Where can I find clear and concise guidelines for nutritive requirements for sheep and cattle?

If you have a contact with your district LLS vet they can pass on some very valuable precise information, down to Calcium, and other mineral requirements. 

From our social media community:

• Grace Calder: https://www.feedinglivestock.vic.gov.au

For sheep, the feed budget table series produced by lifetime wool are a really good resource. You can get onto them through AWI.