holstein service-sire fertility for heifer and cow breedings with conventional and sexed semen
DESCRIPTION
Holstein service-sire fertility for heifer and cow breedings with conventional and sexed semen. Sire Conception Rate. Implemented in August 2008 Based on: Last 4 years of breedings Up to 7 conventional semen breedings Parities 1 through 5 10 effects to predict bull conception rate - PowerPoint PPT PresentationTRANSCRIPT
H. D. Norman, J. L. Hutchison, and P. M. VanRaden
Animal Improvement Programs Laboratory ARS, USDA, Beltsville, MD
CDCB/AIPL Meeting (1) 2010J. L. Hutchison
Holstein service-sire fertility for heifer and cow breedings with conventional and sexed
semen
J. L. Hutchison 2010CDCB/AIPL Meeting (2)
Sire Conception Rate
Implemented in August 2008
Based on:
Last 4 years of breedings
Up to 7 conventional semen breedings
Parities 1 through 5
10 effects to predict bull conception rate
Sexed-semen breedings and heifer data not included
J. L. Hutchison 2010CDCB/AIPL Meeting (3)
Data
Derived 3 alternative models from SCR:
Sexed semen for cows
Conventional semen for heifers
Sexed semen for heifers
Service sire age groups condensed for sexed semen breedings due to limited number of bulls
Parity removed from models with heifer data
J. L. Hutchison 2010CDCB/AIPL Meeting (4)
Data
Based on January 2010 evaluation
Breedings from 2006 through 2009
Publishable Holstein bulls were included
Bulls with ≥300 breedings in ≥10 herds overall and ≥100 matings during the last 12 months
J. L. Hutchison 2010CDCB/AIPL Meeting (5)
Number of bulls
ModelJanuary 2010
Conventional, cow 2,309
Sexed, cow 25
Conventional, heifer 270
Sexed, heifer 114
J. L. Hutchison 2010CDCB/AIPL Meeting (6)
Mean number of matings/bull
ModelJanuary 2010
Conventional, cow 3,297
Sexed, cow 1,263
Conventional, heifer 3,321
Sexed, heifer 1,313
J. L. Hutchison 2010CDCB/AIPL Meeting (7)
Statistical summary
Model Mean SCR SD RELConventional, cow 0.000 2.21 79
Sexed, cow -0.012 2.39 73
Conventional, heifer
0.002 2.57 82
Sexed, heifer 0.002 4.34 75
J. L. Hutchison 2010CDCB/AIPL Meeting (8)
Correlations between SCR
Conventional, cow
Sexed, cow
Conventional, heifer
Sexed, heifer
Conventional, cow
— 0.18 0.67 0.10
Sexed, cow 0.24 — 0.16 0.75
Conventional, heifer
0.82 0.20 — 0.08
Sexed, heifer 0.13 1.02 0.11 —
Genetic correlation (rg) for true SCR below diagonal
J. L. Hutchison 2010CDCB/AIPL Meeting (9)
Correlations between SCR
Conventional, cow
Sexed, cow
Conventional, heifer
Sexed, heifer
Conventional, cow
— 0.18 0.67 0.10
Sexed, cow 0.24 — 0.16 0.75
Conventional, heifer
0.82 0.20 — 0.08
Sexed, heifer 0.13 1.02 0.11 —
Genetic correlation (rg) for true SCR below diagonal
J. L. Hutchison 2010CDCB/AIPL Meeting (10)
Correlations between SCR
Conventional, cow
Sexed, cow
Conventional, heifer
Sexed, heifer
Conventional, cow
— 0.18 0.67 0.10
Sexed, cow 0.24 — 0.16 0.75
Conventional, heifer
0.82 0.20 — 0.08
Sexed, heifer 0.13 1.02 0.11 —
Genetic correlation (rg) for true SCR below diagonal
J. L. Hutchison 2010CDCB/AIPL Meeting (11)
Correlations between SCR
Conventional, cow
Sexed, cow
Conventional, heifer
Sexed, heifer
Conventional, cow
— 0.18 0.67 0.10
Sexed, cow 0.24 — 0.16 0.75
Conventional, heifer
0.82 0.20 — 0.08
Sexed, heifer 0.13 1.02 0.11 —
Genetic correlation (rg) for true SCR below diagonal
J. L. Hutchison 2010CDCB/AIPL Meeting (12)
Correlations between SCR
Conventional, cow
Sexed, cow
Conventional, heifer
Sexed, heifer
Conventional, cow
— 0.18 0.67 0.10
Sexed, cow 0.24 — 0.16 0.75
Conventional, heifer
0.82 0.20 — 0.08
Sexed, heifer 0.13 1.02 0.11 —
Genetic correlation (rg) for true SCR below diagonal
J. L. Hutchison 2010CDCB/AIPL Meeting (13)
Conclusions
Fertility rankings for sexed semen differ considerably from conventional evaluations and warrants separate SCR
Combining cow and heifer breedings together in some manner would seem to be advantageous