Naslov
Total blood cholesterol level, palmitic and stearic fatty acid in milk of Simmental cows fed unprotected sunflower oil

Autori
Marenjak, Terezija Silvija ; Poljičak-Milas, Nina

Vrsta, podvrsta i kategorija rada
Sažeci sa skupova, sažetak, znanstveni

Izvornik
24th Buiatrics Congress - Buiatrics and Society: Challenges and Opportunities / Navetat, H., Schelscher F. - Nica : WBC2006 ISBN 2-903 62 3407, 2006, CD 15/25 Ref: OS47-1

Skup
XXIVth World Buiatrics Congress

Mjesto i datum
Nica, Francuska, 15.10.2006. - 19.10.2006

Vrsta sudjelovanja
Predavanje

Vrsta recenzije
Međunarodna recenzija

Ključne riječi
fatty acids; Simmental cows; milk; blood cholesterol

Sažetak
The fat supplements are often incorporated into the diet of dairy cattle to increase the feed energy of ration and to improve the fatty acid composition in milk fat, but also to enhance the overall animal productive conditions. The objective of this study was to determine an effect of unprotected sunflower oil to the total blood cholesterol, palmitic (C16:0) and stearic (C18:0) fatty acid level in milk fat of Simmental cows. Ten Simmental multiparous cows in mid lactation were used in change over design. Treatment was a basal diet (WSO) and basal diet supplemented with 2 % of high linoleic sunflower oil (SO) during the five week experimental period. The basal diet contained 26% of corn silage, 33% of perennial ryegrass haylage, and 41% of concentrate in DM. During the first experimental week the same basal diet was applied to all animals, with no significant difference in total blood cholesterol and C16:0 content in milk, but the average body condition score and C18:0 content in milk was statistically lower in the second group (3, 24 vs. 3, 07, and 9, 5 vs. 8, 88). In the second experimental week the body condition score and the C18:0 content in milk increased in SO group, with no detectable difference between group. The statistically higher total blood cholesterol was determined (6, 71 vs. 5, 00 in the fourth, and 6, 33 vs. 5, 07 in the fifth experimental week). The average body condition score decreased in WSO group in the fourth period and was significantly lower comparing to the SO group. The total blood cholesterol positively correlated with C18:0 in milk and C16:0 turn from positive to negative at the 5, 00 mmol/L of blood cholesterol. The results analysed with PROC MIXED procedure of SAS revealed significant increase of total blood cholesterol (4, 58 vs. 5, 58 mmol/L) with the sunflower oil treatment, while the body condition score did not change significantly. Unfavourable palmitic fatty acid content in milk was significantly reduced by the treatment (25, 14 vs. 29, 99%), and neutral stearic acid content was higher in SO comparing to WSO diet (15, 77 vs. 11, 49 %) but did not reach a significant level. We may conclude that sterol synthesis was increased by the sunflower treatment, indicating better energy level and at the same time decreasing critical level of palmitic fatty acid in milk, but probably higher dosage of oil might have caused a significant increase of stearic fatty acid and consequently oleic acid in milk.

Izvorni jezik
Engleski

Znanstvena područja
Veterinarska medicina, Prehrambena tehnologija

Napomena
Rad je prihvaćen i usmeno prezentiran na kongresu.

POVEZANOST RADA