Efeito da suplementação de aminoácidos e cloreto de colina para dieta pobre em proteínas na eficiência de nitrogênio e emissão de metano de vacas leiteiras





Proteína bruta, Ambiental, Produção de gás, Metano, Retenção de nitrogênio, Ruminantes.


Os ruminantes são uma das maiores emissões antropogênicas de metano e óxido nitroso. Portanto, a hipótese foi estudar os efeitos da redução do nível de proteína bruta (PB) na dieta sobre os contaminantes ambientais quando aminoácidos protegidos no rúmen e cloreto de colina foram suplementados. Sessenta vacas leiteiras Holstein foram utilizadas durante o experimento. As dietas teste foram: (1) CD = dieta controle com 16.2 g de proteína bruta / Kg de MS); (2) LM = Dieta pobre em proteínas com 14.2 g de proteína bruta / Kg de DM + metionina; (3) LL = Dieta pobre em proteínas com 14.2 g de proteína bruta / Kg de MS + lisina; (4) LML = Dieta pobre em proteínas com 14.2 g de proteína bruta / Kg de DM + metionina + lisina; (5) LMLC = Dieta pobre em proteínas com 14.2 g de proteína bruta / Kg de DM + metionina + lisina + colina. O consumo de matéria seca e FDN não foi diferente, mas o grupo controle recebeu maior PB e FDA em comparação com os outros grupos (P < 0.05). A PB e FDA fecal do grupo controle foram menores (P < 0.05), mas não foram observadas diferenças para matéria seca (MS) e FDN fecal. A produção de leite e o teor de proteína foram maiores para LML e LMLC como grupo controle (P < 0.05). A ingestão de nitrogênio, N urinário, N urinário urinário e N excreta total diminuíram (P < 0.05) quando os animais foram alimentados com baixa proteína. Não houve diferença no pH ruminal e na relação acetato / propionato, enquanto o N-amônia ruminal diminuiu com o baixo teor de proteína (P < 0.05). O teste de produção de gás de 120 h, não mostrou diferença na cinética de digestão e emissão de metano in vitro. No entanto, a inclusão do CMS nos cálculos revelou que a baixa proteína pode reduzir (P < 0.05) a emissão de metano. No geral, nossos resultados indicaram que o baixo teor de proteína pode ser compensado pela adição de aminoácidos protegidos no rúmen, não apenas para manter o desempenho animal, mas também para diminuir a excreção de nitrogênio e a emissão de metano.


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Biografia do Autor

Shahram Shirmohammadi, Faculty of Agriculture, University of Tabriz

Student of Doctorial Course, Prof. Dr. of Department of Animal Sciences, Faculty of Agriculture, University of Tabriz, Tabriz, Iran.

Akbar Taghizadeh, Faculty of Agriculture, University of Tabriz

Student of Doctorial Course, Prof. Dr. of Department of Animal Sciences, Faculty of Agriculture, University of Tabriz, Tabriz, Iran.

Ali Hosseinkhani, Faculty of Agriculture, University of Tabriz

Student of Doctorial Course, Prof. Dr. of Department of Animal Sciences, Faculty of Agriculture, University of Tabriz, Tabriz, Iran.

Hossein Janmohammadi, Faculty of Agriculture, University of Tabriz

Student of Doctorial Course, Prof. Dr. of Department of Animal Sciences, Faculty of Agriculture, University of Tabriz, Tabriz, Iran.

Rasoul Pirmohammadi, Faculty of Agriculture, Urmia University

Department of Animal Science, Faculty of Agriculture, Urmia University, Urmia, Iran.

Hadi Valizadeh, Faculty of Pharmacy, Tabriz University of Medical Sciences

Department of Pharmaceutics, Faculty of Pharmacy, Tabriz University of Medical Sciences, Tabriz, Iran.


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Como Citar

Shirmohammadi, S., Taghizadeh, A., Hosseinkhani, A., Janmohammadi, H., Pirmohammadi, R., & Valizadeh, H. (2022). Efeito da suplementação de aminoácidos e cloreto de colina para dieta pobre em proteínas na eficiência de nitrogênio e emissão de metano de vacas leiteiras. Semina: Ciências Agrárias, 43(1), 159–178. https://doi.org/10.5433/1679-0359.2022v43n1p159




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