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The purpose of this study is to investigate the effect of different feeding programs such as <i>ad libitum</i> feeding(AD), 20 % feed restriction based on <i>ad libitum</i> group (FR1) and not fed between 9 a.m. and 3 p.m. (FR2) ondeviation from bilateral symmetry or developmental stability in broiler chickens by means of two differentapproaches namely asymmetry measures and allometric growth model parameters. The weekly left and rightsides of shank length, shank width, wing length and face width of chickens were collected from 7 days ofage to 42 days of age. Results of this study showed that the deviations from the bilateral symmetry weremostly in fluctuating asymmetry (FA) in the FR1 group birds. On the other hand, the deviations from thebilateral symmetry in the birds in group AD and FR2 were mostly in the form of anti-symmetry (AS) anddirectional asymmetry (DA) respectively. In this study, the deviation from the bilateral symmetry wasmostly in FA type for the measured morphological characters for the FR1 group, and the FA level wasusually lower indicating higher welfare level and lower developmental instability for these animals than thatof the AD and FR2 groups. Allometric growth coefficients for evaluating the effects of the feeding programson the developmental stability were a little bit different from the findings obtained by the asymmetrymeasures‘ being taken into account. Allometric growth parameters, therefore, should be taken into consideration,along with asymmetry measures when investigating effect of rearing conditions or environmental conditionson developmental stability. As a conclusion, intensive feeding (AD) and long-term feed restriction (FR2) canbe said as an important environmental factor affecting developmental stability and dependently the animalwelfare and performance

archives animal breeding/archiv für tierzucht

Asymmetry measures and allometric growth parameter estimates for investigate effect of early feed restriction on deviation from bilateral symmetry in broiler chickens