共 10 条
- [1] BUTCHER KR, 1973, THESIS N CAROLINA ST
- [2] BUTCHER KR, 1968, J DAIRY SCI, V51, P1387
- [5] EASTWOOD BR, 1968, DYS961 IOW STAT U DA
- [6] FLOCK DK, 1964, THESIS IOWA STAT U
- [7] FREEMAN MG, UNPUBLISHED PAPER
- [8] SYRSTAD O., 1971, Acta Agriculturae Scandinavica, V21, P50
- [10] Vinson WE, 1971, THESIS IOWA STATE U