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A low Dietary Cation-Anion Difference precalving and calcium supplementation post-calving increase plasma calcium but not milk production in a pasture-based system

Citation

Roche, JR and Dalley, DE and Grainger, C and Rath, M and O'Mara, F, A low Dietary Cation-Anion Difference precalving and calcium supplementation post-calving increase plasma calcium but not milk production in a pasture-based system, Journal of Dairy Science, 86, (8) pp. 2658-2666. ISSN 0022-0302 (2003) [Refereed Article]

DOI: doi:10.3168/jds.S0022-0302(03)73861-2

Abstract

It was hypothesized that a reduction in the dietary cation-anion difference (DCAD) before calving, combined with an increase in Ca intake after calving, would reduce the incidence of periparturient hypocalcaemia and increase milk production in pasture-based dairy cows. Cows (n = 40) were assigned to one of two DCAD levels before calving (i.e., +7 and +50 mEq/100 g). Each group was then assigned to one of two dietary Ca concentrations after calving (i.e., 1.0 and 0.7%) in a 2 x 2 factorial design. The lower DCAD resulted in a nonrespiratory reduction in systemic pH as indicated by a lower urine pH. This acidosis resulted in an increased concentration of Ca in urine before calving. The lower precalving DCAD helped prevent the decline in blood Ca caused by the onset of lactation, even though blood Ca concentration was lower before calving compared with cows receiving a high DCAD. Supplementation of cows with Ca after calving increased plasma Ca concentration on the day of calving and during the subsequent 14 d. Milk production was not affected by pre- or post-calving treatments.

Item Details

Item Type:Refereed Article
Research Division:Agricultural and Veterinary Sciences
Research Group:Animal Production
Research Field:Animal Nutrition
Objective Division:Animal Production and Animal Primary Products
Objective Group:Livestock Raising
Objective Field:Dairy Cattle
Author:Roche, JR (Dr John Roche)
ID Code:41267
Year Published:2003
Web of Science® Times Cited:16
Deposited By:Agricultural Science
Deposited On:2007-10-22
Last Modified:2007-10-22
Downloads:0

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