Seasonal prevalence and mean intensity of <i>Psoroptes ovis</i> infestation in goats in the Brazilian semiarid region

Amorim, Malba Gean Rodrigues de; Azevedo, Sérgio Santos; Riet-Correa, Franklin

doi:10.1590/S1984-29612014094

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Revista Brasileira de Parasitologia Veterinária

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Original Article • Rev. Bras. Parasitol. Vet. 24 (1) • Jan-Mar 2015 • https://doi.org/10.1590/S1984-29612014094 copy

Seasonal prevalence and mean intensity of Psoroptes ovis infestation in goats in the Brazilian semiarid region

Prevalência sazonal e intensidade média de infestação por Psoroptes ovis em caprinos no semiárido Brasileiro

Authorship SCIMAGO INSTITUTIONS RANKINGS

To determine the prevalence and seasonal variation of Psoroptes ovis (Delafond, 1858) mange in goats in the semiarid region of Paraíba, 541 crossbred goats of both sexes and different ages were examined between June 1999 and May 2001 and between August 2011 and December 2012, by washing their ear canals. The monthly prevalence of the infestation varied between 66.66% and 100% without significant differences (p = 0.10) among months and years. The intensity of infestation was higher between 2011–2012 (p < 0.05), with an annual rainfall of 123 mm, than between 1999-2000, which had an annual rainfall of 614.9 mm. By the Spearman test there was a negative correlation between the relative humidity and the rainfall of the intensity of the P. ovis infestation. It is concluded that parasitism by P. ovis occurs at a similar prevalence rate during the entire year but increases during dry years.

Mite; goats; prevalence; Psoroptes; semiarid

Year
1999-2000				2000-2001					2011-2012
Month	Positive conducts	Prevalence (%)	Average infestation intensity	Total of mites	Positive conducts	Prevalence (%)	Infestation intensity	Total of mites	Positive conducts	Prevalence (%)	Infestation intensity	Total of mites
Jun	11	73.3	140.8	1549	11	73.3	98.4	1083	-	-	-	-
Jul	12	66.6	88.1	1058	13	86.6	93.3	1214	-	-	-	-
Aug	12	80	98.1	1178	14	93.3	81.0	1134	11	73.3	160.1	1762
Sept	13	80	121.6	1582	13	86.6	137.2	1784	15	100	223.4	3351
Oct	15	100	164.5	2468	14	93.3	137.2	1922	11	73.3	141.6	1558
Nov	14	93.3	71.8	1006	14	93.3	112.8	1580	13	86.6	113.30	1473
Dec	13	86.6	69.9	909	12	80.0	184.5	2214	12	80	195	2340
Jan	14	80	80.7	969	15	100.0	326.4	4897	14	93.3	130.1	1822
Feb	13	93.3	78.5	1100	11	73.3	182.0	2003	15	100	89.1	1337
Mar	12	80	69.8	908	15	100.0	74.0	1111	15	100	59.1	887
Apr	13	73.3	77.6	932	15	100.0	149.0	2235	12	80	76.3	916
May	14	86.6	103.3	1343	13	86.6	66.4	864	15	100	105.1	1577
Jun	-	-	-	-	-	-	-	-	12	80	134.2	1611
Jul	-	-	-	-	-	-	-	-	14	93.3	133.4	1868
Aug	-	-	-	-	-	-	-	-	14	93.3	154.7	2166
Sept	-	-	-	-	-	-	-	-	15	93.3	150.0	2250
Oct		-	-	-	-	-	-	-	15	100	313.4	4701
Nov	-	-	-	-	-	-	-	-	15	100	222.6	3340
Dec	-	-	-	-	-	-	-	-	13	86.6	304.0	3952
Total	154			15002	160			22041				36911
Median±DI		80.0 ± 9.95^a	88.2±25.6 ^a			90.0 ±9.95 ^a	137.2±55.6 ^ac			93.3 ± 20 ^a	145.8 ± 68.8 ^c

Correlations	YEAR
	1999-2001			2011-2012
	r (IC 95%)	r₂	P	R (IC 95%)	r₂	P
Prevalence X PP (mm)	0.31 (–0.11 a 0.63)	0.09	0.14 ns^a	–0.29 ( –0.68 a 0.22)	0.08	0.25ns
Prevalence X UR (%)	–0.07 (–0.44 a 0.34)	0.005	0.72ns	–0.04 (–0.52 a 0.44)	0.002	0.85ns
Prevalence X T(ºC)	0.28 (0.14 a 0.62)	0.28	0.18 ns	0.14 (–0.36 a 0.69)	0.02	O.56ns
Infestation intensity X PP(mm)	–0.26 (–0.61 a 0.15)	0.07	0.20ns	–0.57 (–0.83 a –0.12)	0.32	0.01s^b
Infestation intensity X UR (%)	–0.45 (–0.72 a –0.06)	0.20	0.02 s	–0.61 (–0.85 a –0.19)	0.37	0.008s
Infestation intensity X T (ºC)	–0.21 (–0.21 a 0.57)	0.04	0.31ns	0.20 (–0.30 a 0.63)	0.04	0.42ns

Months	Average temperature (ºC)	Average relative humidity (%)	Total precipitation (mm³)
August/2011	26.5	59	7.6
September	29.5	57	0
October	27	54	13.6
November	27	57	15.6
December	28.5	50	0
January/2012	29.5	58	20.7
February	29	59	14.6
March	29.5	56	14.5
April	29	54	14.3
May	29	59	2.7
June	28	64	13
July	27	56	1
August	27.5	54	0
September	28.5	52	0
October	29.5	52	0
November	29.5	49	0
December	30	45	6

Months	Mean temperature (°C)	Mean relative humidity (%)	Total precipitation (mm³)
June/1999	26.7	53	2.5
July	26	54	15.1
August	26.7	48	0
September	28	52	0
October	28.3	45	19.4
November	29.5	46	16.7
December	29.3	52	90.4
January/2000	28	49	40.6
February	28	66	151.3
March	27.7	66	156
April	27.5	68	92
May	27.7	57	30.9
June	27.1	59	0
July	26.8	58	9.1
August	26.9	58	64.2
September	27.1	56	9.9
October	28.4	47	0
November	29.1	45	0.3
December	28.3	50	51.7
January/2001	28.6	46	14.4
February	30	44	7.2
March	27.9	60	171.2
April	26.9	65	169.7
May	28.2	57	11.4

Colégio Brasileiro de Parasitologia Veterinária FCAV/UNESP - Departamento de Patologia Veterinária, Via de acesso Prof. Paulo Donato Castellane s/n, Zona Rural, , 14884-900 Jaboticabal - SP, Brasil, Fone: (16) 3209-7100 RAMAL 7934 - Jaboticabal - SP - Brazil
E-mail: cbpv_rbpv.fcav@unesp.br

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[1] *Corresponding author: Franklin Riet-Correa, Hospital veterinário – HV, Universidade Federal de Campina Grande – UFCG, CEP 58700-000, Patos, PB, Brasil, e-mail: franklin.riet@pq.cnpq.br