تاثیر تغذیه زودهنگام زرده تخم‌مرغ و روغن سویا بر عملکرد و ریخت‌شناسی روده جوجه‌های گوشتی

This experiment was conducted to investigate the effects of egg yolk and soybean oil as early feeding to broiler chicks on growth performance and intestinal morphology. A number of 525 chicks (Ross 308) were allocated to 7 treatments with 5 replicates and 15 birds in each replicate in a completely randomized design. Treatments were: control group (without early feeding), and feeding of 0.4 and 0.8cc of egg yolk, soybean oil and water as force-feeding after incubation. All chickens then were fed with the same rations for 21 days. At the end of the study, two birds of each repilcate were slughtered for jujenum sampling to conduct the mophological trial. Feed intake and weight gain were recorded weekly. Results showed that growth performance of chickens was affected by the treatments only in the first week of rearing (p<0.05), where the chicks were early-fed twice by egg yolk (0.8cc) had the lowest feed intake and feed conversion ratio. Mophological parameters of jujenum samples were affected by treatments with the different severity where the chickens fed twice with egg yolk (0.8cc) had the highest heighth, width and surface of villi as well as villi height to crypts depth than other groups (p<0.05). Sub-mucusal layer and muscle widths were also higher in chickens fed twice with egg yolk. Generally, results of the study showed that feeding of chicks twice with egg yolk as a early feeding can improve growth indices of small intestine villi and also feed conversion ratio during the first week of rearing period.