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WEEK 2
TOPIC:Â TERMS IN REPRODUCTION
SUB-TOPIC 1
The following are selected terminologies in the reproduction of animals. Ovulation oestrus cycle, heat period, signs of heat period, mating, gestation, parturition, lactation, colostrums and weaning.
Ovulation: This is the rupturing of the ovary wall(Graafian follicle) to lease mature eggs, ova, ovum into the fallopian tube in animals. It is under the influence of the pituitary gland hormone (Luteinizing hormone or oestrogen). It occurs in between or midway through oestrus cycle. It occurs when female animals are on heat or show a desire to be mated.
Time of ovulation in farm animals
Cow      10-14 hours after oestrus
Sow      24-36hours after oestrus
Ewe       20-24 hours after oestrus
Rabbit     Immediately after or during mating. Â
SUB-TOPIC 2
Oestrous cycle: This is the interval between the end of one heat period to the beginning of another. This is the period of time from the beginning of oestrus to the beginning of another. It is followed by a long period in which female animals will not show a desire to mate. It is under the influence of hormone called oestrogen.
The oestrus cycle varies among farm animals.
Cow                    20-21 days
Ewe                     17-21 days
Sow                     14-28 days
Doe(goat)Â Â Â Â Â Â Â Â Â Â Â 17-21 days
Doe(rabbit)Â Â Â Â Â Â Â Â spontaneous
Oestrus: this is a period of sexual receptivity in female, period when a female animal is willing to be mated by male.
Heat period: the heat or oestrus period is the time when the female animal shows signs of its readiness to mate. Heat period varies from one animal to another e.g
Cow          5-24 hours
Ewe          35-36 hours
Sow          40-48 hours
Doe (Goat) 40-50 hours
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