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Crossbreeding effects on pig growth and carcass traits from two Iberian strains

Published online by Cambridge University Press:  14 July 2014

N. Ibáñez-Escriche ,
L. Varona ,
E. Magallón  and
J. L. Noguera
N. Ibáñez-Escriche*
Affiliation:
Genètica i Millora Animal, IRTA, Av. Alcalde Rovira Roure 191, 25198 Lleida, Spain
L. Varona
Affiliation:
Unidad de Genética y Mejora Animal, Universidad de Zaragoza, C./ Miguel Servet 177, 50013 Zaragoza, Spain
E. Magallón
Affiliation:
INGA FOOD S.A. C./ Baleares SN, Casetas, 50620 Zaragoza, Spain
J. L. Noguera
Affiliation:
Genètica i Millora Animal, IRTA, Av. Alcalde Rovira Roure 191, 25198 Lleida, Spain
*
†E-mail: Noelia.ibanez@irta.es
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Abstract

An experiment of a 2×2 full diallelic cross between two contemporary Iberian pig strains (Retinto: RR, and Torbiscal: TT) was conducted to estimate the crossbreeding effects for growth and carcass traits. Phenotypic records were obtained under intensive management and consisted of two different data sets. The first set comprised growth traits until weaning and was collected at two different farms (6236 and 1208 records, respectively). Specific data included individual piglet weight at birth and at weaning at 28 days and average daily gain from birth to weaning at 28 days (ADG28) for both RR and TT and their reciprocal crosses. The second set comprised growth data from birth to slaughter (~340 days and ~160 kg) and carcass traits from 349 individuals (randomly) sampled at weaning from the first dataset. Data were analyzed through a Bayesian analysis by using a reparameterization of Dickerson’s model that allowed estimation of the posterior distributions of the following crossbreeding effects: average maternal breed effect (gM), average paternal breed effect (gP) and individual heterosis (hI). Results showed that the relative magnitude of crossbreeding effects depends on the trait analyzed. Crosses where Torbiscal strain was used as mother (RT and TT) achieved the greatest performance for all growth traits at weaning, leading to remarkable gM effects. The most outstanding example is the case of ADG28 where the probability of relevance was one. In contrast, TR cross showed the greatest differences from RR cross for all growth at slaughter and carcass traits. These differences were mainly due to hI and gP crossbreeding parameters. In particular, the posterior mean of hI was more noticeable for live weight at slaughter, average daily gain at slaughter and carcass length, while gP was more relevant for hams (kg) and loins (kg) representing from 3% to10% of average performance of traits. Hence, growth traits at weaning did not reveal any notable advantage of the crossbreeding scheme because of the superiority of the Torbiscal strain with respect to its mothering ability and the small hI. However, results from growth and carcass traits at slaughter would support the implementation of a TR crossbred system. It would allow exploitation of both the gP of the Torbiscal strain and the hI between these two Iberian pig strains. Additionally, gP estimates and phenotypic differences between reciprocal crosses might suggest signs of the presence of paternal genetic imprinting in primal cuts traits.

Keywords

diallelic crosscrossbreedingIberian piggrowth performanceimprinting
Type
Research Article
Information
animal , Volume 8 , Issue 10 , October 2014 , pp. 1569 - 1576
Copyright
© The Animal Consortium 2014 

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