Stallions Flashcards
When would you perform BSE:
1.
2.
3.
- Routine Pre-season
- Pre-sale
- Investigation of a problem
BSE Aspects:
1.
2.
3.
4.
- History and ID
- PE
- Collect to ejaculates an hour apart, proxy for daily sperm output. Calculate motility and morphology of second ejaculate.
- Any special tests
BSE: History and ID:
- ID to look for:
- History to examine:
- Tattoo, brand, color, markings, photos
2. General health and breeding history
General PE:
- 2.
3.
4.
- Body condition
- Musculoskeletal system
- Inherited defects
- Lab tests
Repro tract PE:
External genitalia: examine: 1. 2. 3. 4.
- Scrotum and testes
- TSW
- Testicular dimension
- Testicular volume
Semen Collections
Artificial Vagina options:
1.
2.
3.
etc
- Missouri
- Nishikawa
- CSU
When to use Ground collection for semen?
If they have muscuoloskeletal disorders or if it’s more conveninent
Chemical Ejaculation methods:
1.
2.
3.
4.
- Adrenergic response
- Norepinephrine
- Imipramine
- Xylazine
Aspects of Semen Evaluated:
1. 2. 3. 4. 5. 6.
- Volume (via gel or filtration)
- Color and consistency
- Sperm concentration
- pH
- Sperm motility
- Sperm morphology
Stallion semen characteristics:
- Volume?
- Sperm concentration?
- Total sperm?
- 50 mL
- 120x10^6/mL
- 5-15x10^9
Stallion semen characteristics:
- Motility?
- Morphology?
- > 60%
2. >60%
Additional tests you can perform on semen:
1.
2.
3.
4.
- Seminal plasma alkaline phosphatase
- Electron microscopy
- DNA stability = sperm chromatin structure assay
- Hormone assay
Daily sperm output is affected by:
1.
2.
3.
4.
- Season
- Testicular size
- Age
- Sexual behavior
Second ejaculate averages what percent of the first?
55%
Shuttle stallions:
- Best not to expose to _____-
- Fertility (is/is not) affected?
- High live foal rates with….
- artifical short of long days
- is not
- largest mare books
- Testicular Volume (TV) =
2. Daily sperm output (DSO) =
- .5233 x Width x Height x Length (cm)
- .024 x TV - 1
Age has what affect on sperm output
1.
2.
- increased testicular size
2. increased epididymal sperm reserves