共 32 条
- [3] Barr A. J, 1976, USERS GUIDE SAS 76
- [4] BELLOWS RA, 1971, J ANIM SCI, V33, P407
- [5] CIRCULATING PLACENTAL LACTOGEN LEVELS IN DAIRY AND BEEF-CATTLE [J]. ENDOCRINOLOGY, 1976, 99 (05) : 1273 - 1278
- [6] INCIDENCE, REPEATABILITY AND EFFECT ON DAM PERFORMANCE OF TWINNING IN BRITISH FRIESIAN CATTLE [J]. ANIMAL PRODUCTION, 1970, 12 : 55 - &