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Ultrasonographic ovarian dynamic, plasma progesterone and non-esterified fatty acids in lame postpartum dairy cows
Pedro Melendez1,*, Veronica Gomez2, Hans Bothe3, Francisco Rodriguez3, Juan Velez3, Hernando Lopez4, Julian Bartolome5, Louis Archbald2
1College of Veterinary Medicine, University of Missouri, Columbia, MO, USA
2College of Veterinary Medicine, University of Florida, Gainesville, FL, USA
3Aurora Organic Dairy Farm, Plateville, CO, USA
4ABS Global, Inc. DeForest, WI, USA
5Facultad de Ciencias Veterinarias, Universidad Nacional de La Pampa, LP, Argentina
Correspondence to: Tel: +1-573-882-7821; Fax: +1-573-823-9383; E-mail: melendezp@missouri.edu
Received: March 27, 2017; Revised: June 12, 2018; Accepted: February 2, 2018; Published online: February 27, 2018.
The objective of this study was to compare ovulation rate, number of large ovarian follicles, plasma progesterone (P4) and non-esterified fatty acids (NEFA) concentrations between lame (n=10) and non-lame (n=10) lactating Holstein cows. The study was conducted in an organic dairy farm and cows were evaluated by ultrasonography and blood sampling every 3 days from 30 days postpartum during a period of 34 days. Cows which became lame during the first 30 days postpartum that experienced a lower ovulation rate were determined by the presence of a corpus luteum (50% for lame cows and 100% for non-lame cows, P ≤ 0.05). The number of large ovarian follicles in the ovaries was 5 for lame cows and 7 for non-lame cows (P=0.09). In addition, lame cows showed lower (P ≤ 0.05) concentrations of plasma P4 compared to non-lame cows. Furthermore, NEFA concentrations were lower (P ≤ 0.05) in lame cows compared to non-lame cows. It is concluded that lameness in postpartum dairy cows was associated with failure of ovulation, lower P4 concentrations and lower levels of NEFA.
Keywords: lameness, ovulation, postpartum dairy cows, progesterone, non-esterified fatty acids

© 2018 The Korean Society of Veterinary Science.