Composição química e valores de energia metabolizável de alimentos protéicos determinados com frangos de corte em diferentes idades

Abstract

RESUMO -Objetivou-se determinar a composição química e os valores de energia metabolizável de dez alimentos protéicos com frangos de corte em idades diferentes. Para determinar os valores de energia metabolizável aparente (EMA) e aparente corrigida (EMAn), utilizou-se o método tradicional de coleta total de excretas, com pintos de corte machos de 21 a 31 (primeiro período) e de 41 a 50 (segundo período) dias de idade, em um delineamento experimental inteiramente casualizado, com 10 tratamentos, seis repetições e seis e quatro aves por unidade experimental para o primeiro e o segundo período, respectivamente. Os alimentos estudados foram: farelo de algodão, farelo de glúten de milho, concentrado protéico de soja, duas farinhas de carne e ossos, farinha de peixe, farinha de vísceras de aves de alto teor de gordura, dois plasmas sangüíneos e hemácias. Os valores de EMAn (kcal/kg), na matéria natural, no primeiro e segundo períodos, foram, respectivamente, 1.963 e 2.461 para o farelo de algodão; 3.608 e 4.013 para o glúten de milho; 2.043 e 2.155 para o concentrado protéico de soja; 1.249 e 1.573 para a farinha de carne e ossos 36%; 1.391 e 1.766 para a farinha de carne e ossos 45%; 3.055 e 3.077 para a farinha de peixe; 2.990 e 3.172 para a farinha de vísceras de aves de alto teor de gordura; 2.673 e 2.730 para o plasma sangüíneo 70%; 3.027 e 3.704 para o plasma sangüíneo 78%; e 2.834 e 3.256 para as hemácias. Os valores de EMA e EMAn de todos os alimentos obtidos no segundo período experimental foram superiores aos do primeiro período.Palavras-chave: composição química, energia metabolizável, frangos de corte Chemical composition and metabolizable energy values of protein feedstuffs to broilers at different agesABSTRAT -The chemical composition and the metabolizable energy values of ten protein feedstuffs fed to broilers at different ages were evaluated. The traditional method of total feces collection was used to determine the values of apparent metabolizable energy (AME) and apparent metabolizable energy corrected by nitrogen (AMEn), in male broilers in the periods from 21 to 30 (first period) and from 41 to 50 (second period) days of age. The experiment was analyzed as a complete randomized design with 10 treatments, six replicates and six (first trial) and four poultry (second trial) per pen. The following feedstuffs were evaluated: cottonseed meal, corn gluten meal, soybean protein concentrate, two meat and bone meals, fish meal, full fat poultry by-product meal, two spray-dried plasma and erythrocytes. The AMEn (kcal/kg) values on as-fed basis in the first and second experimental periods were as follows: cottonseed meal, 1,963 and 2,461; corn gluten meal, 3,608 and 4,013; soybean protein concentrate, 2,043 and 2,155; meat and bone meal 36%, 1,249 and 1,573; meat and bone meal 45%, 1,391 and 1,766; fish meal, 3,055 and 3,077; full fat poultry by-product meal, 2,990 and 3,172; spray-dried plasma 70%, 2,673 and 2,730; spray-dried plasma 78%, 3,027 and 3,704; and erythrocytes, 2,834 and 3,256. All AME and AMEn ...

Chemical composition and apparent digestibility of the ostrich offal meal for Nile tilapia

“…It resulted in a greater proportion of protein in the product analyzed chemically, when compared to the lower values reported by other authors, like 46.72% of protein for chicken offal meal (NUNES et al, 2005) and 47.59% in the ostrich offal . Among the results presented, the fat resulted in a value close to that obtained by Souza et al (2000) and slightly lower than reported by Brumano et al (2006), for chicken offal. However, it should be highlighted the partial removal of fat during processing performed at laboratory scale, a method found to replace the pressing used in the industry.…”

Determination of true digestible amino acids of feedstuffs utilizing cecectomized roosters

“…Comparing the corn gluten meal evaluated in the present study with that evaluated by Brumano et al (2006), one can observe that only amino acid arginine presented inferior value, whereas the other amino acids presented higher values, except for histidine, which had the same value in the two studies. The non-essential amino acid content of the corn gluten meal assessed was superior to that found by Analyses conducted in the Animal Nutritional Laboratory Ajinomoto, extraction by HPLC.…”

Equations to Predict the Metabolizable Energy of Meat and Bone Meal for Growing Pigs

“…Brumano et al (2006) and Gomes et al (2007) noted the need to be cautious when using animal byproducts because of the low standardization of these products, which undergo variations in composition and the processing and the type and proportions of their constituents.…”