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Pedigree analysis and inbreeding effects over morphological traits in Campolina horse population

Published online by Cambridge University Press:  22 February 2018

F. O. Bussiman ,
B. C. Perez ,
R. V. Ventura ,
M. G. C. D. Peixoto ,
R. A. Curi  and
J. C. C. Balieiro
F. O. Bussiman*
Affiliation:
Department of Animal Science, College of Animal Science and Food Engineering, University of São Paulo (FZEA/USP), Av. Duque de Caxias Norte, 225, Campus Fernando Costa, Pirassununga, São Paulo, 13.635-900, Brazil
B. C. Perez
Affiliation:
Department of Animal Science, College of Animal Science and Food Engineering, University of São Paulo (FZEA/USP), Av. Duque de Caxias Norte, 225, Campus Fernando Costa, Pirassununga, São Paulo, 13.635-900, Brazil
R. V. Ventura
Affiliation:
Department of Animal Science, College of Animal Science and Food Engineering, University of São Paulo (FZEA/USP), Av. Duque de Caxias Norte, 225, Campus Fernando Costa, Pirassununga, São Paulo, 13.635-900, Brazil Beef Improvement Opportunities (BIO - AgSights), 294 East Mill Street, Suite 209, Elora, ON, Canada N0B 1S0 Department of Animal and Poultry Science, University of Guelph, 50 Stone Road East, Guelph, ON, Canada N1G 2W1
M. G. C. D. Peixoto
Affiliation:
National Centre of Research on Dairy Cattle, Brazilian Agricultural Research Corporation (CNPGL/EMBRAPA), Rua Eugênio do Nascimento, 610, Dom Bosco, Juiz de Fora, Minas Gerais, 36.038-330, Brazil
R. A. Curi
Affiliation:
Department of Animal Improvement and Nutrition, College of Veterinary Medicine and Animal Science, São Paulo State University (FMVZ/UNESP), Rua José Barbosa de Barros, 1780, Fazenda Experimental Lageado, 18.618-307, Botucatu, São Paulo, Brazil
J. C. C. Balieiro
Affiliation:
Department of Animal Nutrition and Production, College of Veterinary Medicine and Animal Science, University of São Paulo (FMVZ/USP), Av. Duque de Caxias Norte, 225, Campus Pirassununga, Pirassununga, São Paulo, 13.635-900, Brazil
*
†E-mail: fernando.bussiman@usp.br
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Abstract

Genetic improvement, without control of inbreeding, can go to loss of genetic variability, reducing the potential for genetic gains in the domestic populations. The aim of this study was to analyze the population structure and the inbreeding depression in Campolina horses. Phenotype information from 43 465 individuals was analyzed, data provided by the Campolina Breeders Association. A pedigree file containing 107 951 horses was used to connected the phenotyped individuals. The inbreeding coefficient was performed by use of the diagonal of the relationship matrix and the genealogical parameters were computed using proper softwares. The effective population size was estimated based on the rate of inbreeding and census information, and the stratification of the population was verified by the average relationship coefficient between animals born in different regions of Brazil. The effects of inbreeding on morphological traits were made by the use of inbreeding coefficient as a covariate in the model of random regression. The inbreeding coefficient increased from 1990 on, impacting effective population size and, consequently, shrinking genetic variability. The paternal inbreeding was greater than maternal, which may be attributed to the preference for inbred animals in reproduction. The average genetic relationship coefficient of animals born in different states was lower than individuals born within the same state. The increase in the inbreeding coefficient was negatively associated with all studied traits, showing the importance to avoid genetic losses in the long term. Although results do not indicate a severe narrowing of the population until the present date, the average relationship coefficient shows signs of increase, which could cause a drastic reduction in genetic variability if inbred mating is not successfully controlled in the Campolina horse population.

Keywords

population structurecoancestryeffective population sizeinbreeding depressiongaited horse
Type
Research Article
Information
animal , Volume 12 , Issue 11 , November 2018 , pp. 2246 - 2255
Copyright
© The Animal Consortium 2018 

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