Changes throughout estrous cycles of variables that might indicate estrus in dairy cows

Journal of Dairy Science
G S Lewis, S K Newman

Abstract

Two experiments examined physiological changes throughout estrous cycles of Holstein cows. In experiment one, changes were characterized for physical activity, vaginal pH, vaginal temperature, milk yield, heart rate, and concentration in blood plasma of progesterone and 13,14-dihydro-15-keto-prostaglandin F2 alpha. Variables were measured daily in 11 cows through a total of 28 estrous cycles. Cows in estrus at least once postpartum were used. Observations for estrus were at least twice daily. Variables changed significantly with day of estrous cycle. Changes of progesterone, physical activity, and 13,14-dihydro-15-keto-prostaglandin F2 alpha were more marked around estrus than were changes of the other variables. Peaks of physical activity coincided with estrus in 75% of the cases. Experiment two was to determine if increased physical activity, measured with pedometers, coincided with estrus in commercial dairy herds. Cows on 14 farms in New York were fitted with mechanical pedometers, and the pedometers were read at each milking. Readings from 3 days before until 3 days after estrus were used from 55 estrous periods identified by the producers. Physical activity was maximal on day of estrus in 73% of the estrous periods. Incre...Continue Reading

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Citations

Jul 29, 2003·BMC Physiology·Giuseppe PiccioneRoberto Refinetti
Nov 28, 2016·Journal of Dairy Science·J A SaulsJ S Stevenson
Nov 21, 2017·Journal of Dairy Science·J S Stevenson, J H Britt
Apr 29, 2011·Journal of Dairy Science·V S SutharW Heuwieser
May 14, 2014·Journal of Dairy Science·J S StevensonJ M DeJarnette
Nov 1, 1986·Journal of Dairy Science·J S Walton, G J King
Jul 1, 1991·Journal of Dairy Science·E D HarwoodM K Clayton
Feb 1, 2007·American Journal of Physiology. Endocrinology and Metabolism·Nathan A HunnellJudy L Cameron
Mar 4, 2019·Tropical Animal Health and Production·Serdar Duru, Süleyman Can Baycan
Jan 7, 2021·Animals : an Open Access Journal From MDPI·Musadiq IdrisClive J C Phillips

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