What are the feed restriction methods during the growing period of laying ducks?

Feed restriction during the growing period of laying ducks is used to control body weight, avoid premature laying, make the age at first egg uniform, produce large eggs, prolong the duration of the peak laying period, and reduce the incidence of disease and mortality during the laying period. However, feed restriction does not mean feeding corn; there are three methods: quantitative restriction, qualitative restriction, and time restriction, that is, limiting feed intake, controlling the nutrient concentration of the feed, and controlling the number of feedings or the feeding time.