Body phosphorus mobilization and deposition during lactation in dairy cows

J. A. Elizondo Salazar, J. D. Ferguson, Douglas Brian Beegle, D. W. Remsburg, Z. Wu

Research output: Contribution to journalArticle

10 Citations (Scopus)

Abstract

Dairy cow bone phosphorus (P) mobilization and deposition and their influence on P requirements were studied over the lactation cycle. Thirty Holsteins received a common diet during the dry period and one of the following three dietary treatments that varied in P percentage during the subsequent lactation (44weeks): (i) 0.36 throughout (constant P, 0.36-0.36-0.36), (ii) 0.36 for 30weeks then 0.29 for 14weeks (P changed once, 0.36-0.36-0.29), and (iii) 0.43 for 10weeks, 0.36 for 20weeks, and 0.29 for 14weeks (P changed twice, 0.43-0.36-0.29). Six P balance studies were conducted during the experiment, including one during the dry period and five along lactation, based on P intake, faecal P, urinary P and milk P, when appropriate. Blood samples were taken during balance to analyse bone formation (osteocalcin) and resorption (pyridinoline) marker concentrations and rib biopsies performed to determine bone P content. Phosphorus balance was negative during weeks -4 to -1 relative to lactation for all groups and remained negative for cows fed 0.36% P during weeks 1-5, but showed a positive value for cows that received 0.43% P. The balance was close to zero for all groups at weeks 19-23 and showed a clear retention during weeks 38-42; by the end of lactation, cows re-stored most of the P mobilized earlier. The pattern in P balance was consistent with changes in blood bone metabolism marker concentrations, rib bone P content, and faecal and urinary P concentrations over the experiment, indicating that cows, irrespective of the dietary P treatments received, mobilized P from bone during the late dry period when fed a low-Ca diet and early lactation, and re-stored P in late lactation. This dynamic of P metabolism can have important implications for dietary P requirements and ration formulations.

Original languageEnglish (US)
Pages (from-to)502-514
Number of pages13
JournalJournal of Animal Physiology and Animal Nutrition
Volume97
Issue number3
DOIs
StatePublished - Jun 1 2013

Fingerprint

Lactation
Phosphorus
dairy cows
lactation
dry period (lactation)
phosphorus
bones
cows
Bone and Bones
ribs
Ribs
bone metabolism
osteocalcin
balance studies
late lactation
blood
resorption
early lactation
bone formation
Diet

All Science Journal Classification (ASJC) codes

  • Food Animals
  • Animal Science and Zoology

Cite this

Elizondo Salazar, J. A. ; Ferguson, J. D. ; Beegle, Douglas Brian ; Remsburg, D. W. ; Wu, Z. / Body phosphorus mobilization and deposition during lactation in dairy cows. In: Journal of Animal Physiology and Animal Nutrition. 2013 ; Vol. 97, No. 3. pp. 502-514.
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abstract = "Dairy cow bone phosphorus (P) mobilization and deposition and their influence on P requirements were studied over the lactation cycle. Thirty Holsteins received a common diet during the dry period and one of the following three dietary treatments that varied in P percentage during the subsequent lactation (44weeks): (i) 0.36 throughout (constant P, 0.36-0.36-0.36), (ii) 0.36 for 30weeks then 0.29 for 14weeks (P changed once, 0.36-0.36-0.29), and (iii) 0.43 for 10weeks, 0.36 for 20weeks, and 0.29 for 14weeks (P changed twice, 0.43-0.36-0.29). Six P balance studies were conducted during the experiment, including one during the dry period and five along lactation, based on P intake, faecal P, urinary P and milk P, when appropriate. Blood samples were taken during balance to analyse bone formation (osteocalcin) and resorption (pyridinoline) marker concentrations and rib biopsies performed to determine bone P content. Phosphorus balance was negative during weeks -4 to -1 relative to lactation for all groups and remained negative for cows fed 0.36{\%} P during weeks 1-5, but showed a positive value for cows that received 0.43{\%} P. The balance was close to zero for all groups at weeks 19-23 and showed a clear retention during weeks 38-42; by the end of lactation, cows re-stored most of the P mobilized earlier. The pattern in P balance was consistent with changes in blood bone metabolism marker concentrations, rib bone P content, and faecal and urinary P concentrations over the experiment, indicating that cows, irrespective of the dietary P treatments received, mobilized P from bone during the late dry period when fed a low-Ca diet and early lactation, and re-stored P in late lactation. This dynamic of P metabolism can have important implications for dietary P requirements and ration formulations.",
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Body phosphorus mobilization and deposition during lactation in dairy cows. / Elizondo Salazar, J. A.; Ferguson, J. D.; Beegle, Douglas Brian; Remsburg, D. W.; Wu, Z.

In: Journal of Animal Physiology and Animal Nutrition, Vol. 97, No. 3, 01.06.2013, p. 502-514.

Research output: Contribution to journalArticle

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