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Tytuł pozycji:

Physiological effects of starter-induced ruminal acidosis in calves before, during, and after weaning.

Tytuł :
Physiological effects of starter-induced ruminal acidosis in calves before, during, and after weaning.
Autorzy :
Gelsinger SL; Department of Dairy Science, University of Wisconsin, Madison 53706. Electronic address: .
Coblentz WK; USDA-Agricultural Research Service, US Dairy Forage Research Center, Marshfield, WI 54449.
Zanton GI; USDA-Agricultural Research Service, US Dairy Forage Research Center, Madison, WI 53706.
Ogden RK; USDA-Agricultural Research Service, US Dairy Forage Research Center, Marshfield, WI 54449.
Akins MS; Department of Dairy Science, University of Wisconsin, Madison 53706.
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Źródło :
Journal of dairy science [J Dairy Sci] 2020 Mar; Vol. 103 (3), pp. 2762-2772. Date of Electronic Publication: 2019 Dec 25.
Typ publikacji :
Journal Article
Język :
Journal Info :
Publisher: American Dairy Science Association Country of Publication: United States NLM ID: 2985126R Publication Model: Print-Electronic Cited Medium: Internet ISSN: 1525-3198 (Electronic) Linking ISSN: 00220302 NLM ISO Abbreviation: J. Dairy Sci. Subsets: MEDLINE
Imprint Name(s) :
Publication: Champaign, IL : American Dairy Science Association
Original Publication: Lancaster, Pa. [etc.]
MeSH Terms :
Animal Feed/*analysis
Cattle Diseases/*physiopathology
Dietary Fiber/*administration & dosage
Fatty Acids, Volatile/*metabolism
Starch/*administration & dosage
Acidosis/physiopathology ; Acidosis/prevention & control ; Animals ; Cattle ; Cattle Diseases/prevention & control ; Diet/veterinary ; Hydrogen-Ion Concentration ; Male ; Milk Substitutes/metabolism ; Rumen/physiopathology ; Weaning
Contributed Indexing :
Keywords: acidosis; calf; pH
Substance Nomenclature :
0 (Dietary Fiber)
0 (Fatty Acids, Volatile)
9005-25-8 (Starch)
Entry Date(s) :
Date Created: 20191229 Date Completed: 20200610 Latest Revision: 20200610
Update Code :
Czasopismo naukowe
The objectives were to nutritionally induce or blunt ruminal acidosis in young calves and to compare indicators of rumen and systemic health. Ten bull calves (n = 5/diet) were ruminally cannulated at 3 wk of age and received milk replacer and 1 of 2 calf starter diets that were designed to cause (AC; pelleted, 42.7% starch, 15.1% neutral detergent fiber, 57.8% nonfiber carbohydrates) or blunt (BL; texturized, 35.3% starch, 25.3% neutral detergent fiber, 48.1% nonfiber carbohydrates) ruminal acidosis. Mean birth weight was 38.7 ± 1.3 kg. Body weight and calf starter intake were measured weekly. Rumen contents were sampled at -8, -4, 0, 2, 4, 8, 12, and 24 h relative to starter feeding during wk 6, 8, 10, 12, 14, and 16 of age. Blood was collected from the jugular vein during the same weeks for complete blood cell count, blood pH, and partial pressures of oxygen and carbon dioxide. Rate of starter consumption was assessed during wk 16. Marker systems were used to estimate liquid passage and volatile fatty acid absorption rates. Calves were slaughtered at 17 wk, and rumen tissue was collected and assessed for papillae length, width, and degree of tissue degradation. Mean ruminal pH ± standard error was 5.37 ± 0.24 and 5.63 ± 0.24 for AC and BL calves, respectively. Lowest pH values were observed the week after weaning. Total ruminal volatile fatty acid concentrations were 131.5 and 124.8 ± 2.4 mM in AC and BL calves, respectively, and increased with age and time after feeding. Dry matter intake was lower in AC calves at wk 4 and remained lower through wk 16. Rate of starter consumption was also lower in AC calves at wk 16. Body weight also was also lower for AC calves from wk 5 through 16. Blood hemoglobin and hematocrit were lower in AC calves, but other blood characteristics were not different. Rumen volume increased with age and tended to be greater in BL calves. Passage rate and papillae length and width were not different between diets, but AC calves experienced a greater degree of tissue degradation. Ruminal acidosis symptoms in calves appear similar to those in adult cattle, and the etiology of the disease seems to follow similar mechanisms. It is clear from this study that symptoms can be moderated by diet, but further research is needed to determine whether symptoms can be nutritionally prevented or whether calves that experience ruminal acidosis are more susceptible to the disease as adults.
(Copyright © 2020 American Dairy Science Association. Published by Elsevier Inc. All rights reserved.)
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