2004 2005 Paul VanRaden 1, Mel Tooker 1, Mahinda Dematawewa 2, and Ron Pearson 2 1 Animal Improvement Programs Laboratory, USDA 2 Virginia Polytechnic.

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Presentation transcript:

Paul VanRaden 1, Mel Tooker 1, Mahinda Dematawewa 2, and Ron Pearson 2 1 Animal Improvement Programs Laboratory, USDA 2 Virginia Polytechnic Institute Productive Life Including All Lactations, Longer Lactations, and Calf Value

ADSA-ASAS-CSAS JOINT MEETING 2005 (2)V AN RADEN Goals  Allow credit for longer lactations in productive life (PL) Tsuruta et al, 2005, JDS 88:1156  Update factors that predict PL for cows still alive (censored cows)  Improve the PL trait definition by considering lactation curves

ADSA-ASAS-CSAS JOINT MEETING 2005 (3)V AN RADEN Data Sets  Variance estimation from AIPL data  1,098,329 Holsteins born 1994  97  5109 sires with relationship matrix  10 mo, 12 mo, or unlimited length  2-mo calf value also considered  Data censored at 36 to 84 mo of age  Herds with complete lactations from DRMS history file

ADSA-ASAS-CSAS JOINT MEETING 2005 (4)V AN RADEN PL Heritabilities and Correlations Lactation limit (mo) h2h2 1012None+Calf 10 mo mo No limit Calf.068

ADSA-ASAS-CSAS JOINT MEETING 2005 (5)V AN RADEN Correlation of PL with Protein Correlation with protein10 mo12 mo No limit No limit + calf credit Phenotypic Genetic Phenotypic= , Genetic=.46JDS 76:2758

ADSA-ASAS-CSAS JOINT MEETING 2005 (6)V AN RADEN Early Measures of PL 10-mo limit PL statistic Censoring age 3 yr4 yr6 yrFinal Heritability Genetic correlation Phenotypic correlation w/1st-parity protein Genetic correlation w/1st-parity protein

ADSA-ASAS-CSAS JOINT MEETING 2005 (7)V AN RADEN Distribution of Months Until Culling 1 st -parity cows

ADSA-ASAS-CSAS JOINT MEETING 2005 (8)V AN RADEN Lactation Curve yield = e [.059(1  e .047*t )/.047 .0018*t]

ADSA-ASAS-CSAS JOINT MEETING 2005 (9)V AN RADEN First- and Later-Parity Shapes

ADSA-ASAS-CSAS JOINT MEETING 2005 (10)V AN RADEN Current PL Credits Years Credit (%) 321

ADSA-ASAS-CSAS JOINT MEETING 2005 (11)V AN RADEN Possible PL Credits Years Credit (%) 321

ADSA-ASAS-CSAS JOINT MEETING 2005 (12)V AN RADEN Proposed PL Credits Month of lactation Parity

ADSA-ASAS-CSAS JOINT MEETING 2005 (13)V AN RADEN Conclusions  PL parameters are changing across time  Phenotypic correlations are fairly stable  Genetic correlations have declined rapidly  PL at 36-mo censoring has less info  Heritability is lower than 1993 estimate  Genetic correlation with final PL =.87 (vs.92)  Can increase lactation length limit in PL to 12 mo or use lactation curve credits