Estudio de la correlación genética entre clasificación por tipo y pedigree en vacas Jersey destinadas a show

Abstract

The objective of this research was to study the genetic correlation that exists between classification by type and pedigree in Jersey show cows of "Los Nevados de Fantasía Cía. Ltd” Company in Pichincha Province. For which a sample of 20 specimens was considered by discard that were selected due to their different participations in the fairs of the country and for belonging to show families. The same that were submitted to the evaluation according to the 21 characteristics of type of the breed, such as: medial suspensory ligament, anterior udder insertion, udder height, udder depth, anterior and posterior teat placement, rear udder width, udder inclination, teat length, angularity, hind legs (rear and lateral view), hoof angle, locomotion, stature, body depth, strength, body condition, rump angle and width, and coxofemoral position. After this evaluation, the correlation study between dairy traits and the type variable was carried out by means of Pearson's correlation coefficient 0.025 and for progeny it was 0.006. These characteristics demonstrated that the variables maintain an independent correlation. Within the study, zoomometric measurements were taken on the Jersey cattle, such as height at the withers, height at the hip, thoracic perimeter, rump width, rump length, cane perimeter, among others. The conclusion is that correlations can influence the efficacy of genetic improvement programs in Jersey show cows. A high genetic correlation between progeny and parents would indicate that proper selection can have a significant impact on the improvement of offspring type.