2001 ADSA annual meeting, July 2001 (1) Timeliness of progeny-testing through AI and percentage of bulls returned to service (abstract 1020) H.D. NORMAN,*

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Presentation transcript:

2001 ADSA annual meeting, July 2001 (1) Timeliness of progeny-testing through AI and percentage of bulls returned to service (abstract 1020) H.D. NORMAN,* R.L. POWELL, J.R. WRIGHT Animal Improvement Programs Laboratory Agricultural Research Service, USDA Beltsville, MD , USA C.G. SATTLER National Association of Animal Breeders Columbia, MO , USA

2001 ADSA annual meeting, July 2001 (2) Successful progeny testing (PT)  Select bulls with high pedigree merit  Early semen collection  Rapid semen distribution and use in milk-recorded herds  Daughters with unique ID, recorded pedigrees, and kept until milking

2001 ADSA annual meeting, July 2001 (3) PT accuracy and impact  Accuracy of PT evaluations  Number of daughters  Daughter distribution across herds  Impact on genetic improvement  Number of bulls sampled  Intensity of culling of PT bulls

2001 ADSA annual meeting, July 2001 (4) Objectives  Summarize characteristics of PT programs related to timeliness of genetic evaluation  Examine distribution of PT daughters  Determine selection intensity after evaluation of PT bulls

2001 ADSA annual meeting, July 2001 (5) Data sources  National database at AIPL, ARS, USDA  Yield information from DHI  ID information from DHI and breed associations  Bull entry into PT programs and semen distribution dates from NAAB

2001 ADSA annual meeting, July 2001 (6) PT definition  AI organization in US  (exception: Semex USA)  Bulls aged mo at semen release  NAAB sampling controller codes  Daughters born 8-42 mo after bull entry into AI sampling  Usable 1st-lactation record  First 125 based on calving date

2001 ADSA annual meeting, July 2001 (7) Number of PT bulls (major studs) YearAyrBSGueHolJerMS

2001 ADSA annual meeting, July 2001 (8) Bull age (mo) at semen distribution Year*AyrBSGueHolJer *Year of bull entry into AI sampling

2001 ADSA annual meeting, July 2001 (9) Bull age SD (mo) at semen distribution Year*AyrBSGueHolJer *Year of bull entry into AI sampling

2001 ADSA annual meeting, July 2001 (10) Bull age (mo) at daughter birth Year*AyrBSGueHolJer *Year of bull entry into AI sampling

2001 ADSA annual meeting, July 2001 (11) Bull age SD (mo) at daughter birth Year*AyrBSGueHolJer *Year of bull entry into AI sampling

2001 ADSA annual meeting, July 2001 (12) Bull age (mo) at daughter calving Year*AyrBSGueHolJer *Year of bull entry into AI sampling

2001 ADSA annual meeting, July 2001 (13) Bull age SD (mo) at daughter calving Year*AyrBSGueHolJer *Year of bull entry into AI sampling

2001 ADSA annual meeting, July 2001 (14) PT daughter age (mo) at calving Year*AyrBSGueHolJer *Year of bull entry into AI sampling

2001 ADSA annual meeting, July 2001 (15) PT daughters (no.) Year*AyrBSGueHolJer *Year of bull entry into AI sampling

2001 ADSA annual meeting, July 2001 (16) Herd distribution (%) by herd PT use Herd PT use Year*0%1-19%20-49%50-99%100% < < *Year of first calving

2001 ADSA annual meeting, July 2001 (17) PT cows (%) by herd PT use Herd PT use Year*<10%10-19%20-49%50-99%100% *Year of first calving

2001 ADSA annual meeting, July 2001 (18) PT bulls (%) returned to AI service Year*AyrBSGueHolJer *Year of bull entry into AI sampling

2001 ADSA annual meeting, July 2001 (19) Conclusions  Slight increase in age of PT bull at semen release  Decrease in age of PT bulls at daughter birth  4.5 mo for Holsteins and Jerseys  Decrease in age of PT bulls at daughter calving  6 mo for Holsteins  5.5 mo for Jerseys

2001 ADSA annual meeting, July 2001 (20) Conclusions (cont.)  Decrease in herds with no PT records usable for genetic evaluation  85%  39%  Increase in herds with usable PT records  1-19% PT use: 11%  38%  >50% PT use: 1%  5%  1 in 7 PT bulls returned to active service not 1 in 10 PT  Active AI?