Comparison of reproductive performance of Seminal-Holstein cows with Holstein in Golestan province

Abstract

Introduction: The aim of this study were carried out to compare reproduction performance
of pure Holstein and crossbreds of Holestein-Simmental (50H:50S and 25H:75S) that kept
in one farm located in Golstan Province.
Materials & Methods: Reproductive parameters including age of first insemination, age
of first calving, gestation length, open days, calving interval and calf birth weight were
studied.
Results: The Pure Holstein and Holestein- Simmental (50H:50S and 25H:75S) were not
different for age at first insemination and age at first calving. The open days had significant
influence on Pure breed Holstein and Holestein- Simmental (50H:50S) during the first and
third lactation. In this study, the calving distance between pure Holstein breeds and
Holstein-Seminal crossbred was significant with a ratio of 50H:50S in the first and second
lactation (p<0.05). Calf birth weight in pure Holstein breed (41.228 and 43.787 Kg) were
more than Holestein- Simmental crossbred (50H:50S), (40.32 and 41.107 Kg) during the
first and second lactation and that was in Holestein- Simmental crossbred (50H:50S), (40.32
Kg) more than Holestein- Simmental crossbred (25H:75S), (36.6 Kg) but there was no
significant difference between them.
Conclusion: The results of this study indicate that the reproductive performance of
Holestein- Simmental crossbred for open days and calving interval and the age of the first
inoculation of Seminal-Holstein crossbred with a ratio of 25H:75S were better than Pure
Holstein.