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Animal Science Exam 2
Terms in this set (34)
Used by producers to predict time of puberty in cattle:
Structure of the teste responsible for the production of sperm cells:
Structure of the teste responsible for the production of testosterone:
Regulates temperature of the teste:
Cremaster muscle in spermatic cord
Produces progesterone in an attempt to maintain pregnancy in the cow:
CL (corpus luteum)
Produces the vast majority of accessory fluids during ejaculation in the bull:
Serves as the site of fertilization in the reproductive tract of the cow:
Functions to "seal off" the inner most structures of the female reproductive tract, protecting the tract and/or the developing fetus:
The portion of the estrous cycle when there are no signs of estrus observed:
Stimulates the growth of egg or sperm cells:
FSH (follicle stimulating hormone)
Hormone that stimulates the release of a mature follicle from the ovary:
LH (lutenizing hormone)
Semen is most commonly packaged and stored in .5ml units called:
Name the hormones involved in parturition:
Name the behavioral signs of estrus in cattle:
Clear mucus often seen at estrus
First recorded research in A.I. was done in what year?
Name the most common technique used in A.I. of cattle:
Average length of estrous cycle in cattle:
What are CIDR's used for?
Used to bring them into heat
When entering a cow for A.I. the gun should be pointed in an:
First recorded embryo transfer was performed on what animal?
What hormone would be at high level in a pregnant cow:
Know the average life span of an egg and sperm cell in cattle:
Sperm- about 30 hours after ejaculation
Egg- 12 hours
What % of frozen cattle semen survives the thawing process?
What collection method in cattle yields the highest quantity and quality of semen?
A.V. (artificial vaginas), most common is electro stimulation
What is a SAG group of cattle?
Sexually active group
How do estrus synchronization products work?
By getting rid of progesterone and increasing FSH
How many days of FSH shots does a cow receive for an embryo transfer?
Know the 4 standards that a bull must obtain to pass a BSE (Breeding soundness evaluation) test:
Volume (at least 6ml/cc), Concentration (350 million ml/cc, thick), Motility (65%), Morphology (70% normal)
Know what is added to the semen (what is in the extender) and the function of each:
Food Source- Egg yolk/citrate
What is the most practical (in terms of speed and economics) to determine pregnancy in cattle?
What is the AM/PM rule?
The ideal time to inseminate cattle is on average 12 hours after the onset of standing heat. (If she is in heat in the morning, inseminate that evening)
know what the scrotal circumference in bulls can tell us:
Higher volume of seminiferous tubules & interstitial cells (larger scrotal circumference), High sperm count, High sex drive/libido, Predicts age of puberty of bulls daughters, Bulls with a larger scrotal circumference produce more fertile daughters. Criteria: 30 cm minimum at 12 months
Management tool that can be used to delay parturition in cattle to daylight hours:
Feed them late @ night
Days of gestation in cattle:
Recommended textbook explanations
Campbell Biology (AP Edition)
Cain, Jackson, Minorsky, Reece, Urry, Wasserman
Lehninger Principles of Biochemistry
David L Nelson, Michael M. Cox
Lisa A. Urry, Michael L. Cain, Peter V Minorsky, Steven A. Wasserman
Modern Biology: Student Edition
Janet L. Hopson, Postlethwait
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