Resumo

OMOSEBI, D.J. et al. Effects of duration and level of feed restriction on performance and meat quality of broiler chickens. Arch. zootec. [online]. 2014, vol.63, n.244, pp.611-621. ISSN 1885-4494.  https://dx.doi.org/10.4321/S0004-05922014000400005.

Two hundred and sixteen unsexed 14 days-old Marshall broiler chicks were used in a 3x3 factorial experimental design to test the effect of restricting feed intake of birds by 0 %, 20 % and 40 % levels for 2, 4 and 6 weeks after two weeks of the starter phase. The unrestricted (control) treatments were fed ad libitum throughout the experiment. The experiment lasted for 42 days. data were collected and calculated on weight gain, feed:gain, feed intake, mortality, proximate composition of meat and cost-benefit analysis. Data obtained were subjected to a 2-way analysis of variance. results showed significantly higher (p<0.05) final weights in the unrestricted birds (control) compared to the restricted birds. interaction between duration of restriction and level of restriction indicated that weight gain and feed intake significantly (p<0.05) reduced as duration and level of feed restriction increased. Feed:gain was significantly (p<0.05) different across the treatments with birds restricted at 40 % for 6 weeks having the best feed:gain (1.91). The mortality recorded was not significant (p>0.05) across duration and level of restriction. Abdominal fat decreased with increasing duration and level of restriction with birds on 40 % level and 6 weeks duration of restriction having the lowest fat content (0.20 %). Crude protein content of the breast muscle significantly increased while crude fat content of the breast muscle significantly decreased with duration and level of restriction. Crude fat content was lowest at 40 % level and 6 weeks duration of feed restriction. As level and duration of feed restriction increased, feed cost/ kg reduced. Birds restricted at 40 % level for 2, 4 and 6 weeks durations respectively had better cost benefit than birds restricted at 0 and 20 % levels for 2, 4 and 6 weeks durations. It can be concluded that the best feed:gain, lower abdominal fat, higher protein and better cost benefit was achieved in birds restricted at 40 % for 6 weeks.

Palavras-chave : Abdominal fat; Marshall broilers; Cost benefit; Feed; gain ratio.

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