The Animal Biology

EFFECT OF SOYBEANS AND PALM OIL ADDITION TO THE COWS DIETS ON MILK FATTY ACIDPROFILE

O. V. Hultiaieva¹, A.P. Petruk², O. V. Golubets³, I. V. Vudmaska¹, V. V. Vlizlo¹

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Effects of soybean and palm oil supplements on milk yields and fatty acids composition with considering intermediate products of unsaturated fatty acids hydrogenation were investigated. Fifteen multiparous Holstein cows in mid-lactation were assigned to groups of 5 each. Cows of control group fed (kg): alfalfa hay — 6; corn silage — 20; grass silage — 10; wheat — 3; corn — 2; soybean meal — 1; molasses — 2. In the diet of the 1st treated group, soybean meal was replaced by 1.5 kg of extruded soybeans. Diet of 2nd treated group cows was supplemented with 0.3 kg of palm oil. All diets were equivalent in contents of nutrients (except fat). Crude fat content in the diets was 0.70, 0.96 and 0.97 kg/cow/day, respectively. Treatment lasted2 months. Milk yield was recorded weekly for the duration of the study. The milk fatty acids methyl esters were then quantified by gas chromatography.

In the milk of cows fed diet with soybeans was found 2.2 times more of trans-11 18:1 (P<0.001) and 1.3 times more of cis-9,trans-11 18:2 (P<0.05) fatty acids compared to cows of control group.Trans-11 18:1 and cis-9,trans-11 18:2act in animal and human tissuesasantagonists of ω-6 fatty acids and, respectively, they are synergists of ω-3 fatty acids. Thus an increased content of these acids improves milk dietary value.

Cowsof bothtreatedgroups hadhighermilk proteinyield for40 gdaily(P<0.05).Milk fatyield wasincreasedonlyin cowsfed palm oil, it was 50ggreaterthan in control cows(P<0.05). Bothfatsupplementsincreased theaverage dailymilk yields. Milk yield of cowsfed diet with soybeans additionwas higher by 4 % (P<0.05), and in cows fed diet with palm oil milk yield grew to 7 % (P<0.05). Fat corrected milk yield wasincreasedonly incowsfed diet with palm oil addition(P<0.05). The results of the present study indicate a benefits of feeding cows by palm oil as dietary supplement.

Keywords: COWS, MILK, FATTY ACIDS, SOYBEANS, PALM OIL

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