In conclusion, rumen fermentation Environment of grazing sheep were a bad condition during most periods of the year.

• 熊本海等[11]的试验表明：随着灌注液中丙酸比例的升高，粪氮和尿氮的排出量显著减少，从而提高饲料氮的沉积能力，说明了当瘤胃液中乙酸浓度偏高时，确切讲是乙酸产生量与丙酸产生量不匹配时，显著影响动物沉积氮的能力。