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Pesquisa : A13.869.697 [Categoria DeCS]
Referências encontradas : 533 [refinar]
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[PMID]:28215897
[Au] Autor:Drong C; Bühler S; Frahm J; Hüther L; Meyer U; von Soosten D; Gessner DK; Eder K; Sauerwein H; Dänicke S
[Ad] Endereço:Institute of Animal Nutrition, Friedrich-Loeffler-Institut (FLI), Federal Research Institute for Animal Health, Bundesallee 50, 38116 Braunschweig, Germany.
[Ti] Título:Effects of body condition, monensin, and essential oils on ruminal lipopolysaccharide concentration, inflammatory markers, and endoplasmatic reticulum stress of transition dairy cows.
[So] Source:J Dairy Sci;100(4):2751-2764, 2017 Apr.
[Is] ISSN:1525-3198
[Cp] País de publicação:United States
[La] Idioma:eng
[Ab] Resumo:Evidence exists that dairy cows experience inflammatory-like phenomena in the transition period. Rumen health and alterations in metabolic processes and gene networks in the liver as the central metabolic organ might be key factors for cows' health and productivity in early lactation. This study made use of an animal model to generate experimental groups with different manifestations of postpartal fat mobilization and ketogenesis. In total, 60 German Holstein cows were allocated 6 wk antepartum to 3 high-body condition score (BCS) groups (BCS 3.95) and 1 low-BCS group (LC; BCS 2.77). High-BCS cows were fed an antepartal forage-to-concentrate ratio of 40:60 on dry matter basis, in contrast to 80:20 in the LC group, and received a monensin controlled-release capsule (HC/MO), a blend of essential oils (HC/EO), or formed a control group (HC). We evaluated serum haptoglobin, kynurenine, tryptophan, ruminal lipopolysaccharide concentration and mRNA abundance of nuclear factor kappa B (NF-κB), nuclear factor E2-related factor 2 (Nrf2), and endoplasmatic reticulum stress-induced unfolded protein response (UPR) target genes in liver biopsy samples from d -42 until +56 relative to calving. Nearly all parameters were highly dependent on time, with greatest variation near calving. The ruminal lipopolysaccharide concentration and evaluated target genes were not generally influenced by antepartal BCS and feeding management. The kynurenine-to-tryptophan ratio was higher in LC than in HC/MO treatment on d 7. Ruminal lipopolysaccharide concentration was higher in HC/MO than in the HC group, but not increased in HC/EO group. Abundance of UPR target gene X-box binding protein 1 was higher in HC/MO than in HC/EO group on d 7. Hepatic mRNA abundance of Nrf2 target gene glutathione peroxidase 3 was higher, whereas expression of NF-κB target gene haptoglobin tended to be higher in LC than in HC/EO cows. The HC/MO cows showed the most prominent increase in the abundance of glutathione peroxidase 3 and haptoglobin after calving in comparison to antepartal values. Results indicate the presence of inflammatory-like phenomena near calving. Simultaneously, alterations in UPR and Nrf2 target genes with antioxidative properties and haptoglobin occurred, being most prominent in LC and HC/MO group.
[Mh] Termos MeSH primário: Monensin/farmacologia
Óleos Voláteis/farmacologia
[Mh] Termos MeSH secundário: Animais
Bovinos
Dieta/veterinária
Feminino
Lactação
Leite/química
Retículo
Rúmen/metabolismo
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Nm] Nome de substância:
0 (Oils, Volatile); 906O0YJ6ZP (Monensin)
[Em] Mês de entrada:1705
[Cu] Atualização por classe:170518
[Lr] Data última revisão:
170518
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:170221
[St] Status:MEDLINE


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[PMID]:28011297
[Au] Autor:Belzecki G; McEwan NR; Kowalik B; Michalowski T; Miltko R
[Ad] Endereço:The Kielanowski Institute of Animal Physiology and Nutrition, Polish Academy of Sciences, Instytucka Street 3, 05-110 Jablonna, Poland. Electronic address: g.belzecki@ifzz.pl.
