References
- Anon. N.Z. Dairy Production and Marketing Board. Farm Production Report and Survey of Board's Work. 1962 38 55 59
- Anon. N.Z. Dairy Production and Marketing Board. Farm Production Report and Survey of Board's Work. 1963 39 61 69
- Anon. N.Z. Dairy Board, Farm Production Division, 47th Farm Production Report 1971 73
- Buch , N. C. , Tyler , W. J. and Casida , L. E. 1955 . Postpartum oestrus and involution of the uterus in an experimental herd of Holstein-Friesian Cows . J. Dairy Sci. , 38 : 73 – 79 .
- Saiduddin , S. , Riesen , J. E. , Tyler , W. J. and Casida , L. E. 1968 . Relation of postpartum interval to pituitary ovarian follicular development and fertility in dairy cows. In Studies on the Postpartum Cow . Univ. Wisconsin Res. Bull. , 270 : 15 – 22 .