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Whale reproduction
- 2. Odontoceti Mysticeti Beaked whales Sperm whales Dolphins Porpoises Belugas Narwhals Blue whales Bowhead whales Fin whales Gray whales Humpback whales Right whales
- 7. Beluga 40- 60 years Blue whale 70- 90 years Bowhead whale 100- 200 years Fin whale 60- 100 years Gray whale 50- 70 years Humpback whale 40- 100 years Narwhal 40- 60 years Sperm whale 60- 80 years
- 8. Narwhal
- 9. Blue whale
- 13. Cool polar regions Warm equatorial region Cool polar regions Warm equatorial region To breed To feed To give birth To feed Eg.: Humpback whales
- 15. Cool polar regions Warm equatorial region Cool polar regions Warm equatorial region To breed To feed To give birth To feed Winter Nurse calves for 6- 12 months Anoestrum for 6 months after weaning Therefore, they breed once every 2- 3 years
- 18. Breaching
- 20. Gray whales Sometimes, a male will support the female from beneath while she mates with another male
- 23. Blue whales 11- 12 months Bowhead whales 12- 16 months Gray whales 13.5 months Humpback whales 11- 12 months Right whales 12 months Sperm whales 16 months Belugas 14- 15 months Narwhals 10- 16 months
- 28. c - Chorion e - Endometrium
- 29. SPECIES LENGTH (m) WEIGHT (kg) Blue whales 7.6 5443- 7257 Bowhead whales 5 4536- 5443 Gray whales 4.6 907- 1361 Humpback whales 4.3 2268 Right whales 4.9- 5.8 5443- 6350 Sperm whales 4 907 Belugas 1.2- 1.5 45- 68 Narwhals 1.6 80 Size of the calf at birth depends on the species (1/4 cow’s length) *Females are larger at birth
- 32. THANKYOU!
Editor's Notes
- Females mature when they hit 11.7 m and males, 11.1 m Life span: Around 40- 100 years Average life expectancy: 30- 70 years (healthy, non endangered)
- S- shaped loop when retracted Guided by muscles
- Sperm retention due to no semen coagualtion (absence of seminal vesicles and bulbourethral) (semen coagulation to retain semen in vagina and help sperm motility towards uterus) Stimulates penis to promote ejaculation Endocervix- Inner lining of cervix
- Bowhead whale- Stay in the Arctics
- Wean when they are 7- 9 m long (Gray whales)
- Position body away to keep genital slit out of reach
- Heat runs- Humpbacks batter one another with fins Whale songs Deep, throaty, clicks, groans, etc. Travel long distances underwater to allow females to locate males May be a means of communication 30 Hz- 8 kHz (We hear best from 1- 5 kHz) Beaked whales- Scars, fractured beaks Pods are generally relaxed and friendly Blue whale males thrust penis into vulva while flying up and ejaculate
- Rarely observed Belly- to- belly: Gray whale Menage a trois: Gray whale Harbour porpoise: 2 kg testes (Wt.: <60 kg)
- Give birth close to the surface
- How long do they lactate? Adults stop growing when they are 40 years
- Gray whales may fight to the death