What is gastric intubation primarily used for in laboratory animals?

Gastric intubation is primarily utilized in laboratory animals to administer medication or nutrients directly into the stomach. This method allows for precise control over the dosage and ensures that the substances reach the digestive system effectively. It is particularly useful in situations where an animal may be reluctant to eat or when rapid absorption of a medication is required.

In contrast, other options such as collecting blood samples, sedating the animal, or monitoring heart rate are different procedures that do not involve gastric intubation. Blood sampling typically requires venipuncture and is separate from the introduction of substances into the gastrointestinal system. Sedation involves delivering anesthetics or sedatives, usually via injection or inhalation, rather than a gastrointestinal route. Monitoring heart rate can involve non-invasive techniques or use of specialized equipment, also not related to gastric intubation. Therefore, the correct focus for gastric intubation is its role in delivering needed medical treatments and nutritional support directly into the stomach.