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.: Home > Animal Science Papers and Reports > 2015 > Volume 33 Number 4 > Adam Cieślak1 , Mohamed El-Sherbiny1,2, Joanna Szczechowiak1 , Dorota Kowalczyk1 , Emilia Pers-Kamczyc3 , Magdalena Bryszak1 , Paulina Szulc1 , Artur Jóźwik4 , Małgorzata Szumacher-Strabel1,**

Rapeseed and fish oil mixtures supplied at low dose can modulate milk fatty acid composition without affecting rumen fermentation and productive parameters in dairy cows

Adam Cieślak1 , Mohamed El-Sherbiny1,2, Joanna Szczechowiak1 , Dorota Kowalczyk1 , Emilia Pers-Kamczyc3 , Magdalena Bryszak1 , Paulina Szulc1 , Artur Jóźwik4 , Małgorzata Szumacher-Strabel1,**
1 Department of Animal Nutrition and Feed Management, Poznan University of Life Sciences, Wołyńska 33, 60‐637 Poznan, Poland 2 Department of Dairy Sciences, National Research Centre, 33 Bohouth St., Dokki, 12622 Giza, Egypt 3 Institute of Dendrology, Polish Academy of Sciences, Parkowa 5, 62-035 Kornik, Poland 4 Institute of Genetics and Animal Breeding, Polish Academy of Sciences, Jastrzębiec, 05-552 Magdalenka, Poland
Abstract :

The objective of this study was to supplement dairy cow diets with a mixture of rapeseed oil and fish oil at a low dose to modulate rumen and milk fatty acids without affecting other rumen fermentation and productive parameters. Our study was carried out on 14 lactating Polish Holstein-Friesian cows during their productive lives. One cow within each group was fitted with rumen cannulas. Animals were subjected to one of the treatments: 1) CON; total mixed ration (TMR) without oil supplementation, 2) FRM; consisting of TMR + 360 g/day/animal of rapeseed oil and fish oil in a 1:1 mixture. Milk production recorded throughout the experiment was not affected by oil mix supplementation; additionally, the whole tract digestibility did not differ when compared with the control group. No negative effects were also observed on the total rumen protozoan population, volatile fatty acids and *The study was conducted within the research project No. 2 P06Z 070 29 financed by the Polish Ministry of Science and Higher Education. **Corresponding author: mstrabel@up.poznan.pl 358 methanogens; however, total bacterial counts were slightly affected (P>0.05) after 3h of feeding as an immediate effect of oil mix addition, which later disappeared at 6 h post-feeding. Feeding dairy cows with rich sources of long chain polyunsaturated fatty acids at a low dose (360 g/day/animal) resulted in favourable changes in milk fatty acid content without affecting milk fat concentration. Milk from dairy cows fed a diet with oil supplement had more (P>0.05) C18:2 c9t11 and C18:2 t10c12, by 30% and 38%, respectively, when compared to the control group. In addition, the level of supplement used in our study increased the n-3 fatty acids proportion significantly when compared to the control diet. Hence, we can conclude that using 360 g/day/animal (about 1.8% of dry matter intake) positively influenced the milk fatty acid content without any adverse effect on cows’ productivity.

Keywords :
conjugated linoleic acid / fish oil / milk / rapeseed oil / unsaturated fatty acid

Date Deposited : 06 Jan 2016 10:13

Last Modified : 06 Jan 2016 10:13

Official URL: http://www.ighz.edu.pl/?p0=5&p1=34&o=7575

Volume 33, Number 4, October 2015 , ISSN 109-117

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