current reproductive examinations in dairy cow
TRANSCRIPT
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Current Reproductive Examinations in Dairy Cow
Dr. Darab Nikjou (DVM, DVSc)
Large animal practitioner
E-mail: [email protected]
Tel: 0914 421 1714
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Parturition Including transition period problems
(3 week before through 3 week after parturition)
Clean test (1st) (Recheck problem cows)
Clean test (2nd) (Recheck problem cows)
May be another check for resumption of ovarian activity and preparing for AI
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Pregnancy diagnosis (At about Day 30)
Pregnancy recheck (At about Day 60/120)
Pregnancy recheck before drying off (210-215 days of gestation)
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Non-pregnant cows and cows ready to
service Repeat breeder and
“problem cows”
Cows with abnormal delivery time (delayed or premature parturition)
Abortion, Mummification, … (Fetus/Embryo losses)
Pregnant cows that are “in heat”
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Monitor parturition process
If after 12 hours of restlessness there is no straining veterinary examination should be made to exclude primary uterine inertia, failure of the cervix dilation and uterine torsion. After 60 min. of straining in cows (and 70 min. in heifers) the birth canal should be checked for obstructive birth. In case of sudden cease in straining (second stage of labour) check the cow!
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Dystocia Injuries of reproductive tract (birth canal)
Retained fetal membranes (retained placenta) Metritis (may be acute/septic)
Transition Period events have direct and indirect effects on fertility …
Periparturient paresis (milk fever) Hepatic lipidosis (fatty liver syndrome) Ketosis Displaced abomasum
Nutrition and BCS
management
Reduced immune system
function
Calving area: unsanitary and
stressful
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Clean Test (1st)
1- Cows reaction to rectal palpation 2- Involution lines and firmness of the uterus 3- Consistency of discharge (normal lochia) 4- Body condition scoring (>3.75 at risk o metabolic disorders) 5- Injuries are important (minor or major) 6- Edema (udder, perineum and in some cases vulva) 7- Check the body temperature 8- Ask about general health and appetite In case of retained fetal membranes
Lose or firm? How is the discharge odor? How is body temperature?
Do it within 10 days of calving (Preferred time between D5 and D12)
No need to ultrasonography
In most cases the ovaries are out of reach
… recheck the problem cows after intervention
Metritis is an urgent situation
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Clean Test (2st) 1- Check the normal size of the uterus (uterine involution) considering parity. 2- Use ultrasonography to search the uterus for free hyperechoic fluids (pus), exudate and debris. 3- Are there any adhesions and abscesses in pelvic cavity (ovaries, uterus, oviducts, ovarian bursa and ligaments)? 4- Ovarian activity should be checked. Intervention needs in cases of ovarian cysts or inactive ovaries. 5- If everything is ok, let the cow enjoy her voluntary waiting period (VWP)! 6- Recheck the problem cows after intervention.
Do it at the fifth week of calving (Preferred time between D28 and D35
and ultrasonography is valuable)
If you have scheduled Timed Breeding Programs for first service, then the next examination is pregnancy diagnosis.
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Endometritis
This cow is in heat but look at the flocculation in the lumen of the uterus.
Normal follicle
Echogenic fluid inside the uterine lumen
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Abnormal uterine fluid is easily differentiated from the normal fluid of pregnancy.
Abnormal Uterine Fluid
Cross sections of uterine horn, with purulent material
Purulent material can appear as any shade of light gray to nearly white depending on its density.
