Exercise training of late-pregnant and nonpregnant dairy cows affects physical fitness and acid-base homeostasis
- 1 February 2009
- journal article
- Published by American Dairy Science Association in Journal of Dairy Science
- Vol. 92 (2), 548-562
- https://doi.org/10.3168/jds.2008-1458
Abstract
The objective was to determine if exercise training improves physical fitness of nonlactating, late-pregnant and nonpregnant multiparous Holstein cows and alters acid-base homeostasis during an exercise test on a treadmill. Twenty-six pairs (each pair having 1 late-pregnant and 1 nonpregnant) of cows were assigned to treatments of exercise training or no exercise. Exercise training was walking (1.25 to 1.5 h at 3.25 km/h) every other day in an outdoor mechanical walker for 70 d. Cows completed treadmill exercise tests on d 0, 30, and 60 of the experiment or about d 70, 40, and 10 before expected parturition of the pregnant cow of each pair. On d 0, physical fitness was similar among all cows based on durations of treadmill tests, heart rates, and acid-base measurements at given workloads (21.1 +/- 0.6 min; 144 +/- 2.2 beats per min; plasma lactate 3.1 +/- 1.9 mmol/L; and venous blood pH 7.44 +/- 0.0035, respectively). After 60 d of training, exercised cows walked longer during treadmill exercise tests compared with nonexercised cows (23.7 vs. 18.3 +/- 0.85 min, respectively), indicating greater physical fitness (pooled across pregnancy status). Heart rates and plasma lactate concentrations at given workloads were less (144 vs. 156 +/- 2.7 beats per min; and 1.4 vs. 3.2 +/- 0.24 mmol/L for exercised compared with nonexercised cows, respectively). Additionally, exercised cows more effectively maintained acid-base homeostasis during treadmill tests compared with nonexercised cows. Metabolic, endocrine, and nutritional demands associated with late pregnancy did not affect responses differently to exercise training for late-pregnant compared with nonpregnant cows. Overall, exercise training of late-pregnant and nonpregnant cows for 60 d improved physical fitness.Keywords
Funding Information
- C. E. Meadows Endowment
This publication has 17 references indexed in Scilit:
- A System to Assess Fitness of Dairy Cows Responding to Exercise TrainingJournal of Dairy Science, 2003
- Influence of treadmill exercise on pituitary-adrenal secretions, other blood constituents, and meat quality of sheep1Journal of Animal Science, 1994
- Serum potassium during exercise in Hereford calves: influence of physical conditioningJournal of Applied Physiology, 1988
- Maternal heart rate in pregnancyAmerican Journal of Obstetrics and Gynecology, 1985
- Exercise dynamics in late gestation: Effects of physical trainingAmerican Journal of Obstetrics and Gynecology, 1985
- Respiratory, cardiovascular, and metabolic adjustments to exercise in the Hereford calfJournal of Applied Physiology, 1985
- Attaining and Measuring Physical Fitness in Dairy CattleJournal of Dairy Science, 1982
- Plasma Catecholamine and Parathyroid Hormone Responses in Cattle during Treadmill Exercise at Simulated High AltitudeHormone and Metabolic Research, 1979
- The Influence of Physical Training during Pregnancy on Physical Work Capacity and Circulatory ParametersScandinavian Journal of Clinical and Laboratory Investigation, 1976
- Die Herzschlagfrequenz während standardisierter Belastung als Maß für die Leistungsfähigkeit von Pferden1)Zentralblatt für Veterinärmedizin Reihe A, 1973