Relación del tamaño del folículo dominante y tasa de concepción al momento del servicio en vacas holstein de alta producción
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Date
2015-09-03
Journal Title
Journal ISSN
Volume Title
Publisher
Corporación Universitaria Lasallista
Facultad de Ciencias Administrativas y Agropecuarias
Facultad de Ciencias Administrativas y Agropecuarias
Abstract
Introducción. According to the research
conducted, some correlations between the
dominant follicle´s size and the fertility in high
producing cows have been reported. However,
there are still some knowledge gaps concerning
the effect of follicular dynamics on the
conception. Objective. To identify the correlation
between the dominant follicle size at the artificial
insemination time and the conception rates in
high producing Holstein cows. Material and
methods. 42 high production animals were
evaluated, determining their dominant follicle´s
size at the artificial insemination time and
location (right or left ovaries), body condition
score (BCS) and body weight. The data were
analyzed by means of the Statgraphics software,
version 15; a confidence level of 95% was used
to find significant differences. By adjusting
regression equations, the relationships between
the size of the dominant follicle at the time of
service and the conception rate with the size of
the dominant follicle were established. Results.
A connection between the three average sizes of
the follicles related to the body condition and the
effective service with each one of the weights was
found. As the dominant follicle´s size increased,
so did the effective service percentages but,
when the weights and the body conditions of
the animals increased, the effective service
percentages decreased. The larger the dominant
follicle size, the higher the effective service
percentage. However, if the animal’s weight and
body conditions increase, the effective service
percentage decreases. Conclusions. At the
service time, the follicular diameter is directly
related to the rate of conception, regardless of
the ovary in which the dominant follicle is. This
fact could be considered as a fertility indicator.
Description
Keywords
Corporación Universitaria Lasallista, Facultad de Ciencias Administrativas y Agropecuarias, Inseminación artificial, Ganado Holstein, Ganado - Inseminación artificial, Ganado - Reproducción