Document Type : Research Paper
Assistant Professor, Faculty of Agriculture, Urmia University, Urmia, Iran
Professor, University College of Agriculture & Natural Recouces, University of Tehran, Karaj, Iran
Professor, Faculty of Agriculture, Urmia University, Urmia, Iran
Ph.D. Candidate, Faculty of Agriculture, Urmia University, Urmia, Iran
In this research encapsulated fish oil Ca-salts were produced by using a saturated FA containing material and evaluated. Nutrient content and FA profiles of produced supplements were determined and ruminal biohydrogenation and oil releasing were examined in vitro. Additionally, in a complementary in vivo experiment, effects of dietary inclusion of fish oil, ca-salts and encapsulated ca-salts on nutrient digestibility and ruminal paramerters were evaluated using three rumen fistulated Holstein cows. Encapsulation of Ca-Salts increased protection efficiency of PUFA against ruminal biohydrogenation. Encapsulated ca-salts with 10 % of wall material (weight basis) had lower biohydrogenation afer 48-h in vitro incubation (P˂ 0.05). Encapsulation of ca-salts decreased rumen oil release but oil release in other simulated media or total tract oil release were not affected by encapsulation (P˃ 0.05). Protected supplements increased nutrient digestibility compared with fish oil (P˂ 0.05). Non-encapsulated fish oil decreased acetate and rumen N-NH3 concentration as well as protozoa `population, but increased propionic acid concentration (P˂0.05). Encapsulation of Ca-Salt did not change rumen parameters (P˃ 0.05). According to the results, it can be concluded that encapsulation of ca-salts increased protection of PUFA against ruminal biohydrogenation without worse effects on rumen parameters. Encapsulation with 10 % of wall material (weight basis) can be presented as the best treatment according to chemical composition, fatty acid profiles, rumen biohydrogenation and oil release results.