A cross-specific multiplicative binomial recursive model for the analysis of perinatal mortality in a diallel cross among three varieties of Iberian pig
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Author
Varona, Luis
Martín de Hijas, Melani
Rosas, Juan Pablo
Ibáñez-Escriche, Noelia
Publication date
2020-12-03ISSN
2045-2322
Abstract
Perinatal piglet mortality is an important factor in pig production from economic and animal welfare
perspectives; however, the statistical analysis of mortality is difcult because of its categorical nature.
Recent studies have suggested that a binomial model for the survival of each specifc piglet with a
logit approach is appropriate and that recursive relationships between traits are useful for taking
into account non-genetic relationships with other traits. In this study, the recursive binomial model
is expanded in two directions: (1) the recursive phenotypic dependence among traits is allowed to
vary among groups of individuals or crosses, and (2) the binomial distribution is replaced by the
multiplicative binomial distribution to account for over or underdispersion. In this study, fve recursive
multiplicative binomial models were used to obtain estimates of the Dickerson crossbreeding
parameters in a diallel cross among three varieties of Iberian pigs [Entrepelado (EE), Torbiscal (TT),
and Retinto (RR)]. Records (10,255) from 2110 sows were distributed as follows: EE (433 records, 100
sows), ER (2336, 527), ET (942, 177), RE (806, 196), RR (870, 175), RT (2450, 488), TE (193, 36), TR
(1993, 359), and TT (232, 68). Average litter size [Total Number Born (TNB)] and number of stillborns
(SB) were 8.46 ± 2.27 and 0.25 ± 0.72, respectively. The overdispersion was evident with all models.
The model with the best ft included a linear recursive relationship between TNB and the logit of φ of
the multiplicative binomial distribution, and it implies that piglet mortality increases with litter size.
Estimates of direct efects showed small diferences among populations. The analysis of maternal
efects indicated that the dams whose mothers were EE had a larger SB, while dams with RR mothers
reduced the probability of born dead. The posterior estimates of heterosis suggested a reduction in
SB when the sow is crosbred. The multiplicative binomial distribution provides a useful alternative to
the binomial distribution when there is overdispersion in the data. Recursive models can be used for
modeling non-genetic relationships between traits, even if the phenotypic dependency between traits
varies among environments or groups of individuals. Piglet perinatal mortality increased with TNB and
is reduced by maternal heterosis.
Document Type
Article
Document version
Published version
Language
English
Subject (CDU)
619 - Veterinary science
Pages
10
Publisher
Nature Research
Is part of
Scientific Reports
Citation
Varona, Luis, José Luis Noguera, Joaquim Casellas, Melani Martín de Hijas, Juan Pablo Rosas, and Noelia Ibáñez-Escriche. 2020. "A Cross-Specific Multiplicative Binomial Recursive Model For The Analysis Of Perinatal Mortality In A Diallel Cross Among Three Varieties Of Iberian Pig". Scientific Reports 10 (1). doi:10.1038/s41598-020-78346-7.
Grant agreement number
CDTI/ /IDI-20170304/ES/ /
MINECO/Programa Estatal de I+D+I orientada a los retos de la sociedad/CGL2016-80155-R/ES/Analisis "Ómico" de caracteres reproductivos en un cruce dialélico entre tres estirpes de cerdo ibérico/IBEROMICS
Program
Genètica i Millora Animal
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