Document Type: Original Article


Department of Animal Science, College of Agriculture, Isfahan University of Technology, Isfahan 84156-83111, Iran


For the current research the records of 62 farms in Isfahan province were available. To estimate genetic and phonotypic trends of reproductive traits such as age at first calving, calving interval, days open and number of insemination to conception rate the records of 63,866 cows including 167793 reproductive records were employed. Farms were covered by Vahdat industrial Agriculturists and Dairymen Cooperative of Isfahan during 1986 to 2012. Genetic parameters estimated by linear animal model using Restricted Maximum Likelihood Method (REML). Genetic and phonotype trends were estimated by using regression of average breeding values and phonotype values on calving year. Heritability of age at first calving (0.19±0.007), calving interval (0.06±0.005), days open (0.041±0.004) and number of insemination to conception (0.071±0.004) were estimated. Phonotypic trends of age at first calving, calving interval, days open, number of insemination to conception in first parity and number of insemination to conception in second parity onward were estimated to be -3.48± 1.08, -0.41±0.4, -0.42±0.2, 0.013±0.0025 and 0.031±0.01 respectively. Estimated genetic trends for age at first calving, calving interval, days open, for number of insemination to conception in first parity and number of insemination to conception in second parity onward were estimated to be 0.07±0.06, -0.56±0.5, -0.02±0.06, 0.0015±0.001 and 0.0005±0.005, respectively.


 Abdollahi-Arpanahi, F., H. Aliloo, H. Ghiasi and J. I. Urioste. 2013. Comparison of poisson ,probit and linear models for genetic analysis of number of inseminations to conception and success at first insemination in Iranian Holstein cows. J. Anim. Sci.153: 20-26.
 Ansari- Lari, M., M. Rezagholi and M. Reiszadeh. 2009. Trends in calving age and calving intervals for Iranian Holstain in Fars province, Southern Iran. Trop. Anim. Health.Prod. 41: 1283-1288.
 Deljoo-Isaloo, H. A and M. Pasha-Eskandari-Nasab. 2012. The estimationngenetic and environmental parameters and genetic and phenotype and genetic trend strad for reproduction traits of Holstein cows was Khoramdare Culture Technology. J. Anim. Sci. 92:52-58.
 Estrada- Leon, R. J., J. G. Magana and J. C. Segura Correa. 2008. Genetic parameter for reproductive trait of Brown Swiss cow in the tropice of Mexico. J. Anim. Vet. Adv. 7:124- 129.
 Faraji-Arough, H., A. A. Aslaminjad and H. Farhangfar. 2011. Estimation of genetic parameter and trends for age at first calving and calving interval in Iranian Holstein cows. J. Agri. Sci. 7: 79-87
 Ghavi Hossein-Zade, N. 2011. Estimation of genetic and phenotypic relationships between age at first calving and productive performance in Irainan Holstens. Trop. Anim.Health. Prod. 43:1-7.
 Gunawan, A., R. Sari, Y. Parwoto and M. J. Uddin. 2011. Non genetic factors effect on reproductive performance and preweaningmortality from artificially and naturally breed of Bali cattle J. Indonesian. Trop. Anim. Agric. 36:1-8.
 Hammoud, M. A., S. Z. EI-Zarkouny and E. Z. M. Oudah. 2010. Effect of sire, age at first calving, season and year of calving and parity on reproductive performance of Friesian cows under semiarid conditions in Egypt. Anim.Proc. 60-82.
 Haile, A., B. K. Joshi, W. Ayalew, A. Tegegne and A. Singh. 2009. Genetic evaluation of Ethiopian Boran cattle and theircrosses with Holstein Friesian in central Ethiopia: reproductive traits. J. Agric. Scie. 147: 81–89.
 Hare, E., H. D. Norman and J. R. Wright. 2006. Trend in calving ages and calving intervals for dairy cattel breed in the United States. J. Dairy. Sci. 89:365-370.
 Jensen, J. and P. Madsen. 2005. Calculation of standard errors of estimates ofgenetic parameters in DMU. Danish Institute of Agricultural Sciences, Tjele, Denmark.
 Mostert, R. B., R. R. Van der Westhuizen and H. E. Theron. 2010. Calving interval genetic parameters and trends for dairy breeds in South Africa.J. Anim. Sci. 40:156-162.
 Nilforooshan, M. A and M. A. Edriss. 2004. Effect of age at first calving on some productive and longevity traitsnin Iranian Holsteins of the Isfahan Province. Anim. Dariy. Sci. 87: 2130-2135.
 Nishida, A., M. A. Aziz, S. Nishida and K. Suzuki. 2006. Modelling number of services Per conception of Japanese Black cattle by random regression. J. Anim. Breed. Genet. 123: 56-63.
 Oseni, S., S. Tsuruta, I. Misztal and R. Rekaya. 2004. Genetic parameters for days open and pregnancy rates in US Holsteins using different editing criteria. J. Dairy. Sci. 87: 4327-4333.
 Shirmoradi, Z., A. R. Salehi, R. Pahlavan and M. R. Mollasalehi. 2010. Genetic parameters and Trend of production and reproduction traits in Iranian Holstein cattle. J. Anim.Procd. 12:21-28.