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

C. V. Zaragoza-Vera

Zaragoza-Vera, C. V.

,

R. Gonzalez-Garduño

Gonzalez-Garduño, R.

,

G. Arjona-Jimenez

Arjona-Jimenez, G.

,

M. Zaragoza-Vera

Zaragoza-Vera, M.

,

A. J. Aguilar-Caballero

Aguilar-Caballero, A. J.

oraz

O. M. Torres-Chable

Torres-Chable, O. M.

31 gru 2023

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

Tom 60 (2023): Zeszyt 4 (Grudzień 2023)

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Data publikacji: 31 gru 2023

Zakres stron: 348 - 356

Otrzymano: 25 sty 2023

Przyjęty: 27 paź 2023

DOI: https://doi.org/10.2478/helm-2023-0038

Słowa kluczowe
Gestation, Lactation, FEC, PCV, Eosinophils, Pelibuey

© 2023 C. V. Zaragoza-Vera et al., published by Sciendo

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.

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

Język:: Angielski

Częstotliwość wydawania:: 4 razy w roku
Dziedziny czasopisma:: Nauki biologiczne, Zoologia, Ekologia, Nauki biologiczne, inne, Medycyna, Medycyna kliniczna, Mikrobiologia, wirusologia i epidemiologia

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