References
- Bass , J.J. , Peterson , A.J. , Payne , E. and Jarnet , M.P. 1977 . The effect of neonatal estrogen treatment on plasma hormone levels and behaviour in pre- and post-pubertal hulls . Theriogennlogy , 8 : 59 – 71 .
- Peterson , A.J. , Bass , J.J. and Byford , J.J. 1978 . Decreased plasma testosterone concentrations in rams affected by ryegrass staggers . Res. Vet. Sci. , 25 : 266 – 268 .
- Tervit , H.R. and Peterson , A.J. 1978 . Testosterone levels in Dorset and Romney rams and the effectiveness of these breeds in stimulating early onset of estrus in Romney ewes . Theriogenology , 9 : 271 – 277 .