Beef Cattle and the Use of CIDRS

1
Beef Cattle and the Use of CIDRS

• Emily Barabe
• Lindsay Imhoff
• Laurie Rieden
• Stephanie Rosenheck

2
Client Scenario

• Our client is a rancher who has signed a contract
  to deliver 6 truckloads of calves to a feedlot at
  weaning.
• He will be paid a premium if he can deliver
  animals of approximately the same weaning weight
  and genetics.

3
Client Scenario

• This rancher has 410 cows. The herd is made up of
  both cycling and anestrus suckling cows.
• He wants to use the Eazi-Breed cattle insert
  along with prostaglandin
• He does not have enough bulls to breed all of the
  cows in a short time period, so he must use A.I.

4
Treatment Regime

• Day 0 Insert CIDR
• Day 6-7 Give lutalyse
• Day 7 Remove CIDR
• Day 8-11 Breed animal on observed estrus or
  timed A.I. (48-54 hours after removal of CIDR)

5
Drugs Involved

• CIDR Progesterone
• Targets uterine endometrium, hypothalamus
• Involved in steroid hormone action, therefore
  progesterone diffuses across the cell membrane
  and gets into the nucleus and causes a change in
  DNA synthesis.
• Involved in a negative feedback mechanism which
  inhibits GnRH surge (prevents ovulation by
  maintaining the corpus luteum)

6
Drugs Involved

• Lutalyse Prostaglandin 2 alpha
• - targets the corpus luteum
• - fatty acid that acts via a Ca2 2nd
  messenger system that will eventually increase
  the intracellular concentration of Calcium
• - will cause luteolysis therefore the current
  follicular wave will ovulate, estrogen from this
  follicular wave will also induce estrus

7
Effectiveness

• Can use on cycling and anestrous beef cows and
  cycling beef heifers
• Has lower success rate in anestrous cows
• Not for use in beef cows less than 20 days
  postpartum

8
Determining Success

• Palpate or ultrasound animals for CL before
  starting
• Pregnancy Check (ultrasound at day 28 or palpate
  after day 35)
• Watch for heats following CIDR removal

9
Labor

• Increased labor due to
• A.I. breeding
• Inserting CIDR
• Removing CIDR and injection
• Heat detection
• Additional help needed during calving period