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2004 2006 G. R. Wiggans*, L. L. M. Thornton*,1, R. R. Neitzel †, and N. Gengler ‡ * Animal Improvement Programs Laboratory, ARS, USDA, Beltsville, MD †

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Presentation on theme: "2004 2006 G. R. Wiggans*, L. L. M. Thornton*,1, R. R. Neitzel †, and N. Gengler ‡ * Animal Improvement Programs Laboratory, ARS, USDA, Beltsville, MD †"— Presentation transcript:

1 2004 2006 G. R. Wiggans*, L. L. M. Thornton*,1, R. R. Neitzel †, and N. Gengler ‡ * Animal Improvement Programs Laboratory, ARS, USDA, Beltsville, MD † Brown Swiss Association, Beloit, WI ‡ National Fund for Scientific Research, Brussels, Belgium and Gembloux Agricultural University, Belgium 1 Presenter: laura@aipl.arsusda.gov Abstract #341 Rear Legs (Rear View) for Brown Swiss and Guernsey Breeds

2 ADSA/ASAS Joint Meeting 2006 (2)Wiggans et al. 20042006 Why Rear Legs (Rear View)?  Mobility is major producer concern  Lameness is third most likely cause for culling  Not considering production  Selection could improve mobility and productive life

3 ADSA/ASAS Joint Meeting 2006 (3)Wiggans et al. 20042006 International participation  Holstein RLRV is reported from all participants but CZE and NZL  Ayrshire RLRV is reported from AUS, CAN, DEU, DFS, and NOR  Jersey RLRV is reported from AUS, CAN, DNK, ITA, NLD, ZAF  Guernsey RLRV is only reported from AUS, CAN  Brown Swiss RLRV is not included as an INTERBULL trait

4 ADSA/ASAS Joint Meeting 2006 (4)Wiggans et al. 20042006 Scoring  Brown Swiss scored on scale of 1 (low) to 9 (high)  Guernsey scored 1 to 50  Higher scores generally preferred, but extremes are not desired

5 ADSA/ASAS Joint Meeting 2006 (5)Wiggans et al. 20042006 Score Frequency 1 Brown Swiss scores multiplied by five 2 Guernsey scores grouped by fives 0 500 1000 1500 2000 2500 3000 05101520253035404550 Score for Rear Legs (Rear View) 1,2 Animals Guernsey Brown Swiss

6 ADSA/ASAS Joint Meeting 2006 (6)Wiggans et al. 20042006 Scoring cont. Trait Description Appearance of rear legsScore Perpendicular to ground, may hock out, toe in High Straight track, no hock in or out, no toe in or out Optimum Hock in, slight toe outModerate Severely hock in, toe outLow

7 ADSA/ASAS Joint Meeting 2006 (7)Wiggans et al. 20042006 Scoring cont. Hock in, toe out Correct conformation Picture credit: http://www.ansci.umn.edu/dairy/documents/judging_dairy_cattle.pdf

8 ADSA/ASAS Joint Meeting 2006 (8)Wiggans et al. 20042006 Data 99 Unknown parent groups 1 213228Sires with ≥5 daus 17,82723,353 Pedigrees including ancestors 229417Herds 4,7497,676Cows 5,4378,503Records GuernseyBrown Swiss 1 2 birth years/group

9 ADSA/ASAS Joint Meeting 2006 (9)Wiggans et al. 20042006 Rear Legs (Rear View) Parameters 5.8 0.102 Brown Swiss 7.48.8 Standard deviation 0.0780.11Heritability GuernseyHolstein

10 ADSA/ASAS Joint Meeting 2006 (10)Wiggans et al. 20042006 Genetic Correlation of Rear Legs (Rear View) with Linear Type Traits 0.340.44−0.03Dairy form 0.220.310.15Rear udder height −0.110.010.10Udder depth 0.430.710.20Rear udder width 0.17 −0.14 −0.42 0.23 0.32 Holstein 0.060.24Fore udder attachment −0.08−0.19Rump angle −0.46−0.11Rear legs (side view) 0.160.47Thurl width 0.300.49Strength GuernseyBrown SwissTrait

11 ADSA/ASAS Joint Meeting 2006 (11)Wiggans et al. 20042006 Calculation of Evaluations  First: Evaluate final score & 15 linear traits with current system  Second: Evaluate rear legs (rear view)  Use only records with rear legs (rear view) in 17-trait system Allows use of correlated trait information No heterogeneous variance adjustments Only rear legs (rear view) evaluations retained

12 ADSA/ASAS Joint Meeting 2006 (12)Wiggans et al. 20042006 Cow evaluations Brown SwissGuernsey Records5,7094,749 Reliability, %32.929.9 Mean, PTA0.010.08 Minimum, PTA−1.50−2.70 Maximum, PTA1.302.60 Standard deviation0.390.52

13 ADSA/ASAS Joint Meeting 2006 (13)Wiggans et al. 20042006 Bulls with ≥5 daughters Brown SwissGuernsey Bulls228213 Daughters20.919.0 Herds12.810.4 Reliability, %49.644.7 Mean, PTA0.020.07 Minimum, PTA−1.20−1.70 Maximum, PTA1.302.20 Standard deviation0.430.61

14 ADSA/ASAS Joint Meeting 2006 (14)Wiggans et al. 20042006 Further Research  Introduced in May 2006  Investigate trait inclusion in Feet & Legs Composite  Check impact on Net Merit  Second evaluation step may be unnecessary after more years of data accumulate


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