石粉粒度与饲喂时间对蛋壳质量及其超微结构的影响

Effect of Particle Size of Limestone and Feeding Time on Quality and Ultra Structure of Egg Shell

选用２８８只５６周龄种禽褐蛋鸡，随机分为６组，分别给予３种日粮处理，即在玉米一 豆粕型日粮中分别以２５％、５０％和７５％２ ５～３．２ｍｍ石粉与０．１～０ ．５ｍｍ石粉混合，２种饲喂 方式，即一种为２．５～３．２ｍｍ石粉与０．５～０．１ｍｍ石粉混合到日粮中全天饲喂；另将 ２．５～３．２ｍｍ石粉于每日下午４：００～４：３０单独加入槽中饲喂，试验期８周．结果表明：石粉粒度 与饲喂时间对蛋壳强度有显著影响（Ｐ＜０．０５），对破软蛋率及蛋壳乳头体直径与密度有极显著 影响（Ｐ＜０．０１）

288 56-wk- old brown egg layers were fed 3 kinds of particle size of limestone and 2 kind of feeding time. The result indicate the diet and feeding time had effect on egg strength and broken and soft egg shell ratio(P< 0. 05). It also indicated various size of limestone and feeding tame had effect on the density and diameter of mammillary knob(P<0. 01 ).