Analysis of inbreeding and average relationship in Hungarian Hucul horse population

This study presented at the 27th Annual Meeting of Dagene in April 2016 focuses on the genetic structure of the Hungarian Hucul horse population based on pedigree data. The research analyzed inbreeding coefficients and average relatedness using the Endog software to understand the breeding strategies and maintain diversity within the population. Results show varying levels of inbreeding in mare families and stallion lines, highlighting the importance of genetic management in small populations.

• Genetic structure
• Pedigree data
• Inbreeding analysis
• Hungarian Hucul horse
• Population genetics

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1. 27THANNUAL MEETING OF DAGENE 23THOF APRIL 2016 ANALYSIS OF INBREEDING AND AVERAGE RELATIONSHIP OF THE PRESENT HUNGARIAN HUCUL HORSE POPULATION Enik Somogyv ri Phd Student UNIVERSITY OF DEBRECEN Faculty Of Agricultural And Food Sciences And Environmental Management Enik Somogyv ri - S ndor Mih k - J nos Posta

2. INTRODUCTION THE GENETIC STRUCTURE OF THE HUNGARIAN HUCUL POPULATION BASED ON PEDIGREE DATA (POPULATION GENETIC METHODS). IN SMALL POPULATION EXAMINATIONS INCREASINGLY JUSTIFIED AND FREQUENT. THESE CALCULATIONS HELP IN THE BREEDING PROGRAMMES. THEY MAY SET THE DIRECTIONS OR EVEN THE EXTENT OF THE MODIFICATIONS. THE POPULATIONS, AVOID CLOSE BREEDING OR SUGGEST MATING SYSTEMS. NECESSITY OF SUSTAINING DIVERSITY WITHIN THE

3. MATERIAL AND METHODS THE PEDIGREE INFORMATION OF THE HUNGARIAN HUCUL HORSE. PEDIGREE INFORMATION OF THE BREED UP TO 2015. 2015 AS REFERENCE POPULATION. THE PEDIGREE INFORMATION OF 3,002 HORSES. THE INBREEDING COEFFICIENT, AVERAGE RELATEDNESS ENDOG SOFTWARE (GUTI RREZ AND GOYACHE, 2005).

4. MATERIAL AND METHODS THE ENDOG SOFTWARE CALCULATES USING WRIGHT S FORMULA (1922) WHERE THE INBREEDING COEFFICIENT OF A GIVEN INDIVIDUAL (X) IS: FX= (1/2)N+N +1 (1+FA) THE ENDOG SOFTWARE CALCULATES AVERAGE RELATEDNESS WITH AN ALGORITHM MADE BY COLLEAU (2002). IT SHOWS THE LIKELIHOOD OF AN ALLELE RANDOMLY CHOSEN FROM THE PEDIGREE CHARACTERISING THE WHOLE POPULATION BELONGING TO AN INDIVIDUAL.

5. RESULTS

6. AVERAGE INBREEDING COEFFICIENTS OF MARE FAMILIES 16 The smallest inbreeding 4.62% (Aspir ns) 14.78 The highest inbreeding 14.78% (3 Tatarca) 14 Followed by 17 Aglaia (11.35%), 2 Lucina (10.05%) Inbreeding coefficients (%) 12 11.35 The total population values are below 9 10.05 9.84 10 9.07 8.83 8.61 8.55 7.7 8 6.55 6.11 5.84 5.73 5.62 6 5.48 5.21 5.11 4.62 4 2 6.3 8.42 6.86 5.93 6.52 5.35 7.84 5.85 4.73 5.43 7.1 2.33 5.16 5.24 4.67 5.14 4.16 6.29 0 1 Panca 11 12 Sarata 17 Aglaia 2 Lucina 3 Tatarca 4 Kitca 5 Plosca 70 825 Agla 86 882 Gelnica 90 rv cska Aspir ns Bukovina Wrona Wydra Rotunda Sekacka Deremoxa Machocha reference population total population Mare families

7. AVERAGE INBREEDING COEFFICIENTS OF STALLION LINES The smallest coefficient 1.76% Afew animals from the Polan strain The highest inbreeding 10.82% Pietrosu line 12 10.82 10 Inbreeding coefficients (%) 9.08 8.89 8 7.88 7.74 6.91 7.07 5.76 6 6.29 5.48 5.41 4.65 4 1.76 2 2.11 0 Goral Gurgul Hroby Ousor Pietrosu Polan Prislop Stallion lines reference population total population

8. AVERAGE RELATEDNESS OF MARE FAMILIES Most of the families in reference population above 13% The smallest average relationship 8.35% (90 Machocha) 3 Tatarca average relationship 15.03% 16 15.03 14.51 14.32 14.29 14.12 14.03 13.78 13.62 13.6 14 12.39 Average relatedness (%) 12 12 11.27 11.04 10 9.76 10 9.38 8.38 8.35 8 6 4 2 12.41 13.14 12.9 11.79 12.08 12.07 13.45 11.41 8.09 9.37 13.3 11.94 7.35 11.29 10.95 9.59 6.07 6.7 0 1 Panca 11 12 Sarata 17 Aglaia 2 Lucina 3 Tatarca 4 Kitca 5 Plosca 70 Sekacka 825 Agla 86 882 Gelnica 90 rv cska Aspir ns Bukovina Wrona Wydra Rotunda Deremoxa Machocha Mare families reference population total population

9. AVERAGE RELATEDNESS OF STALLION LINES The smallest 9.4% Gurgul, 13.87% highest for the Pietrosu 16 13.87 13.85 13.71 14 12.99 12.48 12.97 12.76 12 12.34 11.62 10.44 10.98 Average relatedness(%) 10 9.4 9.01 8 7.54 6 4 2 0 Goral Gurgul Hroby Ousor Pietrosu Polan Prislop Stallion lines reference population total population

10. CONCLUSION AND RECOMMENDATION THE INCREASING OF THE INBREEDING LEVEL OF THE POPULATION THE INBREEDING COEFFICIENT OF THE TOTAL POPULATION 5.65%, THE AVERAGE RELATIONSHIP 10.55%. THE POPULATION 6.8%, THE AVERAGE RELATIONSHIP 12.7%. INBREEDING COEFFICIENT OF THE REFERENCE THE GENETIC DIVERSITY OF THE HUNGARIAN HUCUL HORSE BREEDING STOCK IS FAVOURABLE

11. Thank you for your attention!