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Study on Myoelectrical Activity of Isthmus and Uterus in Laying-hen

Ding Jinanping Zhou Jie Shi Jiangbin (Department of Animal Husbandry and Veterinary Science) Xu Guansun (Anhui Traditional Chinese Medicine)  
Myoelectrical activity of isthmus and uterus in laying-hen was investigated in vivo by means of implanting bipolar eletrodes under the tuniea serosa. The results are as follows: 1) There axe 3 types of isthmus and uterus myoelectrical activity: slow waves, single and burst spike potential. 2) There was no difference of the frequency between laying—hen and pre—laying—hen, but the amplitude of slow waves showed significant differences; Single spike potential was found in both laying—hen and pre—laying—hen. However, the number of spike per minute and gross amplitude per minute presented significant differences (p0.05, p0.01) and even more significant for laying—hen. Burst spike potential was found in laying—hen only. 3) In the same condition, the frequency and amplitude of slow waves simultancously recorded showed no significant difference (p0.05) between isthmus and uterus. The number of spike per minute and gross amplitude per minute of spike potential on uterus were significantly high (p0.05) as compared with those of isthmus. 4) The amplitude of spike potential showed regular changes during ovulation. Myoelectrical activity was stronger when egg went into fimbrias tube; The minimum activity occured when egg was transported into albumen secreting part; The activity increasd when egg went into inthmus; The maximum activity appeared during parturition, then decreased thereafter. The changes paralleled between isthmus and uterus (r=0.956). 5) Cauded migrating of burst spike potential was recorded during laying.
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