The effect of autoclave processing and gamma irradiation on apparent ileal digestibility in male broiler breeders of amino acids from soybean meal.

The objective of this study was to investigate the effect of different doses of gamma irradiation and autoclaving on the apparent ileal digestibility in male broiler breeders of amino acid from soybean meal. This study had done in aviculture research institute of agriculture faculty of Islamic university Varamin branch in 2008. Samples were irradiated in a gamma cell at total doses of 15, 30 and 45 kGy. One package (control) was left at a room temperature: similar to other treatments, evaporation decreased the moisture content of the samples. Autoclaving of soybean meal for 15min at 121°c was studied. The treatment were: 1) control untreated soybean meal diet; 2) autoclaved soybean meal diet; 3) soybean meal diet gamma irradiated at a dose of 15 kGy; 4)soybean meal diet gamma irradiated at a dose of 30 kGy; 5) soybean meal diet gamma irradiated at a dose of 45 kGy. The results showed that autoclaving for 15min at 121°c had a statistically significant effect on the apparent ileal digestibility of the amino acids soybean meal (p<. 05). Autoclaving increased the apparent ileal digestibility of amino acids (CIAD) of soybean meal compared with untreated treatment (p<. 05).Gamma irradiation at dose of 15 and 30 kGy significantly increased CIAD of soybean meal (P<. 05).A dose of 45 kGy significantly decreased CIAD of individual amino acids of soybean meal except, valine, threonine, and glycine compared with untreated treatment (P>. 05). The results also showed that gamma irradiation of soybean meal were effective in denaturizing of protein and increasing the apparent digestibility of amino acids. In addition, autoclaving soybean meal for 15min at 121°c and 105 kpa increased the apparent digestibility of amino acids.Irradiation of soybean meal at 30 kGy improved the apparent digestibility of amino acids in comparison with the other processing methods.