Williams S N, Miles R D, Ouart M D, Campbell D R
Department of Poultry Science, University of Florida, Gainesville 32611.
Poult Sci. 1989 Apr;68(4):539-45. doi: 10.3382/ps.0680539.
Two trials were conducted to study the effects of high dietary Zn on tissue Zn accumulation and depletion in laying hens. Hens laying at approximately 60 to 70% were fed a diet containing 20 g Zn as ZnO/kg diet (as fed) for 4 days. For the remaining 18 days, hens were fed the same diet without the 20 g added Zn/kg diet. Ten hens were killed at initiation of the experiment (Day 0), and liver, kidney, and pancreas were obtained for Zn analysis. On Days 1, 2, 3, 4, 10, 16, and 22, similar samples were obtained from 10 hens. Feeding high Zn for 4 days caused a reduction in ovary and oviduct weight by Day 10. Liver, kidney and pancreas Zn concentrations increased approximately 10, 3, and 25-fold, respectively, in birds following 4 days of feeding the high Zn diets. The liver and kidney Zn concentrations returned to pretreatment concentrations within 18 days after the birds were fed the control diets (Day 22). The pancreas maintained higher Zn concentrations in comparison with the other tissues following withdrawal of the high Zn diet.
进行了两项试验以研究高日粮锌对蛋鸡组织锌积累和消耗的影响。产蛋率约为60%至70%的母鸡被饲喂一种日粮，其中每千克日粮含20克氧化锌形式的锌（按饲喂状态计），持续4天。在接下来的18天里，母鸡被饲喂相同的日粮，但每千克日粮不添加20克锌。在实验开始时（第0天）处死10只母鸡，获取肝脏、肾脏和胰腺用于锌分析。在第1、2、3、4、10、16和22天，从10只母鸡中获取类似样本。到第10天，饲喂高锌4天导致卵巢和输卵管重量减轻。在饲喂高锌日粮4天后，鸡的肝脏、肾脏和胰腺中的锌浓度分别增加了约10倍、3倍和25倍。在鸡被饲喂对照日粮（第22天）后的18天内，肝脏和肾脏中的锌浓度恢复到预处理浓度。与其他组织相比，在高锌日粮撤除后，胰腺维持较高的锌浓度。
