Gerken, Martina

[["dc.bibliographiccitation.firstpage","88"],["dc.bibliographiccitation.issue","1"],["dc.bibliographiccitation.journal","animal"],["dc.bibliographiccitation.lastpage","97"],["dc.bibliographiccitation.volume","12"],["dc.contributor.author","Brinkmann, L."],["dc.contributor.author","Riek, A."],["dc.contributor.author","Gerken, M."],["dc.date.accessioned","2020-12-10T15:22:26Z"],["dc.date.available","2020-12-10T15:22:26Z"],["dc.date.issued","2017"],["dc.identifier.doi","10.1017/S1751731117001392"],["dc.identifier.eissn","1751-732X"],["dc.identifier.issn","1751-7311"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/73397"],["dc.language.iso","en"],["dc.notes.intern","DOI Import GROB-354"],["dc.title","Long-term adaptation capacity of ponies: effect of season and feed restriction on blood and physiological parameters"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","826"],["dc.bibliographiccitation.issue","3"],["dc.bibliographiccitation.journal","Research in Veterinary Science"],["dc.bibliographiccitation.lastpage","831"],["dc.bibliographiccitation.volume","94"],["dc.contributor.author","Brinkmann, Lea"],["dc.contributor.author","Gerken, Martina"],["dc.contributor.author","Riek, Alexander"],["dc.date.accessioned","2018-11-07T09:24:28Z"],["dc.date.available","2018-11-07T09:24:28Z"],["dc.date.issued","2013"],["dc.description.abstract","Outdoor group housing is increasingly recognized as an appropriate housing system for domesticated horses. The objective of this study was therefore to investigate the effect of potential feed shortage in semi-natural horse keeping systems in winter on animal health and welfare. In 10 female Shetland ponies blood concentrations (NEFA, total protein (TP), total bilirubin (TB), beta-hydroxybutyrate (BHB) and thyroxine (T-4)), body mass and the body condition score (BCS) were monitored for 7 months including a 4 months period of feed restriction in five of the 10 ponies. Restrictively fed animals lost 18.4 +/- 2.99% of their body mass and the BCS decreased by 2.2 +/- 0.8 points (BCS scale: 0 = emaciated, 5 = obese). Feed restriction led to a continuous increase in TB (P < 0.001) and NEFA (P < 0.01) concentrations compared to control ponies. The TP and BHB values only differed at the end of the trial with lower concentrations in restricted fed mares (P < 0.05). Feed restriction had no effect on thyroxine concentrations. TB concentrations in the feed restricted group were out of the reference range during the entire feeding trial. The increased NEFA concentrations in feed restricted compared to control ponies suggest that fat was mobilized. The BCS, as well as plasma NEFA and TB concentrations were good indicators for a rapid detection of possible health problems caused by undernourishment in horses when kept under semi-natural conditions. In contrast, blood parameters of the control animals were within the reference ranges, suggesting that a year round outdoor housing with additional feed supply is an adequate housing system for a robust horse breed like the Shetland pony. (C) 2012 Elsevier Ltd. All rights reserved."],["dc.identifier.doi","10.1016/j.rvsc.2012.10.010"],["dc.identifier.isi","000318380600078"],["dc.identifier.pmid","23141417"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/29826"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","Najko"],["dc.publisher","Elsevier Sci Ltd"],["dc.relation.issn","0034-5288"],["dc.title","Effect of long-term feed restriction on the health status and welfare of a robust horse breed, the Shetland pony (Equus ferus caballus)"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dc.type.status","published"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","98"],["dc.bibliographiccitation.issue","1"],["dc.bibliographiccitation.journal","animal"],["dc.bibliographiccitation.lastpage","105"],["dc.bibliographiccitation.volume","13"],["dc.contributor.author","Runa, R. A."],["dc.contributor.author","Brinkmann, L."],["dc.contributor.author","Riek, A."],["dc.contributor.author","Hummel, J."],["dc.contributor.author","Gerken, M."],["dc.date.accessioned","2020-12-10T15:22:26Z"],["dc.date.available","2020-12-10T15:22:26Z"],["dc.date.issued","2018"],["dc.identifier.doi","10.1017/S1751731118000800"],["dc.identifier.eissn","1751-732X"],["dc.identifier.issn","1751-7311"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/73399"],["dc.language.iso","en"],["dc.notes.intern","DOI Import GROB-354"],["dc.title","Reactions to saline drinking water in Boer goats in a free-choice system"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","58"],["dc.bibliographiccitation.issue","1"],["dc.bibliographiccitation.journal","Züchtungskunde"],["dc.bibliographiccitation.lastpage","73"],["dc.bibliographiccitation.volume","85"],["dc.contributor.author","Brinkmann, Lea"],["dc.contributor.author","Gerken, Martina"],["dc.contributor.author","Riek, Alexander"],["dc.date.accessioned","2018-11-07T09:31:03Z"],["dc.date.available","2018-11-07T09:31:03Z"],["dc.date.issued","2013"],["dc.description.abstract","The