Efeitos da uréia de liberação lenta nos parâmetros de fermentaçãono do rúmen em vitro, desempenho de crescimento, digestibilidade dos nutrientes e metabolitos séricos de gado de corte
DOI:
https://doi.org/10.5433/1679-0359.2020v41n4p1399Palavras-chave:
Gados de corte, Uréia de liberação lenta, Fermentação ruminal, Desempenho de crescimento, Metabólitos séricos.Resumo
Os dois experimentos foram conduzidos para investigar os efeitos da uréia de liberação lenta nos parâmetros de fermentaçãono do rúmen em vitro, desempenho de crescimento, digestibilidade dos nutrientes e metabolitos séricos de gado de corte. O design de fator único foi aplicado em ambos os experimentos. As três dietas com diferentes fontes de nitrogênio, incluindo farelo de soja (Grupo de controle), uréia de liberação lenta (Grupo de uréia de liberação lenta) e uréia comum (Grupo de uréia) foi designado (concentre-se em relação forrageira foi de 4: 6). As dietas foram formuladas para serem isoenergéticas e isonitrógenas, 75% da farinha de soja na dieta controle foi substituída por 1,41% de uréia de liberação lenta e 1,15% de uréia no Grupo uréia de liberação lenta e Grupo uréia, respectivamente. No experimento 1, cinco gados Jinjiang saudáveis (peso corporal médio (PC) de 380 ± 17,1 kg) com fístulas ruminais permanentes foram utilizadas no experimento de fermentação do rúmen em vitro. Os resultados mostraram que a suplementação de uréia de liberação lenta aumentou a taxa de degradação da substância seca, substância orgânica digestível e concentração de ácido propiônico no líquido cultivado, e a suplementação de SRU diminuiu o pH, NH3-N, ácido graxo volátil total, ácido acético, concentração de ácido butírico e eficiência de crescimento microbiano no fluido cultivado. No experimento 2, dezoito gados mestiços Simmental (PC = 315 ± 5,2 kg) foram estratificados por PC e, em seguida, atribuído aos três grupos para ter PC igual entre os grupos. Os resultados mostraram que a suplementação de uréia de liberação lenta reduziu a ingestão média da substância seca, digestibilidade aparente do extrato etéreo, a atividade da glutationa peroxidase, os níveis de IgG e IgA, e a produção de tiiodotronina (T3) no soro, a suplementação de uréia de liberação lenta aumentou a digestibilidade aparente da concentração de substância seca e substância orgânica e concentração de alanina aminotransferase no soro. Esses resultados indicaram que algum farelo de soja pode ser substituída por uréia de liberação lenta e uréia na produção de gado de corte. Além disso, comparado com a uréia, uréia de liberação lenta teve um bom efeito de liberação sustentada. A substituição de algum farelo de soja por uréia de liberação lenta na dieta não teve impacto adverso na fermentação ruminal, desempenho de crescimento e metabolitos séricos de gados de corte.Downloads
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2020-05-13
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Liang, H., Zhao, E., Feng, C., Wang, J., Xu, L., Li, Z., … Qu, M. (2020). Efeitos da uréia de liberação lenta nos parâmetros de fermentaçãono do rúmen em vitro, desempenho de crescimento, digestibilidade dos nutrientes e metabolitos séricos de gado de corte. Semina: Ciências Agrárias, 41(4), 1399–1414. https://doi.org/10.5433/1679-0359.2020v41n4p1399
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