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