Microbial protein net synthesis in sheep fed meadow hay supplemented with different source and level of fat
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Department of Animal Nutrition and Feed Management, Poznań Agriculture University, Wołyńska 33, 60-637 Poznań, Poland
Publication date: 1998-10-22
J. Anim. Feed Sci. 1998;7(4):385-394
Three experiments were carried out on four rams fitted with rumen cannulas in a 4 x 4 Latin square design to investigate the effect of varying source and level of fat addition on microbial protein net synthesis (MN) in sheep fed meadow hay. The addition of rape seed oil (RSO) was tested in the 1st experiment, the addition of linseed oil (LSO) in the 2nd, and tallow (TAL) in the 3rd experiment. Treatments in all experiments were similar: a control group without added fat and experimental groups with 4, 8 and 10% of fat in DM of diet. The fat source did not affect microbial protein net synthesis, but addition of 8% of fat tended to increase MN. The highest level of all purine derivatives was observed when RSO was added to meadow hay, whereas tallow addition decreased level of all purine derivatives. The effect of fat was well demonstrated in the variation in pH, and the levels of NH3-N and volatile fatty acids.
Estimation of Microbial Protein Supply in Ruminants Using Urinary Purine Derivatives
X. Chen, E. Ørskov
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