昼夜节律性温度变化对蛋鸡血钙浓度及其pH值的影响

Effect on Blood Calcium Concentration and pH in Hens under Cyclic Temperature Changes

选用40周龄艾维因父母代向种母鸡24只，设适温（13～23℃）和高温（25～38℃）两个处理，测定了母鸡在蛋壳钙沉积期间血钙（Ca2+）和总钙（TCa）浓度及pH值的变化。结果表明，在不同的环境温度下，母鸡血Ca2+和TCa浓度的变化规律各不相同，当母鸡适应了昼夜节律性变化的高温环境时，用于蛋壳钙沉积的有效钙供应量不会减少（P＜0．05），高温组母鸡血液pH值显著高于适温组（P＜0．05），且高温引起蛋壳品质下降。

24 Avein broiler breeding hens at age of 40 weeks were used to determine changes in blood concentration of ionized calcium(Ca2+) and total calcium (TCa) and PH related to egg cycle and temperature. Two ranges of the normal and high temperatures were simulated the cyclic diurnal scale between 13-23 ℃ and 25-38℃ The result shows that the changes are different in Ca2+ and Tea of blood during the egg cycle for hens under the two temperature ranges. The supply o f calcium available for egg shell deposition don't reduce when hens acclimate to high cyclic temperature (P＜0. 05). Blood pH is significantly affected by temperature (P＜0. 05).