Utilização de grão inteiro de aveia como fonte de fibra na ração de bezerros
DOI:
https://doi.org/10.31285/AGRO.25.372Palavras-chave:
bovinos, crescimento, fibra eficaz, digestão, eficiência de conversãoResumo
Dois experimentos foram conduzidos como o objetivo de estudar o valor do grão inteiro de aveia (GIA) como fonte de fibra fisicamente efetiva (peFDN) em rações para bezerros. No experimento 1, 24 bezerros Hereford (177 ± 18 kg) foram sorteados em oito grupos e estes assignado ao acaso a quatro rações experimentais (79% de concentrado), definidas pelo aumento dos níveis de substituição de feno de moha (FM) pelo GIA: 0 : 21, 7:14, 14: 7, 21: 0% da matéria seca (MS) GIA: FM, respectivamente. O aumento do GIA resultou numa resposta quadrática de peFDN (P= 0,04) atingindo mais de 15%. O consumo aumentou quadraticamente (P= 0,03) e a digestibilidade linearmente (P= 0,03). Como resultado, quanto maior o GIA, a conversão alimentar tendeu a melhorar (P= 0,08). No experimento 2, quatro novilhos portadores de cânula ruminal foram designados num delineamento crossover a duas rações (65% concentrado) diferindo na fonte de peFDN: 35% FM ou 35% GIA, a fim de estudar as características fermentativas. A substituição de FM por GIA reduziu o pH médio do rúmen (5,9 vs. 6,3, P<0,01), variando entre 6,1 e 5,8, permanecendo 24 horas abaixo dos valores de FM. A fração da MS potencialmente degradável no rúmen não foi afetada, mas o GIA aumentou a taxa de fermentação (35,0 vs 9,0% / h; P= 0,02), e a degradabilidade efetiva (58,3 vs 65,4%; P= 0,048). Os resultados de ambos os experimentos sugerem que é viável o uso de GIA como fonte de peFDN em rações concentradas.
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