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 language | English (US) |
|---|---|
| Pages (from-to) | 502-514 |
| Number of pages | 13 |
| Journal | Journal of Animal Physiology and Animal Nutrition |
| Volume | 97 |
| Issue number | 3 |
| DOIs | |
| State | Published - Jun 1 2013 |
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All Science Journal Classification (ASJC) codes
- Food Animals
- Animal Science and Zoology
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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 journal › Article
TY - JOUR
T1 - Body phosphorus mobilization and deposition during lactation in dairy cows
AU - Elizondo Salazar, J. A.
AU - Ferguson, J. D.
AU - Beegle, Douglas Brian
AU - Remsburg, D. W.
AU - Wu, Z.
PY - 2013/6/1
Y1 - 2013/6/1
N2 - 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.
AB - 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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UR - http://www.scopus.com/inward/citedby.url?scp=84878121803&partnerID=8YFLogxK
U2 - 10.1111/j.1439-0396.2012.01291.x
DO - 10.1111/j.1439-0396.2012.01291.x
M3 - Article
C2 - 22452565
AN - SCOPUS:84878121803
VL - 97
SP - 502
EP - 514
JO - Journal of Animal Physiology and Animal Nutrition
JF - Journal of Animal Physiology and Animal Nutrition
SN - 0931-2439
IS - 3
ER -