부산대학교 도서관

The impact of real-time ultrasound on the study of bovine reproduction has been dramatic and further development of portable ultrasound machines has given clinicians an added tool for diagnostic reproductive management. Ultrasonography with 3.0-7.5 MHz frequency linear probes is commonly used and preferred to monitor uterine anatomy, involution and pathology. The ability of ultrasound to identify pregnant versus non-pregnant animals earlier allows non-pregnant animals to be returned to breeding pool more quickly. Cows carrying foetus can be accurately identified using transrectal ultrasonography at 40-55 days post artificial insemination. Studies reveals that transrectal color doppler ultrasonography is a useful technique for non-invasive evaluation of genital perfusion in bovines. Ultrasound examination of reproductive tract provides a 'foot in the door' to help and manage dairy herds [e.g., nutrition, culling, business opportunity, reproduction) and to start offering other ultrasound medical services at the cow level. [ABSTRACT FROM AUTHOR]