aim of this study was to detect adaptation mechanisms of a domesticated horse breed to seasonal changes in climatic conditions and food availability. Therefore 10 female Shetland ponies were held under semi-extensive outdoor conditions for one year. During the second winter period the animals were allocated into one control and one treatment group, whose amount of feed was reduced from 100% to 70% of the recommended maintenance requirements. Throughout the study period, ambient temperature, body mass, body condition score, resting heart rate, locomotor activity, subcutaneous temperature (Ts), rectal temperature and total water intake were recorded individually on a biweekly or monthly basis. The Shetland ponies adapted to seasonal climatic changes and reduced feed availability by lowering their body mass, body condition score, locomotor activity; resting heart rate, Ts and total water intake. The reduced locomotor activity; resting heart rates and Ts indicate a reduced metabolic rate in winter. Additionally the diurnal rhythm of locomotor activity and Ts suggest a daily reduction in metabolism. Our Shetland ponies showed an effective adaptation to changes in environmental conditions by changes in behaviour, physiological parameters and metabolism. We therefore conclude that domestication had little effect on the Shetland ponies' adjustment mechanisms in relation to environmental conditions, as our data show clear signs of a hypometabolism."],["dc.identifier.isi","000209450400008"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/31450"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","Najko"],["dc.publisher","Eugen Ulmer Gmbh Co"],["dc.relation.issn","1867-4518"],["dc.relation.issn","0044-5401"],["dc.title","Adaptation strategies of Shetland ponies (Equus ferus caballus) to seasonal changes in climatic conditions and food availability"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dc.type.status","published"],["dspace.entity.type","Publication"]]

[["dc.contributor.author","Gerken, Martina"],["dc.date.accessioned","2021-06-28T07:53:13Z"],["dc.date.available","2021-06-28T07:53:13Z"],["dc.date.issued","2019-12-10"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/87325"],["dc.relation.conference","\"Was isst die Zukunft?\""],["dc.relation.date","2019-12-10"],["dc.relation.eventlocation","Göttingen"],["dc.title","Ökologische Auswirkungen unserer Ernährungsstile: wieviel Wasser verbraucht die Produktion von einem Steak?"],["dc.type","lecture"],["dc.type.internalPublication","yes"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","1233"],["dc.bibliographiccitation.issue","6"],["dc.bibliographiccitation.journal","Animal Cognition"],["dc.bibliographiccitation.lastpage","1243"],["dc.bibliographiccitation.volume","17"],["dc.contributor.author","Gabor, Vivian"],["dc.contributor.author","Gerken, Martina"],["dc.date.accessioned","2018-11-07T09:33:13Z"],["dc.date.available","2018-11-07T09:33:13Z"],["dc.date.issued","2014"],["dc.description.abstract","Numerical competence is one of the aspects of animal cognition with a long history of research interest, but few results are available for the horse. In the present study, we investigated the ability of three Shetland ponies to discriminate between different quantities of geometric symbols presented on a computer screen in a matching-to-sample arrangement. In Experiment 1, the ponies had to relate two similar quantities to another, paired in contrasts (1 vs. 2, 3 vs. 4 and 4 vs. 5) of the same stimulus (dot). Specific pairs of quantities (all differing by one) of up to five different geometrical symbols were displayed in Experiment 2. In each session, both quantities (more and less) were used as sample in such a way that each of the two quantities presented in one test served as positive and as negative stimulus, respectively. The three Shetland ponies were able to discriminate between the given quantities of dots by showing more than 80 % correct responses in two consecutive sessions. Only one of the ponies distinguished different shapes of geometric symbols at a level of 4 versus 5 items. The results show that all ponies were capable of visual quantity discrimination in the present matching-to-sample design, but task solving seemed more difficult when quantities were composed of heterogeneous stimuli. The present results confirm our hypothesis that the ponies based their decision on the matching concept of sameness and were not biased by a spontaneous preference for higher quantities."],["dc.identifier.doi","10.1007/s10071-014-0753-0"],["dc.identifier.isi","000343884800001"],["dc.identifier.pmid","24831887"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/31918"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","Najko"],["dc.publisher","Springer"],["dc.publisher.place","Heidelberg"],["dc.relation.issn","1435-9456"],["dc.relation.issn","1435-9448"],["dc.title","Shetland ponies (Equus caballus) show quantity discrimination in a matching-to-sample