Physical Body Deformity Effects on Differential Growth and Body Traits Development in Commercial Broilers

Physical deformities have been a recurrent challenge on broiler production in the tropics. The effect of physical body deformity (PBD) differential growth 550 commercial chicks Ross308 strain from day-old to 56 days were evaluated. Experimental design was completely randomized Design (CRD), while treatment groups normal birds (NB), crooked neck (CN), twisted Leg (TL) and neck+twisted leg (CN+TL). Data collected weight (BWT, g), drumstick length (DST, cm), wing (WGL, shank+toe (STL, cm) (LEL, cm); subjected General Linear model (GLM), α=0.05, regression Tukey’s Honestly Significant Difference (HSD) procedures Statistical Analytical Systems software, SAS® v8 (2008). depressed development significantly (P<0.05) with small large effects sizes (ds = -1.40 0.70). differences latent between significant (P<0.05), practical ( dS>0.5) (f 2>0.4) importance age 35 days. CN+TL group most by linear speed 0.43, quadratic late -0.19. Most adverse impact conditions spanned days, could lead rejection live at maturity low profitability flock enterprises tropics.
 Keywords: Commercial broilers, abnormalities, Growth development, Torticollis, Valgus-varus angulation