不同酵母培养物对绵羊瘤胃体外发酵参数的影响

Effects of Different Yeast Cultures on Rumen Fermentation Parameters of Sheep in Vitro

摘要:

为验证不同类型及比例的酵母培养物（YC）对绵羊瘤胃体外发酵参数的影响。采用全因子试验设计，在发酵底物条件下分别添加不同类型及比例的YC，一个对照组、4 个试验组,测定体外发酵参数浓度；发现YC- 3 能极显著降低培养液 pH和丙酸浓度，显著增加异丁酸浓度和乙丙比。在体外条件下添加 1%、2%YC 均能显著增加培养液中乙酸浓度，添加 4%YC 能极显著降低异戊酸的浓度 。YC 不同来源和不同水平影响绵羊瘤胃体外发酵 pH 、丙酸及乙丙比等发酵参数，用于指导畜牧生产实际。

Abstract:

This study was to verify the effects of different types and proportions of yeast culture (YC) on the rumen fermentation parameters of sheep in vitro. This experiment adopts a full factorial design, and different types and proportions of YC are added under the condition of fermentation substrate. The experiment was divided into a control group and 4 test groups and the concentrations of in vitro fermentation parameters were determined. It was found that YC-3 can significantly reduce the pH and propionic acid concentration of the culture medium, and significantly increase the isobutyric acid concentration and ethylene-propylene ratio. Adding 1% and 2% YC can significantly increase the concentration of acetic acid in the culture medium under in vitro conditions, and adding 4% YC can significantly reduce the concentration of isovaleric acid. The different sources and different levels of YC will affect the fermentation parameters such as pH, propionate and ethylenepropylene ratio of sheep rumen in vitro fermentation. These results are expected to be used to guide livestock production practice.