design"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dc.type.status","published"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","4320"],["dc.bibliographiccitation.issue","24"],["dc.bibliographiccitation.journal","Journal of Experimental Biology"],["dc.bibliographiccitation.lastpage","4327"],["dc.bibliographiccitation.volume","217"],["dc.contributor.author","Brinkmann, Lea"],["dc.contributor.author","Gerken, Martina"],["dc.contributor.author","Hambly, Catherine"],["dc.contributor.author","Speakman, John R."],["dc.contributor.author","Riek, Alexander"],["dc.date.accessioned","2018-11-07T09:32:00Z"],["dc.date.available","2018-11-07T09:32:00Z"],["dc.date.issued","2014"],["dc.description.abstract","Recent results suggest that wild Northern herbivores reduce their metabolism during times of low ambient temperature and food shortage in order to reduce their energetic needs. It is, however, not known whether domesticated animals are also able to reduce their energy expenditure. We exposed 10 Shetland pony mares to different environmental conditions (summer and winter) and to two food quantities (60% and 100% of maintenance energy requirement) during low winter temperatures to examine energetic and behavioural responses. In summer, ponies showed a considerably higher field metabolic rate (FMR; 63.4 +/- 15.0 MJ day(-1)) compared with food-restricted and control animals in winter (24.6 +/- 7.8 and 15.0 +/- 1.1 MJ day(-1), respectively). During summer, locomotor activity, resting heart rate and total water turnover were considerably elevated (P<0.001) compared with winter. Animals on a restricted diet (N=5) compensated for the decreased energy supply by reducing their FMR by 26% compared with control animals (N=5). Furthermore, resting heart rate, body mass and body condition score were lower (29.2 +/- 2.7 beats min(-1), 140 +/- 22 kg and 3.0 +/- 1.0 points, respectively) than in control animals (36.8 +/- 41 beats min(-1), 165 +/- 31 kg, 4.4 +/- 0.7 points; P<0.05). While the observed behaviour did not change, nocturnal hypothermia was elevated. We conclude that ponies acclimatize to different climatic conditions by changing their metabolic rate, behaviour and some physiological parameters. When exposed to energy challenges, ponies, like wild herbivores, exhibited hypometabolism and nocturnal hypothermia."],["dc.description.sponsorship","German Research Foundation (DFG) [GE 704/13-1]"],["dc.identifier.doi","10.1242/jeb.111815"],["dc.identifier.isi","000346420200012"],["dc.identifier.pmid","25359931"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/31649"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","Najko"],["dc.publisher","Company Of Biologists Ltd"],["dc.relation.issn","1477-9145"],["dc.relation.issn","0022-0949"],["dc.title","Saving energy during hard times: energetic adaptations of Shetland pony mares"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dc.type.status","published"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","199"],["dc.bibliographiccitation.issue","5"],["dc.bibliographiccitation.journal","ARCHIV FUR GEFLUGELKUNDE"],["dc.bibliographiccitation.lastpage","207"],["dc.bibliographiccitation.volume","70"],["dc.contributor.author","Gerken, Martina"],["dc.contributor.author","Afnan, R."],["dc.contributor.author","Doerl, J."],["dc.date.accessioned","2018-11-07T09:08:33Z"],["dc.date.available","2018-11-07T09:08:33Z"],["dc.date.issued","2006"],["dc.description.abstract","Based on genetically predisposed patterns, behaviour allows rapid reactions towards environmental and internal stimuli with high response plasticity. Among adaptive behavioural and physiological reactions of fowl, thermoregulation is well investigated for its importance in poultry production. In the context of thermoregulation, plumage plays an important role due to its isolating capacities. Several studies showed that a modified feather cover (e.g., through the major genes Na or F) can increase heat tolerance in chickens. The present studies were designed to investigate into behavioural thermoregulative adaptation to heat. In the first study details of the chicken plumage were studied by infrared thermography to investigate possible thermal windows suitable for heat dissipation and their relation to behaviour. In addition to the unfeathered parts such as head and legs, there exist thermal windows within the plumage cover, in particular through the nearly bare areas (apteria) under the wings and the body sides. Adaptive behavioural patterns involving preening, feather ruffling, dustbathing, and conductive heat loss via sitting are used by the bird to expose or close these thermal windows with flexibility. In experiment 2, plumage of the birds was manipulated and the behaviour under short term heat stress was studied. Twenty-four female broiler breeders were kept in floor pens from 19 wk of age at constant temperatures of 20 degrees C (control) or 28 degrees C (heat). At 39 wks of age they were subjected to short term heat challenges at 28 degrees and 32 degrees C for 