ORIGINAL PAPER
Effect of diets with fruit oils supplements on rumen fermentation parameters, fatty acid composition and methane production in vitro
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1
Poznań University of Life Sciences, Department of Animal Nutrition and Feed Management, Wołyńska 33, 60-637 Poznań, Poland
2
Institute of Animal Physiology, Slovak Academy of Sciences Šoltésovej 4-6, 040 01 Košice, Slovakia
Publication date: 2013-03-19
Corresponding author
A. Cieślak
Poznań University of Life Sciences, Department of Animal Nutrition and Feed Management, Wołyńska 33, 60-637 Poznań, Poland
J. Anim. Feed Sci. 2013;22(1):26-34
KEYWORDS
ABSTRACT
Effects of diets supplemented with fruit seed oils on fermentation
parameters, ciliated protozoan population, and fatty acid composition of the rumen
fluid of dairy cows were studied in 24 h batch cultures. Two diets, one containing
lucerne plus wheat meal (60:40%) and the other containing of meadow hay plus
wheat meal (60:40%), were supplemented with either grape oil or black currant
oil (50 g · kg–1 of dry matter). The control diet contained no oil supplementation.
The oils were selected due to high content of linoleic acid (grape oil, 696 g · kg–1
of fatty acids; black currant oil, 586 g · kg–1 of fatty acids). Oil supplements did
not affect the basal parameters of rumen fermentation. Interactions between the
diets and oil supplements affected rumen methane production and either the
total or the majority of rumen ciliate species examined. Although the diets had no
effect on the total content of volatile fatty acids, the proportions of n-butyrate and
iso-valerate were significantly affected. The concentration of polyunsaturated
fatty acids was higher in the meadow hay diet than in the lucerne diet, whereas
addition of oils increased polyunsaturated fatty acids content. Black currant oil
supplementation proved to be more efficient in enhancing polyunsaturated fatty
acids content in rumen fluid when compared to grape oil. In conclusion, both oil
supplements considerably decreased methane production when lucerne was
used as the diet, what could be the effect of detrimental influence of the type
of diet and oil supplement on protozoa population. However, the supplements
did not negatively affect other rumen parameters, hence may be considered as
valuable supplements in ruminant nutrition.
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