Exam 2 Flashcards
The gestation length for a mare is approximately
336 days
Leydig cells housed in between the seminiferous tubules of the testes are responsible for:
testosterone production
The gestation length for a ewe (a female sheep) is approximately
147 days
What hormone is produced by the anterior pituitary and triggers ovulation and development of the corpus luteum?
LH ( luteinizing hormone )
The _____ in the hen reproductive tract is responsible for formation of the shell and shell pigment.
Uterus
What is the term for the “yellow body”, which is active tissue that develops on the ovary?
corpus luteum
What stage of the estrous cycle involves the female not being receptive to the male, corpus luteum is present, and high progesterone levels?
diestrus
Cows, sows, and mares have a _____ uterus type.
bicornuate
What is the term for difficult birth?
dystocia
The hormone responsible for the stimulation of milk “letdown” is
oxytocin
The site pf semen deposition during artificial insemination of cattle is
the uterine body
Some advantages of estrous synchronization are
closer calf seasons, less labor cost, and scheduled breeding times
In the mating of two heterozygous (Bb) cattle what percentage of the offspring will be red?
25%
The hormone that is produced by the corpus luteum on the ovary is called _____ (the pregnancy hormone)
progesterone
The first milk that is produced after parturition that is high in antibodies is called
colostrum
For cattle artificial insemination, straws of semen are stored/ preserved in
liquid nitrogen
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
prostaglandin
The seminiferous tubules located within the testes are responsible for the production of what?
sperm cells
If an animal has one dominant allele and one recessive allele for a given trait; they are considered
heterozygous (Bb)
Who was the founder of modern genetics?
Gregor Mendel
Who was given the name “Father of the Art of Animal Breeding” ?
Robert Bakewell
What type of inheritance involves measurable trait that are strongly influenced by the environment?
Quantitative Inheritance
What breeding system mates closely related individuals?
Inbreeding
_____ is the term for an increase in productivity in the crossbred progeny above the average of breeds or lines that are crossed.
Heterosis
Why are mules a sterile species cross?
Unpaired chromosomes and not enough homology
