Effect of dietary fish oil on milk yield, fatty acids content and serum metabolic profile in dairy cows
Robert Kupczyński , Marek Szołtysik , Witold Janeczek , Józefa Chrzanowska , Stefania Kinal , Bożena Króliczewska
AbstractThe aim of the study was to evaluate the effects of dietary unprotected fish oil on milk yield, fatty acids content and serum metabolic profile in dairy cows. Forty lactating Polish Holstein-Friesian cows were assigned to two groups. The cows were fed a control basal diet (C group), or a basal diet containing 2% addition of fish oil on mineral carrier (FOM group) during a 8-week period. Supplementing FOM diet of dairy cows had no significant effect on milk fat, milk protein, milk lactose concentration and somatic cells count, but increased the milk yield (36.5kg/d), (p<0.05) compared with the control cows (34.28kg/d). We observed an increase (p<0.05) in body condition scoring between C and FOM groups. Additionally, higher levels of non-esterified fatty acids and β-hydroxybutyrate acid were noticed in FOM group after 8weeks of the experiment; however, these serum parameters still were in the reference range. Concentration of insulin was higher (30.40μU/ml; p<0.01) in the FOM group compared with the control group (14.03μU/ml). In the FOM group, significant increase (p<0.01) in long-chain fatty acids, mainly cis-9, trans-11 CLA and n-3 fatty acids (eicosapentaenoic and docosahexaenoic acids) was observed. The obtained results demonstrated that addition of fish oil to cows' diet could profitably modify the fatty acids in cow's milk.
|Journal series||Journal of Animal Physiology and Animal Nutrition, ISSN 0931-2439, e-ISSN 1439-0396, (A 30 pkt)|
|Publication size in sheets||0.5|
|Keywords in English||Conjugated linoleic acid; Dairy cows; Fatty acids; Fish oil; Metabolism; Milk|
|Publication indicators||= 16; = 15; : 2011 = 0.739; : 2011 = 0.855 (2) - 2011=1.068 (5)|
|Citation count*||18 (2020-06-13)|
* presented citation count is obtained through Internet information analysis and it is close to the number calculated by the Publish or Perish system.