Preliminary Toxicological Studies On 0, 0-diethyl, 0(2-isopropyl -6. Methyl - 4, Pyrimidinyl) Phosphorothioate (Diazinon) In Balami Sheep.

Toxicity studies of 0,0-diethyl-0-(2- isoprophyl-6-methyl-4-pyrimidinyl) phosphorothioate (DiazinonR) was carried out in the Balami breed of sheep. The agent was administered orally daily for one week at the rate of 20, 25 and 30mg/kg body weight to groups of sheep. The 30mg/kg dose produced transient clinical signs in the sheep. Diazinon inhibited plasma and red blood cell cholinesterase activity. The intensity of the inhibition was more with 30mg/kg dose and occurred as from day 3 and lasted till the end of the investigation 7 days post treatment. Leucocytosis was also observed with the 30mg/kg dose. There was no observable effect of the chemical on the RBC, Hb, and PCV values in sheep at the dosages used.