Optimum timing for assessing phenotypic resistance against gastrointestinal nematodes in Pelibuey ewes Cover

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Optimum timing for assessing phenotypic resistance against gastrointestinal nematodes in Pelibuey ewes

Volume 60 (2023): Issue 4 (December 2023)

By: C. V. Zaragoza-Vera, R. Gonzalez-Garduño, G. Arjona-Jimenez, M. Zaragoza-Vera, A. J. Aguilar-Caballero and O. M. Torres-Chable

Open Access

|Dec 2023

Figures & Tables

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.

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

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

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

DOI: https://doi.org/10.2478/helm-2023-0038 | Journal eISSN: 1336-9083 | Journal ISSN: 0440-6605

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Language: English

Page range: 348 - 356

Submitted on: Jan 25, 2023

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Accepted on: Oct 27, 2023

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Published on: Dec 31, 2023

Published by: Slovak Academy of Sciences, Institute of Parasitology

In partnership with: Paradigm Publishing Services

Publication frequency: Volume open

Keywords:

Related subjects:

Life sciences, other,

Clinical medicine,

Microbiology, virology and infection epidemiology

© 2023 C. V. Zaragoza-Vera, R. Gonzalez-Garduño, G. Arjona-Jimenez, M. Zaragoza-Vera, A. J. Aguilar-Caballero, O. M. Torres-Chable, published by Slovak Academy of Sciences, Institute of Parasitology
This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 License.

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