Hester P Y, Wilson E K
Poult Sci. 1986 Nov;65(11):2029-33. doi: 10.3382/ps.0652029.
Hens reared at densities of 344 and 516 cm2/bird produced significantly fewer hard-shelled (HS) and shell-less (SL) eggs than hens reared at a density of 1031 cm2/bird. Soft-shelled (SS) egg production was not affected by the density treatment. A decline in ovulation rate would account for the decrease in total hen-day production in response to the higher density treatments. To determine if the introduction of new cage mates would cause hens to lay fewer eggs with poorer shell quality, the performance of hens with visitors was compared with those with nonvisitors. Visitors were introduced monthly for 13 months. Visitors vs. nonvisitors showed no significant difference with regard to HS, SS, and SL egg production, feed efficiency, mortality, egg weight, and specific gravity.
每只母鸡饲养密度为344平方厘米和516平方厘米时，与每只母鸡饲养密度为1031平方厘米时相比，产硬壳（HS）蛋和无壳（SL）蛋的数量显著减少。软壳（SS）蛋的产量不受饲养密度处理的影响。排卵率下降可解释在较高饲养密度处理下母鸡日产蛋总量的减少。为了确定引入新的笼伴是否会导致母鸡产蛋量减少且蛋壳质量变差，将有访客的母鸡与无访客的母鸡的生产性能进行了比较。在13个月内每月引入访客。在硬壳蛋、软壳蛋和无壳蛋产量、饲料效率、死亡率、蛋重和比重方面，有访客组与无访客组之间没有显著差异。
