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首页> 外文期刊>The Kasetsart Journal >Effects of Water Deprivation during the Prelaying Period on Eggshell Quality, Wet Droppings and Blood Physiology in Laying Hens
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Effects of Water Deprivation during the Prelaying Period on Eggshell Quality, Wet Droppings and Blood Physiology in Laying Hens

机译：蛋鸡预产期缺水对蛋鸡品质，湿粪和血液生理的影响

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The influence of water deprivation at the onset of lay on subsequent eggshell quality, fecal moisture content and blood physiology was investigated in ISA Brown pullets. Kidney and bone appearances were also determined at the end of the study. The pullets were randomly divided into 3 groups; control, dehydrated, and dehydrated+NH_4Cl groups. The birds in the control group were provided a layer diet with water at all times. At 20 weeks of age, drinking water supply in the dehydrated and dehydrated+NH_4Cl groups was removed completely for 48 hours whereas feed was available at all times. Thereafter, the water was provided until the end of the trial. The birds in the dehydrated+NH_4Cl group were fed on the control diet added with ammonium chloride (NH_4Cl) at a level of 1 % throughout the rehydration phase. Water deprivation for 2 days at the onset of lay did not affect eggshell quality throughout theexperimental period. An incidence of pooreggshell was observed in the dehydrated+NH_4Cl group as evidenced by reduced shell weight and shell thickness at 24 weeks of age (P < 0.05). During the 2 days of dehydration, fecal moisture contents were significantly reduced for the birds in the two groups of dehydration. However, the excreta moisture of the birds in these groups increased rapidly as the drinking water was returned and significantly greater than that of the control birds by 6 hours of water replenishment. On Week 8 of rehydration, the increase of the manure moisture was observed again for the dehydrated+NH_4Cl hens when compared with the control birds (P < 0.05). Interruption of available drinking water increased hematocrit values for the two groups of dehydration during 48 hours of water deprival. Hematocrit values of the hens in these groups, however, were rapidly decreased as the water was reintroduced and significantly reduced on Week 8 of rehydration for the dehydrated hens fed with the acidified diet. Water deprivation was associated with increases in the concentration of sodium in plasma whereas plasma pH was inconsistent and varied among the experimental groups. Decreased humerus weight was observed in the dehydrated+NH_4Cl hens necropsied at the end of the study.
机译：在ISA Brown母鸡中调查了产蛋开始时缺水对随后蛋壳质量，粪便水分含量和血液生理的影响。在研究结束时还确定了肾脏和骨骼的外观。母鸡随机分为3组。控制，脱水和脱水+ NH_4Cl基团。对照组中的鸟类始终要接受分层饮水。在20周龄时，脱水和脱水+ NH_4Cl组的饮用水供应在48小时内被完全清除，而饲料始终可用。此后，提供水直到试验结束。脱水+ NH_4Cl组的家禽在补液阶段整个饲喂对照日粮，添加氯化铵（NH_4Cl）含量为1％。产蛋后2天缺水并没有影响整个实验期间的蛋壳质量。在脱水+ NH_4Cl组中观察到了不良卵壳的发生，这通过24周龄时壳重和壳厚度的减少得以证明（P <0.05）。在脱水的两天内，两组脱水中的禽类的粪便水分含量显着降低。然而，随着饮用水的补充，这些组中禽类的排泄物水分迅速增加，并且补充水6小时后显着大于对照禽类。在补液的第8周，与对照组相比，脱水+ NH_4Cl母鸡的粪便水分再次增加（P <0.05）。在缺水的48小时内，可用饮用水的中断增加了两组脱水的血细胞比容值。但是，这些组中的母鸡的血细胞比容值随着水的重新引入而迅速降低，并且在补水的第8周时，用酸化饮食喂养的脱水母鸡的血细胞比容值显着降低。缺水与血浆中钠浓度的增加有关，而血浆pH值不一致且在实验组之间变化。在研究结束时，在尸检后的脱水+ NH_4Cl母鸡中观察到肱骨重量减少。

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