[Ti] Título:Effect of Entodinium caudatum on starch intake and glycogen formation by Eudiplodinium maggii in the rumen and reticulum.
[So] Source:Eur J Protistol;57:38-49, 2017 Feb.
[Is] ISSN:1618-0429
[Cp] País de publicação:Germany
[La] Idioma:eng
[Ab] Resumo:This study aimed to quantify the engulfed starch and reserve α-glucans (glycogen) in the cells of the ciliates Eudiplodinium maggii, as well the α-glucans in defaunated and selectively faunated sheep. The content of starch inside the cell of ciliates varied from 21 to 183mg/g protozoal DM relative to the rumen fauna composition whereas, the glycogen fluctuated between 17 and 126mg/g dry matter (DM) of this ciliate species. Establishment of the population Entodinium caudatum in the rumen of sheep already faunated with E. maggii caused a drop in both types of quantified carbohydrates. The content of α-glucans in the rumen of defaunated sheep varied from 4.4 to 19.9mg/g DM and increased to 7.4-29.9 or 11.8-33.9mg/g DM of rumen contents in the presence of only E. maggii or E. maggii and E. caudatum, respectively. The lowest content of the carbohydrates was always found just before feeding and the highest at 4h thereafter. The α-glucans in the reticulum varied 7.5-40.1, 14.3-76.8 or 21.9-106.1mg/g DM of reticulum content for defaunated, monofaunated or bifaunated sheep, respectively. The results indicated that both ciliate species engulf starch granules and convert the digestion products to the glycogen, diminishing the pool of starch available for amylolytic bacteria.
[Mh] Termos MeSH primário: Cilióforos/metabolismo
Glicogênio/metabolismo
Retículo/parasitologia
Rúmen/parasitologia
Amido/metabolismo
[Mh] Termos MeSH secundário: Animais
Bactérias/metabolismo
Metabolismo dos Carboidratos
Conteúdo Gastrointestinal/parasitologia
Retículo/metabolismo
Rúmen/metabolismo
Ovinos
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Nm] Nome de substância:
9005-25-8 (Starch); 9005-79-2 (Glycogen)
[Em] Mês de entrada:1704
[Cu] Atualização por classe:170407
[Lr] Data última revisão:
170407
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:161225
[St] Status:MEDLINE


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[PMID]:27988119
[Au] Autor:Kovács L; Kézér FL; Ruff F; Szenci O
[Ad] Endereço:Magyar Tudományos Akadémia-Szent István Egyetem Large Animal Clinical Research Group, Üllo, Dóra major, H-2225, Hungary; Institute of Animal Husbandry, Faculty of Agricultural and Environmental Science, Szent István University, Páter Károly utca 1, Gödöllo, H-2100, Hungary. Electronic address: Kovac
[Ti] Título:Rumination time and reticuloruminal temperature as possible predictors of dystocia in dairy cows.
[So] Source:J Dairy Sci;100(2):1568-1579, 2017 Feb.
