Fósforo digestível de ingredientes para aves: metodologias e atualidades
DOI:
https://doi.org/10.33448/rsd-v9i7.4543Palavras-chave:
Digestibilidade; Método direto; Método de regressão; Método de substituiçãoResumo
O fósforo é o segundo mineral mais abundante nas aves, e o excesso ou a deficiência pode elevar à susceptibilidade a doenças do desenvolvimento ósseo. Na atualidade, nutricionistas têm buscado maneiras de atender precisamente as exigências dos animais, bem como de conhecer a disponibilidade nos ingredientes usados nas rações, objetivando o uso eficiente deste mineral. A digestibilidade pré-cecal foi proposta como a medida mais próxima do que seria o fósforo disponível para as aves. A metodologia utilizada foi a de revisão narrativa, com consulta a documentos publicados em diferentes bases de dados visando descrever e discutir as metodologias aplicadas para a determinação da digestibilidade pré-cecal de fósforo em ingredientes para aves. Os métodos comumente utilizados na determinação são o método direto, o método de regressão e o método de substituição. Cada método possui suas vantagens, desvantagens e limitações. No método direto e no método de substituição faz-se necessária a formulação de uma dieta isenta de fósforo para a determinação das perdas endógenas e posterior correção do valor aparente para o valor verdadeiro. No método de regressão a perda endógena é determinada pelo intercepto da equação linear gerada, sendo mais oneroso e laborioso, devido à necessidade de formulação de várias dietas para um único ingrediente. O conhecimento acerca dos valores de digestibilidade de fósforo em diferentes ingredientes tem grande importância na formulação de dietas avícolas, uma vez que permite estimar de forma mais precisa quanto do fósforo a ser utilizado tem potencial de ser absorvido pelo animal.
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