Case 2A - The ovarian cycle

16 important questions on Case 2A - The ovarian cycle

What is the period between two ovulations called?

An oestrous cycle

How long in days is each phase of the oestrous cycle for a cow?

  1. Prooestrous= 3-4 days
  2. Oestrous= 12-18 days
  3. Metoestrous= 3-4 days
  4. Dioestrus= 10-14 days

How long is each phase of the oestrus cycle in days for a mare?

  1. Prooestrous= 2-3 days
  2. Oestrous= 96-192 days
  3. Metoestrous= 2-3 days
  4. Dioestrous= 2-3 days
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How long is each phase of the oestrous cycle in days for a sow?


  1. Prooestrous= 3-4
  2. Oestrous= 24-72
  3. Metoestrous= 2-3
  4. Dioestrous= 11-13

How long is the oestrous cycle for an ewe (female sheep)

17 days

Time oestrous cycle mare

oestrous cycle :22 days
metooestrus: 2-3 days
dioestrus: 10-12 days
proestrus: 2-3 days
oestrus: 96-192 hours
ovulation: 24-48 hours before end of oestrus

Time oestrous cycle sow

oestrous cycle :21 days
metooestrus: 2-3 days
dioestrus: 11-13 days
proestrus: 3-4 days
oestrus: 24-72 hours
ovulation: at two thirds of oestrus.

What are the three types of ovarion cycles in bonefish and birds ?

1. All present oocytes mature simultaneously, no young oocytes are present in the ovary just before the mating season.
a. Often found in species that die after egg deposition (salmon).
2. Two developmental stages of oocytes are present during spawning. Ovary contains large mature oocytes and a large amount of small low yolk oocuytes.
a. Takes place in bone fish that egg deposition takes place once a year short period of time.
3. Oocyte development proceeds asynchronously. Ovary contains all phases of oocytes before the spawning period.
a. Spieceis have a long spawning period with more than one egg deposition.

How long does the formation of a chicken egg takes ?

26-26 hours

What happens in the transition from dioestrous to prooestrous?

In this period the regression of the corpora lutea take place.

Is the time at which a chicken lays its egg always the same ?

No it shifts every day 1-2 hours

How many types of ovarion cycles occur in bonefish?

3 types of ovarian cycles

How long after egg laying can another ovulation take place?

0.5 hours

What is a requirement for an ovulation in a chicken?

A Lh surge must be taken place 8 hours before

When does LH secretion takes place in the chicken?

In the dark only

When does chickens show a laying cycle?

In the spring

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