EFECTO DEL ESTRADIOL EN EL PERIODO DE RECONOCIMIENTO MATERNAL DE LA PREÑEZ SOBRE LA SUPERVIVENCIA EMBRIONARIA EN ALPACAS
DOI:
https://doi.org/10.15381/rivep.v14i2.1615Keywords:
oestradiol, alpaca, maternal recognition, corpus luteumAbstract
The effect of oestradiol (E2 ) during the maternal recognition of pregnancy (9-11 days after ovulation) was studied in 44 alpacas that were >20 days after delivery. The alpacas were mated with an intact male (>15 minutes) and received 500 IU of hCG to induce ovulation. The females were divided in 3 groups: Group G1 (n=14) received 0.2 ml. i.m. of an A, D and E vitaminic complex on days 8 and 9 post-ovulation. Group G2 (n=15) received 200 mg of E2 and 0.2 ml i.m. of the vitamin complex (similar to G1 ) on days 8 and 9 post-ovulation. Group G3 (n=15) received 20 mg of progesterone and 0.2 ml i.m. of the same vitamin complex on day 9 post-ovulation. The females were confronted with a male to evaluate their sexual behavior (accept or denial) and then, transrectal ecography of the ovaries and uterus was conducted on days 2, 8, 13, 19, 27, 30 and 60 post-ovulation. Embryonic survival was higher in G2 (86.7%) at day 19 in comparison to G1 (57.1%, p<0.08), but without differences with G3 (73.3%). Follicular dinamics in alpacas with embryonic survival was different at day 2 (p<0.1) but not on day 8 relating to those animals with embrionic mortality. The size of the corpus luteum did not have statistical differences between the three groups but was smaller in those with embryonic mortality at day 13 (10.7 ± 1.6 vs. 13.3 ± 1.5, p<0.05) which would show that the luteolisis process began at day 13 in that group. These results suggest that failure in maternal recognition of pregnancy and subsequent embryo mortality were reduced by the oestradiol, and therefore, indicating that oestradiol plays an important role in the process of maternal recognition of pregnancy in alpacas.Downloads
Downloads
Published
Issue
Section
License
Copyright (c) 2003 Ysaac Chipayo G., Víctor Leyva V., Wilber García V.
![Creative Commons License](http://i.creativecommons.org/l/by-nc-sa/4.0/88x31.png)
This work is licensed under a Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International License.
AUTHORS RETAIN THEIR RIGHTS:
a. Authors retain their trade mark rights and patent, and also on any process or procedure described in the article.
b. Authors retain their right to share, copy, distribute, perform and publicly communicate their article (eg, to place their article in an institutional repository or publish it in a book), with an acknowledgment of its initial publication in the Revista de Investigaciones Veterinarias del Perú (RIVEP).
c. Authors retain theirs right to make a subsequent publication of their work, to use the article or any part thereof (eg a compilation of his papers, lecture notes, thesis, or a book), always indicating the source of publication (the originator of the work, journal, volume, number and date).