Question 1

What factors determine which blood collection site to use in pigs?

Accepted Answer

Blood collection site selection depends on the pig's age, body size, required blood volume, study objectives, and IACUC-approved limits. The marginal ear vein suits small-volume repeated sampling across all ages. The external jugular vein is preferred for moderate to large collections in juvenile and adult pigs. The cranial vena cava provides larger volumes but requires advanced training and anatomical knowledge.

Question 2

How should you collect blood from the marginal ear vein in pigs?

Accepted Answer

Aseptically swab the restrained pig's ear and insert a needle with the bevel up at a shallow angle to obtain small blood volumes. After collection, apply gentle pressure to the site until hemostasis is achieved. This technique minimizes tissue trauma and is suitable for small-volume and repeated sampling in pigs of all ages.

Question 3

What is the proper technique for jugular vein blood collection in pigs?

Accepted Answer

Aseptically swab the pig's neck and collect a larger blood sample through the jugular groove using secure restraint and experienced personnel. Following collection, apply pressure to prevent bleeding or hematoma formation. The external jugular vein is preferred for moderate to large blood collections in juvenile and adult pigs.

Question 4

Why is low-stress restraint important during pig blood collection?

Accepted Answer

Low-stress handling and positive reinforcement training reduce stress-induced effects on sample quality and improve animal welfare. Pigs can be trained to voluntarily enter restraint devices such as slings, allowing blood collection while minimizing stress. Proper restraint balances animal welfare, personnel safety, and scientific objectives.

Question 5

What post-collection care is necessary after blood sampling from pigs?

Accepted Answer

After needle withdrawal, apply pressure until hemostasis is achieved and monitor the pig for bleeding, hematoma formation, respiratory abnormalities, or behavioral changes. Refinement practices that reduce procedural discomfort support animal welfare and enhance the reliability and reproducibility of research data.

Question 6

What are the IACUC restrictions on blood collection volumes in pigs?

Accepted Answer

IACUC typically restricts survival blood draws to 1% of the animal's body weight every two weeks. The choice of sampling site and volume depends on the pig's age, body size, study objectives, and approved institutional protocols. Trained personnel must follow these guidelines to ensure compliance and animal welfare.

Question 7

When is cranial vena cava blood collection appropriate in pigs?

Accepted Answer

The cranial vena cava can provide larger blood volumes but requires advanced training and knowledge of anatomical landmarks. After needle withdrawal, ensure hemostasis and monitor the pig for site-specific adverse reactions. This technique is reserved for situations requiring large-volume samples when scientifically justified and personnel are properly trained.

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