共 11 条
- [1] BENESCH F, 1950, VETERINARY OBSTET ED
- [2] BROOKSBANK N. H., 1958, Veterinary Record, V70, P1148
- [3] DAVIDSON HR, 1953, PRODUCTION MARKETING
- [4] HAMMOND J, 1945, FERTILITY ANIMAL BRE
- [5] HUGGET ASG, 1950, MARSHALLS PHYSIOLOGY
- [6] JACKSON B. N., 1952, Veterinary Record, V64, P194
- [7] MURPHY T., 1958, Irish Veterinary Journal, V12, P51
- [8] PARKES AS, 1950, MARSHALLS PHYSIOL ED
- [9] PERRY J. S., 1954, Veterinary Record, V66, P706
- [10] SMITH WW, 1937, PORK PRODUCTION