1. Annual performance dairy reports covered by the technical unit of vahdat cooperative of Isfahan (1394) vahdat Cooperative farmers and animal farmers. Isfahan. pp. 161. (In Persian).
2. Beaudeau F, Seegers H, Ducrocq V, Fourichon C and Bareille N (2000) Effects of health disorders on culling in dairy cows: A reviewed critical discussion. Annals De Zootechnie. 49: 293-311.
3. Boden RF and Leaver JD (1994) A dual purpose cattle systemcombining milk and beef production. Animal Production. 5:8463- 464.
4. Cabrera V (2012) A simple formulation and solution to the replacement problem: A practical tool to assess the economic cow value, the value of a new pregnancy, and the cost of a pregnancy loss. Journal of Dairy Science. 95: 4683-4698.
5. De Haan MHA, Cassell BG and Pearson RE (1992) Relationships between net income, days of productive life, production and linear type traits in grade and registered Holsteins. Journal of Dairy Science. 75: 3553-3561.
6. De Vries A (2004) Economics of delayed replacement when cow performance is seasonal. Journal of Dairy Science. 87:2947-2958.
7. De Vries A (2006) Economic Value of Pregnancy in Dairy Cattle. Journal of Dairy Science. 89: 3876-3885.
8. De Vries A (2006) The DairyVIP program to evaluate the consequences of changes in herd management and prices on dairy farm [online]. Available at http://edis.ifas.uﬂ.edu. (Original publication date September 2006; Revised
January 2016). Animal Sciences Department, UF/IFAS Extension.
9. Dobson H, Smith R, Royal M, Knight C and Sheldon I (2007) The High producing Dairy Cow and its Reproductive Performance. Reproduction in Domestic Animals. 42: 17-23.
10. Fourichon C, Seegers H and Malher X (2000) Effect of disease on reproduction in the dairy cow: a meta-analysis. Theriogenology. 53: 1729-1759.
11. Laire FR and Cunningham EP (1980) Culling on low milk yield and its economic consequences for the dairy herd. Livestock Production Science.7:349-359.
12. Melendez P and Pinedo P (2007) The association between reproductive performance and milk yield in Chilean Holstein cattle. Journal of Dairy Science. 90: 184-192.
13. Plaizier J, Lissemore K, Kelton D and King G (1998) Evaluation of overall reproductive performance of dairy herds. Journal of Dairy Science. 81: 1848-1854.
14. Sadegi-Sefidmazgi A, Moradi-Shahrbabak M, Nejati-Javaremi A, Miraei-Ashtiani SR and Amer PR (2012) Breeding objective for Holstein dairy cattle in Iran. Journal of Dairy Science. 95: 3406-3418.
15. Sandoval-Castro CA, Anderson S and Leaver JD (2000) Production responses of tropical crossbred cattle to supplementary feeding and to different milking and restricted suckling regimes. Livestock Production Science. 66: 13-23.
16. Santos JEP, Thatcher WW, Chebel RC, Cerri RLA and Calva KN (2004) The effect of embryonic death rates in cattle on the efficacy of estrus synchronization programs. Animal Reproduction Science . 82-83: 513-535.
17. Smith JW, Ely LO and Chapa AM (2000) Effect of region herd size and milk production on reasons cow leave the herd. Journal of Dairy Science. 83: 2980-2987.
18. Strapak P, Candrak J and Aumann J (2005) Relationship between longevity and selected production, reproduction and type traits. Czech Journal of Animal Science. 50: 1-6.
19. Wathes DC, Bourne N, Brickell J, Swali A and Taylor VJ (2005) Relationship between production and reproduction. The 26th European Holstein and Red Holstein Conference, Prague 2005, Session 3.