|
|
||||||||
1 Department of Animal Science, Michigan State University, East Lansing 48824
2 USDA-ARS, National Animal Disease Center, Ames, IA 50010
Corresponding author: David. K. Beede; e-mail: beede{at}msu.edu.
Our objective was to compare the effects of different prepartum dietary phosphorus concentrations on periparturient metabolism and performance. Forty-two late pregnant multiparous Holstein cows were fed 0.21, 0.31, or 0.44% P (dry basis) for 4 wk before expected calving. After parturition, all cows were fed a common lactation diet (0.40% P). In the prepartum period, cows fed 0.21% P had lower blood serum P concentrations compared with cows fed 0.31 or 0.44% P. However, serum P concentrations of all cows were within the normal range (4 to 8 mg/dL) until the day of calving when average concentrations dropped below 4 mg/dL. From 3 to 14 d postpartum, serum P of cows fed 0.21% P was greater than that of cows fed 0.31 or 0.44% P. No cows presented with or were treated for clinical hypophosphatemia in the periparturient period. Total serum Ca was lower before calving through 2 d postpartum for cows fed 0.44% P compared with those fed 0.21 or 0.31%. Prepartum dietary P treatments did not alter blood osteocalcin, hydroxyproline, and deoxypyridinoline, indicators of bone metabolism, or concentrations of parathyroid hormone or 1,25-dihydroxyvitamin D3. Energy-corrected milk yield and milk composition (first 28 d of lactation) were not affected by prepartum dietary P concentrations. It is concluded that feeding 0.21% P (34 g of P/cow daily) prepartum is adequate for periparturient multiparous Holstein cows with high metabolic demands and genetic potential for milk production. No adverse effects on periparturient health, dry matter intake, or 28-d lactation performance resulted.
Key Words: phosphorus requirement periparturient cow serum phosphorus
Abbreviation key: 1,25(OH)2D3 = 1,25-dihydroxyvitamin D3, BEB = base excess, DPD = deoxypyridinoline, ECD = expected calving date, ECM = energy-corrected milk, iCa = ionized calcium, OC = osteocalcin, OHP = hydroxyproline, PTH = parathyroid hormone
This article has been cited by other articles:
![]() |
N. M. Esser, P. C. Hoffman, W. K. Coblentz, M. W. Orth, and K. A. Weigel The effect of dietary phosphorus on bone development in dairy heifers J Dairy Sci, April 1, 2009; 92(4): 1741 - 1749. [Abstract] [Full Text] [PDF] |
||||
![]() |
M. S. Taylor, K. F. Knowlton, M. L. McGilliard, W. S. Swecker, J. D. Ferguson, Z. Wu, and M. D. Hanigan Dietary calcium has little effect on mineral balance and bone mineral metabolism through twenty weeks of lactation in Holstein cows J Dairy Sci, January 1, 2009; 92(1): 223 - 237. [Abstract] [Full Text] [PDF] |
||||
![]() |
I. K. Mullarky, W. A. Wark, M. Dickenson, S. Martin, C. S. Petersson-Wolfe, and K. F. Knowlton Short communication: Analysis of immune function in lactating dairy cows fed diets varying in phosphorus content J Dairy Sci, January 1, 2009; 92(1): 365 - 368. [Abstract] [Full Text] [PDF] |
||||
| HOME | HELP | FEEDBACK | SUBSCRIPTIONS | ARCHIVE | SEARCH | TABLE OF CONTENTS |