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Exigências Líquidas de Aminoácidos para Ganho de Peso de Nelores Não-Castrados

Authors: Silva, Fabiano Ferreira da; Valadares Filho, Sebastião de Campos; Ítavo, Luís Carlos Vinhas; Veloso, Cristina Mattos; Valadares, Rilene Ferreira Diniz; Cecon, Paulo Roberto; Moraes, Eduardo Henrique Bevitori Kling de; +1 Authors

Exigências Líquidas de Aminoácidos para Ganho de Peso de Nelores Não-Castrados

Abstract

Foram utilizados 40 novilhos Nelore inteiros, com peso vivo médio inicial de 240 kg, sendo quatro novilhos de referência, quatro alimentados para mantença e o restante distribuído em oito tratamentos, com quatro diferentes níveis de concentrado nas dietas (20; 40; 60 e 80%) e dois níveis de proteína bruta (PB) (15 e 18%). A fase de recria foi avaliada até 360 kg de peso vivo e a fase de engorda, até 450 kg de peso vivo. O volumoso utilizado foi feno de capim Tyfton (Cynodon dactylon). Após o abate, todas as partes do corpo do animal foram pesadas e amostradas. As amostras foram liofilizadas para determinação de matéria seca, pré-desengorduradas com éter e, posteriormente, moídas e determinados os teores de aminoácidos. As exigências líquidas de aminoácidos para ganho de peso foram calculadas segundo o método fatorial, no qual o ganho de proteína foi multiplicado pela composição aminoacídica do corpo vazio. A exigência líquida de aminoácidos para mantença foi estimada. A soma das exigências metabolizável para mantença e ganho compôs a exigência total de aminoácidos metabolizáveis. As exigências líquidas para ganho de aminoácidos diminuíram com o aumento do peso vivo do animal. A exigência total de aminoácidos metabolizáveis, expressos em % do total de aminoácidos essenciais, não variou muito com o aumento do peso vivo, obtendo-se valores médios de 2,66; 15,11; 6,09; 8,64; 9,26; 18,48; 8,33; 12,01; e 19,41 para metionina, lisina, histidina, fenilalanina, treonina, leucina, isoleucina, valina e arginina, respectivamente.

Keywords

amino acids, Nellore, Nelore, aminoácidos, exigências, SF1-1100, needs, Animal culture

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citations
This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Citations provided by BIP!
popularity
This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.
BIP!Popularity provided by BIP!
influence
This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Influence provided by BIP!
impulse
This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.
BIP!Impulse provided by BIP!
5
Average
Average
Average
Green
gold