Ovarian response and embryo production in llamas treated with equine chorionic gonadotropin alone or with a progestin-releasing vaginal sponge at the time of follicular wave emergence.
The objective of the study was to compare the ovulatory response and embryo production in llamas (Lama glama) treated with a single dose of equine chorionic gonadotropin (eCG) alone or combined with intravaginal medroxyprogesterone acetate (MPA) at the time of follicular wave emergence. Llamas with a growing follicle >or=7 mm in diameter were assigned to one of the following groups: (1) Control (n=28): Nonstimulated llamas were mated and embryos were collected 7 d after mating. (2) eCG (n=32): Llamas were given 5mg luteinizing hormone (LH) (Day 0) to induce ovulation, 1000 IU eCG on Day 2, a luteolytic dose of prostaglandin F(2alpha) on Day 6, mating on Day 7, and embryo collection on Day 14. (3) eCG+MPA (n=34): Llamas were treated as those in the eCG group, but a sponge containing 60 mg MPA was placed intravaginally from Days 2 to 6. Llamas that did not respond to synchronization or superstimulation were excluded, leaving data from n=26, 26, and 27 in the control, eCG, and eCG+MPA groups, respectively, for statistical analysis. The mean (+/-SD) number of follicles>7 mm at the time of mating was greatest in the eCG group, intermediate in the eCG+MPA group, and lowest in the control group (16.6+/-5.3, 12.9+/-3.7, and 1.0+/-0.0, respectively, P<0.001). The number of corpora lutea was similar between eCG and eCG+MPA groups (10.1+/-2.9 and 8.6+/-3.7, respectively); both were higher (P<0.001) than in controls (0.9+/-0.3). The number of embryos did not differ significantly between the eCG and eCG+MPA groups (4.8+/-2.8 and 3.5+/-3.0, respectively), but both were higher (P<0.001) than in the controls (0.7+/-0.4). In conclusion, eCG, with or without MPA effectively induced a superovulatory response and multiple embryo production in llamas.
Huanca
W
W
Laboratory of Animal Reproduction, Universidad Mayor Nacional de San Marcos, Lima, Peru.
Cordero
A
A
Huanca
T
T
Cardenas
O
O
Adams
G P
GP
Ratto
M H
MH
D000818:Animals; D002161:Camelids, New World / Q000196:embryology / Q000502:physiology*; D006063:Chorionic Gonadotropin / Q000494:pharmacology*; D003274:Contraceptive Devices, Female; D004622:Embryo, Mammalian; D047108:Embryonic Development / Q000187:drug effects*; D005260:Female; D006736:Horses; D017258:Medroxyprogesterone Acetate / Q000008:administration & dosage / Q000494:pharmacology*; D006080:Ovarian Follicle / Q000187:drug effects / Q000254:growth & development; D010053:Ovary / Q000187:drug effects*; D010062:Ovulation Induction / Q000379:methods / Q000662:veterinary; D011372:Progestins / Q000008:administration & dosage / Q000494:pharmacology*
D006063:Chorionic Gonadotropin; D011372:Progestins; D017258:Medroxyprogesterone Acetate