Download Heat stress round table

Heat stress round table
Feb 2012
Fabio de Rensis & M.A. Driancourt
Backbone of our discussion
• How do you know that heat stress is starting? Is over?
• Which changes in your management do you implement to minimize
the consequences of heat stress on reproduction? Do you
implement a specific strategy during the carry over period?
• What is, from your point of view, the main limiting factor to improve
conception rate during the heat stress period?
2
How do you know that heat stress is starting? Is over?
How do you know that heat stress is starting? Is over?
• External temperature and humidity
• Rectal temperature or breathing rate of a selected group of animals
• Drop in food intake
•Drop in milk production
Which changes in your management do you implement
to minimize the consequences of heat stress on
reproduction? Do you implement a specific strategy
during the carry over period?
increased
cortisol,PRL
Thermal stress
Estradiol
•Poor
•Poor
Estrus
Estrus
expression
expression
•Poor
•Poor
quality
quality
oocytes-CL
oocytes-CL
Decreased
GnRH & LH
progesterone
Infertility
Negative
energy
balance
Reduced
feed intake
Embryo
losses
Compromised
uterine
environment
Thermal stress
De Rensis et al., Theriogenology 20
Which changes in your management do you implement to
minimize the consequences of heat stress on
reproduction? Do you implement a specific strategy
during the carry over period?
• Cooling strategies
•Estrus synchronization treatments
• GnRH administration at AI or hCG during the luteal phase
• Embryo transfer
What is, from your point of view, the main factor limiting
reproductive efficiency during the heat stress period?