Milk Fatty-Acid Profile after Feeding Increasing Doses of a Mixture of Soybean and Linseed Oils to Pasture Dairy Cows

Liliana Elisabet Antonacci (Instituto Nacional de Tecnología Agropecuaria (INTA), Estación Experimental Balcarce, Area de Producción Animal, Balcarce, Argentina)
Gerardo Antonio Gagliostro (Instituto Nacional de Tecnología Agropecuaria (INTA), Estación Experimental Balcarce, Area de Producción Animal, Balcarce, Argentina)


The goal was to determine the effect of growing intake of a mixture (75:25) of soybean (SoOi) and linseed (LiOi) oils on milk production and composition and milk fatty-acid (MF-A) profile in grazing dairy cows. Twenty-four Holstein cows were assigned to 4 treatments in a completely randomized design with three weeks of adaptation to oil doses and one week of experimental measurements. On a dry matter (DM) basis, cows were fed pasture (63%), energy concentrate (37%) and the SO-LO oil mixture at zero (Tr0%), 2% (Tr2%), 4% (Tr4%) and 6% (Tr6%) of total DM intake equivalent to 0, 0.36, 0.72 and 1.08 kg/cow/day of the oil mixture. The oil mixture was manually mixed-up to the concentrate (7.04 kg DM cow/day) and supplied by halves during each milking time without refusals. Pasture (P = 0.49) and total DM intakes (P = 0.31) were similar between treatments averaging 11.27 and 18.85 kg DM cow-1 day-1 respectively. Milk output (22.71 kg/cow/day) was not affected (P = 0.46). Milk fat content reduced linearly (P < 0.05) from 3.20 (Tr0%) to 2.67 g 100 g-1 (Tr6%) without effects (P = 0.73) on fat or fat corrected milk (4%FCM) yields. Milk protein concentration (P < 0.56) or yields (P < 0.11 were not affected. Lactose contents tended (P < 0.08) to be higher in oil supplemented cows and milk urea nitrogen was not affected (P = 0.14). The basal (Tr0%) concentration (g /100 g MF-A) of totaly hypercholesterolemic MF-A (C12:0, C14:0 and C16:0) of milk averaged 38.93 and decreased linearly (P < 0.0001) with oil intake to 37.81 (Tr2%), 31.59 (Tr4%) and 29.18 (Tr6%). Levels of elaidic (trans-9 C18:1) and trans-10 C18:1 MF-A resulted low-slung in the basal (Tr0%) milk (0.21 and 0.20 g/100g MF-A, respectively) but increased linearly (P < 0.0001) after oil intake reaching the maximum values at Tr6% (0.73 and 2.23 g/100g MF-A, respectively). Milk concentration (g/100g MF-A) of vaccenic acid (trans-11 C18:1, VA) averaged 3.63 in Tr0% and increased linearly (P < 0.0001) with oil intake reaching 4.97, 7.05 and 8.38 in Tr2%, Tr4% and Tr6%, respectively. Basal concentration of rumenic acid (cis-9. trans-11 C18:2, RA) was 2.28 g/100g MF-A and increased linearly (P < 0.0001) with increased oil dose resulting in maximal plateau in Tr4% (3.88) and Tr6% (3.89). The basal  atherogenic index (AI) of milk was 1.87 and linearly decreased (P < 0.01) to 1.64 (Tr2%), 1.18 (Tr4%) and 0.95 (T6%) after oil intake. The basal Ω6/Ω3 ratio (3.57) was no different (P > 0.05) from T2% (3.37) but was upper (P < 0.05) in Tr4% (4.41) and Tr6% (4.63) remaining under the recommended value of 5:1. Taken together the results suggest that feeding a blend (75:25; SoOi:LiOi) of SiOi an LiOi oils at 4% of total DM intake to pasture dairy cows maximize the milk RA content with a concomitant decrease in the hypercholesterolemic MF-A of milk maintaining a beneficial for health Ω6/Ω3 ratio with low levels of the detrimental trans-9 C18:1 and trans-10 C18:1.


Polyunsaturated oils, Vegetable oils, Rumenic acid

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