Gauly, Matthias

[["dc.bibliographiccitation.firstpage","1526"],["dc.bibliographiccitation.issue","9"],["dc.bibliographiccitation.journal","animal"],["dc.bibliographiccitation.lastpage","1533"],["dc.bibliographiccitation.volume","8"],["dc.contributor.author","Wegner, K."],["dc.contributor.author","Lambertz, C."],["dc.contributor.author","Das, Guerbuez"],["dc.contributor.author","Reiner, Johannes R."],["dc.contributor.author","Gauly, Matthias"],["dc.date.accessioned","2018-11-07T09:35:48Z"],["dc.date.available","2018-11-07T09:35:48Z"],["dc.date.issued","2014"],["dc.description.abstract","Although the climate in Germany is moderate, heat stress conditions may occur during summer months. However, it is unknown to what extent sow fertility and piglet survival are affected under moderate climatic conditions in indoor systems. Therefore, this study estimated effects of temperature and temperature-humidity index (THI) on sow fertility and piglet survival under practical husbandry conditions. Temperature and relative humidity were recorded in six piglet-producing farms in Lower Saxony, Germany, from July 2011 to August 2012. Based on that, the THI was calculated. In one farrowing, waiting and servicing unit of each farm two data loggers were installed. Reproductive parameters of 8279 successful inseminations and 10 369 litters including total number of piglets born, liveborn, stillborn and weaned piglets as well as pre-weaning mortality were evaluated. The effects of temperature and THI on reproductive parameters were estimated for varying periods after breeding and before and after farrowing, respectively. Average daily temperature across all units ranged from 15.6 degrees C to 29.0 degrees C, and average THI from 62.4 to 75.1. Season and parity significantly affected total number of piglets born, number of liveborn, stillborn and weaned piglets (P < 0.001). The number of piglets born increased with rising temperature and THI in the 1st week post breeding. Higher temperatures and THI values before farrowing resulted in a reduced number of liveborn piglets. Elevated temperature and THI values after farrowing were associated with a greater number of weaned piglets. The pre-weaning mortality significantly decreased with increasing temperature and THI values after farrowing (P < 0.05). In conclusion, temperature and THI affected the reproductive performance of the sows and the survival of the piglets in different ways. While increased climatic values at the time of breeding positively affected the total number of piglets born, increased values at the time of farrowing had negative impacts on the reproductive performance of the sows. Piglets benefited from higher temperature and THI values after farrowing."],["dc.description.sponsorship","Ministry for Education and Research [033L029B]"],["dc.identifier.doi","10.1017/S1751731114001219"],["dc.identifier.isi","000342219000016"],["dc.identifier.pmid","24846319"],["dc.identifier.purl","https://resolver.sub.uni-goettingen.de/purl?gs-1/12940"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/32471"],["dc.notes.intern","Merged from goescholar"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","Najko"],["dc.publisher","Cambridge Univ Press"],["dc.relation.issn","1751-732X"],["dc.relation.issn","1751-7311"],["dc.rights","Goescholar"],["dc.rights.uri","https://goescholar.uni-goettingen.de/licenses"],["dc.title","Climatic effects on sow fertility and piglet survival under influence of a moderate climate"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dc.type.status","published"],["dc.type.version","published_version"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","110"],["dc.bibliographiccitation.issue","1"],["dc.bibliographiccitation.journal","Parasitology"],["dc.bibliographiccitation.lastpage","119"],["dc.bibliographiccitation.volume","139"],["dc.contributor.author","Das, Guerbuez"],["dc.contributor.author","Abel, Hansjoerg"],["dc.contributor.author","Humburg, Julia"],["dc.contributor.author","Schwarz, A."],["dc.contributor.author","Rautenschlein, Silke"],["dc.contributor.author","Breves, Gerhard"],["dc.contributor.author","Gauly, Matthias"],["dc.date.accessioned","2018-11-07T09:15:47Z"],["dc.date.available","2018-11-07T09:15:47Z"],["dc.date.issued","2012"],["dc.description.abstract","This study examined whether Ascaridia galli infection can be controlled by dietary non-starch