Crop Biotech Update

Rat Feeding Tests Show Bt Rice is Safe

November 12, 2014

Bt rice (mfb-MH86) produces cry1Ab protein to reduce feeding damage of pests including Asiatic pink stem borer (Sesamia inferens), Asiatic rice borer (Chilo suppressalis), yellow stem borer (Tryporyza incertulas) and rice leafroller (Cnaphalocrocis medinalis). Huan Song of China Agricultural University and colleagues used rice flour from Bt rice and its non-biotech counterpart (MH86) for 90-days feeding test of Sprague-Dawley rats. The researchers separately formulated rodent diets at concentrations of 17.5, 35 and 70 % (w/w).

Overall health, body weight and food consumption were comparable between groups fed diets containing mfb-MH86 and MH86. Differences in haematological and biochemical parameters of the blood samples were noted, but still within the normal range of values for the size and gender of the rats, thus not considered as effect of the treatment. Macroscopic and tissue examinations were conducted, but no significant differences were found.

Based on the results, Bt rice mfb-MH86 is as safe and nutritious as non-GM rice.

Read the abstract at http://link.springer.com/article/10.1007/s11248-014-9844-6.