Colorado Agriscience Curriculum Animal Science Unit 4 Reproduction

Colorado Agriscience Curriculum Animal Science Unit 4 – Reproduction and Genetics Lesson 2 - Male Reproductive Anatomy

(A. S. Repro. 1. TM. A) Diagram 1 Taylor, Robert E. , Scientific Farm Animal Production, 4 th ed. 2

(A. S. Repro. 1. TM. B) Diagram 2 Taylor, Robert E. , Scientific Farm Animal Production, 4 th ed. 3

(A. S. Repro. 1. TM. C) Labels Vesicular Gland Penis Glandular Part of Vas Deferens Ureter Prostate Gland Urinary Bladder Rectum Vas. Deferens Bulbourethral Gland Sigmiod Flexure Bulbospongiosus Prepuital Divirticulum Ischiocavernosus Muscle Testicles Retractor Penis Muscle Kidneys Epididymis Vas Deferens Testis Ureters Scrotum Cloaca 4

(A. S. Repro. 1. TM. D) Male Reproductive Parts of a Boar Taylor, Robert E. , Scientific Farm Animal Production, 4 th ed. 5

(A. S. Repro. 1. TM. E) Male Reproductive Parts of a Rooster Taylor, Robert E. , Scientific Farm Animal Production, 4 th ed 6

(A. S. Repro. 1. TM. F) Levels of Organization Within an Organism • • Cells – Building block of both unicellular and multicellular organisms. Tissues- A group of cells functioning together to perform an activity. Organs- Groups of two or more tissues that function together. Organ Systems- Cooperation among organs makes life function within an organism efficient. 7

(A. S. Repro. 1. TM. G) Male Organs of Reproduction and Their Functions – – – – The testicles produce the sperm cells that fertilize the female’s egg. The sperm are produced in the seminiferous tubules within the testicles. Testosterone is produced here. Testosterone is the hormone that makes the appearance and behavior of a male masculine. The epididymis – This is where the sperm are stored from the testicle to mature. The scrotum – The scrotum is a sac that contains and protects the testicles. It regulates the temperature to be a few degrees lower than body temperature since sperm like this lower temperature. The vas deferens – The vas deferens transports the sperm from the epididymis to the urethra. The urethra – A large muscular canal extending from the urinary bladder. This is the pathway through with urine and semen are excreted. Accessory sex glands – The seminal vesicles, prostate, and bulbourethral glands are a part of this category. They primarily add to the semen fluid to provide health and nutrition to the sperm. The penis – The organ of copulation. It is characterized by its spongy, erectile tissue. It provides the passage way for urine and semen. 8

(A. S. Repro. 1. TM. H) Differences in the Poultry Male Reproductive Organs – The testes are contained in the body cavity. – Each vas deferens opens into small papillae, which are located in the cloacal wall. – Male fowl have no penis but have a copulatory organ. 9