Factors Influencing Antifungal Activity of Gentian Violet in Poultry Feed and Ingredients ,

Abstract

The inhibition of fungal activity in poultry feed and ingredients by gentian violet was investigated by measuring respiratory CO2 liberated into the headspace gas above samples of feed and ingredients. Inhibition by gentian violet depended on 1) the lot of corn meal, 2) the concentration of gentian violet, 3) the moisture of the substrate, 4) time of incubation, 5) particle sizes of corn meal and gentian violet, and 6) temperature of a short heating episode mimicking the feed-pelleting process. These same factors were reported earlier to control and limit the activity of organic acid mold inhibitors. These results imply that differences between gentian violet and other mold inhibitors used in poultry feed are quantitative rather than qualitative.

Possibilities for preventing mycotoxicosis in domestic fowl

“…Tabib et al (1984) reported that the onset of fungal activity in pellets containing mould inhibitors was delayed beyond that of the pelleted untreated material, or of treated mash. Tabib et al (1982) also showed that there might be a threshold dose which must be exceeded before any antifungal acivity is evident; and the activity of antifungal agents in feed is time-dependent.…”

Dyes as fungal inhibitors: effect on colony diameter

“…Various authors (18,19,26) have tested gentian violet for its inhibitory effect on the growth of aflatoxigenic strains. The use of this dye as a possible fungal inhibitor in poultry feed has also been reported (6,27). Chen and Day (6) studied the antifungal activity of this substance at various concentrations (5, 50, 500, and 5,000 ppm).…”