The aim of the report was to present the circulation of BVDV (bovine viral diarrhea virus) in the cattle population and determine the cause of the failure of vaccination failure leading to the birth of the PI (persistently infected) calf. The case study was carried out at the BVDV-free animal breeding center and cattle farm. where the vaccination program against BVDV was implemented i... https://parisnaturalfoodes.shop/product-category/pro-l-threonate-144mg/