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    Body mass index slopes of growth and fat content under different feed restrictions in broiler chickens
    (Eugen Ulmer Gmbh Co, 2008) Mendes, M.; Pala, A.; Dincer, E.
    Major purpose of this study was to investigate the differences between three feeding regimes, namely ad libitum (AD), %20 restricted feeding based on ad libitum (RF) and fasting between 09.00 AM and 15.00 PM (NF), for Body Mass Index (BMI) and weight slopes and for percent fat content in broiler chickens. The data was collected from 60 Ross 308 line male and female chickens. BMI and weight slopes were calculated for each bird and were analyzed as data using ordinary least squares in addition to repeated measures analysis for acidity, dry matter and fat percent. The regression coefficient of first week BMI values on slopes was -0.276 +/- 0.023 (P<0.001). The AD group had the steepest slopes followed by RF and the NF group when the slopes were calculated using BMI values (P<0.01) or when the slopes were calculated using weight (P<0.01). The regression coefficient of first week weight on the slopes was 0.602 +/- 0.267 (P=0.024) and that of first week's BMI on weight slopes was -5.58 +/- 3.5 (P=0.679). Differences between breast and rump were significant in acidity and dry matter (P=0.00). Overall, the AD group meat had more fat percentage compared to the other groups and the differences were significant (P<0.05). These suggest that heavy animals tend to have higher BMI values and fat percentage, especially with ad libitum feeding.
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    Effects of drinking water differing in dissolved oxygen concentration on growth performance of broiler
    (Eugen Ulmer Gmbh Co, 2007) Dincer, E.; Karabayir, A.; Mendes, M.
    The objective of this study was to adapt the Gompertz function to growth data of chickens to testing the effects of oxygen-enriched drinking water on growth performance of Ross 308 broilers. Daily body weight change of chickens was determined from seven days of age to 49 days of age. Two treatment groups were included: control (5.50 mg/l dissolved oxygen), treatment (13.85 mg/l dissolved oxygen). The effect of oxygen-enriched drinking water on growth performance of chickens was determined by repeated measures analysis of variance. Gompertz growth function was applied to estimate growth parameters such as mature weight, growth rate and the age (days) at maximum daily weight gain of males and females for each group. Repeated measures analysis of variance showed a significant day x sex interaction effect (P=0.000). Tukey multiple comparison test revealed no difference between sex in the first 15 days (P=O. 196). However, live weight of males form day 16 onward started to differ from the live weight of females (P=0.039). Though feed conversion efficiencies of the two groups were similar, feed conversion efficiency of the treatment group was slightly better than that of the control group especially in weeks 3, 4 and 5. The Gompertz growth model fitted to chicken weight and age data very well with R-2>98%. Mature weight of females of treatment group (4,841 g +/- 93.4) was higher than of control group (4,348 g +/- 82.3). However, growth rate of females for treatment and control groups were same (0.46). Females in treatment group (27.7 d +/- 0.46) attained the maximum growth one day earlier than those in control group (28.8 d +/- 0.44). Mature weight (6,604 g +/- 175) of males of treatment group was higher than that (6,526 g +/- 149) of males of control group. Growth rate and age (days) at maximum daily weight gain of males were similar for both groups.