polysaccharides (NSP) in chickens. One-day-old chicks were fed either a basal diet (CON) or CON plus insoluble NSP (I-NSP), or CON plus soluble NSP (S-NSP) for 11 weeks. Three weeks later, birds from half of each feeding group were inoculated with 250 embryonated eggs of A. galli, and slaughtered 8 weeks post-infection to determine worm counts. Both NSP diets, particularly S-NSP, increased prevalence of infection (P<0.05) and worm burden (roughly +50%) of the birds (P<0.001). A. galli infection caused a less efficient (P = 0.013) feed utilization for body weight gain (BWG) resulting in lower body weights (P<0.001) irrespective of type of diet consumed. NSP-fed birds, particularly those on I-NSP, consumed more (+ 8%) feed per unit BWG and showed retarded (P<0.001) BW development compared to CON-fed birds. Intracaecal pH was lowered by S-NSP (P<0.05). Both NSP diets increased the volatile fatty acids pool size in caeca (P<0.001) with S-NSP exerting a greater effect (+ 46%) than I-NSF (+ 24%). It is concluded that both NSPs supplemented diets alter gastrointestinal environment in favour of the nematode establishment, and thus have no potential for controlling A. galli infection in chickens."],["dc.identifier.doi","10.1017/S0031182011001636"],["dc.identifier.isi","000299580900012"],["dc.identifier.pmid","21939584"],["dc.identifier.purl","https://resolver.sub.uni-goettingen.de/purl?gs-1/8762"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/27779"],["dc.notes.intern","Merged from goescholar"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","Najko"],["dc.publisher","Cambridge Univ Press"],["dc.relation.issn","0031-1820"],["dc.rights","Goescholar"],["dc.rights.uri","https://goescholar.uni-goettingen.de/licenses"],["dc.title","The effects of dietary non-starch polysaccharides on Ascaridia galli infection in grower layers"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dc.type.status","published"],["dc.type.version","published_version"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","357"],["dc.bibliographiccitation.issue","1"],["dc.bibliographiccitation.journal","Parasitology Research"],["dc.bibliographiccitation.lastpage","364"],["dc.bibliographiccitation.volume","112"],["dc.contributor.author","Tiersch, K. M."],["dc.contributor.author","Das, Guerbuez"],["dc.contributor.author","v. Samson-Himmelstjerna, G."],["dc.contributor.author","Gauly, Matthias"],["dc.date.accessioned","2018-11-07T09:30:17Z"],["dc.date.available","2018-11-07T09:30:17Z"],["dc.date.issued","2013"],["dc.description.abstract","This study investigated whether infectivity of Capillaria obsignata eggs depends on media culture used for embryonation. Intact female worms were kept in one of following four media: 0.5 % formalin, 2 % formalin, 0.1 % potassium dichromate and 0.1 N sulfuric acid. Embryonation rates of the eggs were quantified either daily in intact females for 16 days, or weekly in disrupted females. Infectivity of the embryonated eggs was tested through an experimental infection of chickens with a single dose of 250 eggs/bird. The vast majority of the eggs (>82 %) in the first two thirds of the uteri was able to complete embryonation, irrespective of the culture media used for incubation. However, only 32.6 % of total eggs could be harvested after disruption of the intact females. Embryonation rates of the eggs from disrupted worms were different among four culture media, with 0.1 N sulfuric acid resulting in the highest embryonation rate (44.2 %). All the experimentally infected birds harboured mature worms, with varying establishment rates depending on the culture media (P<0.001). Incubation of the eggs in potassium dichromate 0.1 % resulted in a lower (P<0.001) establishment rate (10.2 %) when compared with formalin (70.5 and 47.9 % for concentrations at 0.5 and 2 %, respectively) or with 0.1 N sulfuric acid (57.5 %). It can be concluded that most of the eggs in first two thirds of the uteri in the intact females have the potential to complete embryonation without being influenced by the culture media. However, disruption of the intact females results in lower number of harvestable embryonated eggs, with a considerable variation due to culture media used. With the exception of 0.1 % potassium dichromate, any of the three media, particularly 0.1 N sulfuric acid, can be suggested for embryonation of C. obsignata