Factores de variación del contenido en ácidos grasos de leche de oveja
- L.F. De La Fuente 1
- E. Barbosa 2
- J.A. Carriedo 1
- R. Arenas 2
- B. Prieto 2
- J.M. Fresno 2
- 1 Departamento de Producción Animal, Universidad de León.
- 2 Departamento de Higiene y Tecnología de los Alimentos. Universidad de León
- Luis Rodríguez Ruiz (coord.)
- Juan Antonio Olmedo Olmedo (coord.)
- Sara Olmedo de la Cruz (coord.)
- Luis Fernando de la Fuente Crespo (coord.)
- Ana Belén Martín Diana (coord.)
- María Cristina León Cofreces (coord.)
- Elena Ordás Alesanco (coord.)
- Mariano Herrera García (dir. congr.)
Publisher: Instituto Tecnológico Agrario de Castilla y León ; Junta de Castilla y León
ISBN: 978-84-938243-0-3
Year of publication: 2010
Pages: 456-460
Congress: Sociedad Española de Ovinotecnia y Caprinotecnia (SEOC). Jornadas (35. 2010. Valladolid)
Type: Conference paper
Abstract
Between January 2006 and December 2007, a total of 4,579 test day observations for contents of milkfatty acids (FA) were obtained from 2,218 lactations of 1,109 ewes belonging to 14 Churra dairy flocks.Flock, day of testing within flock (DC), ewe age, stage of lactation, and season effects contributed significantlyto variations in FA. The two most important variation factors were flock (3% to 30% of totalvariance) and DC (35% to 70% of total variance). The percentage of variance explained by DC effectfor conjugated linoleic acid (CLA, C18:2 cis-9, trans-11) and linolenic acid (C18:3 cis-9, cis-12, cis-15) was particularlyhigh: 60.7% and 68.2%, respectively. The CLA and the CLA/C18:1 trans-11 Δ9–desaturase index increasedsignificantly throughout lactation (18% y 22%, respectively). The most significant seasonalvariations were observed in polyunsaturated FA; the highest values occurring in spring and summerand the lowest in winter. More specifically, CLA and linolenic acid contents were 44% and 30% higherin spring-summer than in winter.