ASCI-351 Lab Information

Information from Papers Completed during class

Testis

produce spermatozoa and synthesize testosterone

Epididymis

long coiled tube at the back of each testicle, where sperm mature, are stored, and then transported when needed

Ductus Deferens

a muscular tube that moves sperm from epididymis to be expelled from body

Ampulla

widened end of ductus deferens that serves as a holding and transportation area for sperm to prepare them from mixing with seminal fluids and ejaculation

Vesicular Gland (seminal vesicles)

paired glands behind bladder that produce a nutrient rich fluid that protects, nourishes, and helps transport sperm

prostate gland

produces a fluid that activates sperm, and helps semen liquify so sperm can swim

Bulbourethral Gland

produces a clear, lubricating, mucus-rich secretion

Urthera

dual-purpose passage for both excretion of urine and transportation of sperm

Retractor Penis Muscle

pulls nonerect, fibroelastic penis back, and helps maintain sigmoid flexure

Penis

primary repro organ ; used for copulation and to pass semen and urine

What are the differences between a bull and boars repro anatomy?

• position of testis would change

• no ampulla

• vesicular glands are bigger

What are the differences between a boar and stallions repro anatomy?

• position of testis moves

• stallion has ampulla

• spermatic cord = more narrow on boar

What are the differences between a stallion and a dogs repro anatomy?

• position of testis moves again

• in dogs they only have the prostate gland accessory

• have an OS penis

• prostate is larger

• dog has bulbospongiosus

What is the purpose of a vasectomy?

The purpose of a vasectomy is to cut or seal ductus deferens to stop sperm from traveling to the rest of the reproductive system

How/why might a vasectomy be used in livestock, such as rams?

Used in “teaser” rams to stimulate ewes, and helps with safety and control of animal to avoid unplanned pregnancies. Helps with teasing because ram is sexually active, but infertile.

What are the benefits of castration?

• reduced aggression

• improved meat quality

What are the considerations with the age of pigs or timing of castration in their species?

Castrated at 5-7 days for easier physical recovery, minimizing stress, and easier procedure, and after too long they get boar taint

Mediastinum (rete testis)

middle white part of the testis

Testicular parenchyma

the lobe part of the testis

What are the 4 main types of placentation in mammals?

• diffuse

• zonary

• discoid

• cotyledonary

An example of a domestic species that utilizes each type of placenta

• pig → diffuse

• ruminants → cotyledonary

• dogs & cats → zonary

• rodents → discoid

What is the name of the fetal-maternal unit of the placenta in cattle?

Placentome

What is the name of the maternal component?

Maternal Cotyledon

What is the name of the fetal component?

Fetal Cotyledon