H. Paczoskaeliasiewicz et al., CHANGES OF HISTAMINE CONCENTRATION IN CHICKEN OVIDUCT DURING THE EGG-LAYING CYCLE, Journal of veterinary medicine. Series A, 45(2), 1998, pp. 69-73
This study was undertaken to determine histamine concentration in chic
ken oviductal parts (infundibulum, magnum, isthmus and shell gland) in
relation to the egg location within the oviduct and ovulation. The ex
periment was performed on Hisex Brown laying hens with regular sequenc
es of at least four eggs. Ovulation occurred within 5-15 min of ovipos
ition oi the previous egg In the series. Histamine was determined spec
trofluorometrically in the following stages of the egg-laying cycle: d
uring c(2) oviposition; 0.5 h, 6.5 h, 12.5 h and 18.5 h after c(2) ovi
position; and during c(3) oviposition. Irrespective of the egg formati
on stage histamine concentration in the examined oviductal parts was a
rranged in the following order: infundibulum > magnum > isthmus > shel
l gland. During the egg-laying cycle histamine concentration significa
ntly changed. During oviposition, i.e. just before ovulation of the ne
xt egg in the series, histamine concentration significantly increased
in the infundibulum while 6.5 h after oviposition, i.e. about 1.5 h of
the egg stay in the shell gland, there was a significant increase in
histamine concentration both in th infundibulum and the shell gland. I
n the magnum histamine concentration was elevated when the ovum entere
d the segment, i.e. 0.5 h after oviposition. There were no changes in
histamine concentration in the isthmus. It is suggested that histamine
participates in the local events taking place in the hen oviduct duri
ng the egg formation cycle.