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Effect of a metabolically created systemic acidosis on calcium homeostasis and the diurnal variation in urine pH in the non-lactating pregnant dairy cow.
- Source :
-
The Journal of dairy research [J Dairy Res] 2007 Feb; Vol. 74 (1), pp. 34-9. Date of Electronic Publication: 2006 Sep 15. - Publication Year :
- 2007
-
Abstract
- Reducing the dietary cation-anion difference (DCAD) has been shown to be an effective means of preventing parturient paresis in confinement systems where cows are offered a total mixed ration containing DCAD-reducing mineral compounds (anionic salts). Such a supplementation strategy is not possible in cows being group fed forages precalving, and little is known about the effect of supplementing these cows with large amounts of anionic salts twice daily. Eight non-lactating, pregnant Holstein-Friesian cows were allocated to two levels of DCAD (-20 and +18 meq/100 g DM) for 24 d, with an intensive Ca balance undertaken in metabolism stalls following a 2-week acclimatization to diet. The basal diet was 3 kg DM of crushed barley and 7 kg DM of pasture-hay. Urine and faeces were collected separately, weighed daily for 5 d and analysed for Ca content. Urinary Ca, creatinine and hydroxyproline concentration and plasma Ca concentration were determined during the period of the balance study. The diurnal pattern in urine and rumen pH was determined over 2 d. Decreasing DCAD reduced (P<0.001) the pH of urine, and increased (P<0.05) Ca absorption. Plasma Ca concentration was not affected by DCAD, and DCAD did not affect the output of urinary hydroxyproline, a marker of bone resorption. Twice-daily supplementation of anionic salts was sufficient to reduce the pH of blood and increase gastrointestinal Ca absorption. There was no diurnal variation in the pH of urine, suggesting that time of sampling to determine efficacy of DCAD in reducing systemic pH was not important.
- Subjects :
- Acidosis metabolism
Ammonium Chloride administration & dosage
Animal Feed
Animal Nutritional Physiological Phenomena
Animals
Anions
Cations
Diet veterinary
Dietary Supplements
Female
Homeostasis
Hydrogen-Ion Concentration
Lactation
Magnesium Chloride administration & dosage
Magnesium Oxide administration & dosage
Pregnancy
Urine
Acid-Base Equilibrium drug effects
Acidosis veterinary
Calcium metabolism
Cattle physiology
Circadian Rhythm physiology
Subjects
Details
- Language :
- English
- ISSN :
- 0022-0299
- Volume :
- 74
- Issue :
- 1
- Database :
- MEDLINE
- Journal :
- The Journal of dairy research
- Publication Type :
- Academic Journal
- Accession number :
- 16978431
- Full Text :
- https://doi.org/10.1017/S0022029906002123