A note on changes in egg‐shell porosity with flock age and season during the first breeding cycle of domestic ducks
A note on changes in egg‐shell porosity with flock age and season during the first breeding cycle of domestic ducks
复制标题
家鸭第一个繁殖周期蛋壳孔隙度随鸡龄和季节变化的研究
DOI：
10.1080/00071668308416768
复制
发表时间：
1983
影响因子：
2
通讯作者：
S. Smith
中科院分区：
文献类型：
--
作者：
S. Tullett;S. Smith
1. — Changes in egg weight and egg‐shell porosity with flock age and season are presented for domestic duck flocks in their first laying cycle. 2. — The first eggs laid are of low weight and shell porosity but generally by the fifth week of lay both characteristics have increased to the values found in the mature flock. 3. —For mature flocks porosity decreases in the summer and the consequences of this are considered in relation to the observed decrease in hatch‐ability at this time.
