English to Polish Tech/Engineering Livestock / Animal Husbandry

Dotyczy przemysłowej hodowli trzody chlewnej.

(...) Often economically important traits are difficult or expensive to measure (e.g., feed intake, disease resistance) or are not expressed early in an animals' lifetime (e.g., longevity of production), and often selection is practiced based on an index of traits correlated to the characters in the objective that may be easier to measure and/or measured early in life.