Acute dermal toxicity study was conducted in rats. The parameters studied were body weight, serum biochemistry and gross pathology. The animals were also observed for clinical signs and mortality after the application of test film. The dermal irritation potential of silk protein film was examined using Draize test. In the initial test, three test patches were applied sequentially for 3 min, 1 and 4 hours, respectively, and skin reaction was graded. The irritant or negative response was confirmed using two additional animals, each with one patch, for an exposure period of 4 hours. The responses were scored at 1, 24, 48 and 72 hours after the patch removal. Skin sensitization study was conducted according to Buehler test in guinea pigs, in which on day 0, 7 and 14, the animals were exposed to test material for 6 hours (Induction phase) and on day 28, the animals were exposed for a period of 24 hours (Challenge phase). The skin was observed and recorded at 24 and 48 hours after the patch removal. In acute dermal toxicity study, the rats dermally treated with silk film did not show any abnormal clinical signs and the body weight, biochemical parameters and gross pathological observations were not significantly different from the control group. In acute dermal irritation study, the treated rabbits showed no signs of erythema, edema and eschar, and the scoring was given as “0” for all time points of observations according to Draize scoring system. In skin sensitization study, there were no skin reactions 24 and 48 hours after the removal of challenge patch, which was scored “0” based on Magnusson/Kligman grading scale.

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Necrotic enteritis is, however, a multifactorial event in which subclinical coccidiosis is believed to be one of the major predisposing factors along with high protein and high wheat composition in the diet. Hence present study was undertaken to know the changes in pathomorphological and biochemical parameters in experimentally induced necrotic enteritis in broiler chicken.

The ability of Diatomacious earth (DAE) in reducing the toxic effects of aflatoxin (AF) in broiler diet was evaluated. DAE was supplemented @ 400 and 800 mg kg -1 of feed along with 0.5 and 1 ppm of AF kg -1 of feed. Healthy unsexed day old broiler chicks (n=360) were assigned to 9 groups comprising of control and treatment groups. Feeding of AF resulted in significantly lower feed intake as well as body weight gain and increase in feed conversion ratio in comparison to the control groups. Supplementation of DAE in aflatoxin mixed diet significantly reduced the deleterious effects of AF on growth parameters. Feeding of AF alone caused significant decrease in serum levels of total proteins, albumin, triglycerides and cholesterol. However, significant increase was found in serum levels of AST, ALT, ALP, BUN and creatinine in AF fed broilers. Supplementation of DAE to the AF mixed feed ameliorated the adverse effect of AF on the serum biochemical values by causing increase in serum total proteins, albumin, triglycerides and cholesterol levels. In addition, a significant increase was recorded in AST, ALT, ALP, BUN and creatinine levels in DAE supplemented broilers. The study concluded that diatomaceous earth is an effective adsorbent to decrease the negative effects of aflatoxin in broiler chicken

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