References
- Leaver , J. D. . Optimal age at first calving . Paper presented at the 28th Annual Meeting of the European Association of Animal Production (EAAP) . pp. 4 Brussels
- Miller , P. , Van Vleck , L. D. and Henderson , C. R. 1967 . Relationships among herd life, milk production, and calving interval . J. Dairy Sci. , 50 : 1283 – 1287 .
- Remer , Y. . Economic evaluation of early breeding of dairy cattle heifers under farm conditions in Israel . Paper presented at the 20th Meeting of the International Committee for Recording the Productivity of Milk Animals (ICRPMA) . pp. 5 München