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Sustained-release boluses to supply trace elements and vitamins to calves

Sustained-release boluses to supply trace elements and vitamins to calves

Veterinary Journal 153(2): 221-224

Cylindrical rumen boluses of a size (55 mm length times 18 mm diameter, density 2.9 g cm-3) appropriate for ruminating calves over 75 kg liveweight were constructed. The mean daily nutrient releases from two rumen boluses measured in rumen-cannulated cows were 62 mg Cu, 0.56 mg Se, 1.08 mg Co, 1.14 mg I, 38 mg Mn and 55 mg Zn with vitamins 3140 IU A, 628 IU D-3 and 9 IU E. In a 123-day experiment with housed dairy calves given hay and a barley/soyabean meal mix, administration of two rumen boluses significantly increased plasma copper and blood glutathione peroxidase levels compared with unsupplemented control calves. There were similarly significant responses in a 143-day experiment with suckled beef-cross calves treated with two rumen boluses at grass. In both circumstances the basic diets provided inadequate allowances of both copper and selenium.

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Accession: 002973863

Download citation: RISBibTeXText

PMID: 12463408

DOI: 10.1016/s1090-0233(97)80043-3

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