Profile Analysis and Growth Curve for Body Mass Index of Broiler Chickens Reared Under Different Feed Restrictions in Early Age

Abstract

Abstract. The purpose of this study is to investigate the effect of different feed restrictions which were applied in early period on change of Body Mass Index of Ross 308 broiler chickens. For this aim we used to two different statistical methods, namely Profile analysis and Growth curves. The daily body weight and weekly body length change of chickens was collected from 7 days of age to 42 days of age. Profile analysis was used to compare differences among the groups and the Gompertz growth function was regressed from these data to estimate the growth parameters. The group profiles were not found parallel in terms of Body Mass Index (P<0.001) as a result of the Profile analysis. Therefore once concludes that the difference in Body Mass Index (BMI) of the animals between weeks depends on feeding regime (profiles are not parallel). The value of A and b parameter values were 0.02368 and 0.83436 for ad libitum group (AD), 0.02216 and 0.75251 for 20 % feed restriction based on ad libitum group (YK), 0.02235 and 0.79656 for HG group, respectively. Inflection point (k) for HG group was fount smaller than that of the AD and YK groups. All parameter estimates and growth characteristics for chickens based on Gompertz growth model were significant (P<0.05).

Influence of feed form and energy concentration of the rearing phase diets on productivity, digestive tract development and body measurements of brown-egg laying hens fed diets varying in energy concentration from 17 to 46 wk of age

“…Body length, BMI and tarsus measurements are used to evaluate body composition and size and to predict future performance of broilers (Mendes et al, 2007;Van Roovert-Reijrink, 2013), pullets (Itza et al, 2011;Guzmán et al, 2015b) and laying hens (Ojedapo et al, 2012;Guzmán et al, 2016). Body length, BMI and length and diameter of the tarsus were not affected by dietary treatment, indicating that neither the characteristics of the rearing phase diets nor the energy content of the laying phase diets affected body size of the mature hens.…”

“…In addition, the length of the hens from the tip of the beak to the end of the longest phalanx was measured on a glass surface at 17 and 46 wk of age in extended birds, using a flexible tape with a precision of one mm. From these measurements, BMI was estimated by dividing the BW (g) of the hen by the corporal length 2 (cm) as indicated by Mendes et al (2007). Also, the length and diameter of the tarsus of these hens were measured with the aid of a digital caliper and expressed as cm per kg of BW.…”

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

“…This large appetite and some other negative raising and environmental conditions together may cause some problems such as low meat quality, acides, flipover syndrome, left-right sides differences of bilateral traits and some other health problems (SHAHIN and EL AZEEM, 2005;SHAHIN and EL AZEEM, 2006;MENDEŞ et al, 2007). One of the ways used to prevent these problems is the feed restriction programs applied in the early periods (PETER et al, 1997;BEYNI and HABI, 1998;GONZALES et al, 1998;SAVORY and LARIVIERE, 2000;TUMOVA et al, 2002).…”

Prediction of mono and multiphasic growth parameters of broilers (Short Communication)

“…Models commonly used to describe growth of poultry include such as Von Bertalanffy, Gompertz, logistic, or Richards functions assume that growth is a monophasic, continuous process resulting in a near symmetric, S-shaped curve (WELLOCKT et al 2004, ERSOY et al 2006, MENDEŞ et al 2007). However, in most animal species growth can be described by multiple S-shaped phases (multiphasic) due to seasonal fluctuations and differences in growth rates of body components (PIANTADOSI 1987).…”