1 / 10

Trace Mineral Requirements

Learn about trace mineral requirements in livestock diets, with a focus on copper sensitivity in sheep compared to cattle or horses. Avoid feeding mineral supplements meant for other animals. Follow example calculations to assess copper supply in the diet accurately.

williamdkennedy
Download Presentation

Trace Mineral Requirements

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Trace Mineral Requirements

  2. Mineral Requirements • Given as concentration required in the total diet DM • Includes all the ingredients the animal is consuming

  3. Mineral Requirements • Sheep are more sensitive to Cu toxicity than are cattle or horses • Do not feed a mineral supplement formulated for cattle or horses to sheep

  4. Example Calculation • A cow is consuming: • 30 lbs of alfalfa/grass hay (90% DM; 7 ppm Cu) • 4 oz of commercial trace mineral mix (97% DM; 500 ppm Cu)

  5. Calculate Cu Supply – Hay • Hay: 30 lbs x 0.90 = 27 lbs DM 27 lbs DM x 0.454 kg/lb = 12.26 kg DM 12.26 kg DM x 7 ppm (or 7 mg/kg) = 85.8 mg Cu from hay

  6. Calculate Cu Supply – TM mix • Mineral mix: 4 oz x 0.97 = 3.9 oz DM 3.9 oz DM x 28 g/oz = 109.2 g DM 109.2 g DM /1,000 = 0.109 kg DM 0.109 kg x 500 ppm (or 500 mg/kg) = 54.5 mg Cu from mineral mix

  7. Calculate Cu Supply – Total • Total Cu in the diet: 85.8 mg + 54.5 mg = 140.3 mg • Total DM intake by cow: 12.26 kg hay + 0.109 kg mineral mix = 12.37 kg • 140.3 mg Cu/12.37 kg DM intake = 11.3 mg/kg Cu (or 11.3 ppm Cu)

  8. Trace Mineral Requirements

  9. Evaluate Cu Supply • If “look at” Cu analysis of hay: 7 ppm vs. 10-15 ppm requirement Wrongly conclude DEFICIENT • If “look at” Cu on supplement tag: 500 ppm vs. 100 ppm maximum Wrongly conclude TOXIC

More Related