![[Feedback]](/icons/banner/feedbackACT.gif){kind=icon}
![[For Subscribers]](/icons/banner/subscriberACT.gif){kind=icon}
![[Archive]](/icons/banner/archiveACT.gif){kind=icon}
![[Search]](/icons/banner/searchACT.gif){kind=icon}
![[Contents]](/icons/banner/tocACT.gif){kind=icon}
|
|
|
|
|
||
Department of Meat and Animal Science, University of Wisconsin-Madison, Madison, WI 53706
Seventy-two growing pigs were fed one of nine dietary treatments that provided a range of Ca (0.4%–1.2%) and P (0.4%–1.2%) levels arranged in a two-factor central composite design. Two pigs per treatment after either 5 (T5) or 10 (T10) wk and four pigs per treatment after 15 (T15) wk were slaughtered, and the femur (F) and third (MT3) and fourth (MT4) metatarsal bones were collected for evaluation of mechanical properties (force, stress and modulus of elasticity), ash weight (ASHW), percent ash (PASH) and bone mineral content (BMC) using photon absorptiometry. Stepwise regression analysis utilized to generate best-fit equations predicted that dietary Ca and P levels could reliably predict force (R2 = 0.83), ASHW (R2 = 0.93) and BMC (R2 = 0.89) of the MT3 bones but the prediction of force differed at the various time periods. Stress (R2 = 0.41), the modulus of elasticity (R2 = 0.29) and PASH (R2 = 0.17) were not reliably predicted by dietary mineral levels. The amount of force withstood by the MT3 bone could be reliably predicted by BMC (R2 = 0.90), but stress was not reliably predicted by BMC (R2 = 0.40) even if dietary Ca levels were considered. These results indicated that dietary Ca levels between 0.6% and 1.2% and dietary P levels between 0.6% and 0.8% did not adversely affect growth, efficiency or bone development. The BMC, as determined by photon absorptiometry, was not a reliable predictor of bone strength.
KEY WORDS: • swine • calcium • phosphorus • bone strength • age • bone mineral content
1 Dept. of Meat and Anim. Sci. Paper No. 101. Research supported by the College of Agricultural and Life Sciences, University of Wisconsin-Madison.
2 Presented in part at the 1985 Swine in Biomedical Research Symposium, College Park, MD.
Manuscript received 29 January 1986. Revision accepted 7 June 1986.
This article has been cited by other articles:
|
|
 |
|
  J. R. Hunt, C. D. Hunt, C. A. Zito, J. P. Idso, and L. K. Johnson Calcium Requirements of Growing Rats Based on Bone Mass, Structure, or Biomechanical Strength Are Similar J. Nutr., August 1, 2008; 138(8): 1462 - 1468. [Abstract] [Full Text] [PDF]
|
|
|
|
 |
|
 T. L. Veum and M. R. Ellersieck Effect of low doses of Aspergillus niger phytase on growth performance, bone strength, and nutrient absorption and excretion by growing and finishing swine fed corn-soybean meal diets deficient in available phosphorus and calcium J Anim Sci, April 1, 2008; 86(4): 858 - 870. [Abstract] [Full Text] [PDF]
|
|
|
|
 |
|
 W. K. Kim, L. M. Donalson, S. A. Bloomfield, H. A. Hogan, L. F. Kubena, D. J. Nisbet, and S. C. Ricke Molt Performance and Bone Density of Cortical, Medullary, and Cancellous Bone in Laying Hens During Feed Restriction or Alfalfa-Based Feed Molt Poult. Sci., September 1, 2007; 86(9): 1821 - 1830. [Abstract] [Full Text] [PDF]
|
|
|
|
|
|
T. L. Veum, D. R. Ledoux, and V. Raboy Low-phytate barley cultivars improve the utilization of phosphorus, calcium, nitrogen, energy, and dry matter in diets fed to young swine J Anim Sci, April 1, 2007; 85(4): 961 - 971. [Abstract] [Full Text] [PDF]
|
|
|
|
|
|
T. L. Veum, D. W. Bollinger, C. E. Buff, and M. R. Bedford A genetically engineered Escherichia coli phytase improves nutrient utilization, growth performance, and bone strength of young swine fed diets deficient in available phosphorus J Anim Sci, May 1, 2006; 84(5): 1147 - 1158. [Abstract] [Full Text] [PDF]
|
|
|
|
|
|
T. L. Veum, D. R. Ledoux, D. W. Bollinger, V. Raboy, and A. Cook Low-phytic acid barley improves calcium and phosphorus utilization and growth performance in growing pigs J Anim Sci, October 1, 2002; 80(10): 2663 - 2670. [Abstract] [Full Text] [PDF]
|
|
