W8 Fertility Flashcards
Fertile bull
Sub fertilw
Infertile
Impregnate 60% in 3 weeks, 90% in 9 weeks 50 healthy cows
Can achieve pregnancy but not high rates
no preg
20-40% bulls are sub/infertile
Bull BSE components
General physical Repro exam Scrotal circumference Semen collection Semen assessment Repoty
Physical
Muscles. limbs, eyes, teeth, testicles, toes, movement
Repro exam
External
- Testicles, scrotum
- Epididymis, ductus deferens
- Scrotal nick
- Penis
Internal
- Pelvic urethra
- Accessory sex glands
Scotal circumference
- Heritable .4-.6
- Highly correlated with daily sperm production
- Correlated with age of puberty in heifer offspring
- Correlated with fertility of female offspring
- Correlated with age of puberty in bulls
18 months should be 32cm
Semen Collection
AV
EEJ
Massage
Chemical
Semen examination
Volume, colour, density Sperm motility (gross and % progressive) Sperm morphology Live/dead estimation Concentration
Compensable abnormalities
Can be compensated for by increaseing the insemination dose - don’t inhibit normal sperm
Uncompensable abmormalities
Cannot be compensated for by inceasing dose - DO inhibit normal sperm
Why do bull repro assessment
ID satisfactory and unsatisfactory to place bull into predictable groups
Insurance, pre purchase, susprected infertility
Female measures used
- non return rate
- Services per conception
- Pregnancy Rate
- Parturition rate
- Weigning rate
- non return rate
- % of females that do not return to oestrus after joining
- Indicative 28-5 days, accurate 69-90
-Services per conception
inseminations / #conception
-pigs
Preg rate
number females preg vs total joined
Parturition rate
lambed / # joined
Why do repro evaluation in females
Diagnose pregnancy
Diagniose problemts
Select replacements
Oestrus Detection methods
Ewes- need male or teaser
Sows- back pressure test, or male introduction
Cows- visual -kamars (heat detection pad), tail paint, chin-ball harness
Pregnancy diagnosis - why
ID cow early which arent preg = cull
ID multiples for extra feeding
Certify for selling
ID abnormalities
Methods of preg diagnosis
Rectal palpation
Ultrasound
Cardinal signs of preg cow
Amniotic vesicle
fetal membrane slip
placentomes
fetus
