Metabolizable energy of some feedstuffs for broiler chickens at different ages / Energia metabolizÃvel de alguns ingredientes para frangos de corte em diferentes idades

AUTOR(ES)
DATA DE PUBLICAÇÃO

2005

RESUMO

Six experiments were conducted in the Poultry Farming Sector of the Animal Science Department of the UFLA with the aim to determine the values of apparent metabolizable energy (EMA), corrected apparent energy (EMAn), true energy (EMV) and corrected true (EMVn) energy of some feedstuffs for broiler chickens at the Pre-Initial (1 to 7 days), Initial I (8 to 14 days), Initial II (15 to 21 days), growing I (22 to 28 days), growing II (29 to 35 days) and finish (36 to 42 days). Six hybrid corns, three soybean meals and one soybean oil were evaluated through the method of replacement of the reference diet for the feedstuffs under test. There was replacement of a part of the reference diet by 40% of the hybrid corn, 30% for soybean meals and 10% for soybean oil. 1994 male broiler chicks of âRossâ line of one day of age and average weight of 45.8 + 1,1g. were utilized. The number of birds per experimental unit was adjusted in each phase for adequacy of the metabolism cage stocking, its being that for each test feedstuff were utilized six replicates and simultaneously maintained further six replicates of fasting birds for determination of the endogenous and metabolic losses. The birds were given water and diet ad libitum during all the experimental period. The traditional method of total collection of excreta was used, where the birds were maintained in the metabolism cages during seven days, four days being for adaptation to the cage and feeding and three days for the excreta collection. The values of chemical composition of the feedstuffs were similar to those found in the literature. The energy values (EMA EMAn, EMV and EMVn) in general, were also similar to the ones found in the literature. Nevertheless, the energy values of the hybrid corns and were also inferior in the Pre-initial phase (1 to 7 days) relative to the others. Also, the values found for soybean oil and soybean meals had been increasing up to the Initial phase II (15 to 21 days). After this phase, the energy values observed for the feedstuffs were not influenced by the birdsâ age. It follows that the capacity of using the energy content of feedstuffs ranges with the birdsâ age.

ASSUNTO(S)

zootecnia composiÃÃo quÃmica broiler chickens nutriÃÃo de monogÃstricos monogastric nutrition frango de corte chemical composition energia metabolizÃvel metabolizable energy

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