Twenty four lactating Friesian cows were divided randor"ly into four similar
groups. Cows 01 the first group were fed on a control ration (R1) consisted of 50%
concentrate mixture (CM). 30% berseem hay (BH) and 20% rice straw (RS). tor the
other three groups (R2. R3 and R4) 33. 66 ane 100% of the berseem hay (BH) were
recteced by vegetable mar~p.t ng waste silagE ·:'vI.1WS). respectively. Resulls indicated that the contents of OM. CPo CF and ash decreased. while
OM, EE and NFE contents increased with increasing the level of VMWS in ranons.
The dige~:ion coefficients of OM, OM. EE and NFE (and consequently the TON value)
increased. while the digestion coefficients of CPo CF (and subsequenUy the DCP
value) decreased significantly (P rations. Average daily intakes ot OM, TON. CP and DCP decreased significantly as
the level of VMWS in the rations increased. Ruminal TVFA's, blood TJ and cortisol
concentrations and atkaline phosphatase activity increased, white rumina! pH value
and NH3·N, and blood total protein. albumin. globulin. urea and creatlnine
concentrations and activity of GOT and GPT decreased significantly (P Increasing the level of VMWS in the rations. The yield of aciuat milk, 4% tat corrected milk (FCM), tat. lactose and total
solids increased significantly (P and decreased afterwards. Fat and lactose contents increased, while protein. totaf
solids, solid not fat and ash contents of milk and the yield ot milk protein decreased
significanUy (P.05) with increasing the level o(VMWS in the rations. Yield of solid
not fat in milk of cows fed 100% VMWS (R4) was significantly lower (P<0.05)
compared (0 those fed R 1, R2 and R3 rations .. Daily teed cost decreased. and efficiency of energy and protein ulilization as
well as feed and economic eff)ciency increased significantly (P the level of Vr-mvS in the ralions. The Income of 4% FCM yield increased significantly
(P Blood analysis revealed normal hepatic function and level of hormone associated with
energy metabolism.