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

Långtidsstudier av benmineralförändringar under olika laktationer hos svensk mjölkboskap

Acta Veterinaria Scandinavica volume 26, pages 49–60 (1985)Cite this article

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.

Sammanfattning

Förändringarna i benmineralmängden (BMC) studerades kontinuerligt under de forstå 4 laktationerna melian juli 1977 och februari 1982 på totalt 103 svenska mjölkkor av olika ras och uppfödnings-intensitet. Benmineralmängden mättes i två svanskotor med hjälp av dikromatisk foton absorptiometri. Trots stora individuella variationer följde förändringarna i benmineralmängd ett typiskt mönster under laktationerna med höga värden under sintiden och låga värden efter kalvningen och i mitten av laktationen. Sambandet mellan kroppsvikt och uppmätt benmineralmängd diskuteras. Förändringarna i benmineralmängd var mer uttalade under första laktationen jämfört med de efterföljande laktationerna, vilket kan tyda på ett mer metaboliskt aktivt skelett hos yngre kor. Ingen skillnad beträffande benmineralförändringar sågs i denna studie mellan friska kor och kor som drabbades av puerperal pares.

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Authors and Affiliations

  1. Department of Animal Hygiene, Faculty of Veterinary Medicine and the Department of Animal Breeding and Genetics, Faculty of Agricultural Sciences, Swedish University of Agricultural Sciences, Uppsala, Sweden

    Torbjörn Holmberg, Britt Berglund, Gunilla Ral & Birgitta Åhman

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  1. Torbjörn Holmberg
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  2. Britt Berglund
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  3. Gunilla Ral
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  4. Birgitta Åhman
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Holmberg, T., Berglund, B., Ral, G. et al. Long Term Studies on Bone Mineral Changes During Different Lactations in Swedish Dairy Cattle. Acta Vet Scand 26, 49–60 (1985). https://doi.org/10.1186/BF03546563

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Acta Veterinaria Scandinavica

ISSN: 1751-0147