Body measurements of Hy-Line silver brown commercial layer. (A). Anatomical structure showing linear body measurement traits taken in centimetres (cm), (B). Chicken showing body weight taken in kilograms (kg). BW, Body weight; WL, Wing Length; BK, Beak length; SL, Shank Length; BG, Body girth; BL, Body length.  

Heat map of correlation of body weight and body measurement traits of Hy-Line silver brown commercial layer. Pearson correlation colour illustration, a high correlation is red, mid correlation is white and low correlation is blue. Body weight: BW, Beak length: BK, Body length: BL, Body girth: BG, Shank length: SL, Wing length: WL, * significant at P < 0.05, ** significant at P < 0.01 and ns not significant. 

Graphical representation of the terms composing the MARS model for body weight using linear body measurement traits of Hy-Line silver brown commercial layer. (A) first order term of the predictor linear body measurement trait wing length (WL); (B) first order term of the predictor linear body measurement trait body length (BL); (C) second term order of the linear body measurement traits wing length (WL) and body length (BL); (D) second term order of the linear body measurement traits body length (BL) and beak length (BK).