Abstract
The bone mineral content in two coccygeal vertebrae of 16 cows of Swedish Red and White Breed was measured with dichromatic photon absorptiometry during the period nine weeks prepartum to one week postpartum. For eight weeks before calving eight cows received 37 g Ca and 50 g P/day and the other eight, 76 g Ca and 50 g P/day. The mean bone mineral changes of the cows on the low Ca ration did not change. The cows on the high Ca ration had a slight increase (4 %) in bone mineral content to some days before calving. The postpartum bone mineral changes were, however, lower than the one prepartum. There was no significant difference between the mean bone mineral changes of the two groups.
Keywords: absorptiometry, bone mineral measurement, calcium metabolism, cattle, gamma ray source, phosphorus
Sammanfattning
Benmineralinnehållet i två svanskotor hos 16 mjölkkor av SRB-ras mättes med dikromatisk foton absorptionsteknik under perioden 9 veckor pre partum — 1 vecka post partum.
Under 8 veckor före kalvningen erhöll 8 kor 37 g Ga och 50 g P och de andra 8, 76 g Ga och 50 g P/dag.
Hos korna med låg Ga-utfodring förändrades ej benmineralinnehållet. De med hög Ga-utfodring ökade däremot sitt benmineralinnehåll fram till dagarna före kalvningen med 4 %, därefter skedde en minskning. Skillnaden mellan de två grupperna var dock ej signifikant.
Undersökningen visade att benmineralinnehållet ej går att minska under senare delen av dräktigheten (sinperioden) om utfodringen av Ga är 37 g/dag. För att ernå en sänkning av benmineralinnehållet måste Ca-givan ytterligare sänkas vilket torde vara svårt under praktiska utfodringsbetingelser i Sverige.
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