Bermudez A J, Swayne D E, Squires M W, Radin M J
Department of Poultry Science, Ohio State University, Columbus 43210.
Avian Dis. 1993 Apr-Jun;37(2):274-83.
Two groups of 100 white leghorn hens were fed rations either supplemented or deficient in vitamin A for 32 weeks. At the conclusion of the study, vitamin A-supplemented hens laying normally were also compared with a group of vitamin A-supplemented hens in a state of low egg production. Mean egg retinol equivalents (microgram retinol/g egg yolk), egg production, and hatchability in the vitamin A-deficient group were decreased significantly by 4, 20, and 28 weeks, respectively, after beginning treatment. The ovaries of vitamin A-deficient chickens had increased numbers of atretic follicles compared with the ovaries of vitamin A-supplemented hens (20, 24, 28, and 32 weeks), and these atretic follicles contained moderate to severe hemorrhage. Hemorrhage was located either uniformly throughout the follicle or more commonly between the detached granulosa cell layer and the theca interna. Hemorrhagic follicles were uncommon in both vitamin A-supplemented hens and low-production vitamin A-supplemented hens.
将两组各100只白来航母鸡分别喂食添加或缺乏维生素A的日粮，持续32周。在研究结束时，还将正常产蛋的补充维生素A的母鸡与一组产蛋量低的补充维生素A的母鸡进行了比较。在开始治疗后，维生素A缺乏组的平均鸡蛋视黄醇当量（微克视黄醇/克蛋黄）、产蛋量和孵化率分别在4周、20周和28周时显著下降。与补充维生素A的母鸡（20周、24周、28周和32周）的卵巢相比，维生素A缺乏的鸡的卵巢中闭锁卵泡数量增加，并且这些闭锁卵泡含有中度至重度出血。出血要么均匀地分布在整个卵泡中，要么更常见于分离的颗粒细胞层和卵泡内膜之间。在补充维生素A的母鸡和产蛋量低的补充维生素A的母鸡中，出血性卵泡都不常见。
