References
- Catchpole , H. R. 1969 . “ Hormonal mechanisms during pregnancy and parturition ” . In Reproduction in Domestic Animals , 2nd ed. , Edited by: Cole , H. H. and Cupps , P. T. 415 – 415 . N.Y. & London : Academic Press . In
- Hotson , I. K. 1967 . Ostertagiasis in cattle . Aust. vet. J. , 43 : 383 – 387 .
- Pope , G. S. , Jones , H. E. H. and Waynforth , H. B. 1965 . Oestrogens in the blood of the cow . J. Endocrin. , 33 : 385 – 395 .
- Salisbury , J. R. and Arundel , J. H. 1970 . The relationship between lactation and post-parturient rise in faecal egg counts of ewes . Aust. vet. J. , 46 : 267 – 271 .