R Ponz

Publications (6)8.25 Total impact

• Article: Scrapie resistance alleles are not associated with lower prolificity in Rasa Aragonesa sheep.

  R Ponz, M T Tejedor, L V Monteagudo, M V Arruga
  [show abstract] [hide abstract]
  ABSTRACT: Scrapie is a prion disease characterised by the accumulation of the pathological associated form of cellular prion protein (PrP(SC)) in the central nervous system. Susceptibility to scrapie is associated with polymorphism in the ovine prion protein (PrP) gene. The European Union has implemented scrapie control programs, relying on selective breeding for scrapie resistance; the use of ARR-carrier and the exclusion of VRQ-carrier were recommended. In this study, 4323 individuals from Rasa Aragonesa Sheep breed were genotyped for the PrP gene and the individual estimated breeding values (EBV) for prolificity were calculated. Most represented PrP alleles do not work against prolificity. Only a significant association between VRQ/VRQ genotype and a lower EBV was observed (p = 0.027, eta2 = 0.002). Therefore, avoiding reproduction of VRQ/VRQ individuals would not cause negative effect regarding prolificity.
  Research in Veterinary Science 09/2006; 81(1):37-9. · 1.65 Impact Factor
• Article: Scrapie resistance alleles are not associated with lower prolificity in Rasa Aragonesa sheep.

  R. PONZ, M. T. TEJEDOR, L. V. MONTEAGUDO, M. V. ARRUGA
  Research in Veterinary Science 01/2006; 81:37-39. · 1.65 Impact Factor
• Article: Mapeo del gen MC1-R responsable del color del vellón y del gen LYZ que codifica la proteína lysozima estomacal en ovinos, mediante la técnica PRINS.

  R. PONZ, M. V. ARRUGA
  Acta veterinaria 01/2005; 40(158):24-25. · 0.17 Impact Factor
• Article: Prolificidad y selección por genotipo PrP en Rasa Aragonesa.

  R. PONZ, M. T. TEJEDOR, L. V. MONTEAGUDO, M. V. ARRUGA
  Información técnica económica agraria 01/2005; 26(1):144-146. · 0.25 Impact Factor
• Article: Assessment of genetic variation explained by markers for wool traits in sheep via a segment mapping approach.

  R Ponz, C Moreno, D Allain, J M Elsen, F Lantier, I Lantier, J C Brunel, M Pérez-Enciso
  Mammalian Genome 08/2001; 12(7):569-72. · 2.89 Impact Factor
• Source

  Available from: M. Teresa Tejedor

  Article: Analysis of microsatellites and paternity testing in Rasa Aragonesa sheep.

  M V Arruga, L V Monteagudo, M T Tejedor, R Barrao, R Ponz
  [show abstract] [hide abstract]
  ABSTRACT: Four microsatellite loci (MAF50, MAF18, OarFCB20 and MCM527) were studied in Rasa Aragonesa sheep in order to evaluate their use in paternity testing. Several population characteristics were estimated [allele frequencies. effective allele number (Ne), polymorphism informative content (PIC) and probability of excluding wrong paternities (Pe)]. In 32 randomly chosen individuals, four alleles were detected for MAF50, with 2.55 effective alleles, 0.58 PIC and 0.35 Pe. For MAF18, five alleles were identified, with 2.99 effective alleles, 0.51 PIC and 0.32 Pe. For oarFCB20, 10 alleles were observed, with 6.06 effective alleles, 0.82 PIC and 0.68 Pe. Finally, for MCM527, six alleles were found, with 3.75 effective alleles, 0.69 PIC and 0.50 Pe. When these loci were used together with serum transferrin locus, Pe rose to 97.20 per cent. Field trials confirmed the real usefulness of these techniques.
  Research in Veterinary Science 07/2001; 70(3):271-3. · 1.65 Impact Factor