Veterinarski arhiv, Vol. 83 No. 3, 2013.
Izvorni znanstveni članak
The morphology of placentomes and formation of chorionic villous trees in West African Dwarf goats (Capra hircus).
Udensi M. Igwebuike
; Department of Veterianry Anatomy, University of Nigeria Nsukka, Nigeria
Daniel N. Ezeasor
; Department of Veterianry Anatomy, University of Nigeria Nsukka, Nigeria
Sažetak
Gravid uteri, harvested from 11 pregnant West African Dwarf (WAD) goats at different stages of gestation, were used to study the morphology of placentomes and the formation of chorionic villous trees in the placentomes. The results showed that the goats exhibited a polycotyledonary placenta, made up of randomly distributed concave placentomes. The number of placentomes in the placenta did not vary (P>0.05) with gestational age, but the average size of the placentomes increased linearly (R2 = 0.978; P<0.05) as pregnancy progressed. The indication is that the conceptus of WAD goats responds to the greater nutrient/metabolic demands of late pregnancy by increasing the size of placentomes but not the number of placentomes in the placenta. Histological observations revealed that primary chorionic villi were present in the superficial layers of the uterine caruncles, but were lacking in the subjacent (deep) caruncular tissue layers during the periimplantation period. Furthermore, complete apposition and attachment were observed between the chorionic villi and caruncular crypts at all stages during the formation of the placentomes. It was concluded that the caruncular crypts and chorionic villi appear to develop simultaneously in the placentomes of West African Dwarf goats.
Ključne riječi
cotyledonary placenta; placentome; chorionic viilli; caruncular crypt
Hrčak ID:
101907
URI
Datum izdavanja:
17.5.2013.
Posjeta: 2.687 *