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Questions and Answers
What is the typical length of the estrous cycle in bovine?
What is the typical length of the estrous cycle in bovine?
Which species has a zonary and endotheliochorial placenta?
Which species has a zonary and endotheliochorial placenta?
Which species is an induced ovulator and has a seasonally polyestrous estrous cycle?
Which species is an induced ovulator and has a seasonally polyestrous estrous cycle?
What type of placenta do swine have?
What type of placenta do swine have?
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How long does estrus last in goats?
How long does estrus last in goats?
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Study Notes
Reproductive Characteristics of Various Species
Canine (Dogs)
- Gestation length: 62-64 days
- Estrous cycle: Unseasonally monoestrous, cycles once every 6-7 months
- Estrus duration: 9 days
- Placentation type: Zonary and endotheliochorial
Feline (Cats)
- Gestation length: 65 days
- Estrous cycle: Seasonally polyestrous, induced ovulators
- Estrus duration: 6-7 days (range 1-10 days)
- Placentation type: Zonary and endotheliochorial
Swine (Pigs)
- Gestation length: 114 days
- Estrous cycle: Unseasonally polyestrous, cycles every 21 days
- Estrus duration: 2-3 days
- Notes: Guilt (young female pig) and sow (adult pig)
- Placentation type: Diffuse and epitheliochorial
Bovine (Cattle)
- Gestation length: 279 days (dairy), 292 days (beef)
- Estrous cycle: Unseasonally polyestrous, cycles every 21 days
- Placentation type: Cotyledonary and epitheliochorial
Equine (Horses)
- Gestation length: 335-342 days
- Estrous cycle: Seasonally polyestrous, estrus cycle lasts 7 days
- Placentation type: Diffuse and epitheliochorial
Goats
- Gestation length: 150 days
- Estrous cycle: Seasonally polyestrous, cycles every 21 days
- Estrus duration: 2-3 days
- Placentation type: Cotyledonary and epitheliochorial
Sheep
- Gestation length: 150 days
- Estrous cycle: Seasonally polyestrous, estrus cycle lasts 17 days
- Estrus duration: 1-2 days
- Placentation type: Cotyledonary and epitheliochorial
Chicken
- Gestation length: 21 days
- Note: No placenta!
Ferrets
- Gestation length: 41-42 days
- Estrous cycle: Seasonally polyestrous, induced ovulators
- Notes: Female ferret is called Jill (male is called Hob), pregnancy can be determined at 14 days by palpation or ultrasound
- Placentation type: not specified
Guinea Pigs
- Gestation length: 65-68 days
- No additional information provided
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Description
This quiz covers the gestation periods, estrous cycles, and placentation types of canines, felines, and swine. Understand the differences in their reproductive cycles and characteristics.
