Date post: | 24-Dec-2015 |
Category: |
Documents |
Upload: | arron-holt |
View: | 221 times |
Download: | 0 times |
• What is AI?
– Collecting semen from a male and artificially placing it directly into the uterus horn of a female
Artificial Insemination (AI)
Teaser
Electro ejaculator Dummy
• Why use AI?
– To make widespread use of males with
high genetic merit
– Cost beneficial
• E.g. stud ram cost $6000/100 ewes = $60 per head mated
total AI cost $3000/100 ewes = $30 per head mated
– National access to superior males
• Disadvantages
– Time consuming, requires planning
– Technical expertise, errors can be costly
Artificial Insemination (AI)
Laparoscopic Technique
– Place semen directly into uterus horn through the abdominal cavity
• Cervical Technique
– Place semen in uterus horn directly through the cervix
AI Methods
The sire (male) will influence rate of genetic gain more strongly than the
dam (female)
•Sires (semen)
– High genetic merit
– Semen quality and quantity
•Dams
– Genetic merit, mothering traits
– Body condition
Selecting Sires and Dams
Starting AI Programme• Animals selected for AI should be in good health, body
condition score ideally 3 - 3.5
• Day 1: A CIDR containing progesterone is inserted intravaginally. This suppresses oestrus and ovulation in the ewe.
• Day 13: CIDR is removed. Ewe is injected with PMSG which stimulates ovarian follicle development (oestrus)
• 48-52 hours later: AI surgery
CIDR: controlled internal drug release
PMSG: pregnant mare serum gonadotrophin
• Animals are fasted for 12-24 hours
• Animal is prepared for surgery: sedated, put in cradle, wool clipped, site sterilized, local anesthetic
• Semen straw is brought to body temperature
• Abdomen is punctured with trocar, CO2 is pumped
into the cavity to make the area more accessible.
• A laparoscope (light source) is inserted down the trocar cannula
• On opposite side forceps are inserted to hold the uterus horn
• Semen straw is inserted through the abdomen, and semen is injected into the uterus horn
• Topical antibiotic powder applied.
AI Technique