Dr. Michael Dyck - Impact of the Boar on Herd Fertility

693 views
537 views

Published on

Impact of the Boar on Herd Fertility - Dr. Michael Dyck, University of Alberta, from the 2012 Allen D. Leman Swine Conference, September 15-18, St. Paul, Minnesota, USA.

Published in: Business
0 Comments
0 Likes
Statistics
Notes
  • Be the first to comment

  • Be the first to like this

No Downloads
Views
Total views
693
On SlideShare
0
From Embeds
0
Number of Embeds
6
Actions
Shares
0
Downloads
20
Comments
0
Likes
0
Embeds 0
No embeds

No notes for slide

Dr. Michael Dyck - Impact of the Boar on Herd Fertility

  1. 1. Impact of the boar on herd fertility Michael Dyck George Foxcroft, Jenny Patterson and Amanda Minton Leman - Reproduction Workshop Sept 15, 2012
  2. 2. Not all boars are createdequal…… A single sperm is half a pig …………it probably requires < 1 thousand sperm at the site of fertilization to produce a litter….
  3. 3. Assessing Boar FertilityReproductive Performance – Despite “rigorous” semen evaluation, certain boars do not have the same reproductive performance – Routine semen evaluation standards (> 70% motility & < 30% abnormal sperm) detect male reproductive disorders….. …… but do not predict relative fertility among “acceptable”, healthy sires (Flowers et al. 1997; Alm et al. 2006; Ruiz-Sanchez et al. 2006)
  4. 4. Litter Size Data for 31 Boars (minimum of 50 matings/boar) Tony Chandrauk - Personal Communication
  5. 5. Not all boars are created equal!What is stopping us from achieving major gains in1. An inability to determine relative fertility of boars with high genetic merit when used with low numbers of sperm per AI dose.2. Use of pooled semen from boars with different, but largely unknown, “relative” fertility.3. Limited application of advanced AI technologies with semen from superior boars
  6. 6. Limitations of using Pooled SemenCertain boars have lower fertility if numbers of sperm per AI dose are reduced (say < 2 billion) Therefore, “diluting” sperm numbers of more fertile boars within a pool with sperm from boars that produce few offspring at lower sperm doses is an ineffective strategy when trying to maximize the impact of AI
  7. 7. Limitations of using pooled semen Use of pooled semen breaks the link between known genetic value of individual boars and the paternity of progeny produced.
  8. 8. Genetic Gains from AI?• Short-term Gains (Pork Storks, Australia) – Use fewer superior boars siring slaughter pigsNucleus • Long-term GainsMultiplier – Reduced “genetic-lag” inSow Herd nucleus-multiplier-Slaughter commercial pyramid (John R. Cosgrove, Banff Pork Seminar, 1996)
  9. 9. How improve a litter’s value? A high indexing terminal boar passes these traits on to his progeny. 1. Better feed conversion 2. Fewer days to market 3. Decreased mortality Increase $$ per pig produced(Williams, SBMW 2011)
  10. 10. On-going Studies:Large scale field studies:•Boar fertility evaluated with “low” semen doses ⁻ 2 billion sperm/AI dose ⁻ Minimum of 50 AI matings•All boars genotyped for Single Nucleotide Polymorphisms ⁻ Porcine SNP60 BeadChip (Illumina Inc., USA) to assess 62,163 SNPs per animal•Proteomic analysis of seminal plasma ⁻ Seminal plasma protein profiles for boars with “High” & “Low” fertility assessed by 2D electrophoresis
  11. 11. Steps for Improved AI programs1. Identify boars with acceptable fertility • Characterize boar fertility using Single-Sire matings 2. Eliminate boars with for limited reproductive capacity at lower sperm doses (2 billion) 3. Use boars with proven fertility at lower sperm doses (1 - 1.5 billion) for PC-AI 4. Retain boars with the highest EBVs for producing commercial progeny
