Case 2A; sperm
20 important questions on Case 2A; sperm
What is an oestrous cycle?
- 4 phases:
1. Prooestrus
2. Oestrus
3. Metoestrus
4. Dioestrus
When is puberty complete in males and females?
- Female: the first ovulation associated with externally visible estrous symptoms and typical estrous behaviour
With regard to the development of embryos into new individuals, there are 3 types of animals that can be distinguised
2. Oviparous
3. Ovoviviparous
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What can you tell me about the birth process in viviparous (mammels)
- problems can arise (case of cow and ewe) like the wrong position of the foetus or a too high birthweight in relation to the pelvic dimensions of the mother
- calves and lambs come head first, with the head lying on the forwardly stretched front legs
- piglets can be born head first or tail first
In days, what is the duration of the oestrus cycle for cows, ewe, mare, sow?
ewe: 17
mare: 22
sow: 21
In days, what is the duration of the DIOESTRUS for cows, ewe, mare, sows?
ewe: 10-12
mare: 10-12
sow: 11-13
In hours, what is the duration of the OESTRUS for cows, ewe, mare, sows?
ewe: 24-36
mare: 96-192
sows: 24-72
When is the ovulation for cows, ewe, mare, cows?
ewe: last par of oestrus
mare: 24-48 hours before end of oestrus
sows: at two-third of oestrus
What can you tell me about the ovarian cycle in chickens?
- 30 mins after laying the egg, the next ovulation takes place + at this point the chicken cackles
-> but only if an LH-surge by the pituitary has taken place 8 hours before
- LH secretion only takes place in the dark
What is the (1) volume ejaculate (ml), (2) concentration (sperm cells per ml ejaculate), and (3) the number of sperm cells per AI-dose for a STALLION?
(2) 0.04-3.0
(3) 500
What is the (1) volume ejaculate (ml), (2) concentration (sperm cells per ml ejaculate), and (3) the number of sperm cells per AI-dose for a BOAR?
(2) 0.05-0.40
(3) 1500
When do chickens lay their first egg?
When do cattle have their first estrus?
- in the tropics at an age of 2-5 years (poor nutritional status)
When do pigs have their first estrus?
What is (1) the gestation length (days) + (2) birth weight (kg) of CATTLE?
(2) 40
What is (1) the gestation length (days) + (2) birth weight (kg) of SHEEP?
(2) 4
What is (1) the gestation length (days) + (2) birth weight (kg) of PIG?
(2) 1.3
What is (1) the gestation length (days) + (2) birth weight (kg) of HORSE?
(2) 45 (mare of ~500kg)
When does a chick hatch + what is their birth weight?
The fertile life span of sperm cells in the female sex of a horse is about how long?
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