Question

chapter #5 test review - animal science
be able to match the following vocabulary words with their definitions
diestrus testosterone zona pellucida vitelline block
stallion estrus gestation corpus luteum (cl)
yellow body at the site of the egg release
the mating cycle of an animal
barrier surrounding the egg. must be penetrated by sperm
process preventing any more sperm entering z. pelucida
pregnancy time of an animal
hormone critical to normal development of sperm cells
an intact male horse
period of mating inactivity in animals
know how many days the normal estrus cycle for
swine ____
cattle ____
horses ____
know what part of the reproductive system seals off the uterus after pregnancy to guard against bacteria ____
know which animal that we have studied that has
the longest gestation period ____
and how long it is ____
know what \foal heat\ is ____
know 4 stages of estrus
____
____
____
____
the visible part of the female reproductive tract is called ____
fertilization takes place in ____
the average gestation period of a lamb is ____

Explanation:

1. Yellow body at the site of the egg release: Corpus luteum (CL) forms after ovulation at the site where the egg was released.
2. The mating cycle of an animal: Estrus is the period when an animal is sexually receptive and mates.
3. Barrier surrounding the egg, must be penetrated by sperm: Zona pellucida is a glycoprotein - rich extracellular matrix around the egg.
4. Process preventing any more sperm entering z. Pellucida: Vitelline Block occurs after the first sperm penetrates to prevent polyspermy.
5. Pregnancy time of an animal: Gestation is the duration from fertilization to birth.
6. Hormone critical to normal development of sperm cells: Testosterone is a male sex - hormone important for sperm development.
7. An intact male horse: A stallion is an adult male horse that has not been castrated.
8. Period of mating inactivity in animals: Diestrus is a phase in the estrous cycle where the animal is not in heat.
9. Normal estrus cycle days: Swine: 21 days; Cattle: 21 days; Horses: 21 days.
10. Part of the reproductive system that seals off the uterus after pregnancy to guard against bacteria: Cervix closes and forms a mucus plug to protect the uterus.
11. Animal with longest gestation period: Elephants have one of the longest gestation periods, about 22 months.
12. FoaI heat: It is the first estrus cycle in a mare after foaling, usually occurring 5 - 10 days after giving birth.
13. 4 stages of estrus: Proestrus (pre - heat, preparing for estrus), Estrus (heat, sexual receptivity), Metestrus (post - heat, regression of the corpus luteum if no pregnancy), Diestrus (resting phase).
14. Visible part of the female reproductive tract: Vulva is the external part of the female reproductive tract.
15. Fertilization takes place in: Oviduct (fallopian tube in humans, also called uterine tube in animals), where the egg and sperm meet and fertilization occurs.
16. Average gestation period of a lamb: Approximately 145 - 155 days.

Answer:

1. Corpus luteum (CL)
2. Estrus
3. Zona pellucida
4. Vitelline Block
5. Gestation
6. Testosterone
7. Stallion
8. Diestrus
9. Swine: 21 days; Cattle: 21 days; Horses: 21 days
10. Cervix
11. Elephants; about 22 months
12. The first estrus cycle in a mare after foaling, usually 5 - 10 days after giving birth
13. Proestrus, Estrus, Metestrus, Diestrus
14. Vulva
15. Oviduct
16. Approximately 145 - 155 days