[Is] ISSN:1525-3198
[Cp] País de publicação:United States
[La] Idioma:eng
[Ab] Resumo:The objectives of this study were to explore changes of rumination time and reticuloruminal pH and temperature of dairy cows and heifers (means ± standard deviation; age = 5.8 ± 1.9; parity = 2.7 ± 1.4; body condition score = 3.2 ± 0.2) with eutocic (EUT, n = 10) and dystocic calving (DYS, n = 8). The recording period lasted from 3 d before calving until 7 d in milk. For the comparison of rumination time and reticuloruminal characteristics between groups, time to return to baseline (the time interval required to return to baseline from the delivery of the calf) and area under the curve (AUC; both for prepartum and postpartum periods) were calculated for each parameter. Rumination time decreased from baseline 28 h before calving both for EUT and DYS cows; after 20 h before calving, it decreased to 32.4 ± 2.3 and 13.2 ± 2.0 min/4 h between 8 and 4 h before delivery in EUT and DYS cows, respectively, and then it decreased below 10 and 5 min during the last 4 h before calving. Until 12 h after delivery, rumination time reached 42.6 ± 2.7 and 51.0 ± 3.1 min/4 h in DYS and EUT dams, respectively; however, AUC and time to return to baseline suggested lower rumination activity in DYS cows than in EUT dams for the 168-h postpartum observational period. Reticuloruminal pH decreased from baseline 56 h before calving both for EUT and DYS cows, but did not differ between groups before delivery. Reticuloruminal pH showed a decreasing tendency and clear diurnal variation after calving for both EUT and DYS cows, with slightly higher AUC values in DYS cows. In DYS cows, reticuloruminal temperature decreased from baseline 32 h before calving by 0.23 ± 0.02°C, whereas in EUT cows such a decrease was found only 20 h before delivery (0.48 ± 0.05°C). The AUC of reticuloruminal temperature calculated for the prepartum period was greater in EUT cows than in DYS cows. During the first 4 h after calving, reticuloruminal temperature decreased from 39.68 ± 0.09 to 38.96 ± 0.10°C and from 39.80 ± 0.06 to 38.81 ± 0.08°C in EUT and DYS cows, respectively, and reached baseline levels after 35.4 ± 3.4 and 37.8 ± 4.2 h after calving in EUT and DYS cows, respectively. Based on our results, continuous monitoring of changes in rumination time and reticuloruminal temperature seems to be promising in the early detection of cows with a higher risk of dystocia. Depressed rumination activity of DYS cows after calving highlights the importance of the postpartum monitoring of cows experiencing difficulties at calving. The effect of dystocia on postpartum reticuloruminal pH was not pronounced.
[Mh] Termos MeSH primário: Temperatura Corporal
Doenças dos Bovinos/diagnóstico
Distocia/veterinária
Retículo/fisiopatologia
Rúmen/fisiopatologia
[Mh] Termos MeSH secundário: 5-Hidroxitriptofano/administração & dosagem
Animais
Cálcio/sangue
Bovinos
Colostro/química
Distocia/diagnóstico
Feminino
Lactação
Leite
Parto
Gravidez
Serotonina/análise
Serotonina/sangue
Temperatura Ambiente
Fatores de Tempo
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Nm] Nome de substância:
333DO1RDJY (Serotonin); C1LJO185Q9 (5-Hydroxytryptophan); SY7Q814VUP (Calcium)
[Em] Mês de entrada:1704
[Cu] Atualização por classe:170817
[Lr] Data última revisão:
170817
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:161219
[St] Status:MEDLINE


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[PMID]:28092624
[Au] Autor:Antanaitis R; Zilaitis V; Juozaitiene V; Stoskus R; Televicius M
[Ti] Título:Changes in reticulorumen content temperature and pH according to time of day and yearly seasons.
[So] Source:Pol J Vet Sci;19(4):771-776, 2016 Dec 01.
[Is] ISSN:1505-1773
[Cp] País de publicação:Germany
[La] Idioma:eng
[Ab] Resumo:The monitoring of rumen content temperature can be useful for the evaluation of cow health condition and heat. The aim of this research was to evaluate the influence of the circadian rhythm (time of day) and season on reticulorumen acidity (pH) and temperatures (RT) in lactating dairy cows. The research was performed on ten 2nd - lactation, clinically healthy Lithuanian Black and White fresh dairy cows (up to 1 day after calving). The cows were milked twice daily at 05:00 and 17:00. The cows were kept in a loose housing system, and were fed a feed ration throughout the year at the same time, balanced according to their physiological needs. Cow feeding took place every day at 06:00 and 18:00. The pH and temperature of the contents of cow reticulorumens were measured using specific smaXtec boluses manufactured for animal care. The temperature starts rising 6 hours after the evening feeding and milking, whereas 1 hour after the morning milking, it starts decreasing. The lowest temperature observed in the springtime was 38.81±0.001, and the highest was in autumn 39.17±0.001. The pH starts decreasing 3 hours after the morning feed, whereas 4 hours after the evening feed, it starts increasing. The lowest pH was observed in the summertime - 5.99±0.001, and the highest was in autumn and springtime - 6.18±0.001. In conclusion the reticulorumen temperature in lactating cows was found to be influenced by the circadian rhythm and season. The acidity of the reticulorumen content changes similar to the temperature. The pH of the reticulorumen contents was also found to be influenced by the circadian rhythm and season.
