Repro 155 folliculogenesis

List 2 hormones that work together to cause follicular growth and maturation

LH and fsh

Species that will ovulate a primary follicle?

Mare

Indicate if the following germ cells are haploid or diploid in terms of chromosomal numbers.

​a) Oogonium​

​b) Zygote​

​c) Primary oocyte​

​d) Secondary oocyte

A) diploid
B) diploid
C) diploid
D)haploid

. In which stage of the follicles can a secondary oocyte be found?

Metaphase stage of meiotic 2

What structures from the graafian follicle are released when ovulation occurs?

Oocyte, zona pellucida, cumulus oophorus

What's the average length of survival for spermatoza and over for horses?

Sperm: 72-120hrs
Ova: 6-8hrs

Indicate the average length of gestation in the following farm animal species. (days)

Sheep 145
Swine 114
Cattle 279
Horses 340

List when placentation is usually completed in the following species.

Mare complete by 50-60
Cow complete by 42days

List 2 functions of amniotic fluid

Protection and prevention of adhesion

List two tissues, organ or system that develops from each of the listed germ cell layers.

Endoderm​ Digestive systems/ liver

​Mesoderm​ Muscle/Repro systems

​Ectoderm Sweat glands/CNS

List the 3 stages of Gestation and the important factors that are involved with its transition.

Zygote-> embryo->fetus
Ovum/zygote: [CLEAVAGE] cellular division without growth (mitotic)
Embryo: Gastrulation [3 layers: Ecotoderm, mesoderm, endoderm]
Fetal: called embryo until all essential organs formed

Which of the three layers of the placenta is on the outside that covers all of them

Corium

What's the average length of survival for spermatoza and over for sheep?

Sperm: 30-48hrs
Ova: 16-24hrs

Primary follicles are comprised of a primary oh site surrounded by two or more layers of granulosa cells (t/f)

False

Cows typically have two follicular waves during an estrous cycle(t/f)

True

Secondary oocytes, sides are haploid in terms of chromosomal number(t/f)

True

Luteinizing hormone is the hormone responsible for causing ovulation of ovarian follicles(t/f)

True

The lack of progesterone is directly involved with ovulation(t/f)

True

What provides nutrients to embryo

Fetal vessels

What's the average length of survival for spermatoza and over for cattle?

Sperm 24-48
Ova 8-12

What's the average length of survival for spermatoza and over for swine?

Sperm: 24-48
Ova 8-20