References
- Geldard , H. , Scaramuzzi , R. J. and Wilkins , J. F. 1984 . Immunization against polyandroalbumin leads to increase in lambing and tailing percentages . N. Z. Vet J. , 32 : 2 – 5 .
- Invermay Agricultural Research Centre Info. Sheet No. 3 . 1983 . Winter nutrition of ewes and development of the placenta and foetus