体外产气法及尼龙袋法评价燕麦草的饲用价值OA

The experiment aimed to investigate the effects of different proportions of oat hay replacing corn straw on the in vitro gas production,fermentation parameters,and rumen degradation characteristics of Hu sheep through in vitro gas production and nylon bag techniques,and to determine the appropriate ratio of oat hay in Hu sheep production.Oat hay was used to replace corn straw in proportions of 0(CON group),25%(25%substitution group),50%(50%substitution group),75%(75%substitution group),and 100%(100%substitution group),and rumen fluid was collected from fistula sheep for in vitro gas production and nylon bag experiments to determine gas production parameters,fermentation parameters,and rumen degradation rate.The results showed that the substitution ratio of oat hay had no significant effect on the 72 hour cumulative gas production(P>0.05).The rapid gas production of the 25%,50%,and 75%substitution groups was extremely higher than that of the CON group and the 100%substitution group(P<0.01),and the slow gas production and potential gas production of the 50%substitution group were significantly higher than those of the other groups except for the 75%substitution group(P<0.05).The content of bacterial protein in the 100%substitution group was significantly higher than that of the other groups(P<0.05),and the ammonia nitrogen content was significantly lower than that of the other groups(P<0.05).The 6-hour dry matter degradation rate of the 25%substitution group was extremely higher than that of the other groups(P<0.01),and the slow degradation of the 75%and 100%substitution groups was significantly higher than that of the 25%and 50%substitution groups(P<0.05).The 24-hour crude protein degradation rate of the 75%substitution group was significantly higher than that of the other groups except for the 100%substitution group(P<0.05),and the 24-hour neutral detergent fiber degradation rate of the CON group and the 25%substitution group was significantly higher than that of the 75%and the 100%substitution groups(P<0.05).The 48-hour degradation rate of acidic detergent fiber was highest in the 100%substitution group,significantly higher than that in the 50%substitution group(P<0.05).The effective degradation rate of crude protein in the 75%substitution group was extremely higher than that in the other groups(P<0.01).The study shows that when oat hay is used to replace corn straw at a ratio of 50%to 75%(oat hay accounts for 10%to 15%of the feed),the nitrogen release rate of the feed is optimal and the nutrient utilization efficiency is highest.