African Journal of
Agricultural Research

  • Abbreviation: Afr. J. Agric. Res.
  • Language: English
  • ISSN: 1991-637X
  • DOI: 10.5897/AJAR
  • Start Year: 2006
  • Published Articles: 6576

Full Length Research Paper

The changes of milk fatty acids profile and milk performances by using of whole sunflower oil seed (raw or treated) in lactating Holstein cow's diets

H. Mansoori1*, A. Aghazadeh2 and K. Nazeradl1
1Department of Animal Science, Islamic Azad University-Shabestar branch, Shabestar, Iran. 2Department of Animal Science, Urmia University, Urmia, Iran.
Email: [email protected]

  •  Accepted: 22 March 2011
  •  Published: 12 September 2011

Abstract

The objective of this study was to investigate the effects of dietary supplementation with sunflower oil seed (raw- or heat-treated) in two levels (7.5 or 15%) on UFA in milk fat and performances of high-yielding lactating cows. Twenty early lactating Holstein cows were used in a complete randomized design. Treatments included: 1) CON, control (without sunflower oil seed). 2) LS-UT, 7.5% raw sunflower oil seed. 3) LS-HT, 7.5% heat-treated sunflower oil seed. 4) HS-UT, 15% raw sunflower oil seed. 5) HS-HT, 15% heat-treated sunflower oil seed. Experimental period lasted for 4 weeks. Supplementation with 7.5% raw sunflower seed (LS-UT) tended to decrease milk yield, with 28.37 kg/d compared with the control (34.75 kg/d). Milk fat percentage was increased with the HS-UT that obtained 3.71% compared with CON that was 3.39% (P>0.05). Milk protein percent was decreased by 15% sunflower treatments with 3.18% whereas CON treatment caused 3.40%. The cows fed added LS-HT produced milk with the highest content of total UFA with 32.59 g/100g of milk fat compared with the HS-UT with 23.59 g/100 g of milk fat. Content of C18 UFA in milk fat increased from 21.68 in the HS-UT to 22.50, 23.98, 27.39 and 30.30 g/100 g of fat from the cow fed HS-HT, CON, LS-UT and LS-HT diets, respectively. C18:2 isomers of fatty acid were greater by LS-HT supplementation with significant effect (P<0.05). Total of C18 UFA content was significantly higher in milk of animal fed added 7.5% heat-treated sunflower. In all, results showed that diet cow's supplementation with sunflower oil seed tended to improve C18 UFA content in milk fat. It seems 7.5% heated sunflower oil seed can be the optimal source to increase UFA production and improve some milk performances.

 

Key words: Sunflower seed, milk production, fatty acid profile.