Abstract

The results of the survey with 280-day-old and older cross Hisex-White chickens that underwent complex surgery and were implanted with pancreatic duct fistulas (four heads) allowed for the ascertaining of insufficient pancreatic enzyme activities at egg laying. Within the experiments, the pancreatic enzyme activities were measured at a 30-min interval, observing the oviposition before feeding and 30 min and 150 min after feed uptake. The activity of amylaze decreased by 52.2, 55.6, and 46.0%, respectively, while protease activity decreased by 33.3, 51.1, and 47.5%, respectively, and lipase activity decrease comprised 73.0, 61.7, and 47.5%, respectively, when compared to that in the reference period. The oviposition process is apparently predominant for egg-laying hens, which can suppress releasing the pancreatic enzymes in the preprandial and postprandial periods at the level of the diencephalon (hypothalamus), where the centers for regulating the pancreatic secretion and the reproductive function are located. Temporary decreases in the enzyme activities at the time of laying an egg are compensated by increase in their activities during the subsequent days without oviposition. Thus, activities of amylase, protease, and lipase increased by 28.0% (p < 0.05), 4.36-fold (p < 0.05), and by 34.2% (p < 0.05), respectively, when compared to that in the reference period. This ensures a high metabolic rate in the laying hens.

中文翻译：

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产蛋母鸡排卵时胰腺外分泌功能的抑制

摘要

对280日龄和大龄杂交Hesex-White杂交鸡进行调查的结果，这些鸡经过复杂的手术并植入了胰管瘘（四头），可以确定产蛋时胰腺酶活性不足。在实验中，每隔30分钟测量一次胰酶活性，观察进食前以及进食后30分钟和150分钟的产卵情况。与之相比，淀粉酶活性分别降低了52.2％，55.6％和46.0％，而蛋白酶活性分别降低了33.3％，51.1％和47.5％，脂肪酶活性分别降低了73.0％，61.7％和47.5％。在参考期内。产卵过程显然是产卵母鸡的主要过程，它可以在餐前和餐后水平的中脑（下丘脑）水平抑制胰腺酶的释放，而中脑是调节胰腺分泌和生殖功能的中心。产卵时酶活性的暂时下降可通过随后几天不产卵的酶活性的增加来补偿。因此，淀粉酶，蛋白酶和脂肪酶的活性增加了28.0％（与参考期间相比，p <0.05），4.36倍（p <0.05）和34.2％（p <0.05）。这确保了蛋鸡的新陈代谢率高。