References
- Bellows , R. A. 1973 . Factors affecting losses at calving , 69 – 84 . Colorado State University, Animal Production Laboratory . No. 1-1
- Bull , G. 1970 . Grass Staggers Report. N.Z. Dept. of Agriculture Report ,
- Casida , L. E. , Hauser , E. R. and Tybr , W. J. 1968 . Studies on the post-partum cow . Wsc. Agr. Exp. Sta. Bulletin , 270 : 1 – 10 .
- Cundiff , L. V. 1973 . The effects of heterosis in Hereford. Angus and Shorthorn cattle . U.S. Meat Animal Research Centre Progress Report , : 11 – 27 .
- Dickerson , G. E. , Kunzi , N. , Cundiff , L. V. , Kock , R. M. , Anhand , V. H. and Gregory , K. E. 1974 . Selection criteria for efficient beef production . J. An. Science , 39 : 659 – 673 .
- Fielden , E. D. and McParlane , D. 1959 . “ Some aspects of the Gisbome beef cattle fertility survey ” . In Sheep Farming Annual 1959 , 29 – 39 . Palmerston North : Massey Agric College .
- Laster , D. B. 1973 . Factors affecting calving difficulty . U.S. Meat Animal Research Centre Progress Report , : 36 – 46 .
- Laster , D. B. , Smith , G. M. and Gregory , K. E. 1976 . Characterization of Biological types of cattle IV. Post weaning growth and puberty of heifers . J. An. Sci. , 43 ( 1 ) : 63 – 70 .
- Long , G. R. 1973 . Preweaning comparison of Hereford Angus and reciprocal cross calves . U.S. Meat Animal Research Centre Progress Report , : 28 – 35 .
- Long , G. R. , Cartwright , T. C and Fitzhugh , H. A. 1975 . Systems analysis of sources of genetic and environmental variation In efficient beef production Cow size and herd management . J. An. Sci , 50 : 409 – 420 .
- Pattutlo , D. A. 1973 . Perinatal deaths of calves born to heifers mated as yearlings . Aust. vet. J. , 49 : 427 – 432 .
- Reynolds , W. L. 1973 . Genetic effects on fertility in beef cattle , 8 – 18 . Colorado Slate University, Animal Production Laboratory . No. 1-1
- Swan , H. 1975 . What price size in beef cattle . Livestock International , 8 : 30 – 32 .
- Wiltbank , J. N. 1973a . Reproductive patterns in Beef cattle , 1 – 7 . Colorado State University, Animal Production Laboratory . No. 1-1
- Wiltbank , J. N. 1973b . Postpartum Oestrus and conception rates , 40 – 48 . Colorado State University. Animal Production Laboratory . No. 1-1
- Wiltbank , J. N. 1973c . Puberty the effect of breed and feed. Reproduction in Beef Cattle Course , 73 – 80 . Massey University .
- Young , J. S. 1965 . Infertility in range cattle . N.Z. vet.J. , 13 : 1 – 9 .
- Young , J. S. 1967 . Some observations on productive performance in selected commercial beef herds . N.Z. vet.J. , 15 : 167 – 173 .