Resumen

PINEIRA VARGAS, Jaime Enrique; DIAZ ORTEGA, Matías Alejandro  y  CANCINO LOPEZ, Olga Camila. Genetic relationship between insemination bulls marketed in Chile by two semen suppliers: a case study in Holstein and Angus breeds. Ces. Med. Vet. Zootec. [online]. 2020, vol.15, n.2, pp.38-48. ISSN 1900-9607.  https://doi.org/10.21615/cesmvz.15.2.3.

Artificial insemination (AI) is currently the preferred reproductive management for most cattle farmers working with international cattle breeds likes Holstein Friesian and Aberdeen Angus. In relation to this, several authors have described that over the years there has been an alteration in the production parameters, which would be significantly associated with an increase in the inbreeding degree of the animals. This fact would have its origin at the genetic nucleus level, in which improvement programs are carried out, due to the small number of family lines which the animals selected as breeding stock belong to. This study evaluated the degree of kinship between Holstein Friesian and Aberdeen Angus insemination bulls marketed in Chile by two semen distribution companies. A total of 86 bulls available in catalogues until 2017 were studied. The genealogical information of each bull was traced back up to great-great-grandfather and then a consolidated genealogical record was built for each breed. This analysis considered the estimation of each bull’s inbreeding percentage (F) and the construction of a co-ancestry matrix among animals. Results indicated that 99% of Holstein bulls and 79% of Angus bulls, are related to some extent. As a result of the above, it is concluded that is essential that in Chile a program management of genealogical information be initiated to adequately control inbreeding problems that may arise from the use of related animals.

Palabras clave : artificial insemination; inbreeding; inbreeding depression; genealogical record; effective population size..

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