How can a rat be fed with a syringe? - briefly
A sterile 1 ml syringe equipped with a soft feeding tube should be filled with a nutritionally balanced liquid diet warmed to body temperature. The tube is introduced gently into the esophagus and the solution is delivered in 0.1‑0.2 ml aliquots, pausing between feeds to observe for regurgitation or respiratory distress.
How can a rat be fed with a syringe? - in detail
Feeding a laboratory rat with a syringe requires precise equipment, careful restraint, and correct technique to avoid injury and ensure adequate nutrition.
Essential supplies include a sterile 1‑ml or 3‑ml syringe, a flexible 22‑ to 25‑gauge feeding needle, a calibrated pipette or graduated cylinder for measuring liquid diet, a soft towel or restraint device, and a disinfectant for cleaning the needle after each use. All items should be sterilized before the procedure.
The animal must be gently but securely restrained. Place the rat on a soft cloth, cover the forepaws with a small towel, and hold the torso with one hand while the other hand supports the head. This position minimizes stress and prevents sudden movements.
Prepare the nutritional solution according to the species‑specific formula, ensuring the temperature is approximately 37 °C to match body temperature. Mix the feed thoroughly to eliminate clumps, then draw the required volume into the syringe. Typical daily intake for an adult rat ranges from 0.5 ml to 1.5 ml, divided into several small administrations.
Insert the feeding needle into the oral cavity at a shallow angle, aiming for the back of the tongue to avoid the teeth. Advance the needle just enough to enter the oropharynx, then depress the plunger slowly, delivering the liquid in a steady stream. Pause briefly after each 0.2‑ml aliquot to allow the rat to swallow before continuing.
Observe the animal for signs of aspiration, such as coughing or labored breathing. If resistance occurs, stop the infusion, withdraw the needle, and reassess the position. After feeding, wipe the mouth with a damp cloth, release the restraint, and monitor the rat for at least five minutes to confirm normal respiration and activity.
Clean the needle and syringe with an appropriate disinfectant, rinse with sterile water, and store them in a sealed container until the next session. Record the volume administered, time of feeding, and any observed reactions for future reference.