Concentration of trans-vaccenic and rumenic acids in the milk from grazing cows supplemented with palm oil, rice bran or whole cottonseed

Abstract

-The changes in the concentration of trans-vaccenic (C18:1 t-11 ) and rumenic (C18:2 c-9,t-11 ) acids in the milk from cows grazing on Pennisetum clandestinum, fed a supplement containing palm oil, rice bran or whole cottonseed were evaluated. Three supplements were assessed: one control supplement containing palm oil (C), with a low concentration of linoleic acid mainly from palm oil, and two supplements containing rice bran (RB) or whole cottonseed (CS) as the main source of linoleic acid. Six Holstein cows (4.2±1.7 years of age, 532.5±50.7 kg BW, 125±29 days in milk and a milk yield of 21.7±5.8 kg d −1 ; Mean±SD) were assigned to each treatment using a double 3 × 3 × 3 Latin Square Design. Compared with treatment C, the milk fat concentrations of trans-vaccenic acid (31.1 and 23.8 g kg −1 of fatty acids for RB and C, respectively), rumenic acid (14.1 and 11.3 g kg -1 of fatty acid for RB and C, respectively) and unsaturated fatty acids (348.7 and 325.4 g kg −1of fatty acid for RB and C, respectively) were higher for RB. Compared with C and CS treatments, the Δ 9 -desaturase index was higher for RB (0.37, 0.35 and 0.34 for RB, C and CS, respectively) and the thrombogenicity index was lower (3.09, 3.43 and 3.50 for RB, C and CS, respectively). The atherogenicity index was lower for RB treatment compared with C, but not compared with CS (1.85, 2.03, 1.97 for RB, C and CS, respectively). Supplementing rice bran to grazing dairy cows is a good alternative for producing a kind of milk beneficial to human health, due to its higher concentrations of trans-vaccenic and rumenic acids, unsaturated fatty acids and lower thrombogenicity and atherogenicity indexes.

Supplementation with corn oil and palm kernel oil to grazing cows: ruminal fermentation, milk yield, and fatty acid profile

“…In conditions similar to those in this study, we found similar proportions of 18:2 c9 t11 CLA in milk fat (1.41 g 100 g FA −1 ) with supplementation of high-fat rice bran (Castaño et al, 2014).…”

Intensidad de pastoreo sobre perfil lipídico en leche bovina en el trópico seco colombiano

“…La leche producida en las tres intensidades de pastoreo en pasto Guinea cv. Tanzania, presentaron mayores concentraciones de C8:0, C10:0, C12:0, C14:0, C16:0, concentraciones similares de C18:3 y ALC (c9 t11) y menores concentraciones de C18:0, C18:1, C18:2, en comparación con el perfil de ácidos grasos (promedio) en leche proveniente de sistemas especializados con forrajes templados en Colombia (Rico et al, 2007;León, 2011;Gastón et al, 2014;Parales, 2015).…”

Perfil lipídico en leche de vacas en pastoreo de gramíneas en el trópico seco colombiano

“…La leche producida con los tres cultivares evaluados en este estudio, presentaron mayores concentraciones de C8:0, C10:0, C12:0, C14:0, C16:0, concentrados similares de C18:3 y ALC (c9 t11) y menores cantidades de C18:0, C18:1, C18:2, en comparación con el perfil de ácidos grasos (promedio) en leche proveniente de sistemas especializados con forrajes de zonas templadas en Colombia (Rico et al, 2007;León, 2011;Gastón et al, 2014;Parales, 2015). Con base en lo anterior, los AG saturados en la leche obtenida con los tres cultivares, generarían un efecto negativo sobre la salud humana, sin embargo, debido a la alta concentración de ALC (c9 t11) en la leche se podría conferir un efecto positivo, debido a sus efectos nutraceúticos (anticarcinogénico, antiaterogénico) (Bhattacharya et al, 2006).…”