Survey of reproductive status in industrial dairy herds in Qazvin province

Document Type : (original research)

Authors

1 Department of Animal Science Research, Qazvin Agricultural and Natural Resources Research and Education Center, Animal Science Research Institute, Agricultural Research, Education and Extension Organization (AREEO), Qazvin, Iran

2 Qazvin Agricultural and Natural Resources Research and Education Center, Animal Science Research Institute, Agricultural Research, Education and Extension Organization (AREEO), Qazvin, Iran

3 Animal Science Research Institute, Agricultural Research, Education and Extension Organization (AREEO), Karaj, Iran

Abstract

The purpose of this study was to investigate reproductive parameters in industrial dairy herds in Qazvin province. To conduct this study Herds were categorized into five capacity categories of dairy cows including herds by capacity less than 100, 100-199, 200-499, 500-999 and more than 1000 heads, and the data were analyzed in a completely unbalanced randomized design. The results of this study showed that there was no significant difference among treatments in terms of mean day of first insemination after calving. The dose of sperm consumed per each pregnancy in heifers was significantly different among the different category of capacities. (P≤ 0.05), It was better than others in treatments 1 and 2 (1.23 and 1.40%, respectively). The open days in the studied herds were 144.55 ±14.57 days on average and there was no significant difference among different treatments. Although there was no significant difference among the herds in terms of cattle fertility but fertility of heifers differed significantly among different treatment groups (P≤ 0.05), and treatments 1 and 2 were better than other capacity categories. Mean dry days in herds were 75.91 ± 0.31 days but there was no difference between treatments. Abortion rate was significantly different among treatments and treatment 1 had the lowest abortion rate (P≤ 0.05).  The results of this study showed that in general with increasing capacity of dairy farms, the reproductive parameters are negatively affected and the incidence of abortion increases.  

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References

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Journal of Animal Environment
Volume 13, Issue 1
May 2021
Pages 53-60

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