effect of in ovo feeding of different nutrients into yolk sac and 36 h starvation after hatch on hatchability, growth performance and few blood parameters of broiler chicks

this study was conducted to evaluate the effects of in ovo feeding of different nutrients on hatchability, initial weight after hatch, growth performance, blood parameters, immune organs and intestinal morphology of broiler chicks. the experiment was conducted in a completely randomized design with 5 treatments, 3 replicates and 16 fertile eggs from ross 308 breeders (28 week old) in each replicate. experimental treatments included: without injection (control) and injection of 0.7 ml of different nutrients into the yolk sac of fertile eggs on 14.5 d of incubation period, including: distilled water (sham), amino acids, dextrin 10% and dextrin 20%. chicks were fasted for 36 hours after hatch.the results showed that in ovo injection of amino acids can led to heavier birth weight, in compare to sham and control treatments. chicks hatched from eggs treated with dextrose 10% showed significantly the highest weight gain in 22- 42 d priod. also, at the same time, chicks hatched from egges injected with distilled water (sham) showed significantly the highest feed intake and fcr. blood glucose level after hatch were significantly lower in control and shame treatments than other treatment. blood cholesterol level was significantly lower in shame treatment. in ovo injection of dextrin 10% led to higher relative weight of thymus (at 7 d of age). also, the lowest relative weight of bursa at 42 d was for control treatment.jejunal villus highet in chicks aged 3 d was significantly higher for those hatched from eggs treated with dextrin 10%.in conclusion, it seems that in ovo injection of nutrients especially dextrin 10% and 20% can be helpful to improve the performance of broilers.