According to JDW magazine, portholes are openings in the side of a cow that allows researchers to access an animal's stomach with a cannula. It is an operation done under anaesthetic and the cow tends to live longer than the average cow. The hole is big enough to allow a person to put her/his hand down it.
A flanged rubber cylinder is installed inside, behind its 13th rib. The cylinder typically is fitted with a plastic, rubber, or metal cap to keep rumen anaerobic. The operation is done when the cow is standing to prevent rumen contents from leaking into the rest of the abdominal cavity. A cow has a recovery period of 6 weeks.
Researchers can deposit food samples or take them out with aim of researching the most elective form to feed it so that cows produce more milk. Contents from a healthy cow can be pull and given to sick cows that have health problems in the rumen to repopulate the fauna. It also helps to evaluate treatment for a PH imbalance called subacute ruminal acidosis.
Cannulation is used in research that aims to reduce methane emissions from livestock. Microbes in the fistulaated cow's stomach are studied and sometimes transferred to other animals. If the cows are having trouble with the digestive process, the stomach holes allow farmers to transplant the aforementioned bacteria and fungi into their stomachs. The holes also give the farmer a chance to evaluate digestion and give their cows optimal foods.
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