Data/hora: 11/06/2024 02:42:17

Provedor de dados: | 65
País: | Brazil
Título: | Dynamics of change in fermentation and fatty acid profiles in high moisture alfalfa silage during ensiling at different temperatures
Autores: | Liu,Qinhua; Dong,Zhihao; Shao,Tao.
Data: | 2018-01-01
Ano: | 2018
Palavras-chave: | Silage; Fermentation quality; Fatty acid; Temperature.
Resumo: | ABSTRACT: The objective of present study was to investigate the dynamics of change in fermentation and fatty acid profiles in high moisture (DM=232g/kg FW) alfalfa silages during ensiling at 45°C, 30°C and 15°C. After ensiling for 1, 3, 7, 21, 39 and 65 days, silages was sampled and examined. Lactic fermentation changing into butyric fermentation in silage ensiled at 30°C and 45°C occurred on ensiling for 21 and 65 days, respectively, as accompanied with high ammonia-N content ( &gt;150g/kg N), which subsequently resulted in a sudden increase of pH (P &lt; 0.05). In contrast, the increase of lactic acid content was observed in silage ensiled at 15°C during ensiling for 65 days (P&lt;0.05). As the ensiling temperature rose, considerable losses in total FA, C18:2n6 and C18:3n3 increased after ensiling for 1 day as compared with alfalfa before ensiling (P &lt; 0.05) mainly due to thermolability of polyunsaturated FA and multiplication of lactic acid bacteria. Contents of total FA, C18:2n-6 and C18:3n-3 fluctuated in silage stored at 30°C and 45°C during ensiling from 3 to 65 days (P &lt; 0.05), but decreased at 15°C due to the intervention of aerobic bacteria, yeasts and lipoxygenase. Therefore, after ensiling for 65 days, high moisture alfalfa silage ensiling at 15°C had better fermentation quality than at 30°C and 45°C. Temperature had significant influence on dynamics of change in FA profile in alfalfa silage during ensiling.
Tipo: | Info:eu-repo/semantics/article
Idioma: | Inglês
Identificador: | http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-84782018000300652
Editor: | Universidade Federal de Santa Maria
Relação: | 10.1590/0103-8478cr20170605
Formato: | text/html
Fonte: | Ciência Rural  v.48 n.3 2018
Fonte: | info:eu-repo/semantics/openAccess