  12. 12. Collaborative Trial• Holden Farms & University of Alberta• Objective: Decrease semen concentration per AI dose to improve the use of genetically superior boarsPhases of the trial:1. Prove boars at entry with single-sire matings (SSM) at 2B viable cells using multiple doses2. Move whole system to 2B viable cells3. Move to 1B viable cells using PCAI
  13. 13. Moving towards more efficient and 2 Billion improved AI ......Characterize boar .......Evaluating the true potential of fertility using single-sire AI. a boar • 50 Single sire matings per boar at a concentration of 2 Billion sperm • Production characteristics measured: - Pregnancy & farrowing rate - Litter size (total and alive) Single sireMultiple breedings, standard AI
  14. 14. D30 Pregnancy & Farrowing Rate 32%
  15. 15. Relationship between d30 PR and FR
  16. 16. Unproven boars Proven fertile boars 2 Billion 2 BillionCharacterize boar fertility using Removals due to 10-15% single-sire AI. low production & 33% overall value. Single sire Single sireMultiple breedings, Multiple breedings, standard AI standard AI
  17. 17. Unproven boars Proven fertile boars 2 Billion 2 Billion 1 BillionCharacterize boar Removals due to Removals fertility using low production & primarily due to single-sire AI. overall value. overall value. 33% 33% Single sire Single sire Single sireMultiple breedings, Multiple breedings, PCAI and/or Fixed standard AI standard AI Time Insemination
  18. 18. Factors contributing to the value of the boar EBV Farrowing Rate Pigs NPD Produced Litter Size NPD Others? (survivability)
  19. 19. Contribution Index (CI) Value of pigs produced (estimated per 100 sows)= Farrow rate * Born Alive * Index * Value (7¢/index point)
  20. 20. Ranking by Contribution Index (estimated per 100 sows)
  21. 21. Pregnancy Rate
  22. 22. Pregnancy Rate %
  23. 23. Removals due to fertility Pregnancy Rate
  24. 24. Index
  25. 25. PWB # boars Index CI (base = 0)All Boars (entered stud) 66 121.4 1312.0 -Structural/behavorial 8 123.1 1323.3 +0.1Substandard Sperm Production 7 120.0 1172.4 -1.5Low fertility (PR <90%) 8 119.5 1066.5 -2.4Boars Remaining 43 121.9 1394.8 +0.9Phase 2 – further decrease 33 125.3 1447.5 +1.1concentration PWB = pigs weaned / boar CI = Contribution Index
  26. 26. Economics for Holden Farms: (40,000 Sows)AI method Standard Standard PC-AI (Sows) Standard (Gilts)AI dose (billion) 3 ¯ 2 ¯ 1 2# Inseminations 2.4 = 2.4 ¯ 2.4 2.4# boars needed 231 ¯ 155 ¯ 61 31Average index 115 + 118 + 123 123# Sows/Gilts 40,000 = 40,000 = 32,000 8,000P/S/Y 25 + 25 = 25 25W-to-F losses 7% = 7% = 7% 7%Total pigs 1,000,000 = 1,000,000 - 800,000 200,000Sold/year 930,000 = 930,000 - 744,000 186,000Value per pig $0.07 = $0.07 = $0.07 $0.07 $416,640 $104,160 $7,486,500 $7,681,800 $8,007,300Annual Opps: $195,300 $520,800 (Diff 2 & 3B) (Diff PC-AI sows & 3B and gilts 2 & 3B) (Williams, 2011)
  27. 27. 2 Billion 1 BillionP/S/Y = 25.8 26.5 26.8 BOARS
  28. 28. Key Message Strategically use genetically superior boars Semen concentration Number boars needed Genetic index $0.80 to $1.31 per pig(Williams, 2011)
  29. 29. Future Directions: On-goingStudies Boar Fertility ParametersGenotypic SNP Seminal Plasma Profile Proteomic Profile Genomic & Proteomic Markers of Boar Fertility
  30. 30. THANK YOU!!

×