Morphometric Measurements of Pigs as a Tool for Predicting Body Weight

Modern pig farming has increasingly benefited from innovative methods to estimate animal weight without relying solely on electronic scales, which are often unavailable or can cause unnecessary stress to the pigs. In regions where devices such as the Pesapig are not yet common, producers can adopt a practical approach by using rigorous measurement protocols and prediction equations.

The process begins with the standardization of measurements. It is essential to use a measuring tape to obtain variables that strongly correlate with the animals’ weight, such as the heart girth, which, when measured accurately, can offer up to 94% accuracy compared to traditional methods. Other measurements, such as carcass length and body circumference, can also be collected to complement the analysis, but the heart girth stands out due to the robustness of its correlation, as confirmed by various studies.

Once these data are collected, the values are applied to regression equations — which can be linear or nonlinear — developed based on research that considers the pigs’ genetic traits. For example, breeds such as the Piau, which have higher fat deposition, require specific equations, while commercial hybrids with greater muscle protein accumulation follow different parameters.

One of the classic equations, developed by researchers, relates the heart girth to body weight, allowing the producer to enter the measured value and obtain a reliable estimate of the animal’s body weight or even the ham weight — a premium cut that adds value to production.

This practical methodology is extremely useful because it eliminates the need for electronic equipment and power sources, while also reducing animal stress. With consistent measurements and the correct application of prediction equations, it becomes possible to adjust feed, administer medications accurately, and determine the ideal slaughter time, optimizing production efficiency and ensuring better zootechnical results.

In short, the use of morphometric measurements combined with prediction equations represents a valuable tool for pig farming. This practical and cost-effective approach enables producers — even in areas with limited access to advanced technology — to maintain strict control over animal performance and improve management of their operations, contributing to a more competitive and sustainable production.