Application of ultrasound for genetic improvement

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Abstract
Genetic improvement programs for livestock would be enhanced by the ability to accurately and easily measure body composition of live animals or to make measurements at anatomical reference points that can be used to accurately predict body composition. Advances in ultrasonic technology, such as real-time imagery and portable ultrasound units, have renewed interest among animal scientists working with genetic improvement programs and the livestock industry groups they serve. Ultrasound has been used for more than 30 yr and, for swine, has been demonstrated to improve significantly the accuracy of predicting body composition. However, many studies have shown less success in improving prediction of body composition from the use of ultrasonics to measure live beef cattle and sheep. The swine industry probably will be the first to benefit measurably from use of ultrasound technology in large-scale genetic improvement programs for carcass merit. Considerable research and development is needed before ultrasound technology can be effectively used in similar large-scale programs in the beef cattle and sheep industries.

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