首页|Embryo yield in llamas synchronized with two different intravaginal progesterone-releasing devices and superovulated with eCG

Embryo yield in llamas synchronized with two different intravaginal progesterone-releasing devices and superovulated with eCG

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  • NSTL
  • Consejo Superior Investigaciones Cientificas-Csic
The objectives of this study were to compare the effects of two intravaginal devices (ID) containing the same dose (0.5 g) of progesterone (P-4) on subsequent ovarian response, embryo production and circulating P-4 concentration profile in llamas (Lama glama) treated with equine chorionic gonadotropin (eCG) for ovarian superstimulation. Female llamas were randomly assigned (n = 10 llamas per group) to one of the following groups and treated (Day 0) with an ID containing 0.5 g of vegetal P-4 to synchronize the emergence of a new follicular wave: i) DIB 0.5 (R) and ii) Cronipres M15 (R). On Day 3 llamas were intramuscularly treated with 1000 IU of eCG. The IDs were removed on Day 7. Llamas were naturally mated (Day 9) and treated with GnRH analogue to induce ovulation. A second mating was allowed 24 h later. Embryos were collected between 7 and 8 days after the first mating. Blood samples were taken every day from Day 0 to Day 7 to measure circulating P-4 concentrations. The results indicated that DIB device maintained greater plasma P-4 levels as compared to Cronipres until Day 2. However, the mean (+/- SD) number of corpora lutea and recovered embryos was not affected (p < 0.05) by the type of ID (5.3 +/- 2.6 vs 4.2 +/- 2.2 and 3.5 +/- 2.7 vs 2.6 +/- 3.0 for DIB and Cronipres, respectively). In conclusion, both DIB and Cronipres devices can be successfully used to synchronize the emergence of follicular wave prior to a single dose of eCG in superovulation protocol in llamas.

South American camelidssuperovulationhormonal treatmentembryo

Aller, Juan F.、Abalos, Marcos C.、Acuna, Francisco A.、Virgili, Rosana、Requena, Francisco、Cancino, Andrea K.

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INTA, Estn Expt Agr Balcarce, RA-7620 Balcarce, Argentina

INTA, Estn Expt Agr Abra Pampa, RA-4640 Abra Pampa, Jujuy, Argentina

Univ Nacl Jujuy, Fac Ciencias Agr, RA-4600 San Salvador De Jujuy, Argentina

Univ Cordoba, Fac Vet, Cordoba 1471, Spain

INTA, Estn Expt Agr Bariloche, RA-8400 San Carlos De Bariloche, Rio Negro, Argentina

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2015

10.5424/sjar/2015133-7308

Spanish Journal of Agricultural Research

Spanish Journal of Agricultural Research

SCI
ISSN：1695-971X
年,卷(期)：2015.13(3)
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