Techniques of breeding and management on laying ducks during laying period/TLRI

Brown Tsaiya laying ducks are given diets which are recommended by the Manual of Nutrient Requirement for Ducks (1988) during hatching to 8 weeks of age. A restriction feed containing 9.5% crude protein and 2,300 kcal/kg metabolizable energy during 8 to 21 weeks of age is given and laying diet is given thereafter. The vaccination management is given according to our SOP. Light regime of 16L : 8D and lighting intensity of 20 lux are given. Feed and water are provided ad libitam in the experiment. Three different crude protein levels (18, 20, 22%) and two metabolizable energy levels (2,750 and 2,950 kcal/kg) create a 3 x 2 factorial design experiment with six treatments. Each treatment has three replicates containing 20 ducks in each replicate. The experiment lasts from 24 to 52 weeks of age. Egg weight, egg shell breaking strength, laying yield and feed conversion ratio are recorded every four weeks. The results indicated that the level of crude protein and metabolizable energy in the diet had no significant effects on Tsaiya ducks’ daily feed intake and egg laying yield, thus treatment with diet containing 22% crude protein and 2,750 kcal/kg metabolizable energy had highest egg laying performance. In the egg weights, post egg laying stage showed heavier egg weights than that of early stage. For feed conversion ratio, the results of all treatments were from 3.47 to 3.72 and no significant difference was found. The lowest egg production cost 59.98 NT$/kg was found in the diet containing 20% crude protein and metabolizable energy 2,750 kcal/kg treatment.