The use of beta-agonists in beef cattle production has been highly scrutinized following concerns of animal welfare, which has led to the removal of Zilmax from the market by the manufacturer.
Grass tetany, also known as grass staggers, magnesium tetany, hypomagnesemia, and wheat pasture poisoning, is a nutritional disorder caused by either 1) an inadequate amount of dietary Mg, or, 2) other mineral related factor that is preventing (antagonizing) dietary Mg from being properly absorbed or utilized.
Replacement heifers that have just reached puberty and started cycling may be vulnerable to any drastic change in feed intake. A small trial conducted at Oklahoma State University illustrates the impact that sudden severe reduction in energy intake can have on cycling activity in replacement heifers.
