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Effect of flaxseed processing on milk production and the combination of fatty acids in milk of Holstein cows | ||
| علوم و فنون دامپروری | ||
| Article 5, Volume 8, Issue 32, December 2019, Pages 49-60 PDF (1.08 M) | ||
| Document Type: Research Paper | ||
| DOI: 10.22092/aasrj.2019.123376.1162 | ||
| Author | ||
| Mohammad Norouzi* | ||
| Animal Science department , Research center of khorasan Razavi | ||
| Abstract | ||
| This study was conducted to evaluate the effect of flaxseed processing on transition of polyunsaturated fatty acids to milk in Holstein dairy cattle. Twenty four dairy cows were assigned randomly into four treatments through a completely randomized design. The treatments were: control diet with cottonseed, diet with intact flaxseed, diet with grinded flaxseed and diet with extruded flaxseed. Adding intact or processed flaxseed in dairy cows diets had no significant effect on production and composition of milk and on proportion of short chain fatty acids. The mean concentrations of medium chain fatty acids (14 to 16 carbons) in milk of cows fed by grinded and extruded flaxseed were more than cows fed by intact flaxseed and control diet, significantly (41.73 and 45.02 vs. 47.15 and 48.49 gr in 100 gr of milk fat, respectively). Ratio of omega-6 to omega-3 fatty acids in milk fat of cows fed by intact, grinded and extruded flaxseed was lower than cows fed control diet, significantly (2.41, 2.20 and 2.18 vs. 3.90, respectively). The results showed flaxseed processing did not have a significant effect on the concentration of milk fatty acids, but in general, the use of flaxseed in the dairy cows’ diet could decrease the concentration of medium chain saturated fatty acids and increase the concentration of unsaturated fatty acids (especially omega-3) milk. | ||
| Keywords | ||
| Milk fatty acids; Grinded flaxseed; Extruded flaxseed; Holstein cow | ||
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