Table 1.
Predictive variables studied to identify resistance against GIN in pregnant and lactating Pelibuey ewes naturally infected during grazing under humid tropic conditions.
| Reproductive stage | Weeks | N | FEC | PCV % | PEC cell 103/μl | PP g/dL | IgA % | BCS | ||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Mean | SE | Mean | SE | Mean | SE | Mean | SE | Mean | SE | Mean | SE | |||
| Gestation | Early | 47 | 32.0 | 25.1 c | 30.2 | 0.6 b | 0.021 | 0.001 d | - | - | - | - | 3.1 | 0.1 a |
| Mid | 166.9 | 71.4 c | 34.2 | 0.7 a | 0.023 | 0.001 d | 7.00 | 0.08 a | - | - | 3.0 | 0.0 ab | ||
| Late | 518.0 | 139.8 b | 29.0 | 0.5 bc | 0.428 | 0.033 c | 6.86 | 0.07 a | 10.4 | 1.1 b | 3.0 | 0.0 ab | ||
| Lactation | Early | 47 | 1572.8 | 386.6 a | 27.9 | 0.6 cd | 0.538 | 0.043 c | 6.57 | 0.08 b | 10.6 | 1.8 b | 3.0 | 0.0 ab |
| Mid | 650.1 | 253.2 b | 26.4 | 0.7 de | 0.776 | 0.054 b | 6.59 | 0.08 b | 18.0 | 2.3 a | 2.9 | 0.1 b | ||
| Late | 322.5 | 201.8 c | 25.5 | 0.6 c | 0.990 | 0.066 a | 6.37 | 0.08 b | 14.7 | 2.4 a | 2.7 | 0.1 c | ||
[i] FEC: Fecal egg count; PCV: Packed Cell Volume; PEC: Peripheral Eosinophil Count; PP: Plasmatic Protein; IgA: Immunoglobulin A; BCS: Body Condition Score; SE: Standard Error. Different letter in the same column means statistical difference P<0.05; - values of PP and IgA not obtained in these periods.
Fig. 1.
Means and standard error of back transformed fecal egg count (FEC; mean ± SE) from Pelibuey ewes classified as resistant, intermediate, and susceptible to GIN infection during pregnancy (early, mid and late) and lactation stages (early, mid and late) during grazing in humid tropic conditions.
Table 2.
Predictive variables to classify Pelibuey ewes resistant against GIN according to the type of lambing under natural conditions of humid tropic of Mexico.
| Variables | Single (n=20) | Double (n=27) | ||||
|---|---|---|---|---|---|---|
| N | Mean | SE | N | Mean | SE | |
| FEC | 117 | 331 | 68 b | 161 | 605 | 95 a |
| PCV % | 30.3 | 0.4 a | 28.0 | 0.4 b | ||
| PEC cell 103/μl | 0.491 | 0.045 a | 0.437 | 0.035 a | ||
| PP g/dL | 6.78 | 0.05 a | 6.59 | 0.05 b | ||
| IgA % | 15.2 | 1.4 a | 12.0 | 1.0 a | ||
| BCS | 3.0 | 0.0 a | 3.0 | 0.0 a | ||
[i] FEC: Fecal egg count; PCV: Packed Cell Volume; PEC: Peripheral Eosinophil Count; PP: Plasmatic Protein; IgA: Immunoglobulin A; BCS: Body Condition Score; SE: Standard Error. Different letter in the same row means statistical difference P<0.05.
Table 3
Sensitivity, specificity, predictive positive and negative values, the proportion of positive and false, accuracy and J of Youden (concordance) of Pelibuey ewes classified susceptible or resistant against GIN during early, mid and late pregnancy and lactation periods.
| Variable | Pregnancy | Lactation | ||||
|---|---|---|---|---|---|---|
| Early | Mid | Late | Early | Mid | Late | |
| Sensitivity (Se) | 100 % | 100 % | 100 % | 100 % | 94.4 % | 72.2 % |
| Specificity (Sp) | 31.0 % | 75.9 % | 79.3 % | 100 % | 100 % | 100 % |
| Predictive Positive Value | 47.4 % | 72.0 % | 75.0 % | 100 % | 100 % | 100 % |
| Predictive Negative Value | 100 % | 100 % | 100 % | 100 % | 96.7 % | 85.3 % |
| Proportion of false positive | 69.0 % | 24.1 % | 20.7 % | 0 % | 0.0 % | 0 % |
| Proportion of false negative | 0 % | 0 % | 0 % | 0 % | 5.6 % | 27.8 % |
| Accuracy | 57.4 % | 85.1 % | 87.2 % | 100 % | 97.9 % | 89.4 % |
| Youden's J | 0.3 | 0.8 | 0.8 | 1.0 | 0.9 | 0.7 |
[i] The data were not transformed.