M. Szumacher-strabel, Microbial protein net synthesis in sheep fed meadow hay supplemented with different source and level of fat, J ANIM FEED, 7(4), 1998, pp. 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 1(st)
experiment, the addition of linseed oil (LSO) in the 2(nd), and tallow (TA
L) in the 3(rd) experiment. Treatments in all experiments were similar: a c
ontrol 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 syn
thesis, 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, wh
ereas 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.