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Reproduction. Male. Male. http://trc.ucdavis.edu/mjguinan/apc100/modules/Reproductive/_topics.html. Role of the male. Produce ample amounts of viable sperm Willing and able to deliver semen (containing sperm) to female to AI. Anatomy of MALE. Paired TESTES Epididimyis Vas deferens

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Male

http://trc.ucdavis.edu/mjguinan/apc100/modules/Reproductive/_topics.html


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Role of the male

  • Produce ample amounts of viable sperm

  • Willing and able to deliver semen (containing sperm)

    • to female

    • to AI


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Anatomy of MALE

  • Paired TESTES

  • Epididimyis

  • Vas deferens

  • Penis

  • Scrotum

  • Accessory Sex Glands


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Scrotum

  • Testes descend from near kidney at or near birth

    • failure: monorchid or chryptorchid

  • Maintains temp 4-8° cooler than body


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Temp regulation in testes

  • External Cremaster muscle

    • contracts when cold, relaxes when warm

  • tunica dartos (smooth muscles in skin)

    • contract when cold

  • pampiniform plexus

    • heat exchanger in blood above testicle

    • esp. stallion & boar


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  • Sperm are produced continually in great numbers the testes under the metablic and hormonal support of sustentacular and interstitial cells (Sertoli’s cells).

    • Bull = 5 BILLION sperm per ejaculate

  • Regulated by FSH

  • Cells of Leydig secrete testosterone

    • Regulated by LH


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The mammalian male reproductive tract consists of the testes,

a duct system, and related glands.


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Testes & epididymis testes,

Sperm are produced in the testis and mature in the epididymis.


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Ductus deferans testes,(vas deferens)

The ductus deferens (vas deferens) propel sperm to the urethra

during ejaculation.



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Ureter testes,


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Ampulla testes,

The ampulla is a glandular region of the terminal portion of

the ductus deferens. It is absent in cats and pigs.


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Prostrate testes,

The prostate gland empties into the urethra.

It provides the bulk of seminal fluid in most species.


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Vestibular glands testes,(Seminal vessicles)

The vestibular glands vary greatly in size depending on the species.

They are absent in canines and felines.


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Bulbourethral gland testes,

The bulbourethral glands are present in the pig,

equine and bovine, but missing in the canine.



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Penis testes,

Varies by species - Horse: erectile tissue, blood engorgement,

Ram & boar: less erectile tissue. Sigmoid flexure.


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Dog penis testes,

Os penis

Urethra

Blood sinuses


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Pig penis testes,


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Testis testes,

Seminiferous tubules form the mass of the testes and are the sites of

spermatogenesis.


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Testis testes,

Head of

Epididymis

Tail of

Epididymis


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Spermatogonia testes,

The spermatogonia are the germ cells of the testis. Unlike

mamallian oogonia, they continue to divide throught life.


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Primary spermatocytes testes,

The spermatogenic cells--spermatogonia, primary spermatocytes,

secondary spermatocytes, spermatids and spermatozoa--represent

different cell stages in spermatogenesis.



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Sustenticular cells testes,

The outlines of sustentacular cells are not distinct. Maturing

spermatozoa are found embedded, head first, in the sustentacular

cells, which provide mechanical support, protection and possibly

nutrition for the developing spermatozoa.


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Spermatids testes,


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Basal lamina testes,


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Factors affecting sperm production testes,

  • Sexual maturity

  • Heredity

  • Underfeeding

  • Nutrients like Vitamin A, E, protein

  • Temperature

  • Testis size

  • Abnormalities


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Male Review testes,

  • Spermatogenesis occurs in the seminiferous tubules of the testes.

    • Sustentacular and interstitial cells aid the development of spermatogonia into spermatozoa with a nuclear head, mitochondria filled midpiece and a microtubule tail.


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