Bovine Milk Fatty Acid Profiles Produced by Feeding DietsContaining Solin, Flax and Canola

Abstract

Fatty acid profiles with emphasis on linoleic, linolenic, oleic, and conjugated linoleic acid (CLA) were compared in milk from dairy cows fed diets containing 3.25% supplemental fat and a control diet containing no supplemented fat. The fat was supplied by either whole ground solin, flax, or canola oilseed. Solin (linola) is a new cultivar of flax that contains 28% linoleic acid in the seed, Twelve multiparous Holstein cows were assigned to one of four dietary treatments. The experimental design was a 4 x 4 Latin square with each period consisting of 16 d for adjustment to the diet followed by a 5-d sampling period. Feed intake, milk yield, milk fat yield, and milk fat percentage were not affected by treatment. Adding solin, flax, or canola oilseed to lactation diets produced the highest proportions of linoleic (C18:2), linolenic (C18:3), and oleic (C18:1) acids, respectively, in the lipid fraction of the milk of the cows consuming these diets. The proportions of C6:0 to C16:1 were depressed in the milk fat of cows fed the oilseed diets, compared with the control diet. Increasing the lactation diet levels of C18:2, by using different oilseeds, increased CLA to 1.5% of milk fatty acids. The content of CLA in milk fatty acids, however, did not increase with the solin-supplemented diet compared with the canola-supplemented diet even though the C18:2 level was higher in the former diet.

Milk yield and reproductive performance of dairy heifers and cows supplemented with polyunsaturated fatty acids

“…The increased milk yield of supplemented cows (Table 4) agrees with the majority of studies in the literature (Scott et al, 1995;Petit et al, 2004;Dirandeh et al, 2013), although some authors report that the supplementation with fatty acids does not affect milk production (Ward et al, 2002;Gonthier et al, 2005). Petit et al (2004) suggest that a greater fat mobilization contributes for a greater milk yield in cows supplemented with fatty acids.…”

Milk performance of dairy cows supplemented with rape seed oil, peanut oil, and sunflower seed oil

“…However, fat supplementation at 2% of dietary DM resulted in an average 11.7% increase in milk fat yield compared with that of the control treatment. Some researchers (Bell et al, 2006) reported that fat supplementation resulted in a decrease in milk fat content while others reported no effect (Ward et al, 2002;Bu et al, 2007). The reduction of milk fat content may be due to the fact that too much unsaturated FA destroy the membrane of bacteria and further decrease the fibre digestion, which may cause decreased acetate production (Onetti et al, 2001;Ye et al, 2009).…”

Effect of a supplement rich in linolenic acid added to the diet of post partum dairy cows on ovarian follicle growth, and milk and plasma fatty acid compositions

“…However, the same group [14] showed that in vitro 18:2n-6 inhibited stimulated PGF2α production by maternal endometrial cells as did a mixture of conjugated linoleic acids (CLA). Ward et al [15] showed that a diet supplemented with 18:2n-6 was more effective in increasing CLA than a diet supplemented with 18:3n-3, possibly because extra steps are required to produce CLA from 18:3n-3 compared to 18:2n-6 [16]. Therefore, the synthesis of series 2 PG could be affected in several ways.…”