Quantitative feed restriction from 35 to 42 days of age for broiler chickens

Restrição alimentar quantitativa dos 35 aos 42 dias de idade para frangos de corte

Abstracts

The objective of this study was to evaluate the effect of increasing levels of feed restriction in broilers aged from 35 to 42 days, on the performance, carcass parameters and intensity of lesions at slaughter. A total of 1,225 one-day old chicks were obtained from a commercial hatchery and were grown over a 34-days period (five weeks). At 34 days of age all birds were weighed and redistributed into a completely randomized design to perform the following treatments: control (0% feed restriction), 10, 20, 30 or 40% feed restriction. The amount of feed given to animals was adjusted daily according to the previous day's intake of the control treatment. At 42 days, birds were weighed and two birds per pen were slaughtered, one to evaluate carcass yield and cuts and the other for body composition analysis. Weight gain and feed intake were decreased linearly (p<0.05) according to increasing levels of restriction, while the feed:gain ratio showed a quadratic effect (p<0.05). The hot eviscerated carcass weight decreased linearly (p<0.05) according to increasing levels of restriction, without effects on the carcass, breast and thigh yield. The dry matter and fat of the carcass decreased and the crude protein increased (p<0.05), according to levels of restriction. We conclude that feed restriction of 2.5% in the last week of life can improve the feed efficiency of poultry, when there is a higher accumulation of fat in the carcass.

body composition of chickens; carcass yield; feed management

O objetivo deste trabalho foi avaliar o efeito de níveis crescentes de restrição alimentar dos 35 aos 42 dias de idade de frangos de corte sobre o desempenho, características de carcaça e intensidade de lesões na carcaça no momento do abate. Um total de 1225 pintainhos de um dia de idade foram alojados aleatoriamente em boxes e alimentados ad libitum por 5 semanas. Aos 34 dias de idade as aves foram pesadas e redistribuídas em um delineamento inteiramente aleatorizado e submetidas a 0 (controle), 10, 20, 30 ou 40% de restrição alimentar. A quantidade de ração fornecida aos animais foi ajustada diariamente, de acordo com o consumo do tratamento controle. Aos 42 dias as aves avaliou-se o rendimento de carcaça e cortes, além da composição bromatológica corporal. Houve efeito linear decrescente sobre o ganho de peso e o consumo de ração (p<0,05) de acordo com os tratamentos, enquanto que sobre a conversão alimentar houve efeito quadrático (p<0,05). O peso da carcaça eviscerada quente diminuiu linearmente (p<0,05) de acordo com o aumento dos níveis de restrição, sem afetar o rendimento de carcaça e peito. Com relação aos dados de composição da carcaça verificou-se que a matéria seca e a gordura da carcaça decresceram enquanto que a proteína bruta aumentou (p<0,05). Conclui-se que o nível de 2,5% de restrição é capaz de melhorar a eficiência alimentar das aves na última semana de criação, período em que tem-se maior acúmulo de gordura na carcaça.

composição corporal de frangos; manejo alimentar; rendimento de carcaça

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Publication Dates

• Publication in this collection
  02 Feb 2015
• Date of issue
  Dec 2013

History

• Received
  10 May 2013
• Accepted
  22 Dec 2013