Efecto de la adición de 18:0 a una dieta rica en aceite de pescado sobre el rendimiento productivo y el perfil de ácidos grasos de la leche de ovejas lecheras
- P.G. Toral 1
- G. Hervás 1
- D. Carreño 1
- J.S. Gonzalez 1
- J. Amor 1
- P. Frutos 1
- 1 CSIC-ULE
- Javier Álvarez Rodríguez
- Begoña Panea Doblado
- Jorge Hugo Calvo Lacosta
- Mireia Blanco Alibés
- José Alfonso Abecia Martínez
- Daniel Villalba Mata
- María Ángeles Latorre Górriz
Editorial: Asociación Interprofesional para el Desarrollo Agrario
ISBN: 978-84-606-7969-1
Año de publicación: 2015
Volumen: 1
Páginas: 161-163
Congreso: Jornadas sobre producción animal (16. 2015. Zaragoza)
Tipo: Aportación congreso
Resumen
Diet supplementation with fish oil (FO) modulates the fatty acid (FA) profile of sheep milk but induces milk fat depression (MFD). This response has been associated with a shortage of 18:0 for mammary cis-9 18:1 synthesis (through ǻ-desaturation) and its potential impact on the maintenance of milk fat fluidity. This study was, therefore, conducted to test the hypothesis that supplemental 18:0 would alleviate FO-induced MFD in ewes. The experiment followed a 3×3 Latin square design (4 animals/group) with 3 periods of 4 weeks each and 3 experimental diets: non-supplemented, supplemented with 2% FO or 2% FO plus 2% 18:0. Afterwards, the digestibility of additional 18:0 was measured using 6 lactating sheep. Compared with the control, both supplemented diets reduced milk fat content in a similar proportion (20%), suggesting that the inclusion of 18:0 does not alleviate FO-induced MFD. This result cannot be fully explained by the relatively low digestibility coefficient of additional 18:0, although this supplement partially compensated for the decrease in milk cis-9 18:1 concentration associated with FO intake. Changes in the proportion of odd- and branchedchain and biohydrogenation-derived FA (which suggest, for example, a shift from trans-11 to trans-10 18:1) might contribute to explain the unsuccessful response to the addition of 18:0.