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Morphological Study of Yak Placenta During Gestation

Author: Liu
Tutor: YuSiJiu
School: Gansu Agricultural University
Course: Clinical Veterinary Medicine
Keywords: Yak Gestational Placenta Placenta sudden Uterine gland Microstructure Ultrastructure Histomorphometry
CLC: S823.85
Type: Master's thesis
Year: 2010
Downloads: 40
Quote: 0
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Abstract


Carried out the following experiment in order to clarify the morphological characteristics of yak placenta and its related functions, the area between pregnancy yak placenta sudden tissue morphological variation as well as pregnancy yak caruncle uterine gland morphological variation, this study and the results: (1) acquisition of 151 to 180 days of gestation yak placental tissue by light microscopy, histochemistry, transmission electron microscopy and scanning electron microscopy observation. Yak Placenta gross anatomy and organizational structure characteristics with other cattle, there are some obvious differences. Yak Placenta sudden sessile, dome-shaped, chorionic extended complex of primary, secondary and tertiary villi branching, and the crypt is fitted below the placenta sudden straight parent board; trophoblast epithelial mainly by mononuclear trophoblast cells and trophoblast giant cells, which have a different type of conjugate function, has strong secretion of neutral and acidic sugar cytoplasm visible in the rough endoplasmic reticulum, well developed Golgi complex secretory granules and other organelles and unique; mononuclear trophoblast cells and crypt epithelial cell microvilli connections and basement membrane at a layer of sugar conjugate distribution, the visible organelles such as mitochondria and vesicles in the cytoplasm, but sugar-free conjugate the presence. Histomorphometry method (2) the use of the 31 pregnancy yak placenta sudden gross anatomy and histological data were measured, and the statistical analysis. The study found that no significant change in total yak placenta during pregnancy projecting, the null angle placenta projecting quantity was significantly less than the progesterone angle; placenta projecting average size is significantly increased, but decreased slightly at 211 d, except gestational lt; 61 d addition to the development of the placenta sudden pregnancy angle was significantly different from the empty corner, placenta sudden longer, wider and thicker; yak placenta sudden fetal villi and maternal caruncle endometrial body density with time to pregnancy growth increases and reductions small, while the fetal villous surface density does not significantly change, dual-core cell body density first increased, decreased, maternal and fetal pyknotic cell body density obvious changes; yak placenta sudden, caruncle uterine endometrium and dual-core cell of the average total volume , as well as the the fetal villi average total surface area significantly increased slightly decreased 211 d of pregnancy, the average total volume of fetal of fluff, maternal and fetal pyknotic cells increased with the growth of time to pregnancy; yak placenta sudden, three kinds shape. (3) the use of pregnancy the yak caruncle zone uterine gland histomorphometry 31 histological data were measured, and statistical analysis. The study found that, in addition to pregnancy 151 ~ 180 d, area between yak caruncle uterine glandular epithelium significantly lower height growth as the pregnancy time; Uterine the duct perimeter and area significantly increased bulk density; between different pregnancy stages The difference was very significant, and the surface density of no significant difference; addition to pregnancy of 151 ~~ 180 d, distorted duct and tubular duct proportion with the growth of time to pregnancy, respectively, very significant increases or decreases, the proportion of endocrine glands tube in pregnancy during, the yak caruncle between District nested duct exists.

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CLC: > Agricultural Sciences > Livestock, animal medicine,hunting,silkworm,bee > Livestock > Cow > Variety > Yak
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