Effect of mycotoxin on reproductive performance in dairy cattle [electronic resource].

Includes references.

The present study was determined the effect of combined mycotoxins caused by Aflatoxin and zearalenone exposure on reproductive performance and their relation to the incidence of ovarian cysts in dairy cattle. The present study used 28 lactating cows kept at dairy farm in Dakahlia governorate. Cows were classified into two groups First group (10 cows) were received ration where the percentage of aflatoxin and zearalenone not exceed permissible limit which is (5 ppb and 200 ppb respectively) and show normal estrous behavior and have mature large follicles >22mm<25mm in diameter and have corpus luteum. The second group (18 cows) received ration containing aflatoxin which found exceed permissible limit (19.7ppb) and zearalenone which was present at high levels (400 ppb), these cows exhibit"constant" estrus (nymphomania), excessive vaginal discharge, until day 45 postpartium and have ovarian cysts based on the presence of follicular structure (225 mm in diameter) with anovulation and the absence of corpus luteum. Blood samples was collected from each cow around 45 days postpartium for evaluation of serum progesterone (P 4), estrogen (E2), Luteinizing hormone (LH), triiodothyronine (T3), thyroxin (T4), prolactin (PRL) total protein, calcium, inorganic phosphorus, Liver enzymatic activities alanine aminotransferase (ALT) and aspartate aminotransferase (AST) immunologlobins (IgG, IgM, IgA).

Summary in Arabic.