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Alternative rib bone biopsy measurements to estimate changes in skeletal mineral reserves in cattle

Dixon, R. M., Coates, D. B., Mayer, R. J. and Miller, C. P. (2018) Alternative rib bone biopsy measurements to estimate changes in skeletal mineral reserves in cattle. animal . pp. 1-8. ISSN 1751-7311

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Article Link(s): https://doi.org/10.1017/S175173111800068X

Publisher URL: https://www.cambridge.org/core/article/alternative-rib-bone-biopsy-measurements-to-estimate-changes-in-skeletal-mineral-reserves-in-cattle/32BCFAB628C12D720DFBCA407C870D9F

Abstract

Rib bone biopsy samples are often used to estimate changes in skeletal mineral reserves in cattle but differences in sampling procedures and the bone measurements reported often make interpretation and comparisons among experiments difficult. ‘Full-core’ rib bone biopsy samples, which included the external cortical bone, internal cortical bone and trabecular bone (CBext, CBint and Trab, respectively), were obtained from cattle known to be in phosphorus (P) adequate (Padeq) or severely P-deficient (Pdefic) status. Experiments 1 and 2 examined growing steers and Experiment 3 mature breeder cows. The thickness of cortical bone, specific gravity (SG), and the amount and concentration of ash and P per unit fresh bone volume, differed among CBext, CBint and Trab bone. P concentration (mg/cc) was closely correlated with both SG and ash concentrations (pooled data, r=0.99). Thickness of external cortical bone (CBText) was correlated with full-core P concentration (FC-Pconc) (pooled data, r=0.87). However, an index, the amount of P in CBext per unit surface area of CBext (PSACB; mg P/mm2), was more closely correlated with the FC-Pconc (pooled data, FC-Pconc=37.0+146×PSACB; n=42, r=0.94, RSD=7.7). Results for measured or estimated FC-Pconc in 10 published studies with cattle in various physiological states and expected to be Padeq or in various degrees of Pdefic status were collated and the ranges of FC-Pconc indicative of P adequacy and P deficiency for various classes of cattle were evaluated. FC-Pconc was generally in the range 130 to 170 and 100 to 120 mg/cc fresh bone in Padeq mature cows and young growing cattle, respectively. In conclusion, the FC-Pconc could be estimated accurately from biopsy samples of CBext. This allows comparisons between studies where full-core or only CBext biopsy samples of rib bone have been obtained to estimate changes in the skeletal P status of cattle and facilitates evaluation of the P status of cattle.

Item Type:Article
Business groups:Animal Science
Keywords:P deficiency P adequacy cortical bone thickness bone mineral concentration P status
Subjects:Science > Physiology > Animal biochemistry
Animal culture > Cattle
Veterinary medicine > Veterinary physical medicine
Deposited On:20 Nov 2018 03:29
Last Modified:20 Nov 2018 03:29

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