2006 Paul VanRaden Animal Improvement Programs Laboratory, USDA Agricultural Research Service, Beltsville, MD, USA Fertility Trait Economics and Correlations with Other Traits
Interbull Workshop 2006 (2) P.M. VanRaden 2006 Emphasis on Fertility, Longevity (% of total merit) CtryFertLongCtryFertLong USA711DNK89 DEU125AUS98 NLD108NZL108 FRA13 GBR17 CAN57SWE610 ITA8IRL2218
Interbull Workshop 2006 (3) P.M. VanRaden 2006 Fertility Trait Indexes % relative emphasis TraitNLDITAESPCANDNK 1 DO 2 NR 3 Days 1 st Insem Non− Return Heifer fertility Time from first to last insemination replaces non−return rate 2 Countries that evaluate only days open or calving interval 3 Countries that evaluate only non−return rate or number of inseminations
Interbull Workshop 2006 (4) P.M. VanRaden 2006 Predict Longevity from Fertility Which cow fertility trait contributes most to longevity? Days to first insemination (DFI) Non−return rate (NR) Combined longevity includes 23% DFI and 12% NR in CAN Only DFI in NLD Correlations =.33 DFI,.11 NR in USA
Interbull Workshop 2006 (5) P.M. VanRaden 2006 Foreign Bull Fertility PTAs Predict fertility from other traits Methods similar to multi−trait longevity Foreign correlations assumed = domestic MACE longevity, yield get highest weight Implemented in USA February 2006 Results for top 100 Net Merit bulls PTA mean was −.3, now −.7 – (as compared to SD of 1.4) REL mean was 28%, now 40%
Interbull Workshop 2006 (6) P.M. VanRaden 2006 Longevity Corr with US DPR, PL (>10 herds in both countries, Interbull longevity correlations) CtryDPRPLCtryDPRPL IRL.66.71ITA SWE.64.81DNK GBR.58.83NLD CAN.54.89CHE BEL.52.82AUS NZL.51.66FIN DEU.46.85FRA ESP.46.72ISR.22.39
Interbull Workshop 2006 (7) P.M. VanRaden 2006 Productive Life Credits Years Credit (%) 321
Interbull Workshop 2006 (8) P.M. VanRaden Productive Life Credits Years Credit (%) 321
Interbull Workshop 2006 (9) P.M. VanRaden 2006 Correlation of PL, Other Traits PTA of USA bulls born since 1995 ProSCSDPRUdd Feet / LegSizeDCE Old PL.07− −.20−.26 New PL.10− −.21−.27
Interbull Workshop 2006 (10) P.M. VanRaden 2006 Holstein Pregnancy Rate − Phenotypic and Genetic Trend 1965−2000
Interbull Workshop 2006 (11) P.M. VanRaden 2006 Heifer Fertility is OK Paul VanRaden, 1995
Interbull Workshop 2006 (12) P.M. VanRaden 2006 Value of Cow Fertility Fertility expenses per day open Heat detection ($20 / lact .005)= $.10 Semen ($15 / unit + $5 labor) *.025= $.50 Pregnancy exam ($10 / exam)*.012= $.12 Lactations too long or short= $.75 Value of DPR as % of total economic value 7% in Net Merit since August % in TPI since February 2005, also −2% for dairy form in TPI since February 2005
Interbull Workshop 2006 (13) P.M. VanRaden 2006 Conclusions Fertility and longevity receive a total of 8% to 40% of selection Corr(fertility, longevity) not uniform Days to 1 st insemination more important than conception rate? Selection for fertility reduces costs and increases longevity
Interbull Workshop 2006 (14) P.M. VanRaden 2006 Calving Interval (Trait 4 correlations) CtryBirthMilkFatProtLongSCS CAN−.06−.11−.13.21−.06 DNK−.40−.31−.28−.32.34−.18 ESP−.08−.38−.29−.35.38−.16 GBR−.27−.36 −.42.30−.13 IRL−.20−.40−.35− NLD−.41−.52−.43−.50.06−.13 NZL−.11−.32−.05−.21.59−.10 USA−.04−.21 −.17.48−.12
Interbull Workshop 2006 (15) P.M. VanRaden 2006 Conception Rate (Trait 3 correlations) CtryBirthMilkFatProtLongSCS CAN−.06−.07−.09.09−.04 DEU.06−.01−.03−.02.17−.04 DNK−.41−.43−.37−.47.23−.17 FRA.09.00− −.08 ISR−.06−.07−.16−.27.38−.15 NLD−.41−.39−.37−.48.08−.04
Interbull Workshop 2006 (16) P.M. VanRaden 2006 Calving to First Insemination (Trait 2 correlations) CtryBirthMilkFatProtLongSCS CAN−.01−.26−.16−.21.32−.12 DNK−.34−.42−.36−.40.25−.22 NLD−.33−.49−.46−.50.04−.15 NZL−.08−.29−.05−.19.49−.10
Interbull Workshop 2006 (17) P.M. VanRaden 2006 Heifer Fertility (Trait 1 correlations) CtryBirthMilkFatProtLongSCS CAN−.09−.11−.09−.14.14−.10 DNK−.27−.23−.19−.27.03−.05 GBR−.43−.48−.22−.44.13−.12