• 1. O'Brien RT. Ultrasound is helping to keep shows clean. Hoard's Dairyman 2002; 294.

  • 2. Trostle SS, O'Brien RT, Britt J, et al. Ultrasonographic appearance of exogenous isobutane gas in the mammary gland of dairy cows. J Am Vet Med Assoc 1999; 215: 366368.

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  • 3. O'Brien RT, Waller KR, Matheson JS. Ultrasonographic appearance of edema caused by injections in the mammary gland attachments of dairy cows. J Am Vet Med Assoc 2002; 221: 408410.

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  • 4. Kohler P, Alsaaod M, Dolf G, et al. A single prolonged milking interval of 24h compromises the well-being and health of dairy Holstein cows. J Dairy Sci 2016; 99: 90809093.

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  • 5. Waller KR, O'Brien RT, McGuirk SM. Ultrasonographic distribution and duration of edema in the post-partum and over-bagged dairy cows. Bovine Pract 2007; 41: 129133.

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Contributor Notes

Address correspondence to Dr. O'Brien (rtobrien63@gmail.com).