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Currently there are three reliable methods of diagnosing the pregnancy status of a cow: 1- Transrectal palpation 2- Transrectal ultrasound examination 3- Endocrine testing (PAGs, P4,…)
Pregnancy diagnosis
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Pregnancy diagnosis 5th week (Days 28-35)
Rectal palpation:
1- The amniotic vesicle 2- Mild enlargement and asymmetry of the uterine horn - especially in heifers 3- Presence of CL on ipsilateral enlarged horn 4- Chorioallantoic (membrane) slip – gently after Day 30
Transrectal ultrasound examination: 1- Embryo floating in amniotic fluid 2- Identify pathologic conditions of reproductive tract - recheck 3- Precise detection of Day
Embryo
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D27 D35
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CL
D29 D29
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Twin Pregnancy
D33
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Pregnancy diagnosis 9th week (Days 56-63)
Rectal palpation:
1- The amniotic sac loses its turgidity, allowing palpation of the fetus 2- Marked enlargement of the gravid uterine horn – not in case of twins 3- Presence of CL on ipsilateral enlarged horn 4- Chorioallantoic (membrane) slip – in both horns 5- Placenta
Transrectal ultrasound examination: 1- Embryo floating in amniotic fluid 2- Identify pathologic conditions of reproductive tract - recheck 3- Precise detection of Day 4- Placenta (cotyledon-caruncle complex)
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D65 D60
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Twin Pregnancy One dead
Both dead
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Pregnancy recheck before drying off (210-215 days of gestation)
1- Palpation of placenta and fetal sac; cotyledon-caruncle complex
2- Palpation of the enlarged middle uterine artery (fremitus); >4 M
3- Fetus (If accessible); check the reactions
4- Inability to retract the cervix
5- Use Ultrasonography if necessary
8 months 6 months 7 months
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Abortion (Fetus/Embryo losses)
1- Check pregnant cows that are “in heat” but no observed abortion
2- Abortion report by farm staff; embryo and/or fetal membranes
3- Abnormal discharges of reproductive tract
4- Search for the another fetus – twin possibility
5- Recheck the aborted cow two week later (more or less) for the next
reproductive plan
6- Evaluate the cow as she will stay or culled
7- Mummification and maceration can be the result of incomplete abortion
In last trimester there is a risk of metritis and birth canal injuries
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Cows with abnormal delivery time
1- Delayed parturition Confirm the pregnancy Be confident of AI date Check the fetus live/dead Induce parturition if indicated
2- Premature parturition
Inspect for managerial factors if it is a problem in the herd (nutrition, housing, heat stress, …)
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1- Cows ready to service (after VWP) 2- Cows that are negative in pregnancy test 3- “Problem cows” that already had an intervention and repose 4- Repeat Breeder cows
Non-pregnant cows
Economic importance
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For repeat breeder and problem cows:
1- Search uterine lumen for any hyper-echogenic fluid
2- Check ovaries for cysts, ovarian-bursal adhesions
3- Reproductive tract must be intact (no abscesses/adhesions)
4- Inflammation of oviducts and/or any fluid inside the oviduct lumen
5- Check the vaginal discharge, is there any tenesmus at the time of
rectal palpation (Vaginitis)
6- Vulvar sinking/deformity, urovagina, pneomovagina, …
7- Any other concurrent harmful situation or diseases (management,
nutrition, heat stress …)
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FSH
LH
E2
P4
No. follicles≥4mm
DF RF
DF RF
DF
DF
Ovarian dynamics cattle
Hormonal interplay controlling
follicular wave dynamics during
a two-wave interovulatory interval
Inhibin
8-41
D 9-10
D 9-10
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Two – wave 20 days
Three – wave 23 days
8-9
9-10
15-16
16
19
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OV
OV
Emergence D 0
Emergence D 9-10
Selection and Divergence D 2.5, Size 8.5 mm
6 – 9 (Critical days for start of FTAI)
5 – 15 (Responsive CL)
Domination
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Use Fixed Time AI for the first service
7d 3d 7d 7d 56h 16h
GnRH GnRH GnRH PG PG GnRH
FTAI
Double ov-synch
PG 3 G
G6G
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Use PGf2α and AI if estrus detection rate is good
PG
2d 4d
0 2 6 14 16 20
PG
Heat detection and AI
Heat detection and AI
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Use brief programs to save the time
ov-synch
Heat-synch
PG+E2
7d 56h 16h
GnRH PG GnRH
FTAI
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8-9
9-10
15-16
16
19
7d 56h 16h
GnRH PG GnRH
FTAI
Presence of CL
Follicle >10mm
Minor number of follicle (no emergence)
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Cervix of proestrus and oestrus Cow
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Uterus Of Diestrus Cow
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Uterus Of Oestrus Cow
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Oedema in the uterus of Oestrus Cow
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15 days after parturition
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Pyometra
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Mid cycle follicle
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Mid cycle follicle
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Twin Ovulatory Follicles
Twin Ovulation
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Thanks