Effect of dietary iodine supplementation on quality of cow's milk

To elucidate the influence of dietary iodine supplementation on quality of cow's milk 20 dairy Friesian cows were supplemented with potassium iodide for 7 weeks [at a dose of 0.2 mg/kg body weight] and another 20 Friesian cows, as a control group, were used. Milk samples were collected under aseptic conditions and subjected to chemical and bacteriological examination. The results indicated a significant increase in milk fat and protein percentage in iodine supplemented cows. On the other h and, the milk of control animals showed a significant increase in acidity percentage. Also, the methylene blue reduction time was much reduced than that of iodine supplemented cow's milk. Besides, a significant increase in both microbial counts and percentage of isolated microorganisms in milk of control animals than that of iodine supplemented ones. It can be concluded that, dietary iodine supplementation could be successfully used for improving milk quality

Organochlorine pesticide residues in tilapia species fish and the influence of thermal treatment and freezing storgement on their levels

Thirty fish samples of Tilapia species were collected randomly from Alexandria fish markets. The samples were screened for organochlorine pesticide [DDT, dieldrin and lindane] in fish muscles. The mean concentrations of DDT, dieldrin and lindane in fish muscles were 3.67 +/- 0.59, 0.17 +/- 0.03 and 0.75 +/- 0.21, respectively. No pesticide residues could be detected in positive samples after being exposed to heat treatment [roasting for 20 minutes and frying in oil for 15 minutes]. However, freezing for one month at -20C had slight significant effect on pesticide residues, while freezing storage for up to two months was sufficient for destruction of such residues in tested samples. The toxicity and public health significance of organochlorine pesticide were discussed