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Centro de Investigaciones Regionales Dr. Hideyo Noguchi, Universidad Autónoma de Yucatán

1999, Number 4

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Rev Biomed 1999; 10 (4)

Pregnancy diagnosis in criollo goats (Capra hircus) through blood levels of progesterone and real-time ultrasonography

Ortega-Pacheco A, Montes-Pérez R, Torres-Acosta JF, Aguilar-Caballero A, Avalos-Borges E

Language: Spanish
References: 16
Page: 229-234
PDF size: 66.33 Kb.


ABSTRACT

Background. Pregnancy diagnosis is an important zootechnical practice necessary to mantain the high efficiency of a livestock production system. There are two very efficient techniques to detect pregnancies in goats: real-time ultrasonography and determination of progesterone concentrations. The objective of this study was to evaluate the accuracy of both techniques on day 21 postservice.
Material and methods. Blood samples were taken from 29 criollo goats 21 days postservice and blood levels of progesterone were measured by ELISA. At the same time an ultrasonographic examination was performed to every dam using the transrectal and transabdominal techniques. Results obtained were compared with kidding of studied goats.
Results. Progesterone measured sho wed an eficiency of 62.07%, sensitivity of 86.66%, specificity of 35.71%, positive predictive value (PPV) of 59.09% and negative predictive value (NPV) of 71.43%. The transabdominal and transrectal techniques for the ultrasonic detection of pregnancy has an eficiency, sensitivity, specificity, PPV and NPV of 51.72 and 58.62%, 31.25 and 68.75%, 76.92 and 46.15%, 62.5 and 61.11, 47.62 and 54.54% respectively.
Discussion. Results showed that progesterone is better than ultrasonography to detect pregnant females 21 days postservice with a high probability to accurately determine non pregnant females when the diagnosis of pregnancy is negative. Between the ultrasonographic techniques, the transrectal is more accurate to detect early pregnancies. High embryo mortality seems to be an important reason for the diagnosis of false positive pregnancies.


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