The effect of gamma irradiation on apparent ileal amino acids digestibility of soybean meal in male broiler breeder

The objective of this study was to investigate the effect of different doses of Gamma irradiation on the apparent ileal digestibility in male broiler breeders of amino acid from soybean meal. 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. The treatment were: 1) control untreated soybean meal diet; 2) soybean meal diet gamma irradiated at a dose of 15 KGY; 3)soybean meal diet gamma irradiated at a dose of 30 KGY; 4) soybean meal diet gamma irradiated at a dose of 45 KGY. The results showed that Gamma irradiation at dose of 15 and 30 KGY significantly increased CIAD of soybean meal (P< 0.05).A dose of 45 KGY significantly decreased CIAD of individual amino acids of soybean meal except methionine, histidin, valine, threonine, tyrosine and glycine compared with untreated treatment (P> 0.05). 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.