Equações de predição dos valores energéticos de alimentos para aves

• Ano de defesa: 2009
• Autor(a) principal: Souza, Renata Mara de
• Orientador(a): Gomes, Paulo Cezar
• Banca de defesa: Rodrigues, Paulo Borges , Pinto, Rogerio
• Tipo de documento: Tese
• Tipo de acesso: Acesso aberto
• Idioma: por
• Instituição de defesa: Universidade Federal de Viçosa
• Programa de Pós-Graduação: Doutorado em Zootecnia
• Departamento: Genética e Melhoramento de Animais Domésticos; Nutrição e Alimentação Animal; Pastagens e Forragicul
• País: BR
• Palavras-chave em Português: Digestibilidade; Equação de predição; Energia metabolizável
• Palavras-chave em Inglês: Digestibility; Prediction equations; Metabolizable energy
• Área do conhecimento CNPq: CNPQ::CIENCIAS AGRARIAS::ZOOTECNIA::NUTRICAO E ALIMENTACAO ANIMAL
• Link de acesso: http://locus.ufv.br/handle/123456789/1723

Two experiments were carried out in the field in the Animal Science Department of the Universidade Federal de Viçosa (UFV), MG, Brazil with the objective of determine the apparent digestibility coefficients of the dry matter, of the crude protein, of the ethereal extract and of the nitrogen free extract of twenty foods for broilers chickens of different ages and adult cockerels. From the data of digestibility of nutrients, the chemical composition of foods and data corrected apparent metabolizable energy (AMEn), compiled of dissertations produced in the UFV evaluated with the same food, were obtained equations to predict the energy values of foods. Each experiment was composed by four assays with broilers chickens to 10-17, 26-33 and 40-47 days of age and adult cockerels. In the first experiment there were tested the feedstuffs corn, soybean meal, sorghum, wheat bran, rice meal, viscera meals 1 and 2, feathers meals 1 and 2 and blood plasma. In the second experiment, they were tested the feedstuffs soybean meal 45%, soybean meal 48%, extruded full-fat soybean, deactivated full-fat soybean, micronized full- fat soybean, deactivated soybean meal, soybean protein concentrate, corn gluten meal 21%, corn germ and rice broken. The coefficients of digestibility were used the method of total collection of excreted ones for determination. The method of total excreta collection was used, with male broiler chickens in the ages of 10-17, 26-33, 40-47 days and roosters were distributed in a randomized design with ten treatments and six replicates and eight, six and four birds per experimental unit, respectively. There were differences in digestibility coefficients in both experiments, with different behaviors in the age of birds for each food and nutrients. For the first experiment, the best equations to appreciate the AMEn of the feedstuffs of vegetable origin based on the chemical composition were AMEn = -8755,28 + 164,26 CP - 321,47 CF + 47,37 NDF + 151,76 EE (R² = 99%); AMEn = - 5192,32 + 113,20 CP - 157,34 CF + 81,00 EE + 282,36 ash + 85,69 starch (R² = 96%); AMEn = 5351,92 - 35,40 CP - 234,63 CF - 143,71 ADF - 138,03 EE + 321,33 ash (R² = 99%) and AMEn = 2488,81 - 230,13 CF + 191,93 ash + 19,17 starch (R² = 98%). For the feedstuffs of animal origin, the best equations determined from the chemical composition were: AMEn = 11053,3 - 69,93 CP - 41,99 EE - 255,80 ash (R²=94%); AMEn = -7184,50 + 112,91 CP + 113,33 EE + 118,90 ash (R² = 63%); 4600,32 - 15,32 CP + 27,13 EE (R² = 81%) and AMEn = 3064,16 + 62,81 EE ( R² = 84%). The best equations determined from digestible nutrients to foods of vegetable origin for the stages of 10-17, 26-33, 40-47 days with chickens and roosters were respectively: AMEn = 663,75 + 4,43 CPD - 106,99 EED + 39,10 ENND (R² = 67%); EMAn = - 14495,90 + 510,87 CPD + 458,69 EED + 162,88 NFED (R² = 58%);AMEn = 6230,63 + 270,89 CPD + 165,37 EED + 90,44 NFED (R² = 94%) and AMEn = -5117,63 + 27,74 CPD + 194,03 EED + 83,28 NFED (R² = 93%). For food of animal origin, no variable was significant in some equations from the digestible nutrients for the stages of 26-33 and 40-47 days for the chickens and roosters. The best equation determined from digestibility coefficients for the phase of the 10-17 days was: AMEn = 91,65 + 65,41CPD + 133,89 EED (R² = 96%). In the second experiment, the best equations to appreciate the AMEn for the phases of the 10-17, 26-33, 40-47 and roosters, respectively were: AMEn = 3836,04 - 9,35 CP - 29,21 ADF + 52,30 EE - 62,49 starch (R² = 99%); AMEn = 3199,76 - 19,53 ADF + 53,88 EE - 56,12 starch (R² = 98%); AMEn = 3266,74 - 29,31 ADF + 60,90 EE - 45,63 starch (R² = 95%) and AMEn = 2553,39 - 39,94 CF - 18,41 ADF + 20,80 NDF + 69,09 EE (R² = 98%). The best equations estimated from digestible nutrients for the stages of 10-17, 26-33, 40- 47 days of age of chickens and the roosters were, respectively: AMEn = 2395,52 + 72,07 EED (R² = 94%); AMEn = 1331,16 + 36,52 CPD + 85,29 EED (R² = 92%); AMEn = 377,16 + 55,23 CPD + 97,69 EED + 17,51 NFED (R² = 95%) and AMEn = 2048,18 + 20,32 CPD + 78,43 EED ( R² = 98%). A work was carried with the objective of determine equations to appreciate the values of metabolizable energy of some feedstuffs used in rations of broilers chickens, applying the meta-analysis principle, grouping and adjusting the data collected from studies realized in UFV in the last years. The data were catalogued and classified in energetic, proteins, proteins of vegetable origin and proteins of animal origin, completes and incompletes. The equations which best fitted to the completes and incompletes energetic feedstuffs were, respectively AMEn= 4393,93 - 40,78 CP - 112,23 ADF (R² = 84,37%) and AMEn = 3960,34 + 30,83 EE - 193,10 CF (R² = 77,24%). For the proteins completes foods of vegetable origin, the equation that had the best agreement was AMEn = 2780,64 60,70 EE - 15,35 NDF - 19,86 ADF (R² = 86,58 %). For the proteins incomplete foods the best equation was AMEn = 3034,13 + 53,00 EE - 85,66 Ash - 36,41 CF (R² = 78,20 %). The equation that had the best agreement for the proteins feedstuffs of animal origin was AMEn = 8034,50 + 38,71 EE - 52,46 CP -104,14 Ash (R² = 63%).