Lactobacillus fermentum is a Gram-positive species of bacterium in the genus Lactobacillus. It is associated with active dental caries lesions. It is also commonly found in fermenting animal and plant material. It has been found in sourdough. A few strains are considered probiotic or "friendly" bacteria in animals and at least one strain has been applied to treat urogenital infections in women. Some strains of lactobacilli formerly classified as Lactobacillus fermentum (such as RC-14) have since been reclassified as Lactobacillus reuteri.

1.Promote the follicular development, repair fallopian tube damage, extend the peak of laying peak, slow down laying rate drop speed in the late stage; reduce the soft shelled egg, sand shell eggs, broken egg shell and malformed egg.

 2.Adjust the balance of flora, reduce refractory diarrhea.

Improve the layer poultry disease resistance and anti stress ability, decrease diarrhea caused by start laying egg stress and mortality rate.

3. Increase the feed conversion rate, reduce feed egg ratio, cost saving.

4.To improve the rate of fertilization, breeder eggs percent of pass and hatching rate, reduce the weak chicks. Reduce the houses of ammonia, hydrogen sulfide and other harmful gas, reduce the incidence of respiratory diseases.