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Journal of Dairy Science Vol. 84 No. 12 2599-2606
© 2001 by American Dairy Science Association ®
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Recovery of Cow Teats after Milking as Determined by Ultrasonographic Scanning

F. Neijenhuis 1, G. H. Klungel 1, and H. Hogeveen 1

1 Research Institute for Animal Husbandry, P.O. Box 2176, 8203 AD Lelystad, The Netherlands

Recovery time of teat tissue after milking was determined by ultrasonographic scanning. Teat-canal length, teat-end width, teat-wall thickness, and teat-cistern width of 18 cows varying in parity and lactation stage were measured in duplicate before and directly after milking and every hour for 8 h. The ratio between teat-wall thickness and teat-cistern width was calculated. The effects of time after milking and teat position on the teat parameters were estimated using REML models. The mean differences of ultrasound measurements of teat-end width and teat-canal length between duplicate measurements were 3.6 and 8.2%, and between d 4.4 and 7.8%, respectively. Teat-wall thickness and teat-cistern width were more variable (15.3 and 22% between duplicates, and 13.6 and 19.9% between days, respectively).

Teat recovery after milking took a considerable amount of time: teat-wall thickness, 6 h; teat-end width, >8 h; teat-canal length, >8 h; teat-cistern width for rear teats, 3 h, and front teat 8 h, and the ratio of teat-wall thickness and teat-cistern width, 6 h.

Ultrasonographic scanning of teat parameters was a useful tool to study teat changes caused by milking. Teat recovery took more time than expected, which makes caution necessary when increasing the milking frequency.

Key Words: ultrasonographic scanning • teat condition

Submitted on December 26, 2000
Accepted on July 16, 2001




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