Ref Code: PIG02

Category

Teaching - 2
Research - 4

Objective

To measure back fat thickness as an indicator of lean meat content of the carcase in the live pig using ultrasound.

Alternatives to animal use for teaching

Demonstration/practice using abattoir specimens and video may be carried out prior to use of live animals.

Details of procedure

Back fat is measured at the P2 position which is 65mm down the left side from the midline, at the level of the head of the last rib. The procedure is performed with the pig standing. Pigs are usually restrained in a stall, weigh crate or walkway; however, no restraint is needed if the pig stands quietly.

To locate the P2 site and measure back fat:

1. Find the rearmost edge of the last rib on the pig's left hand side.
2. Mark a spot vertically above on the midline.
3. From this spot, measure 70mm forward on the midline, and then 65mm down the left side from the midline.
4. Place the probe of the ultrasound machine directly over the P2 site according to the manufacturer's instructions, and record the fat measurement (a contact solution is usually required to get an accurate reading).

Drugs, chemicals or biological agents

Nil

Impact of procedure on wellbeing of animal(s)

The procedure is well tolerated.

Reuse and repeated use

It is preferable to use pigs accustomed to the procedure and which do not require restraint.

Pigs should not be restrained for more than 30 minutes.

Animals may be used repeatedly, unless they develop an aversion to the situation.

Care of animal(s) during/after procedure

Nil

Pain relief measures

Nil

Qualifications, experience skills or training necessary to perform this procedure

Students

Prior demonstration of the correct anatomical positioning and of the use of the machine to students is necessary.