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. 1985 Mar 1;26(1):49–60. doi: 10.1186/BF03546563

Long Term Studies on Bone Mineral Changes During Different Lactations in Swedish Dairy Cattle

Långtidsstudier av benmineralförändringar under olika laktationer hos svensk mjölkboskap

Torbjörn Holmberg 1,✉, Britt Berglund 1, Gunilla Ral 1, Birgitta Åhman 1
PMCID: PMC8202711  PMID: 4036752

Abstract

Changes in the bone mineral content (BMG) during the first 4 lactations were continuously studied between July 1977 and February 1982 in a total number of 103 dairy cows of different breeds and rearing intensities. The BMG was measured by dichromatic photon absorptiometry in 2 coccygeal vertebrae. Although great individual variations were found, the changes in BMG during the lactation followed a typical pattern with high values during the dry period and low values after calving and during mid-lactation. The influence of body weight on the BMC value is discussed. The changes in BMC were more accentuated during the first lactation, as compared to the subsequent lactations. This could indicate a metabolically more active skeleton in younger cows. In this study no difference in BMC pattern was observed between cows affected or not affected by parturient paresis.

Keywords: bone mineral, dairy cows, milk production, parturient paresis

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