Título : Milk’s fatty acid profile due to the inclusion of pasture in the diet of dairy cows fed with a total mixed ration
Autor(es) : Casarotto, G.
Véliz, P.
López, A.
Bonfiglio, C.
Vieitez, I.
Britos, A.
Repetto, J. L.
Carro, S.
Cajarville, C.
Fecha de publicación : jul-2023
Tipo de publicación: Documento de conferencia
Versión: Publicado
Publicado en: American Dairy Science Association Annual Meeting
Areas del conocimiento : Ciencias Agrícolas
Producción Animal y Lechería
Otros descriptores : CLA
milk fat composition
omega-3
Resumen : The aim was to evaluate the impact of partially replacing a TMR with fresh alfalfa in lactating cows on the milk’s fatty acid profile (FA). Twelve multiparous cows were used in a change-over design and randomly assigned to one of two feeding strategies: T1) 100% TMR; T2) 60% TMR + fresh alfalfa grazed without limit of quantity. Each experimental period lasted 26 days (21 days adaptation, 5 days sampling). Fat was extracted from individual milk samples, and FA profile was determined by gas chromatography. Data were analyzed by ProcMixed and means separated by LSMeans (SAS®). The model included the effect of the period and the sequence of treatment application. Differences between periods were observed for some FA, which could be due to some changes in the diet composition during the study, a common problem in this kind of design. On the other hand, no differences were found in the sequence of treatment. Even if the UFA:SFA ratio was not improved, important changes in the milk FA profile were observed. Stearic acid (18:0) decreased in T2, which can provide health benefits for humans. The levels of α-Linolenic (18:3 c9, c12, c15), Rumenic (CLA, 18:2 c9, t11), and Vaccenic acid (TVA, 18:1 t11) were significantly higher on T2 (p<0.05), consistent with the use of pasture. The α-Linolenic in humans reduces the risk of chronic health issues, and Rumenic acid has been shown to bring strong physiological functions, especially anticarcinogenic effects.
URI / Handle: https://hdl.handle.net/20.500.12381/3500
Recursos relacionados en REDI: https://hdl.handle.net/20.500.12381/3501
https://hdl.handle.net/20.500.12381/3502
https://hdl.handle.net/20.500.12381/3503
https://hdl.handle.net/20.500.12381/3505
ISSN: 1525-3198
Institución responsable del proyecto: Universidad de la República. Facultad de Veterinaria
Financiadores: Agencia Nacional de Investigación e Innovación
Ministerio de Ganadería, Agricultura y Pesca
Instituto Nacional de Investigación Agropecuaria
Identificador ANII: FSA_1_2018_1_152588
Nivel de Acceso: Acceso abierto
Licencia CC: Reconocimiento-NoComercial-SinObraDerivada 4.0 Internacional. (CC BY-NC-ND)
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