Variation in phenotypic resistance to gastrointestinal nematodes in hair sheep in the humid tropics of Mexico

Zaragoza-Vera, Claudia Virginia; Aguilar-Caballero, A.J.; González-Gardúño, Roberto; Arjona-Jimenez, Guadalupe; Zaragoza-Vera, Maritza; Torres-Acosta, J.F.J.; Medina-Reynés, José U.; Berúmen-Alatorre, A. C.

doi:10.1007/s00436-018-06201-w

Cited by 14 publications

(9 citation statements)

References 29 publications

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“…The FEC reduction in Phase 2 may have been a continued response carried out from Phase 1 or could be attributed to an acquired immunological development by lambs leading to a FEC of almost 0. This latter explanation has occurred in RES breeds (Zaragoza-Vera et al ., 2019). In response to the continued infection, the development of acquired immunity was seen.…”

Section: Discussionmentioning

confidence: 99%

“…In these breeds, a genetic variation of resistance to H. contortus has also been confirmed; therefore, the selection of resistant (RES) individuals represents an option for the control of parasitic infections in tropical and subtropical environments where high prevalence of AR is reported (Torres-Acosta et al ., 2012). In Mexico, the Pelibuey breed has been reported to have resistance to GIN, with significant variations within the breed (Morteo-Gómez et al ., 2004; Castillo et al ., 2011; González-Garduño et al ., 2013; Zaragoza-Vera et al ., 2019), which makes it a candidate for selection to genetically improve this trait in this breed. In order to select RES individuals, it is necessary to generate the infection and to monitor the development of the corresponding immunity.…”

Section: Introductionmentioning

confidence: 99%

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Artificial Haemonchus contortus infection as a strategy to induce protective immune response to natural infection in Pelibuey lambs

et al. 2020

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The objective of this study was to evaluate the reduction in nematode faecal egg count (FEC) in Pelibuey lambs segregated as resistant (RES), susceptible (SUS) and intermediate (INT) to gastrointestinal nematodes. Twenty-nine weaned Pelibuey lambs, aged five months old, free of nematode infection, were used. Nine lambs were RES, six were SUS and 14 were INT lambs. The study consisted of two phases: in Phase 1 the lambs were infected experimentally with Haemonchus contortus. In Phase 2, the lambs were naturally infected by grazing. Faecal and blood samples were taken every week. The packed cell volume and total protein were quantified. The FEC value (FECmax) per lamb was recorded together with a natural reduction in FEC in the two phases. The data were analysed with a model of measures repeated over time. During Phase 1, the RES lambs showed the lowest FEC (1061 ± 1053) compared to the other groups (INT: 2385 ± 1794 eggs per gram of faeces (EPG); and SUS: 3958 ± 3037 EPG). However, in Phase 2 no significant differences (p > 0.05) were observed between the groups of lambs (RES: 275 ± 498 EPG; SUS: 504 ± 1036 EPG; and INT: 603 ± 1061 EPG). At the end of Phase 1, the FEC of RES lambs was naturally reduced by 75.5% in respect to FECmax (p < 0.05), and at the end of Phase 2 the reduction in FEC was 90% in respect to FECmax (p > 0.05); the same behaviour was observed in RES and SUS lambs. It is concluded that the artificial infection in the lambs induced a more rapid immune response in RES than SUS lambs, and all lambs developed high acquired resistance by continuous infection.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Artificial Haemonchus contortus infection as a strategy to induce protective immune response to natural infection in Pelibuey lambs

et al. 2020

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“…The main hair sheep breeds raised in the tropics of Mexico are Blackbelly, Pelibuey, Dorper, and Katahdin ( Zaragoza-Vera et al ., 2019 ) due to their adaptation to environmental conditions (high temperature and humidity) and to the production systems based on grazing ( Muñoz-Osorio et al ., 2016 ). All of them has been evaluated in relation to resistance to GIN infections ( Palomo-Couoh et al ., 2016 ; 2017 ; Zaragoza-Vera et al ., 2019 ; González-Garduño et al ., 2021 ). Previous studies compared the mean FEC of GIN in ewes on different physiological stages ( González-Garduño et al ., 2014 ).…”

