Lab Practical 1 Flashcards
What is the main structural difference observed in the cow and mare ovaries
The main structural difference between theses ovaries is the relative location of the cortex vs. the medulla. In cow cortex is on outside and in mare cortex in
How are boars housed at the swine education unit and why are they managed this way
Boars are housed individually or in group pens depending on their age and whether they display aggressive behavior towards the other boars
A piece of gauze was placed on top of the collection cup prior to semen collection. What is the purpose of the gauze
Its function is to collect the gel fraction of the ejaculate. To collect a viable ejaculate, the gauze prevents the gel fraction from entering the semen collection cup.
At what age will the NCSU swine educational unit start to use a boar’s semen for breeding
when the boar is eight months of age
Which types of gloves are used in semen collection in boars and why?
vinyl because they reduce the chance of killing sperm cells
What prevents boars from being collected using an artificial vagine
To ejaculate, boars require pressure in addition to the proper temperature. The amount of pressure on the boars glans penis can not be achieved with an artificial vagina, thus we collect via a gloved hand.
Brand name of the hormone used to induce puberty in pre-pubertal gilts
PG-600 or Matrix
Brand name of hormone used to super ovulate embryo transfer donors in cattle
FSH-P, Super-OV, FollitropinV, Gestyl
What brandname hormone controls out of season or early season breeding in mares
regulate
What hormones induce luteolysis regression in cattle
Lutylase, Prostamate
What brand name hormone increases intensity of uterine contractions during labor
Oxytocin, Pinocin
What brand name hormone treats ovarian cystic follicles in cattle
follutein and pregnyl
What brand name hormone blocks ovarian function in cattle
CIDR, MGA and Progesterone
What brand name hormone increases milk yield
Posiliac
What are the advantages and disadvantages of using the Elisa kit to test pregnancy
Advantage: Determine cyclic animals, Identify short cycles, Better management of
animals estrous cycle
Disadvantage: Cost,Time, inconsistent testing, May claim an animal is pregnant
when she is not (false positives)
What are the two exogenous hormones used in the NC Synch Protocol
-GNRH-Factrel
-Prostaglandin F2a - Lutalyse
What is the length of the goat estrous cycle and when do these animals generally display estrus
- Estrous Cycle Length – 21 days
- Seasonal Breeders – display estrus in Fall
What are sign/symptoms that a doe is in estrus
- Interest in buck
- Raised tail
- Vocalizations
- Red/swollen vulva
- Sometimes mucus from the vagina is present
What is the site of semon deposition by AI and natural service in the doe
- AI – Uterine Body
- Natural Service - Vagina
What are some advantages of using artificial insemination
o Introduce new genetics
o Introduce new breeds
o Small herd and don’t want to mess with a buck
What are some disadvantages of using artificial insemination in small ruminants
-requires more labor
-more invasive
-requires more equipment`
What is the flushing effect
Increase the amount of feed prior to breeding, mostly increasing energy, about 1 month before introducing bucks. Hope to increase body weight, ovulation rate, and therefore litter size.
Must continue through breeding season and for 30-40 more days
Doesn’t work in does that are too fat (BCS 4-5) or too thin (BCS 2 or less)
What is the buck effect and how does it work
- Utiziling the buck effect to induce estrus
o Strategic exposure of does to intact males will result in the doe displaying estrus approximately 7 to 10 days after the introduction of the buck
o Bucks need to be isolated from does for this procedure to be effective
o Buck must be out of the doe’s line of sight and sense of smell for an extended period of time, perhaps as long as several months
What are some of the safety tool we use when handling stallions at the EEU
leather halter, chain, whip, helmet and vest
