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Questions and Answers
What is the main purpose of Maternal Recognition of Pregnancy strategies?
What is the main purpose of Maternal Recognition of Pregnancy strategies?
Which factor secreted by the bovine conceptus inhibits ovarian function?
Which factor secreted by the bovine conceptus inhibits ovarian function?
In a nonpregnant cyclic cow, what hormone induces pulsatile secretion of PGF2ɑ?
In a nonpregnant cyclic cow, what hormone induces pulsatile secretion of PGF2ɑ?
What effect does binding of oxytocin have on the endometrium?
What effect does binding of oxytocin have on the endometrium?
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Which is a role of elongating conceptus in the process of Maternal Recognition of Pregnancy?
Which is a role of elongating conceptus in the process of Maternal Recognition of Pregnancy?
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What occurs once the bovine conceptus secretes IFNT?
What occurs once the bovine conceptus secretes IFNT?
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What is the day of pregnancy when implantation starts in bitches?
What is the day of pregnancy when implantation starts in bitches?
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Why is maternal recognition of pregnancy not required according to the text?
Why is maternal recognition of pregnancy not required according to the text?
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What event occurs on Day 21 of pregnancy according to the text?
What event occurs on Day 21 of pregnancy according to the text?
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In which animals does implantation start earlier, bitches or queens?
In which animals does implantation start earlier, bitches or queens?
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What is one reason for the similarity in the duration of the luteal phase between nonpregnant cycles and during pregnancy?
What is one reason for the similarity in the duration of the luteal phase between nonpregnant cycles and during pregnancy?
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Why is it important to understand the crosstalk between the developing conceptus and the endometrium?
Why is it important to understand the crosstalk between the developing conceptus and the endometrium?
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What effect does IFNT have on oxytocin receptors in the endometrium during late diestrus?
What effect does IFNT have on oxytocin receptors in the endometrium during late diestrus?
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What is the consequence of IFNT blocking the upregulation of oxytocin receptors in the endometrium?
What is the consequence of IFNT blocking the upregulation of oxytocin receptors in the endometrium?
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What does maternal recognition of pregnancy in ruminants involve blocking?
What does maternal recognition of pregnancy in ruminants involve blocking?
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In the context of maternal immune system during pregnancy, what is the paradox mentioned?
In the context of maternal immune system during pregnancy, what is the paradox mentioned?
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During early embryo development, what structure is involved in elongating the conceptus in the endometrium?
During early embryo development, what structure is involved in elongating the conceptus in the endometrium?
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What type of molecules are included in histotroph, which is involved in conceptus development?
What type of molecules are included in histotroph, which is involved in conceptus development?
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Study Notes
Maternal Recognition of Pregnancy Strategies
- Maternal recognition of pregnancy involves the developing conceptus signaling its presence to prevent luteolysis and maintain the corpus luteum and progesterone secretion.
- In cattle, the elongating conceptus causes the secretion of proteins from uterine glands, which stimulates the synthesis of PGFaa, and prevents luteolysis.
Mechanism of Maternal Recognition in Ruminants
- The conceptus produces IFNT, which blocks the upregulation of oxytocin receptors in the endometrium at late diestrus.
- This prevents the pulsatile secretion of PGF2α by the endometrium, maintaining the corpus luteum and progesterone secretion.
Comparison of Maternal Recognition in Different Species
- In companion animals (bitches and queens), maternal recognition of pregnancy is not required, and the duration of the luteal phase is similar between nonpregnant cycles and during pregnancy.
- Implantation starts on Day 18 in bitches and Day 14 in queens.
Development of the Conceptus
- In cattle, the conceptus elongates, and on Day 21 of pregnancy, it moves to the uterine horn, stimulating the synthesis of PGFaa.
- In sheep, implantation starts on Day 16, and in cattle, it starts on Day 20.
Crosstalk Between the Conceptus and Endometrium
- The developing conceptus and endometrium interact through the secretion of proteins and hormones, such as IFNT and PGFaa, to maintain pregnancy.
- The conceptus produces histotroph, a mixture of amino acids, proteins, saccharides, growth factors, lipids, minerals, ions, and vitamins, which supports its development.
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Description
Test your knowledge on the maternal recognition of pregnancy strategies observed in different species, where the developing conceptus signals its presence for the maintenance of the corpus luteum and sustained secretion of progesterone. Explore concepts from Dr. Roger V. Short's work on implantation and the secretion of IFNT by the bovine conceptus as discussed by Ealy and Yang.
