| 000 | 00425 a2200133 4500 | ||
|---|---|---|---|
| 100 | 1 | _aHeady, E.O. | |
| 245 | 1 | _aMilk production functions, hay/grain substitution rates and economic optima in dairy cow rations | |
| 260 |
_aAmes _c1956 |
||
| 300 | _a895-932 p. | ||
| 440 | _aIowa Agricultural Experiment Station. Research Bulletin No. 444 | ||
| 650 | _aMilk, Production, Economic, Dairy | ||
| 942 |
_2udc _cB |
||
| 901 | _a52132 | ||
| 999 |
_c55758 _d55758 |
||