Comparison of Joint Angles for Feet and Leg Conformation Traits between Gilts at Selection and at their Second Gestation and Sows Parity 5 and Above

This study is a portion from the validation process of an objective methodology to measure feet and leg joint angles and to evaluate their relationship with sow longevity. Joint angle measurements from five feet and leg conformation traits (knee, hock, front and rear pasterns and rear stance) that have been previously described in the literature as being related with sow longevity were obtained from maternal gilts at selection and during their second gestation and compared with those obtained from 45 crossbred sows parity 5 and above. Significant differences (P < 0.05) between parities were identified in the knee, both pasterns, hock and rear stance joint angle measurements. These results suggest that as pigs age, structural changes occur. The range of which these changes occur could carry implications for the use of objective feet and leg angles towards future selection programs and protocols.