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Rear Legs (Rear View) for Brown Swiss and Guernsey Breeds

Rear Legs (Rear View) for Brown Swiss and Guernsey Breeds. 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. International participation.

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Rear Legs (Rear View) for Brown Swiss and Guernsey Breeds

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  1. Rear Legs (Rear View) for Brown Swiss and Guernsey Breeds

  2. 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. 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. 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. Score Frequency 3000 2500 Guernsey 2000 Brown Swiss Animals 1500 1000 500 0 0 5 10 15 20 25 30 35 40 45 50 1,2 Score for Rear Legs (Rear View) 1Brown Swiss scores multiplied by five 2Guernsey scores grouped by fives

  6. Scoring cont.Trait Description Score Appearance of rear legs Low Severely hock in, toe out Moderate Hock in, slight toe out Optimum Straight track, no hock in or out, no toe in or out High Perpendicular to ground, may hock out, toe in

  7. Scoring cont. Hock in, toe out Correct conformation Picture credit: http://www.ansci.umn.edu/dairy/documents/judging_dairy_cattle.pdf

  8. Data Brown Swiss Guernsey Records 8,503 5,437 Cows 7,676 4,749 Herds 417 229 Pedigrees including ancestors 23,353 17,827 Sires with ≥5 daus 228 213 Unknown parent groups1 9 9 12 birth years/group

  9. Rear Legs (Rear View) Parameters Holstein Brown Swiss Guernsey Heritability 0.11 0.102 0.078 Standard deviation 8.8 5.8 7.4

  10. Genetic Correlation of Rear Legs (Rear View) with Linear Type Traits Trait Holstein Brown Swiss Guernsey Strength 0.32 0.49 0.30 Thurl width 0.23 0.47 0.16 Rear legs (side view) −0.42 −0.11 −0.46 Rump angle −0.14 −0.19 −0.08 Fore udder attachment 0.17 0.24 0.06 Udder depth 0.10 0.01 −0.11 Rear udder height 0.15 0.31 0.22 Dairy form −0.03 0.44 0.34 Rear udder width 0.20 0.71 0.43

  11. 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. Cow evaluations

  13. Bulls with ≥5 daughters

  14. 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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