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Where to move them (or which paddock) is entirely up to you, and the forage in your pastures. Different paddocks will have forage plants coming at different stages. Targeting pastures or paddocks where grasses haven't quite headed out but are past the 3- or 4-leaf stage is ideal. Each year you begin grazing it's best to start in a different pasture or paddock than the year before, and graze different paddocks from the year before, never keeping to the same schedule as last year's grazing season. This is so that you allow different pastures opportunity to get ahead or reach a different physiological state than they would if they were grazed at the same time year after year. It's perfectly fine to allow some paddocks to get ahead and reach flowering and/or seed set before either grazing, or mowing. Some of your pastures may have a variety of legumes that need to be allowed to set seed before next grazing, all to maintain a healthy stand. These range from clovers, sainfoin and cicer milkvetch to alfalfa, lespedeza and birds-foot trefoil. Depending on the grazing intensity and targeted utilization rate, you should look for things like how much is forage is left behind (basically height-wise, as well as leaf area) from what was there just before the animals were turned in, and ask yourself if you grazed too heavy or possibly too light. One important thing to remember is that it's very easy to allow animals to consume too much grass and not leave enough grass behind. So if you think you may have grazed too light, check plant height before and after to be sure with your grazing or yard stick. Basically, determining how much to leave behind is an art that requires a lot of observation, trial and error, and practice. There is no perfect one-size-fits-all way to judge how much to take versus how much to leave behind. This will help you determine how long your rest period may need to be. Your initial estimated rest period may be too short, or too long; it all depends on how slowly or quickly the plants recover from grazing.
Move your animals as regularly as you have already chosen. Make observations of the plants left behind after every move. Check the grazed pastures or paddocks once every few days to a week or so to note how plants are coming back.