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. 2024 Jan-Dec;95(1):e70000.
doi: 10.1111/asj.70000.

Possibility of early pregnancy detection in alpacas (Vicugna pacos) based on fecal steroid hormone concentrations

Toru Egi  1 , Masaaki Hanada  1 , Yuji Tokura  2 , Alejandro Bonifacio Flores  3 , Tomás J Acosta  2
Affiliations

Possibility of early pregnancy detection in alpacas (Vicugna pacos) based on fecal steroid hormone concentrations

Toru Egi et al. Anim Sci J. 2024 Jan-Dec.

Abstract

Early pregnancy detection in alpacas, whose breeding season is limited to the rainy season and has a long gestation period, is important for reproductive management. Conventional detection methods such as ultrasonography cannot be used to detect pregnancy before 30 days after mating. In this study, we examined the feasibility of using fecal steroid hormones as an early detection method in pregnant and non-pregnant alpacas. Fecal and blood samples were collected from pregnant and non-pregnant alpacas after mating. Progesterone (P4) and estradiol 17-β were extracted and quantified from blood and fecal samples. A positive correlation exists between the steroid hormones in serum and feces, indicating that serum steroid hormone concentrations can be estimated from fecal steroid hormones. Within 10 days after mating, both pregnant and non-pregnant alpacas had fecal P4 concentrations greater than 1.0 ng/mg dry matter (DM), but by 15 days after mating, fecal P4 concentrations decreased to the pre-mating concentration in non-pregnant alpacas. From 15 days after mating, non-pregnant alpacas had a low fecal P4 concentration (< 1 ng/mg DM), whereas a high fecal P4 concentration indicated the possibility of pregnancy, suggesting that this test is clinically beneficial as a supportive test for pregnancy detection.

Keywords: Vicugna pacos; early pregnancy detection; fecal steroid hormone.

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References

REFERENCES

    1. Aba, M. A., Kindahl, H., Forsberg, M., Quiroga, M., & Auza, N. (2000). Levels of progesterone and changes in prostaglandin F(2α) release during luteolysis and early pregnancy in llamas and the effect of treatment with flunixin meglumine. Animal Reproduction Science, 59, 87–97. https://doi.org/10.1016/S0378-4320(00)00068-3
    1. Adams, N. R., Abordi, J. A., Briegel, J. R., & Sanders, M. R. (1994). Effect of diet on the clearance of Estradiol‐171 in the Ewe. Biology of Reproduction, 51, 668–674. Available from: https://academic.oup.com/biolreprod/article/51/4/668/2761373. https://doi.org/10.1095/biolreprod51.4.668
    1. Adams, G. P., Griffin, P. G., & Ginther, O. J. (1989). In situ morphologic dynamics of ovaries, uterus, and cervix in llamas. Biology of Reproduction, 41, 551–558. https://doi.org/10.1095/BIOLREPROD41.3.551
    1. Adams, G. P., Matteri, R. L., & Ginther, O. J. (1992). Effect of progesterone on ovarian follicles, emergence of follicular waves and circulating follicle‐stimulating hormone in heifers. Journal of Reproduction and Fertility, 96, 627–640. https://doi.org/10.1530/JRF.0.0960627
    1. Adams, G. P., Ratto, M. H., Huanca, W., & Singh, J. (2005). Ovulation‐inducing factor in the seminal plasma of alpacas and llamas. Biology of Reproduction, 73, 452–457. https://doi.org/10.1095/biolreprod.105.040097

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