Pregnant female reproductive physiology quiz

WIKIQUIZ

Questions reviewed by:

Peter G.G. Jackson BVM&S, MA, DVM&S, FRCVS
David Kilroy MVB CVMA MRCVS

1

What is the length of gestation in the sow?

2

What is the length of gestation in the cow?

3

What is the length of gestation in the ewe?

4

What is the length of gestation in the mare?

5

Approximately how long does the second stage of parturition last in the mare?

	20 minutes
	30 minutes - 4 hours
	30 minutes - 2 hours
	6 hours
	3 hours
Please select an option Correct. In the mare, the foal should be delivered within approximately 20 minutes of the rupture of the allantochorion. If the second stage exceeds this time, then immediate obstetric intervention is recommended. WikiVet Article: parturition. Incorrect. The second stage of parturition takes between about 30 minutes to 4 hours in the cow. In the mare, the foal should be delivered within approximately 20 minutes of the rupture of the allantochorion. If the second stage exceeds this time, then immediate obstetric intervention is recommended. WikiVet Article: parturition. Incorrect. The second stage of parturition takes between about 30 minutes to 2 hours in the ewe. In the mare, the foal should be delivered within approximately 20 minutes of the rupture of the allantochorion. If the second stage exceeds this time, then immediate obstetric intervention is recommended. WikiVet Article: parturition. Incorrect. The second stage of parturition takes around 6 hours in the bitch. In the mare, the foal should be delivered within approximately 20 minutes of the rupture of the allantochorion. If the second stage exceeds this time, then immediate obstetric intervention is recommended. WikiVet Article: parturition. Incorrect. The second stage of parturition takes approximately 3 hours in the sow. In the mare, the foal should be delivered within approximately 20 minutes of the rupture of the allantochorion. If the second stage exceeds this time, then immediate obstetric intervention is recommended. WikiVet Article: parturition.

6

What is the bovine maternal recognition of pregnancy factor?

	Unidentified
	Prolactin
	Interferon τ
	Progesterone
	Oestrogen
Please select an option Incorrect. In the mare, the conceptus does produce proteins to effect the recognition of pregnancy, but specific roles are unknown. Cattle blastocysts produce a small protein called bovine interferon tau (BIFN-τ)from day 13-21 after ovulation. It binds to the uterine endometrium and inhibits the synthesis of oxytocin receptors. As a result, there is no production of the luteolytic factor PGF2α and the corpus luteum is maintained. WikiVet Article: maternal recognition of pregnancy. Incorrect. The lifespan of the corpora lutea in a pregnant queen is extended to ~60 days by the action of pituitary prolactin. There is no need for a conventional 'maternal recognition of pregnancy'. Cattle blastocysts produce a small protein called bovine interferon tau (BIFN-τ)from day 13-21 after ovulation. It binds to the uterine endometrium and inhibits the synthesis of oxytocin receptors. As a result, there is no production of the luteolytic factor PGF2α and the corpus luteum is maintained. WikiVet Article: maternal recognition of pregnancy. Correct! Cattle blastocysts produce a small protein called bovine interferon tau (BIFN-τ)from day 13-21 after ovulation. It binds to the uterine endometrium and inhibits the synthesis of oxytocin receptors. As a result, there is no production of the luteolytic factor PGF2α and the corpus luteum is maintained. WikiVet Article: maternal recognition of pregnancy. Incorrect. Cattle blastocysts produce a small protein called bovine interferon tau (BIFN-τ)from day 13-21 after ovulation. It binds to the uterine endometrium and inhibits the synthesis of oxytocin receptors. As a result, there is no production of the luteolytic factor PGF2α and the corpus luteum is maintained. WikiVet Article: maternal recognition of pregnancy. Incorrect. The pig conceptus produces oestradiol as the signal for maternal recognition of pregnancy. Cattle blastocysts produce a small protein called bovine interferon tau (BIFN-τ)from day 13-21 after ovulation. It binds to the uterine endometrium and inhibits the synthesis of oxytocin receptors. As a result, there is no production of the luteolytic factor PGF2α and the corpus luteum is maintained. WikiVet Article: maternal recognition of pregnancy.

Pregnant female reproductive physiology quiz/ 9

7

For which domestic species is the corpus luteum the principal source of progesterone throughout the whole pregnancy?

	Cat
	Sheep
	Guinea pig
	Horse
	Pig
Please select an option Incorrect. The corpus luteum is the principal source of progesterone for 79% of the queen's pregnancy and during the remaining 21%, the placenta is the principal source. The corpus luteum is the principal source of progesterone for 100% of the sow's pregnancy. WikiVet Article: endocrine control of parturition. Incorrect. The corpus luteum is the principal source of progesterone for 37% of the ewe's pregnancy and during the remaining 63%, the placenta is the principal source. The corpus luteum is the principal source of progesterone for 100% of the sow's pregnancy. WikiVet Article: endocrine control of parturition. Incorrect. The guinea pig depends on placental progesterone during late pregnancy. The corpus luteum is the principal source of progesterone for 100% of the sow's pregnancy. WikiVet Article: endocrine control of parturition. Incorrect. The corpus luteum and accessory CL's is the principal source of progesterone for 61% of the mare's pregnancy and during the remaining 39%, the placenta is the principal source. The corpus luteum is the principal source of progesterone for 100% of the sow's pregnancy. WikiVet Article: endocrine control of parturition. Correct! The corpus luteum is the principal source of progesterone for 100% of the sow's pregnancy. WikiVet Article: endocrine control of parturition.

8

What is the most practical and reliable way of diagnosing pregnancy in an alpaca which has been served over 28 days previously?

	Transabdominal ultrasound scan
	Rectal exam
	Blood progesterone concentration
	Non return to oestrus
	Rejection behaviour
Please select an option Correct! Ultrasound scanning is the most reliable method of diagnosing pregnancy and can be highly accurate particularly after 28 days. However, around 10% of established pregnancies fail, so a positive scan will not guarantee live cria. WikiVet Article: Alpaca pregnancy diagnosis. Incorrect. This is impractical for smaller females or for veterinarians who don't have very small hands and it will cause undesirable stress to the female. Transabdominal ultrasound scanning is the most reliable method of diagnosing pregnancy and can be highly accurate particularly after 28 days. However, around 10% of established pregnancies fail, so a positive scan will not guarantee live cria. WikiVet Article: Alpaca pregnancy diagnosis. Incorrect. The level of progesterone required to maintain pregnancy varies, in fact cria have been born to dams with very low plasma progesterone concentrations. This variability makes blood tests unreliable. Transabdominal ultrasound scanning is the most reliable method of diagnosing pregnancy and can be highly accurate particularly after 28 days. However, around 10% of established pregnancies fail, so a positive scan will not guarantee live cria. WikiVet Article: Alpaca pregnancy diagnosis. Incorrect. The proportion of females displaying strong oestrus behaviour is usually small and not all the females will show all these signs so this is unreliable. Transabdominal ultrasound scanning is the most reliable method of diagnosing pregnancy and can be highly accurate particularly after 28 days. However, around 10% of established pregnancies fail, so a positive scan will not guarantee live cria. WikiVet Article: Alpaca pregnancy diagnosis. Incorrect. Rejection of the male usually indicates that conception may have taken place but it is not very reliable because if the female had a persistent corpus luteum they will also reject the male. Transabdominal ultrasound scanning is the most reliable method of diagnosing pregnancy and can be highly accurate particularly after 28 days. However, around 10% of established pregnancies fail, so a positive scan will not guarantee live cria. WikiVet Article: Alpaca pregnancy diagnosis.