Functional longevity in five rabbit lines founded on different criteria: Comparison at foundation and at fixed times after selection
Visualitza/Obre
Autor/a
EL Nagar, Ayman G.
Baselga, Manuel
Mínguez, Carlos
Santacreu, María A.
Sánchez, Juan Pablo
Data de publicació
2021-03-08ISSN
0931-2668
Resum
The enhancement of rabbit female functional longevity, that is the ability to avoid voluntary culling, is a paramount aspect for the sustainability of meat rabbit production; this trait represents a direct indicator of female robustness. The objective of our study was to compare the functional longevity of five rabbit lines at their foundation and at fixed times during their selection processes. Four of them are maternal lines (A, V, H and LP) selected for litter size at weaning. The fifth line is the paternal line R, founded and selected for post-weaning daily gain from 28 to 63 days. The comparison at foundation involved the complete data set (from March 1980 to March 2013; records of 15,670 does) and pedigree (19,405 animals). Latter comparisons were made when all lines shared the same environmental and management conditions, from March 1997 to September 1998 and from March 2011 to September 2012. In these second comparisons, the same model as that used in the comparison at foundation was used, but now the additive effect was excluded, only data from the corresponding periods were considered. At their foundation, lines V, H and LP showed larger functional longevity than lines A and R, being LP line that with the longest productive life. In the latter comparisons, lines A and R still showing the lowest functional longevities. However, as the selection process evolves, the differences between these two lines and the others were reduced. It could be concluded that the average longevity of a population greatly depends on the criteria followed for its foundation. In addition, along the selection for litter size, the differences of longevity between lines tend to decrease, this is due to an unintended selection for functional longevity, since only offspring from females reaching three parturitions are selected as breeding animals for the next generation.
Tipus de document
Article
Versió del document
Versió acceptada
Llengua
English
Matèries (CDU)
636 - Explotació i cria d'animals. Cria del bestiar i d'animals domèstics
Pàgines
30
Publicat per
Wiley
Publicat a
Journal of Animal Breeding and Genetics
Citació
EL Nagar, Ayman G., Manuel Baselga, Carlos Mínguez, María A. Santacreu, and Juan Pablo Sánchez. 2021. "Functional Longevity In Five Rabbit Lines Founded On Different Criteria: Comparison At Foundation And At Fixed Times After Selection". Journal Of Animal Breeding And Genetics 138 (4): 508-517. doi:10.1111/jbg.12543.
Número de l'acord de la subvenció
MICINN/Programa Nacional de Proyectos de Investigación Fundamental/AGL2011-30170-C02-01/ES/DIVERSIDAD GENETICA EN EL CONEJO DE CARNE. INTERACCIONES CON REPRODUCCION, CRECIMIENTO Y SALUD DIGESTIVA/
Programa
Genètica i Millora Animal
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Drets
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