Measurement of gas from fermentation of microbial flora produces the amount of gas as a final product in lab conditions to measure bacteria growth.
Many screening methods use this proxy to test the antimicrobial activity of some secondary plants like tannin and essential oil. These activities are applicable in testing the micro-organisms in the digestive tract of a chicken.



Fermentation is the enzymatic decomposition and utilization of foodstuff, mainly carbohydrates made by microbes. Fermentation occurs through the digestive system of animals. However, the intensity of fermentation depends on the number of microbes in the large intestine. Therefore, the large intestine is the most important in the smallest place of fermentation except for the animals who have a foregut. Other than that, there are a lot of differences in fermentation between animals such as dogs and cats and even in humans. But this amount of fermentation is a reason for life for vegetarians.
The epithetical cells of the large intestine do not produce digestive enzymes but have a huge number of bacteria that contain the right enzymes to digest and utilize many substrates. In all animals, two processes are attributed to the microbial flora of the large intestine:
Digestion and metabolism of undigested carbohydrates in the small intestine like cellulose and residual starch synthesis of vitamin K and some certain B vitamins.
Microbial fermentation is used in the process of using microbes to make products needed by humans using raw materials. The level of fermentation depends on genetic characteristics and cultural conditions. Fermentation engineering such as pharmacal industry, chemical industry, food industry, environmental protection, and other fields. Microbial fermentation according to the fermented conditions is divided into two things such as aerobic fermentation and anaerobic fermentation. Microbes that are mainly used in industrial production are mainly bacteria, actinomycetes, fungi, and yeasts. According to the engineering of fermentation and, genetic engineering viruses and algae are mainly used for becoming microbes for industrial production.