Browsing by Author "Robinson, Stafford William"
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- ItemThe correlation between inbreeding and performance in the Hanoverian sport horse : a thesis presented for the degree Master of Science in Animal Science at Massey University(Massey University, 2015) Robinson, Stafford WilliamThe aim of this thesis was to examine the relationship between inbreeding and performance in the Hanoverian Sport Horse. A total of 84,724 hanoverian horses born between the years 1990 and 2009 were used for the study, of which 78,907 had their own performance records. Pedigree records were traced back as far as possible, with a maximum of 37 generations used. There was 100% completeness of pedigree up to the grandparent generation for all horses. The majority of horses (80%) had completeness of pedigree past the sixth generation. Inbreeding were calculated using two methods; the Meuwissen method and the van Raden Method. Both methods gave identical results (100% fit). As aquantitative measure of performance, the Integrated Estimated Breeding Value (iEBV), using both breed and competition results was used. The Evaluation was carried out using the BLUP (Best Linear Unbiased Prediction) Multitrait Repeatability Animal Model. Two different GLM were run with the inbreeding coefficient (IBC) modelled as either a continuous variable or as a fixed class of five differing levels of inbreeding (IBC=0.00; 0