Sustained-release boluses to supply trace elements and vitamins to calves
| Autor: | R. G. Hemingway, N. S. Ritchie, J.J. Parkins |
|---|---|
| Rok vydání: | 1997 |
| Předmět: |
medicine.medical_specialty
Rumen Nutritional Status chemistry.chemical_element Animal science Nutrient Internal medicine medicine Animals chemistry.chemical_classification Glutathione Peroxidase Meal General Veterinary Nutritional Support Glutathione peroxidase food and beverages Trace Elements Endocrinology Animals Newborn chemistry Delayed-Action Preparations Hay Cattle Animal Science and Zoology Copper Selenium |
| Zdroj: | The Veterinary Journal. 153:221-224 |
| ISSN: | 1090-0233 |
| DOI: | 10.1016/s1090-0233(97)80043-3 |
| Popis: | Summary Cylindrical rumen boluses of a size (55 mm length×18 mm diameter, density 2.9 g cm−3) appropriate forruminating 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 D3 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. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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