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Estimation an d d ecomposition of g enetic trends in a two way cross using Hungarian pig breeds Nagy, F arka s, Kövér, Czakó and Gorjanc ASD, 20 th Int.

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Presentation on theme: "Estimation an d d ecomposition of g enetic trends in a two way cross using Hungarian pig breeds Nagy, F arka s, Kövér, Czakó and Gorjanc ASD, 20 th Int."— Presentation transcript:

1 Estimation an d d ecomposition of g enetic trends in a two way cross using Hungarian pig breeds Nagy, F arka s, Kövér, Czakó and Gorjanc ASD, 20 th Int. Symposium 201 2, Kranjka Gora Slovenia

2 Introduction Genetic evaluation –Based on BLUP in most domesticated species –First application in pig: Hudson and Kennedy (1985) –In Hungary its application is compalsory from 2008 Purebred and crossbred data

3 Material Field test data of Pietrain (5717), Duroc (4868) and their cross (4728) Data from 199 8 to 20 10 from 68 herds Pedigree was available from 1983 (60926) Traits – Lean meat percentage (LMP) –Age (AGE) –Average daily gain (ADG)

4 M ethod Bivariate animal models Fixed effects –Year month –Sex –Genotype –Herd Random effects –Animal –Litter

5 Methods Genetic trend decomposition – Gorjanc, G., Potočnik K., García-Cortés L. A., Jakobsen, J., Dürr, J. 2011. Partitioning of International Genetic Trends by origin in Brown Swiss Bulls. Interbull Bulletin, 44, 81-86. ) Softwares –PEST, VCE, R-Project

6 Descriptive statistics (Pietrain) VariableMeanSDMinMax LMP61.72.1052.768 ADG52760.5283774 Age17623.2120295 LMP, lean meat percentage %; ADG, average daily gain; AGE, age

7 Descriptive statistics (Duroc) VariableMeanSDMinMax LMP58.21.8750.066.8 ADG55756.6318756 Age17521.7120285 LMP, lean meat percentage %; ADG, average daily gain; AGE, age

8 Descriptive statistics (Cross) VariableMeanSDMinMax LMP59.72.0252.566 ADG56667.9317764 Age17521.6120282 LMP, lean meat percentage %; ADG, average daily gain; AGE, age

9 LMP: variance component ratios ADGADG ADGADG ADGADG LMPLMP LMPLMP LMPLMP Genetic trends for ADG and LMP were 0.4 g/day and -0.004 %,

10 Partitioning of the genetic trend by genotype for average daily gain (g/day) (10, Duroc;12, Pietrain; 34, Pietrain × Duroc)

11 Partitioning of the genetic trend by genotype for lean meat percentage (%) (10, Duroc;12, Pietrain; 34, Pietrain × Duroc)

12 Conclusions Observed progress in both traits was low As selection is now based on BLUP increased genetic trends are expected in the future Application of trend decomposition is advocated for the different crosses

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