Practical biotechnology: artificial insemination (AI) and embryo transfer (MOET) Flashcards
Is it possible to efficiently cryopreserve bull and boar semen? Is there a difference between the usage of the semen of the two specieses?
Yes, bull semen is almost allways used after cryopreservation, while boar semen is inseminated freshly.
What kind of methods can be used for the artificial insemination of the bitch?
Transvaginal insemination (fresh semen), intrauterin insemination with Norwegian catheter (cryopreserved semen), surgical insemination.
Which statement is true for the mare?
Estrus cycle is regular throughout the year with 21 days long cycles, but from November to February the mares are not bred.
The heat is 3 days long; insemination is to be performed on the 1st and 3rd days.
The symptoms of being in heat can be recognized easily in a stall containing mares only, as in this case the stallion is not disturbing the mares.
Restlessness, teasing each other, lifting the tail to one side, frequent urination, opening and closing the vulva, slight mucous discharge are the symptoms of oestrus.
The symptoms of being in heat can be recognized easily in a stud containing mares only, as in this case the stallion is not disturbing the mares.
Restlessness, teasing each other, lifting the tail to one side, frequent urination, opening and closing the vulva, slight mucous discharge are the symptoms of oestrus.
What is the optimal time for performing artificial insemination in the bitch?
13-17 days after the onset of vaginal bleeding, 4-6 days after the LH peak
When does the ovulation occur in the sow?
Usually in the 36-44th hour of the 60 hours long oestrus.
Which statement is false regarding MOET?
The donor is a valuble, genetically superior animal.
Both the donor and the recipients are valuble, genetically superior animals.
The synchronization of the recipients is not allways necessary.
The goal of synchronizing the recipients is to prepare the uterus of the recipient to support implantation.
The goal of superovulating the donor is to provide higher than normal numbers of embryos in the same cycle.
Both the donor and the recipients are valuble, genetically superior animals.
What is the goal of MOET?
To achieve higher number of offspring from genetically superior cows.
What kind of method can be used for semen collection from the stallion?
The semen can be collected with an artificial vagina, in the presence of a mare in heat.
Which methods can be used for the artificial insemination of the sow?
Conventional insemination, intrauterine insemination, deep intrauterine insemination; each method is used with fresh semen only.
What is the optimal time for the artificial insemination of the cow?
12-18 hours after the onset of standing heat.
