Title
Chronology of early embryonic development and embryo uterine migration in alpacas
Date Issued
01 March 2013
Access level
metadata only access
Resource Type
journal article
Author(s)
Publisher(s)
Elsevier
Abstract
The objectives were to: (1) describe the chronology of early embryonic development from ovulation to entry into the uterus; and (2) to determine the timing of embryo migration to the left uterine horn when ovulation occurred from the right ovary. The experiment was conducted in Peru. Females (n = 132) were randomly assigned to 15 experimental groups. All females were mated to an intact male, given 50 μg GnRH im (Cystorelin) and ovulation time determined by transrectal ultrasonography, conducted every 6 hours, starting 24 hours postmating. Animals were slaughtered at a specific intervals postovulation and reproductive tracts were recovered and subjected to oviductal and uterine flushing for females slaughtered between 1 and 6 days postovulation (dpo; Day 0 = ovulation) and uterine flushing for females slaughtered from 7 to 15 dpo for recovery of oocytes/embryos. Season of mating did not influence the interval from mating to ovulation (winter: 29 ± 6 hours vs. summer: 30 ± 6 hours; P = 0.49). Ovulation rates for females mated during winter and summer were 92% versus 100%, respectively (P = 0.05). Fertilization rates for winter and summer mated females were 72% and 82% (P = 0.29). Unfertilized ova were not retained in the uterine tube. All embryos collected were in the uterine tube ipsilateral to the side of ovulation between 1 and 5 dpo. Embryos reached the uterus on 6 dpo. Embryos began to elongate on 9 dpo; at this time, 83% of embryos derived from right-ovary ovulations were collected from the left uterine horn. Embryos occupied the entire uterine cavity by 10 dpo. In conclusion, we characterized early embryo development and location of embryo during its early developmental stages in alpaca. This was apparently the first report regarding chronology of embryo development and migration to the left horn in alpaca which merits further investigation regarding its role in maternal recognition of pregnancy. © 2013 Elsevier Inc.
Start page
702
End page
708
Volume
79
Issue
4
Language
English
OCDE Knowledge area
Crías y mascotas Ciencia veterinaria
Scopus EID
2-s2.0-84873140939
PubMed ID
Source
Theriogenology
ISSN of the container
0093691X
Sponsor(s)
College of Veterinary Medicine, Purdue University The authors thank the Department of Veterinary Clinical Sciences, College of Veterinary Medicine, Washington State University, for financial support for this research.
Sources of information: Directorio de Producción Científica Scopus