Document Detail

Exercise training of late-pregnant and nonpregnant dairy cows affects physical fitness and acid-base homeostasis.
MedLine Citation:
PMID:  19164665     Owner:  NLM     Status:  MEDLINE    
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.
J A Davidson; D K Beede
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Journal of dairy science     Volume:  92     ISSN:  1525-3198     ISO Abbreviation:  J. Dairy Sci.     Publication Date:  2009 Feb 
Date Detail:
Created Date:  2009-01-23     Completed Date:  2009-02-09     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  2985126R     Medline TA:  J Dairy Sci     Country:  United States    
Other Details:
Languages:  eng     Pagination:  548-62     Citation Subset:  IM    
Department of Animal Science, Michigan State University, East Lansing 48824, USA.
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MeSH Terms
Acid-Base Equilibrium / physiology*
Bicarbonates / blood
Carbon Dioxide / blood
Cattle / blood,  physiology*
Heart Rate / physiology
Hemoglobins / analysis
Hydrogen-Ion Concentration
Lactic Acid / blood
Physical Conditioning, Animal*
Potassium / blood
Random Allocation
Time Factors
Reg. No./Substance:
0/Bicarbonates; 0/Hemoglobins; 124-38-9/Carbon Dioxide; 50-21-5/Lactic Acid; 7440-09-7/Potassium

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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