Section: Introductionmentioning

confidence: 99%

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

Zaragoza-Vera,

Gonzalez-Garduño,

Arjona-Jimenez

et al. 2023

Helminthologia

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Summary The objective was to identify the optimal stage of production to evaluate the resistance of Pelibuey ewes against gastrointestinal nematodes (GIN). Faecal egg count (FEC) was used to classify the ewes as resistant, sensible or intermediate against GIN. Forty-seven ewes were mating during 30 d. The gestation was verified by ultrasonography, and the breeding date was used to calculate the productive stages. Faeces were taken weekly to determine the FEC. Blood samples were taken to determine the packed cell volume (PCV), the peripheral eosinophils count (PEC), plasma protein concentration (PP), and Immunoglobulin A (IgA) against Haemonchus contortus. The body condition score (BCS) was recorded at each visit. Six moments during the study (early, mid and late gestation; early, mid and late lactation) were considered. The ewes were classified according to FEC (mean FEC ± three standard errors). The higher FEC occurred during all lactation stages than during early and mid-gestation stages (P<0.05). PCV, PP, and BCS during early gestation stage were higher than shown during the lactation stages (P<0.01). The PEC and IgA were higher during all lactation stages than early and mid-gestation stages (P<0.05). Concerning the type of birth, double births showed higher FEC than single birth (P<0.01). The highest values of accuracy (100 %) and concordance (Youden's J = 1.0) were found during early lactation. Therefore, it is concluded that the optimal stage of production to evaluate phenotypic resistance against GIN infections in Pelibuey ewes was during the early lactation.

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“…The predominant hair breeds in Mexico are Pelibuey and Blackbelly (Hinojosa-Cuéllar et al, 2012). Of these, the most frequently used in Mexico in grazing and mixed systems is Pelibuey, primarily due to its adaptation to various agro-climate environments, which currently is a factor of great consideration because of the climate changes affecting the animals (Núñez-Domínguez et al, 2016;Tsartsianidou et al, 2021), and also due to its characteristics of prolificacy and rusticity (Ramón-Ugalde and Sanginés- García, 2002) and resistance to gastrointestinal nematodes (Zaragoza-Vera et al, 2019).…”

Section: Introductionmentioning

confidence: 99%

Lactation curve, milk production of Pelibuey ewes and preweaning growth rate of the lambs

Rodríguez-Álvarez¹,

Hinojosa-Cuéllar²,

González-Garduño³

et al. 2021

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Objective: To estimate the lactation curve and milk production of Pelibuey ewes andthe relationship with preweaning growth rate of the lambs.Design/methodology/approach: Forty five Pelibuey ewes were milked during 70days in Montecillo, México, in 2018, to estimate daily and total milk production. Thelactation curve was fitted with the incomplete gamma function. In addition, the effectsof type of birth and ewe weight at milking on milk production were analyzed, andcorrelations were calculated between ewe milk production and growth rate of thelambs, per week and for the entire lactation Results: A “typical” lactation curve was found, average ewe milk production for theentire lactation, weighted for the number of lambs suckling, was 131±8 L, with444±24 g d -1 . Ewe weight at milking had an effect (p<0.01) on milk production.Positive correlations were found (p<0.05) between ewe milk production andpreweaning growth rate of the lambs.Limitations on study/implications: There is a strong dependency of the lambs forthe milk production of the Pelibuey ewe, a factor of great relevance so that lambs cangain body weight and survive during lactation.Findings/conclusions: Pelibuey ewes produce less milk than dairy ewes. Therefore,lambs should be weaned at a maximum of 10 weeks of lactation.

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Variation in phenotypic resistance to gastrointestinal nematodes in hair sheep in the humid tropics of Mexico

Cited by 14 publications

References 29 publications

Artificial Haemonchus contortus infection as a strategy to induce protective immune response to natural infection in Pelibuey lambs

Artificial Haemonchus contortus infection as a strategy to induce protective immune response to natural infection in Pelibuey lambs

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

Lactation curve, milk production of Pelibuey ewes and preweaning growth rate of the lambs

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