| Abstract: | The basic feeds hay, grass silage and corn silage out of 70 dairy farms were investigated for the correct evaluation of their concentration of raw protein (RP) and gross energy (NEL) lactation. Three different kinds of rations were grouped: type A (estimated feed mass, table data contents), type B (weighed feed mass, table data contents), type C (weighed feed mass, analysed contents). Concerning gross energy lactation significant differences between C and A and C and B could be detected. Calculations of the expected milk yield (Milk Yield Potential, MYP) out of gross energy lactation and of raw protein were carried through and compared, using each, analysis data and table standards. MYP out of raw protein in basic feeds significantly exceeds the possible milk yield out of gross energy concentration, referring to table standards and analysis data as well. Raw protein-MYP of analysed data was significantly higher than of table standards, whereas gross energy MYP calculated with analysed data did not agree with table standards. |
