Year: 2021 | Month: February | Volume 11 | Issue 1
Diagnostic Evaluation of Immunoassay Kits for Early Pregnancy Detection in Cattle
Amit Khatti
Vinothini Prabhakaran
Nitish Singh Kharayat
Priya Ranjan Kumar
Manas Kumar Patra
K Narayanan
Harendra Kumar
Sanjay Kumar Singh
DOI:10.30954/2277-940X.01.2021.4
Abstract:
Diagnosis of pregnancy at an early stage is important for profitable dairy enterprise. The objective of present study was to evaluate diagnostic performance of immunoassay kits used for early pregnancy detection in cattle. Two ELISA based kits were used for detection of pregnancy-associated glycoproteins-1 (PAG-1) and pregnancy-specific protein B (PSP-B). Another RIA based kit was used for the estimation of serum progesterone (P4 ). Ultrasound examination was done in all cows under controlled experimental conditions and used as a reference method. Based on availability of assay points, two pregnant groups of dairy cattle i.e. 30-35D (n=16) and 45-50D (n=10) were included for PAG-1/PSP-B estimation. However, all four Pregnant groups viz., 7-10D (n=11), 17-20D (n=8), 30-35D (n=16) and 45-50D (n=10) and three non-pregnant groups viz., Heifer (n=6), Cyclic Non-AI (n=13) and Post-partum (PP; n=13) were included for progesterone estimation. Ultrasound examination was done at 30- 35D and 45-50D of pregnancy to screen the experimental animals and early pregnancy samples were confirmed retrospectively. Sensitivity of all three immunoassay kits for PAG-1, PSP-B and P4 was reported 92.31%, 96.15% and 84.44%, respectively. Specificity, positive predictive value (PPV), negative predictive value (NPV) and Accuracy for P4 kit were observed 90.63%, 0.93, 0.81 and 87.01%, respectively. However, lack of values in non-pregnant animals in study for the estimation of PAG-1/ PSP-B limits full reflection of diagnostic performance of respective kits. Henceforth, it is recommended to include large number of pregnant as well as non-pregnant animals to conclude comprehensively on the diagnostic performance of these assays
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