Efecto del nivel de suplementación con propilenglicol durante el período de transición a la lactancia sobre actividad ovárica y desempeño reproductivo en vacas Holstein
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Date
2017
Journal Title
Journal ISSN
Volume Title
Publisher
Corporación Universitaria Lasallista
Abstract
Introduction. This paper mainly focuses on the study
of the inclusion of propylene glycol (PG) as energy
compound and its possible effect on minimizing
the negative energy balance. Objetive. Evaluate
on reproductive parameters, specifically on rates
of calving to first service, days open, calving to first
observed heat, as well as its effect on insulin secretion
and ovarian activity. Materials and Methods.
20 Holstein cows were assigned to one of four
supplementation levels: 0, 300, 500 and 700 grams
of PG / day mixed in food, from day 10 prepartum
and through day 20 postpartum. Blood samples were
collected on 10 and 5 prepartum and days 0, 5, 10
15 and 20 postpartum to determine the concentration
of insulin were also done to determine transrectal
ultrasound follicular growth and ovarian resumption.
All data for the evaluation of reproductive parameters
were taken from the day of delivery, making daily
observations of animals 30 minutes in the morning
and 30 minutes in the afternoon to record possible
heat presented. Results. There were no significant
differences for the variables within the different
treatments (p> 0.05), only a trend to decrease the
open days when you include a dose of 500 g of
propylene glycol with respect to the other groups.
Conclusions. The inclusion of propylene glycol
had no significant effect on insulin secretion, or the
number and size of preovulatory follicles (p> 0.05). It
is very likely that the propylene supply mode and time
of collection of blood samples affect the id
Description
Keywords
Corporación Universitaria Lasallista, Vacas Holstein, Ganado - Reproducción, Ganado de leche, Ganado lechero - Cría y desarrollo, Propilenglicol