Experiments were carried out in order to determine the effects of level and form of dietary zinc (Zn) on performance, health and digestibility in dairy cows and metabolism in vitro. In experiment 1, four concentrates vere formulated to provide cattle with recommended level of Zn in either an organic (Bioplex Zn; Alltech Inc., Nicholasville USA) or inorganic (zinc oxide (ZnO); Rumenco, Staffordshire, UK) form or 0.66 of the recommended level again in either form. By supplementing Zn at the recommended level with background levels in the basal diet taken into consideration, a reduction in SCC and milk amyloid A was observed compared to the lower level, whilst supplementing in an organic form at the recommended level increased milk yield. Experiment 2 used the same basal ration and concentrates as experiment 1 to assess the effects of level and form of Zn on digestion and apparent absorption.
| Identifer | oai:union.ndltd.org:bl.uk/oai:ethos.bl.uk:491837 |
| Date | January 2008 |
| Creators | Cope, Carolyn Mary |
| Publisher | University of Aberdeen |
| Source Sets | Ethos UK |
| Detected Language | English |
| Type | Electronic Thesis or Dissertation |
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