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Revista Brasileira de Zootecnia
Article . 2010 . Peer-reviewed
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Revista Brasileira de Zootecnia
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Balanço de nitrogênio em fêmeas leiteiras em confinamento alimentadas com concentrado à base de farelo de soja ou farelo de algodão

Authors: Santos, Stefanie Alvarenga; Campos, José Maurício de Souza; Valadares Filho, Sebastião de Campos; Oliveira, André Soares de; Souza, Shirley Motta de; Santiago, Alberto Magno Ferreira;

Balanço de nitrogênio em fêmeas leiteiras em confinamento alimentadas com concentrado à base de farelo de soja ou farelo de algodão

Abstract

Avaliou-se a influência do fornecimento de concentrados à base de farelo de soja ou farelo de algodão em dietas com silagem de milho sobre o balanço de nitrogênio e a produção de proteína microbiana em fêmeas leiteiras em crescimento. As dietas foram constituídas da combinação de dois níveis de concentrado (1 ou 2 kg) e duas fontes proteicas (farelo de soja ou farelo de algodão). Os animais que consumiram concentrado na quantidade de 2 kg/dia apresentaram maior consumo de nitrogênio total, entretanto não houve efeito significativo sobre o N-fecal, N-urinário e o balanço de nitrogênio. A interação entre o nível de concentrado e a fonte proteica influenciou o nitrogênio ureico na urina (N-urina), mas não alterou os níveis de nitrogênio ureico no plasma. Os níveis de concentrado e as fontes proteicas não afetaram as concentrações de purinas totais e alantoína na urina, a porcentagem de alantoína em relação às purinas totais, os níveis de ácido úrico na urina e nitrogênio microbiano nem a eficiência microbiana. O fornecimento de 1 ou 2 kg de concentrado contendo farelo de soja ou farelo de algodão como fontes proteicas para novilhas leiteiras em crescimento não afeta a eficiência microbiana, entretanto o fornecimento de 2 kg de concentrado aumenta a excreção de nitrogênio nas fezes.

Keywords

balanço de nitrogênio, dairy heifers, nitrogen balance, novilhas leiteiras, microbial protein, proteína microbiana, derivados de purina, purine derivatives

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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!
4
Average
Average
Average
Green
gold