Based on Bowler’s original 6-class-scale but further adapted to better fit forms of abdominal profiles as observed in the field, new revised illustrations were prepared (by G. Eichhorn & F. Mohrwinkel at NABU, Germany). Please refer to these revised illustrations and descriptions as a reference when scoring the Abdominal Profile Index (API). Additionally, you can download silhouettes, where you can draw the abdominal profile line yourself, as a practical exercise that helps familiarizing with profile differences and for recording observations in the field.

It is recommended to observe the animal for a sufficiently long period in the field, ensuring that it is in a favorable position for assessment: side-on to the observer, in a relaxed posture (not in a tense position when alarmed or pulling at food items, because contracted belly muscles may change the profile). Note that when assessing the API, the score given should always reflect the relative volume of fat stored in the abdomen, while the exact shape of the profile line is less relevant.

Printable templates for use in the field can be downloaded below.