeding schemes for Holstein cattle of Costa Rica were compared with the current practice based on continuous semen importation (SI) by deterministic simulation. Comparison was made on the basis of ge- netic response and correlation between breeding goals. A local breeding goal was defined on the basis of prevail- ing production circumstances and compared against a typical breeding goal for an exporting country. Differ- ences in genetic response were <3%, and the correlation between breeding goals was 0.99. Therefore, difference between breeding objectives proved negligible. For the evaluation of genetic response, the current scheme based on SI was evaluated against a progeny testing (PT) scheme and a closed nucleus (CN) breeding scheme, both local. Selection intensities and accuracy of selection were defined according to current popula- tion size and reproduction efficiency parameters. When genotype × environment interaction (G × E) was ig- nored, SI was the strategy with the highest genetic response: 5.0% above the CN breeding scheme and 33.2% above PT. A correlation between breeding values in both countries lower than one was assumed to assess the effect of G × E. This resulted in permanent effects on the relative efficiencies of breeding strategies because of the reduction in the rate of genetic response when SI was used. When the genetic correlation was assumed equal to 0.75, the genetic response achieved with SI was reduced at the same level as local PT. When an initial difference in average genetic merit of the popula- tions was assumed, this only had a temporal effect on the relative ranking of strategies, which is reverted after some years of selection because the rate of change in genetic responses remains unchanged. Given that the actual levels of genetic correlation between coun- tries may be around 0.60, it was concluded that a local breeding scheme based on a nucleus herd could provide better results than the current strategy based on SI. Se compararon los esquemas locales de cría de ganado Holstein de Costa Rica con la práctica actual basada en la importación continua de semen (SI) mediante simulación determinista. La comparación se hizo sobre la base de la respuesta genética y la correlación entre los objetivos de cría. Se definió un objetivo de cría local sobre la base de las circunstancias de producción imperantes y se comparó con un objetivo de cría típico de un país exportador. Las diferencias en la respuesta genética fueron de <3%, y la correlación entre los objetivos de cría fue de 0,99. Por lo tanto, las diferencias entre los objetivos de cría resultaron insignificantes. Para la evaluación de la respuesta genética, el esquema actual basado en la IS se evaluó frente a un esquema de pruebas de progenie (PT) y un esquema de cría en núcleo cerrado (CN), ambos locales. Las intensidades de selección y la precisión de la selección se definieron en función de los parámetros de tamaño de la población y eficiencia reproductiva actuales. Cuando se siguió la interacción genotipo × ambiente (G × E), la estrategia con mayor respuesta genética fue la SI: 5,0% por encima del esquema de cría CN y 33,2% por encima de PT. Para evaluar el efecto de G × E se supuso una correlación entre los valores de cría de ambos países inferior a la unidad, lo que dio lugar a efectos permanentes en las eficiencias relativas de las estrategias de cría debido a la reducción de la tasa de respuesta genética cuando se utilizó SI. Cuando se supuso que la correlación genética era igual a 0,75, la respuesta genética conseguida con la IS se redujo al mismo nivel que la PT local. Cuando se supuso una diferencia inicial en el mérito genético medio de las poblaciones, esto sólo tuvo un efecto temporal en la clasificación relativa de las estrategias, que se revierte después de algunos años de selección porque la tasa de cambio de las respuestas genéticas permanece inalterada. Dado que los niveles reales de correlación genética entre países pueden ser de alrededor de 0,60, se concluyó que un esquema de cría local basado en un rebaño núcleo podría proporcionar mejores resultados que la estrategia actual basada en la SI. Universidad Nacional, Costa Rica Escuela de Medicina Veterinaria 2022-10-11T22:23:50Z 2022-10-11T22:23:50Z 2004-05-01 http://purl.org/coar/resource_type/c_6501 http://hdl.handle.net/11056/24078 https://doi.org/10.3168/jds.S0022-0302(04)73301-9 eng Acceso abierto http://creativecommons.org/licenses/by-nc-nd/4.0/ application/pdf American Dairy Science Association Journal of Dairy Science Vol. 87, No. 5 : 1496–1505, 2004 |
| institution |
Universidad Nacional de Costa Rica |
| collection |
Repositorio UNA-Costa Rica |
| language |
Inglés |
| topic |
DAIRY CATTLE GANADO DE LECHE GENETICA ANIMAL GENETIC PARAMETERS ANIMAL GENETICS COSTA RICA |
| spellingShingle |
DAIRY CATTLE GANADO DE LECHE GENETICA ANIMAL GENETIC PARAMETERS ANIMAL GENETICS COSTA RICA VAN ARENDONK, J.A.M. Vargas, Bernardo Genetic comparison of breeding schemes based on semen importation and local breeding schemes: framework and application to Costa Rica |
| description |
Local breeding schemes for Holstein cattle of Costa
Rica were compared with the current practice based
on continuous semen importation (SI) by deterministic
simulation. Comparison was made on the basis of ge-
netic response and correlation between breeding goals.
A local breeding goal was defined on the basis of prevail-
ing production circumstances and compared against a
typical breeding goal for an exporting country. Differ-
ences in genetic response were <3%, and the correlation
between breeding goals was 0.99. Therefore, difference
between breeding objectives proved negligible. For the
evaluation of genetic response, the current scheme
based on SI was evaluated against a progeny testing
(PT) scheme and a closed nucleus (CN) breeding
scheme, both local. Selection intensities and accuracy
of selection were defined according to current popula-
tion size and reproduction efficiency parameters. When
genotype × environment interaction (G × E) was ig-
nored, SI was the strategy with the highest genetic
response: 5.0% above the CN breeding scheme and
33.2% above PT. A correlation between breeding values
in both countries lower than one was assumed to assess
the effect of G × E. This resulted in permanent effects on
the relative efficiencies of breeding strategies because of
the reduction in the rate of genetic response when SI
was used. When the genetic correlation was assumed
equal to 0.75, the genetic response achieved with SI
was reduced at the same level as local PT. When an
initial difference in average genetic merit of the popula-
tions was assumed, this only had a temporal effect on
the relative ranking of strategies, which is reverted
after some years of selection because the rate of change
in genetic responses remains unchanged. Given that
the actual levels of genetic correlation between coun-
tries may be around 0.60, it was concluded that a local breeding scheme based on a nucleus herd could provide
better results than the current strategy based on SI. |
| format |
Artículo |
| author |
VAN ARENDONK, J.A.M. Vargas, Bernardo |
| author_sort |
VAN ARENDONK, J.A.M. |
| title |
Genetic comparison of breeding schemes based on semen importation and local breeding schemes: framework and application to Costa Rica |
| title_short |
Genetic comparison of breeding schemes based on semen importation and local breeding schemes: framework and application to Costa Rica |
| title_full |
Genetic comparison of breeding schemes based on semen importation and local breeding schemes: framework and application to Costa Rica |
| title_fullStr |
Genetic comparison of breeding schemes based on semen importation and local breeding schemes: framework and application to Costa Rica |
| title_full_unstemmed |
Genetic comparison of breeding schemes based on semen importation and local breeding schemes: framework and application to Costa Rica |
| title_sort |
genetic comparison of breeding schemes based on semen importation and local breeding schemes: framework and application to costa rica |
| publisher |
American Dairy Science Association |
| publishDate |
2022 |
| url |
http://hdl.handle.net/11056/24078 https://doi.org/10.3168/jds.S0022-0302(04)73301-9 |
| _version_ |
1796096968519319552 |
| score |
12.235121 |