Efecto de la suplementación de la dieta con aceite de pescado sobre la abundancia de ARNm de genes implicados en la lipogénesis mamaria en ovejas lecheras

  1. D. Carreño 1
  2. G. Hervás 1
  3. P.G. Toral 1
  4. T. Castro Carrera 1
  5. M. Fernandez 1
  6. P. Frutos 1
  1. 1 CSIC-ULE
XVI Jornadas sobre Producción Animal: 19 y 20 de mayo de 2015, Zaragoza
  1. Javier Álvarez Rodríguez
  2. Begoña Panea Doblado
  3. Jorge Hugo Calvo Lacosta
  4. Mireia Blanco Alibés
  5. José Alfonso Abecia Martínez
  6. Daniel Villalba Mata
  7. María Ángeles Latorre Górriz

Publisher: Asociación Interprofesional para el Desarrollo Agrario

ISBN: 978-84-606-7969-1

Year of publication: 2015

Volume: 1

Pages: 152-154

Congress: Jornadas sobre producción animal (16. 2015. Zaragoza)

Type: Conference paper


This study was conducted in sheep to investigate the relationship between changes in both the mRNA abundance of genes involved in mammary lipogenesis, and the milk fatty acid (FA) composition, in response to a diet known to induce milk fat depression (MFD). Twelve ewes (6 animals/treatment) received a total mixed ration supplemented with 0 (control) or 17 g of fish-oil/kg DM, for 31 days. Milk FA profile was analysed by gas chromatography on samples collected on days 0, 7 and 30, and candidate gene expression by quantitative reverse transcription-PCR on samples of mammary secretory tissue removed by biopsy on days -13, 8 and 31. As expected, the fish-oil supplemented diet induced MFD and modified milk FA composition. Increases in some putative antilipogenic FA (e.g., trans10 18:1, trans-10 cis-12 18:2, and trans-9 cis-11 18:2) were accompanied by reductions in the mRNA abundance of ACACA, FASN, SCD1 and SREBF1, which would support that the nutritional regulation of milk FA composition is mediated by transcriptional control mechanisms. Most variations in mRNA abundance were detected on early stages of the feeding period (day 7) and stayed relatively stable until the end of the assay (d 31).