I'll also add that you don't decide when she gets in-foal. You try like hell with lights, meds, teasers, and a good experienced breeding shed manager to get her in-foal at the right time. There are things like follicles involved which are parts of a horse I don't think they use for racing. Other factors, would include her inner bits working well, how well the previous birth went, how late in the year it is, getting on the particular studs calendar, and if you are shipping the recent foal as well (weather), etc.
For a top mare I would think that late May is as late as you would go and you would never breed her to a lesser stallion simply because of the date. Most stud farms stay open later in the year because of demand. But you can bet Juddmonte isn't going to be breeding Toussaud in June. They'd prefer to skip the year, let her rest and get January foal by whichever top stallion they choose. You make very educated guesses as to which lines will cross well and you stick to them. If you own a top mare, you are not at all concerned with the stud fee.
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