Innovaciones en el programa de selección de Rasa aragonesa de UPRA-Grupo Pastores
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Date
2017
Authors
Riaguas, L.Fantova Puyalto, Enrique
Calvo Lacosta, Jorge Hugo
Alabart Alvarez, José Luis
Folch Pera, José
Lahoz Crespo, Belén
Jurado, J.J.
Jiménez, M.A.
Serrano, Mª Magdalena
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Abstract
The Cooperative Oviaragon-Grupo Pastores carries out since 1994 a selection program for prolificacy in
Rasa Aragonesa sheep, with 216.232 ewes at present. Sires of higher estimated breeding values are
produced within the scheme by MOET, increasing the performance of this technology through the
measurement of plasmatic Anti-Müllerian Hormone (AMH) in ewe embryo donors, an endocrine marker
of the ovarian activity. Within this program a natural genetic prolific variant was found in 2007 (FecXR
allele, BMP15 gene). Its effect on prolificacy leads to an increase of 0.35 lambs/lambing ewe when
compared with non-carrier ewes, with an additive effect over the standard hormonal treatments used in
farms. Recently, new variants in MTNR1A gene associated to reproductive seasonality have been
detected in Rasa aragonesa breed. Non-linked SNPs in promoter and exon 2 regions have been detected
decreasing the length of non-cycling period (considering anoestrus those periods with three or more
consecutive weekly-sampled progesterone concentrations lower than 0.5 ng/ml) as much as 30 and 53
days, respectively, from January to August. In the same way, the allele located in exon 2 was also
associated to an increase of 15 % of oestrus cycling months (based on oestrus records). Due to their
productive interest, a controlled program for the outreach of FecXR allele and MTNR1A alleles has been
developed. Finally, a polygenic selection program for maternal capacity is being carried out. The
selection program goes on with a combined polygenic selection for prolificacy, maternal capacity and
dissemination of FecXR and MTNR1A alleles.
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AGROVOC subjects
Razas autóctonasOvinos
Mejora genética