Temporal trends in reproductive performance in Irish dairy herds and associated risk factors

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Temporal trends in reproductive performance in Irish dairy herds and associated risk factors

  1. 1. Temporal trends in reproductive performance in Irish dairy herds and associated risk factors Summarised by Liis Maisla
  2. 2. Overview <ul><li>Introduction to the problem </li></ul><ul><li>Changes </li></ul><ul><li>Principal components of the trend </li></ul><ul><li>Conception </li></ul><ul><li>Factors </li></ul><ul><li>Action and consequences </li></ul><ul><li>References </li></ul>
  3. 3. Introduction to the problem <ul><li>Declining fertility in Irish dairy herds </li></ul><ul><li>Started in 1980s </li></ul><ul><li>Developed slightly, gradually </li></ul><ul><li>Caused by changes in farming systems </li></ul>
  4. 4. Changes <ul><li>Increase in submission rate </li></ul><ul><li>Calving-to-service interval has grown </li></ul><ul><li>approximately on day per week </li></ul>
  5. 5. The pricipal components of trend <ul><li>Reduced expression of estrus </li></ul><ul><li>Fall in conception rate </li></ul><ul><ul><li>Poor quality of oocyte or embryo </li></ul></ul><ul><ul><li>Low fertility of sires </li></ul></ul><ul><ul><li>Subestrus </li></ul></ul><ul><li>Postpartum endocrinopathies </li></ul>
  6. 6. Conception <ul><li>Less than 50% conceived to first service </li></ul><ul><li>Significant percentage not pregnant at the end of breeding season </li></ul><ul><ul><li>15-weeks </li></ul></ul><ul><ul><li>Aimed to co-ordinate peak milk yield with maximum grass growth </li></ul></ul><ul><li>Top quartile of herds – remarkably higher rate </li></ul>
  7. 7. Factors <ul><li>Genetical and environmental factors, their interactions </li></ul><ul><ul><li>Body contition </li></ul></ul><ul><ul><li>More frequent use of DIYAI </li></ul></ul><ul><ul><li>Trait selection for milk production </li></ul></ul><ul><ul><li>Grown herd size </li></ul></ul>
  8. 8. Action and consequences <ul><li>Feeding improvements </li></ul><ul><ul><li>to avoid negative energy balance </li></ul></ul><ul><li>Systems to encourage detection of estrus </li></ul><ul><ul><li>less labour </li></ul></ul><ul><li>Selecting for more fertile cattle </li></ul><ul><li>Without action : </li></ul><ul><li>R esponse to traditional veterinary therapy may diminish . </li></ul>
  9. 9. References <ul><li>John F. Mee „ Temporal trends in reproductive </li></ul><ul><li>performance in Irish dairy herds and associated risk factors “ </li></ul><ul><li>Irish Veterinary Journal, 2004 </li></ul><ul><li>doi:10.1186/2046-0481-57-3-158 </li></ul><ul><li>Available at: </li></ul><ul><li>http://www.irishvetjournal.org/content/57/3/158 </li></ul>
  10. 10. Thank you for attention!

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