Avaliação do método FAMACHA© para detecção de anemia por Haemonchus contortus em rebanhos caprinos e ovinos
The aim of the present study was to compare the sensitivity and specificity of the FAMACHA© method in the detection of Haemonchus contortus anemia in goats and sheep. For this, goats and sheep from Embrapa Caprinos e Ovinos and from EAJ/UFRN, consisting of 264 crossbred sheep and 256 crossbred go...
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| Formato: | Dissertação |
| Idioma: | pt_BR |
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| Endereço do item: | https://repositorio.ufrn.br/jspui/handle/123456789/27045 |
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| Resumo: | The aim of the present study was to compare the sensitivity and specificity of the
FAMACHA© method in the detection of Haemonchus contortus anemia in goats and
sheep. For this, goats and sheep from Embrapa Caprinos e Ovinos and from
EAJ/UFRN, consisting of 264 crossbred sheep and 256 crossbred goats were
evaluated for a period between 98 and 225 days, totaling 4568 observations for
sheep and 825 for goats. Four standard values of globular volume (PCV) ≤15%,
≤18%, ≤19%, ≤22%, were used to confirm anemia. Specificity (Sp) and sensitivity
(Se) were determined. The ratio between FAMACHA©
, PCV and egg counts per
gram of faeces (OPG) was calculated using the Spearman correlation coefficient. To
evaluate the concordance between FAMACHA©
and PCV, the Kappa value (Ƙ) was
calculated. In all PCV cut-off points, FAMACHA© Se in Embrapa Caprinos e Ovinos
sheep increased when FAMACHA©
3 animals were included as anemic (75% to
92%). Sp was higher in goats than in sheep at all PCV cut-off points when
FAMACHA©
3 animals were not included as anemic (99.4% and 99.8%). For the
EAJ/UFRN sheep herd, higher values of Se were observed when FAMACHA©
3
animals were included as anemic (48.5% to 51%). The Sp of these animals ranged
from 88.1% to 90.1% when FAMACHA©
3 animals were not included as anemic. The
evaluation of the FAMACHA© method for the goats of the EAJ/UFRN was not
significant, since the parasite load of H. contortus did not reach the recommended
minimum of 60%. The highest correct grading values were found at all PCV cut-off
points for both Embrapa Caprinos e Ovinos herds when FAMACHA©
4 and 5 were
considered positive for anemia (75.7% to 91% for sheep and 82.1% % to 98.5% for
goats). In the sheep of the EAJ/UFRN the highest values of correct classification
were found when FAMACHA©
3 animals were not included as anemic (65.13% to
78.2%). The valor value for sheep of the Embrapa Caprinos e Ovinos herd ranged
from 0.320 < Ƙ < 0.560, higher when the FAMACHA©
3 category was not included as
positive for anemia, indicating a reasonable to moderate agreement. For goats, the
value Ƙ = 0.620 for the PCV ≤19 was observed, with substantial agreement being
obtained. In the EAJ/UFRN herd, Ƙ values indicated a reasonable concordance for
sheep (0.067 < Ƙ < 0.074) and poor agreement for goats (Ƙ ≤ 0.02, p> 0.05). These
results corroborate the applicability of the FAMACHA© method in cases of
haemocose in both herds. The PCV ≤15 cutoff point proved to be quite adequate for both species because it has high sensitivity indexes, but studies aiming at a better
standardization of PCV cut values in goats are still necessary to increase the Se of
the method for this species. |
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