The effects of different additives on the sensory quality,nutritional composition,and fermentation quality of alfalfa silage feed
To investigate the effects of different additives on the sensory quality,nutritional composition,and fermentation quality of alfalfa silage feed.Select alfalfa harvested from the same batch for the experiment,air dry and control water before crushing.The experiment was divided into 5 groups.The control group was sprayed with 5 mL/kg distilled water(with a moisture content controlled at around 70% ),while the other 4 groups were sprayed with equal amounts of fermentation inhibitors(0.4% formic acid solution,0.4% acetic acid solution)and fermentation promoters(50 mg/kg cellulase solution,50 mg/kg lactic acid bacteria solution),respectively,named formic acid group,acetic acid group,cellulase group,and lactic acid bacteria group.After 40 days of sealed,compacted and fermented fermentation,5 feed samples were taken from the middle position of each group for testing.The results showed that:(1)The total score and grading of the 5 groups were 40 points poor,59 points moderate,64 points excellent,68 points excellent,and 69 points excellent,respectively.From a sensory perspective,the quality is ranked from high to low as follows:lactic acid bacteria group,cellulase group,acetic acid group,formic acid group,and control group.(2)Compared with the control group,the formic acid group,acetic acid group,cellulase group,and lactobacillus group significantly increased the dry matter content in alfalfa silage feed(P＜0.05);The crude protein content in alfalfa silage feed was significantly increased in the cellulase group and lactic acid bacteria group(P＜0.05),and the neutral detergent fiber content was significantly reduced(P＜0.05).The acid washing fiber content in the cellulase group of alfalfa silage feed was significantly lower than that in the control group,formic acid group,acetic acid group,and lactic acid bacteria group(P＜0.05).(3)Compared with the control group,the pH value and ammonia nitrogen content of alfalfa silage feed in the formic acid group,acetic acid group,cellulase group,and lactobacillus group were significantly reduced(P＜0.05),while the butyric acid content was significantly reduced(P＜0.01),and the lactate content was significantly increased(P＜0.01).The lactic acid content of alfalfa silage in the lactic acid group was significantly higher than the other four groups(P＜0.05),while the acetic acid content of alfalfa silage in the acetic acid group was significantly higher than the other four groups(P＜0.05).Conclusion:Fermentation inhibitors and fermentation promoters both improved the sensory quality,nutritional composition,and fermentation quality of alfalfa silage feed.Among them,using cellulase and lactic acid bacteria as additives has the best effect.
NETL
NSTL
万方数据
