Bovine Repro Flashcards
When do you see puberty in the bovine?
when heifer reaches 50-60% adult body weight
What influences when a heifer reaches puberty?
Inbreed later onset
Cross-breeds sooner onset
Bos Taurus earlier than Bos indicus
Heifers from bulls large scrotal circumference
What are the stages of the Bovine estrus cycle?
Estrus
Metestrus
Diestrus
Proestrus
How many days are there in the Metestrus cycle of the Bovine?
1-4 days
How many days are there in the Diestrus cycle of the Bovine?
5-18 days
Estrus
sexual receptivity of female
Follicular maturation
What are the signs of Estrus in the bovine?
Increased restlessness Decreased rumination Decreased Appetite Decreased milk Bellowing
Metestrus
Final follicular maturation
Ovulation
Formation of CL
Diestrus
Period of CL dominance through luteolysis
Proestrus
Progesterone levels decreasing
Estrogen levels increasing
At what age are heifers bred in the dairy herd?
14-15 months
Voluntary Waiting Period
The period we allow for the uterus to involute and read for pregnancy
How long is the VWP?
60 days
Dry off
60 days to allow the mammary glands to rest before calving to ensure peak lactation after calving
What are the advantages of synchronization?
Reduce the window of time when insemination is appropriate
Reduce the time spent in estrus detection
enhance estrus detection
Allow scheduling of breeding/inseminations
provide for synchrony essential to most embryo transfer programs
What re the general principles of estrus control and synch?
shorten the luteal phase
lengthen the luteal phase
Lutalyse or Estrumate
causes regression of the CL
Estrus displayed in 2-5 days
What is the feed through product that can be used to synchronize cattle?
MGA
How does the CIDR work?
extends the Diestrus phase
Why do you use GnRH with the CIDR?
induced a synchronous emergence of a new follicular wave
What should you examine when examining the fetus?
Presentation
Position
Posture
How do you assess that the fetus is alive?
position response to pedal, palpebral, eye ball, mouth, and anal pressure by movement reflex
What does meconium suggest about the calf?
stressed calf
What does fetid odor suggest about the calf?
dead calf
Mutation
process by which fetus is restored to deliverable fashion
Repulsion
Pushing the fetus out of maternal pelvis into the uterine cavity to enable correction of abnormality
Rotation
Turning the fetus on its longitudinal axis
Version
Turning the fetus on its transverse axis into a cranial or caudal presentation
Eye hooks
placed into the medial canthus to help turn the head into the right position
Krey Hook
used to grab the jaw bone
used for mostly grabbing parts of the calf when you perform a fetotomy
Fetotomy
cutting up parts of the calf
Cornell detorsion rod
detorse the calf and uterus
What lube do you use for dystocia?
OB tube
What happens if you put traction on both forelimbs of the calf simultaneously?
shoulder lock
What are the indications for a fetotomy?
Dead fetus Uncorrectable fetal malposition Delivery by traction not working Fetomaternal disproportion Certain fetal monsters/ ankylosis Incomplete cervical dilation
What type of fetal monsters requires a C-section?
Anasarca calf
What is the most common fetotomy?
Partial fetotomy
What is included in a fetotomy aftercare?
Lavage uterus Systemic antibiotics Anti-inflammatories IV or Oral calcium IV fluids Ecbolics: oxytocin or lutalyse
What are the indications for c-section?
Vaginal delivery unsafe for dam or fetus Most time involves live fetus Inadequate room to place fetotome Oversize large fetus If necessary to save the dam's life
What is heritable in Herefords and Shorthorns?
Vaginal prolapse
Grade 1 vaginal prolapse?
floor of vagina protrudes intermittently
Grade 2 vaginal prolapse?
Floor vagina protrudes permanently
Grade 3 vaginal prolapse?
Cervix and most vaginal floor protrude
Grade 4 vaginal prolapse?
2nd or 3rd degrees that has been exposed long enough to cause necrosis/fibrosis
What is the treatment for vaginal prolapse?
Clean with mild antiseptic
debride some necrotic tissue
sugar to reduce edema
manual reduction
What is the prevention for Vaginal prolapse?
Buhner technique
Halstead technique/Horizontal mattress
boot lace
jorvet prolapse kit
What would you use to treat a Grade 4 prolapse?
Bootlace
What predisposes to Uterine Prolapse?
Hypocalcemia
Uterine inertia
Straining
How do you treat Uterine prolapse?
Epidural Clean and debride Position the down animal in sternal and extend hindlimbs caudally Reduce Vulvar retention sutures Antibiotics Calcium therapy Amputation
What are the sequela of Uterine prolapse?
Uterine artery rupture Septicemia Hypothermia Strangulation of other abdominal viscera within prolapse Reperfusion injury
First degree perineal laceration
only mucosa of vulva or vestibule
How do you treat
First degree perineal laceration?
Spontaneously heal
Second degree perineal laceration
Entire wall of vulva/vestibule and portion of perineal body but not the anus or rectum
Third degree perineal laceration
Entire wall of vagina, perineal body, rectum and anus with common opening for vagina/rectum
How long does uterine involution take?
25-50 days
What are the treatment for Retained Fetal membranes?
Antibiotic infusion
Collagenase
Metritis
Severe inflammation involving all layers of the uterus
Endmetritis
Inflammation of the endometrium extending no deeper than the stratum spongiosum
Pyometra
Collection of purulent exudate of variable amount within the endometrial cavity
What is the cause of Pyometra?
persistent corpus luteum
What are the clinical signs of Metritis?
Fetid red-brown watery uterine discharge
How do you treat Metritis?
Systemic Antibiotics
Anti-inflammatories
Uterine lavage
What is the treatment for Pyometra?
Remove the CL
What is a true anestrus?
insufficient hormonal stimulus
How do you treat true anestrus?
Nutrition
Eliminate stresses
Detect and treat pathology