10 min. The latency until panting and rectal temperatures before and after the test was measured. In half of the birds (N=24) the neck plumage was sheared and birds were re-tested at 40 Wks. Hens housed at high temperatures had reduced heat tolerance as shown by more rapid onset of panting and higher body temperatures. Number of birds panting was significantly reduced in sheared birds, underlining the adaptive role of behaviour. But in all, shearing of the neck revealed only minor beneficial effects during short term heat exposure. However, the comparison of sheared hens with Naked neck genotypes is only partly valid, because the Na gene acts as major gene affecting not only the plumage distribution but also other characteristics."],["dc.identifier.isi","000242143100003"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/26057"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","Najko"],["dc.publisher","Eugen Ulmer Gmbh Co"],["dc.publisher.place","Stuttgart"],["dc.relation.conference","Symposium on Recent Advances in the Assessment of Behavioural Demands in Poultry and Rabbit"],["dc.relation.eventlocation","Stuttgart, GERMANY"],["dc.relation.issn","0003-9098"],["dc.title","Adaptive behaviour in chickens in relation to thermoregulation"],["dc.type","conference_paper"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dc.type.status","published"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","667"],["dc.bibliographiccitation.issue","12"],["dc.bibliographiccitation.journal","JOURNAL OF EXPERIMENTAL ZOOLOGY PART A-ECOLOGICAL GENETICS AND PHYSIOLOGY"],["dc.bibliographiccitation.lastpage","675"],["dc.bibliographiccitation.volume","307A"],["dc.contributor.author","Riek, Alexander"],["dc.contributor.author","van Der Sluijs, Leendert"],["dc.contributor.author","Gerken, Martina"],["dc.date.accessioned","2018-11-07T10:48:33Z"],["dc.date.available","2018-11-07T10:48:33Z"],["dc.date.issued","2007"],["dc.description.abstract","Energy expenditure and water flux were measured in free-ranging alpacas Lama pacos, a South American camelid, on natural pastures of the Peruvian Andes (altitude: 4,400 m above sea level). Water influx rate (WIR) was estimated in 16 males (age 2 years, weight 48.5 +/- 8.6 kg) labelled with (2)H. In addition, the field metabolic rate (FMR) was measured in four of these animals labelled with both an oxygen ((18)O) and a hydrogen ((2)H) isotope. The WIR averaged 3.62 L H(2)O/day and the mean total body water 33.1 kg, equal to 68.2% of body weight (BW). The FMR of the four doubly labelled animals was 14.05 MJ/day. New allometric equations were calculated describing the relationships between WIR or FMR and BW, respectively, including published data on ruminants and the present alpaca results. The regression equation indicates that daily WIR scales to a similar metabolic size (kilograms of BW(0.94)) in alpacas than in wild or domesticated ruminants and camelids originating from and and semiarid habitats. The resulting regression equation for FMR explained over 99% of the variation and corresponded to the function FMR (kilojoules per day) = 1079 (kilograms of BW(0.668)) (n = 5, r(2) = 0.995, P < 0.001). The FMR measured in this study, the first reported for a South American camelid species, suggests that free-ranging alpacas have similar energy expenditures on a metabolic weight basis as other wild ruminants living under harsh climatic conditions.."],["dc.identifier.doi","10.1002/jez.a.419"],["dc.identifier.isi","000250885600001"],["dc.identifier.pmid","17891750"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/48223"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","Najko"],["dc.relation.issn","1932-5223"],["dc.title","Measuring the energy expenditure and water flux in free-ranging alpacas (Lama pacos) in the Peruvian Andes using the doubly labelled water technique"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.artnumber","106806"],["dc.bibliographiccitation.journal","Small Ruminant Research"],["dc.bibliographiccitation.volume","216"],["dc.contributor.author","Enke, Nick"],["dc.contributor.author","Brinkmann, Lea"],["dc.contributor.author","Runa, Rukhsana Amin"],["dc.contributor.author","Südekum, Karl-Heinz"],["dc.contributor.author","Tholen, Ernst"],["dc.contributor.author","Gerken, Martina"],["dc.date.accessioned","2022-11-01T10:16:34Z"],["dc.date.available","2022-11-01T10:16:34Z"],["dc.date.issued","2022"],["dc.description.sponsorship"," http://dx.doi.org/10.13039/501100003385 Georg-August-Universität Göttingen"],["dc.identifier.doi","10.1016/j.smallrumres.2022.106806"],["dc.identifier.pii","S092144882200195X"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/116598"],["dc.language.iso","en"],["dc.notes.intern","DOI-Import GROB-605"],["dc.relation.issn","0921-4488"],["dc.rights.uri","https://www.elsevier.com/tdm/userlicense/1.0/"],["dc.title","Drinking behaviour of llamas (Lama glama) in choice tests for fresh or saline water"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dspace.entity.type","Publication"]]