Reproductive behario
7 important questions on Reproductive behario
What are the final prepartum steops of reproduction?
- Formation of a placenta
- Acquisition of the endocrine function of the placenta
- Initiation of parturition
What is a placenta?
It is a transient organ of metabolic interchange between conceptus and the dam. It is also a transient endocrine organ. The placenta is composed of a fetal component derived from the chorion and a meternal component derived from modifications of the uterine endomerium.
How are placentas classified?
Placentals are classified accoring to th distributionof chorionic villi on their surfaces, giving each placental type a distinct anatomical appearance.
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What are the four classifications of placentas?
- diffuse
- zonary
- discoid
- cotyledonary
The placenta produces hormones that can:
- stimulate ovarian function
- maintain pregnancy
- influence fetal growth
- stimulate mammary function
- assist in parturition
Why i progestrone obligatory for early embryonic cevelopment?
It provides the stmulus for elevated secretion by endometrail glands. Hihg progestron is also responsibel for the so-called progestrone block, that inhibits myometrial contractions.
What are the three major causes of dystocia?
- Excessive size of the fetus
- failure of proper fetal rotation
- multiple births in monotocous species
- both twins may be presented simoutaneuously
- the first fetus is positioned abnormally and therefore flocks the second
- the uterus becomes fatigued y difficult and sustained contractions
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