eggs."],["dc.identifier.doi","10.1007/s00436-012-3143-z"],["dc.identifier.isi","000314064200041"],["dc.identifier.pmid","23052774"],["dc.identifier.purl","https://resolver.sub.uni-goettingen.de/purl?gs-1/8814"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/31272"],["dc.notes.intern","Merged from goescholar"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","Najko"],["dc.publisher","Springer"],["dc.relation.issn","0932-0113"],["dc.rights","Goescholar"],["dc.rights.uri","https://goescholar.uni-goettingen.de/licenses"],["dc.title","The role of culture media on embryonation and subsequent infectivity of Capillaria obsignata eggs"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dc.type.status","published"],["dc.type.version","published_version"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.artnumber","334"],["dc.bibliographiccitation.journal","Parasites & Vectors"],["dc.bibliographiccitation.volume","7"],["dc.contributor.author","Das, Guerbuez"],["dc.contributor.author","Gauly, Matthias"],["dc.date.accessioned","2018-11-07T09:37:36Z"],["dc.date.available","2018-11-07T09:37:36Z"],["dc.date.issued","2014"],["dc.description.abstract","Background: Density related effects, both inverse density- and density-dependent, contribute to regulating population dynamics of parasites. We investigated whether density related effects are directly controlling lifetime fecundity of Heterakis gallinarum. Methods: Daily total numbers of H. gallinarum eggs in faeces samples (N = 1365) from chickens (N = 39) were quantified starting from 3 weeks (wk) post-infection (p.i.). The birds were necropsied 8 wk p.i., and intensity and demographic characteristics of infrapopulations were determined. Density related effects on cumulative egg excretion (CEE), lifetime fecundity and worm length were investigated with a segmented regression analysis. Results: For CEE, lifetime fecundity and female worm length, we determined highly similar parasite intensity thresholds (52-54 worms), which separated infrapopulations for influences of inverse density- and density dependence. CEE increased as parasite intensity increased up to an intensity of 52 worms. After this threshold, the relationship followed more of a horizontal line indicating impaired worm fecundity at higher parasite intensities. Lifetime fecundity was enhanced linearly in infrapopulations with up to 54 worms, but thereafter decreased gradually with increasing infrapopulation size. Female worm length increased linearly with elevating parasite intensity up to a threshold of 54 worms and thereafter declined with a rate of -0.014 mm for each additional worm. Lifetime fecundity and female worm length did not significantly differ between infrapopulations below and above the thresholds (P > 0.05). Lifetime fecundity was positively associated with the percentage of male worms (r = 0.44; P < 0.001), but negatively with absolute deviation from the theoretically expected sex ratio in the infrapopulations (r = -0.56; P = 0.005). These relationships were stronger in infrapopulations below the threshold (r = 0.51 and -0.61, respectively), and were not significantly different from zero in the infrapopulations above the threshold (P > 0.05). Conclusions: Egg production of H. gallinarum is regulated by the effects of both inverse density- and density-dependent mechanisms, which result in similar average lifetime fecundity below or above intensity thresholds. In infrapopulations below the intensity thresholds, inverse density dependence effects on lifetime fecundity appear to result partly from sex ratio fluctuations and impaired mating success of the nematode."],["dc.identifier.doi","10.1186/1756-3305-7-334"],["dc.identifier.isi","000339408100001"],["dc.identifier.pmid","25034471"],["dc.identifier.purl","https://resolver.sub.uni-goettingen.de/purl?gs-1/10497"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/32876"],["dc.notes.intern","Merged from goescholar"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","Najko"],["dc.publisher","Biomed Central Ltd"],["dc.relation.issn","1756-3305"],["dc.rights","CC BY 4.0"],["dc.rights.uri","https://creativecommons.org/licenses/by/4.0"],["dc.title","Density related effects on lifetime fecundity of Heterakis gallinarum in chickens"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dc.type.status","published"],["dc.type.version","published_version"],["dspace.entity.type","Publication"]]