There are people who believe,putting vinegar in the breeding does drinking water will help produce more female offspring.Sex Determination depends on the combination of a x and a y chromosome that join at the time of breeding.Y for males,XX for females.From a medical point of view,I do not see how vinegar makes any difference.Personally I feel it is an old wives tale.I think it is more of a personal choice,if no harm is done to your goats health,and one feels more female offspring are being born,then no harm is done.I have heard of vinegar in goats drinking water for goats raised in dry and dusty places to help them breathe easier.