Fattening bulls on maize silage and concentrate supplemented with vegetable oils
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Research Institute of Animal Production, Department of Animal Nutrition, 32-083 Balice, Poland
The Kielanowski Institute of Animal Physiology and Nutrition, Polish Academy of Sciences, 05-110 Jabłonna, Poland
Research Institute of Animal Production, Experimental Station, 64-122 Pawłowice, Poland
The Agricultural University of Cracow, Department of Animal Breeding, Al. Mickiewicza 24/28, 30-059 Kraków, Poland
Publication date: 2001-04-20
J. Anim. Feed Sci. 2001;10(2):259-271
An experiment was carried out on 44 Black-and-White Lowland bulls allocated to 4 groups and fattened from 184 to 530 kg average body weight to investigate animal performance and meat quality when fed diets with balanced energy:protein ratio according to the INRA system. Diets consisted of maize silage and concentrate for the control group, supplemented with linseed, rapeseed oil cake, rape seed oil as additional fat sources for the experimental groups. Six animals from each group were slaughtered at the end of the experiment. The physical and chemical properties of meat, and its individual fatty acid and cholesterol contents were estimated. Average body weight gains of animals were similar in all groups reaching about 1.35 kg day-1. The fat content increased to about 5% in dry matter with about 50% fat from linseed or rapeseed oil cake, enriched the lipids of M. longissimus dorsi in essential and unsaturated fatty acids, conjugated linoleic acid and decreased the cholesterol level, which was particularly marked when feeding the diet supplemented with rapeseed oil cake. The highest ratio of hypocholesterolemic to hypercholesterolemic acids was also found in the meat of animals fed diet with rapeseed oil cake.
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