Exam 2

Question 1

The gestation length for a mare is approximately

Answer 1

336 days

Question 2

Leydig cells housed in between the seminiferous tubules of the testes are responsible for:

Answer 2

testosterone production

Question 3

The gestation length for a ewe (a female sheep) is approximately

Answer 3

147 days

Question 4

What hormone is produced by the anterior pituitary and triggers ovulation and development of the corpus luteum?

Answer 4

LH ( luteinizing hormone )

Question 5

The _____ in the hen reproductive tract is responsible for formation of the shell and shell pigment.

Answer 5

Uterus

Question 6

What is the term for the “yellow body”, which is active tissue that develops on the ovary?

Answer 6

corpus luteum

Question 7

What stage of the estrous cycle involves the female not being receptive to the male, corpus luteum is present, and high progesterone levels?

Answer 7

diestrus

Question 8

Cows, sows, and mares have a _____ uterus type.

Answer 8

bicornuate

Question 9

What is the term for difficult birth?

Answer 9

dystocia

Question 10

The hormone responsible for the stimulation of milk “letdown” is

Answer 10

oxytocin

Question 11

The site pf semen deposition during artificial insemination of cattle is

Answer 11

the uterine body

Question 12

Some advantages of estrous synchronization are

Answer 12

closer calf seasons, less labor cost, and scheduled breeding times

Question 13

In the mating of two heterozygous (Bb) cattle what percentage of the offspring will be red?

Answer 13

25%

Question 14

The hormone that is produced by the corpus luteum on the ovary is called _____ (the pregnancy hormone)

Answer 14

progesterone

Question 15

The first milk that is produced after parturition that is high in antibodies is called

Answer 15

colostrum

Question 16

For cattle artificial insemination, straws of semen are stored/ preserved in

Answer 16

liquid nitrogen

Question 17

The hormone that is released on day 15 of the estrous to cause regression of the corpus luteum and brings the female into heat is called

Answer 17

prostaglandin

Question 18

The seminiferous tubules located within the testes are responsible for the production of what?

Answer 18

sperm cells

Question 19

If an animal has one dominant allele and one recessive allele for a given trait; they are considered

Answer 19

heterozygous (Bb)

Question 20

Who was the founder of modern genetics?

Answer 20

Gregor Mendel

Question 21

Who was given the name “Father of the Art of Animal Breeding” ?

Answer 21

Robert Bakewell

Question 22

What type of inheritance involves measurable trait that are strongly influenced by the environment?

Answer 22

Quantitative Inheritance

Question 23

What breeding system mates closely related individuals?

Answer 23

Inbreeding

Question 24

_____ is the term for an increase in productivity in the crossbred progeny above the average of breeds or lines that are crossed.

Answer 24

Heterosis

Question 25

Why are mules a sterile species cross?

Answer 25

Unpaired chromosomes and not enough homology