Author(s): Aida Sayad, Mohammad Abdollahi, Mehdi Vodjgani, Khosrou Abdi, Faramarz Gharagozloo, Mohammad Amin Rezvanfar, Hesameddin Akbarein, Mohammad Kazem Koohi
Ovarian cyst is a common disease affecting dairy cows. It is one of the major causes of infertility in dairy cattle. Pathological ovarian cysts are classified into two groups including follicular and luteal cysts. Due to reduced fertility, increased calving interval, and the increase in the culling of cattle as a result of infertility, livestock industry has suffered from abundant financial losses. Hormonal and endocrine disorders are the causes of this disease that may occur through endocrine disrupting pesticides. This study aimed to investigate the relationship between plasma levels of diazinon and malathion with follicular cysts in dairy cattle. A case-control study was conducted on 30 cows. Diagnosis and selection of 15 cows (as the case group) with follicular cysts were done via rectal touch and ultrasonography, and plasma progesterone level was measured by a specialist. Control group consisted of 15 healthy cows that were homogenized with case group. Blood samples were taken from tail vein and were centrifuged, and the plasma was separated and stored at -80° C. Malathion and diazinon pesticides were measured by GC-MS (Gas Chromatography Mass) method in the plasma of the samples with 30ppb resolution. Independent t-test was used for comparing the means in healthy and case independent groups. P <0.05 was considered significant. SPSS 20 was used for statistical analysis. Plasma levels of both pesticides were very low and below the acceptable threshold for GC Mass method used in this study. Since neither of the two toxins was identified in the plasma of healthy nor case groups and no statistically significant difference was observed between the two groups (P>0.05), it can be stated that there is no correlation between diazinon and malathion pesticides, and the risk of follicular cysts in dairy cows.
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