Influence of TMR [total mixed ration] composition complemented with different grazing times on milk fatty acid profile | Influencia de la composición de la dieta completa suplementada con distintos tiempos de pastoreo sobre el perfil de ácidos grasos en leche
2009
Morales Almaráz, E., Servicio Regional de Investigación y Desarrollo Agroalimentario, Villaviciosa (España). Área de Nutrición Pastos y Forrajes | Vicente, F., Servicio Regional de Investigación y Desarrollo Agroalimentario, Villaviciosa (España). Área de Nutrición Pastos y Forrajes | González, A., Servicio Regional de Investigación y Desarrollo Agroalimentario, Villaviciosa (España). Área de Nutrición Pastos y Forrajes | Soldado, A., Servicio Regional de Investigación y Desarrollo Agroalimentario, Villaviciosa (España). Área de Nutrición Pastos y Forrajes | Martínez Fernández, A., Servicio Regional de Investigación y Desarrollo Agroalimentario, Villaviciosa (España). Área de Nutrición Pastos y Forrajes | Roza Delgado, B. de la, Servicio Regional de Investigación y Desarrollo Agroalimentario, Villaviciosa (España). Área de Nutrición Pastos y Forrajes
The objective was to evaluate the influence of forage type included in a TMR based in maize silage and complemented with different grazing times in dairy cows as a strategy to improve milk fatty acids (FA) profile. Two experiments of three periods each one using thirty Holstein cows blocked and randomly assigned to one of six treatments in arrangement factorial design 2x3. Treatments applied were based in composition of TMR: silage type (maize-Faba bean silages (EML) and maize silage -hay grass (EMH), offered ad libitum indoor and complemented with grazing time: 12, 6 or 0 hours. Treatment EML00 (19.6 kg/d) had higher DMI of TMR and lower for EML12 (11.2 kg/d). Milk production and composition was unaffected by treatments. Vaccenic acid content was notably higher when dairy cows fed EML with six and twelve hours grazing. Increasing to 12 h grazing milk saturated FA concentration decreased and unsaturated FA increased especially conjugated linoleico acid and linolenic acid when feed EML compared with EMH.
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