Date of Award
Master of Science
Anna K. Johnson
The objectives of these studies were to determine the effect of selection for reduced residual feed intake (RFI) on activity, lesion scores and temperament in gilts. Purebred Yorkshire gilts were utilized (n=192). Half were from a line that had been selected for five generations for reduced RFI (LRFI) and half were from a randomly bred line, which served as a control (CRFI). On the day of placement there were no differences between the lines regarding general activity, however LRFI gilts had lower lesion scores. Over the trial, the LRFI gilts had lower overall activity, but lesions were not different between lines. The LRFI gilts scored lower during an initial temperament score. While both lines' temperament scores decreased over the trial, CRFI gilts had a greater percentage decrease and scored lower than the LRFI gilts by the end. Selection for reduced RFI reduced activity and did not detrimentally affect temperament.
Larry J. Sadler
Sadler, Larry J., "The effect of selection for residual feed intake on general behavioral activity, occurrence of lesions, scale activity and exit score in Yorkshire gilts" (2009). Graduate Theses and Dissertations. 11107.