Resumen

ARBUES, R. et al. Evaluación de diferentes dosis de gonadotrofina coriónica equina en el protocolo de sincronización de celo en ovejas. Rev. vet. [online]. 2018, vol.29, n.2, pp.104-108. ISSN 1669-6840.  http://dx.doi.org/10.30972/vet.2923273.

In order to evaluate different doses of equine chorionic gonadotropin effects in the synchronization protocol of Santa Inês ewes in subtropical Argentina, 55 sheep were synchronized. Treated females received intravaginal sponges containing progestagen for 5 days, after this period sponges were withdrawn and animals were divided into two treatments. T1 received 200 and T2 300 UI de eCG, respectively. In the afternoon sheeps and rams were located together and observation of the service began. The parameters assessed were interval to heat and frequency of females in heat. Seven and thirty days after the service ultrasound was performed to determine the presence of corpus luteum (CL) and gestation. The statistical analysis was made by frequency tables, ANOVA and Chi2 (p<0,05). Results indicate that 76,36% of treated ewes showed estrus, 85,2% in T1 and 67,85% in T2, with no significant difference (p>0,05). The interval to heat was different between treatments (p<0,05). In the T1 estrous were concentrated between 48 and 60 h after its end, while in T2 this occurred between 24 and 36 h. From those females that ovary could be located by ultrasound, in T1 79% presented 1 CL, 10.5% 2 CL and 10.5% only follicles; for T2 these percentage were 69%, 25% and 6,3%, respectively (p>0,05). Regarding pregnancy, in T1 66.6% had simple pregnancy and 11.11% had double pregnancy, while in T2 values were 60.71% and 17.9% for single and double pregnancy, respectively (p>0,05). It is concluded that, in Santa Inês ewes of Argentinean subtropical region, doses of 200 and 300 IU of eCG allow to obtain percentages of estrus superior to 67%, and that 300 IU cause the presentation of earlier estrus.

Palabras clave : argentine subtropical; small ruminant; estrous; corpus luteum; ultrasound.

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