[Mh] Termos MeSH primário: Bovinos/fisiologia
Ritmo Circadiano
Conteúdo Gastrointestinal
Retículo/fisiologia
Rúmen/fisiologia
Temperatura Ambiente
[Mh] Termos MeSH secundário: Animais
Concentração de Íons de Hidrogênio
Monitorização Fisiológica
Estações do Ano
Fatores de Tempo
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Em] Mês de entrada:1703
[Cu] Atualização por classe:170309
[Lr] Data última revisão:
170309
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:170117
[St] Status:MEDLINE


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[PMID]:27210490
[Au] Autor:Ammer S; Lambertz C; Gauly M
[Ad] Endereço:Department of Animal Sciences,Georg-August-University Göttingen,Germany.
[Ti] Título:Comparison of different measuring methods for body temperature in lactating cows under different climatic conditions.
[So] Source:J Dairy Res;83(2):165-72, 2016 May.
[Is] ISSN:1469-7629
[Cp] País de publicação:England
[La] Idioma:eng
[Ab] Resumo:The aim of the research described here was to compare different methods of body temperature (BT) measurements in dairy cows. It was hypothesised that reticular temperature (RET) values reflect the physiological status of the animals in an equivalent way to rectal (RT) and vaginal (VT) measurements. RT, VT and RET temperatures of twelve lactating Holstein-Friesian cows were measured over five consecutive days in June and October 2013. While RT and VT were manually measured three times a day, RET was automatically recorded at 10 min intervals using a bolus in the reticulum. For comparison with RT and VT, different RET values were used: single values at the respective recording times (RET-SIN), and mean (RET-MEAN) and median (RET-MED) values of 2 h prior to RT and VT measurements. Overall, body temperatures averaged 38·1 ± 0·6, 38·2 ± 0·4, 38·7 ± 0·9, 38·5 ± 0·7 and 38·7 ± 0·5 °C for RT, VT, RET-SIN, RET-MEAN and RET-MED, respectively. RT and VT were lower than all RET measurements, while RET-SIN and RET-MED were higher than RET-MEAN (P < 0·001). RET-MEAN and RET-MED values were higher in the morning, whereas RT and VT were greatest in the evening (P < 0·001). Overall, records of RT and VT were strongly correlated (r = 0·75; P < 0·001). In contrast to RET-SIN and RET-MEAN, RET-MED was higher correlated to RT and VT. In June, coefficients were higher between all methods than in October. Relation of barn T to RT and VT was stronger when compared to RET measurements. RET-SIN was higher correlated to barn T than RET-MEAN or RET-MED. Correlation between VT and barn T was strongest (r = 0·48; P < 0·001). In summary, RET-MED showed highest correlation with VT and RT. However, single RET measurements (influenced by water or feed intake) can lead to extreme variations and differences to single VT and RT values.
[Mh] Termos MeSH primário: Temperatura Corporal/fisiologia
Bovinos/fisiologia
Clima
Lactação/fisiologia
[Mh] Termos MeSH secundário: Animais
Ritmo Circadiano
Feminino
Monitorização Fisiológica/métodos
Monitorização Fisiológica/veterinária
Retículo
Estações do Ano
Termômetros/veterinária
[Pt] Tipo de publicação:COMPARATIVE STUDY; JOURNAL ARTICLE
[Em] Mês de entrada:1702
[Cu] Atualização por classe:170203
[Lr] Data última revisão:
170203
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:160524
[St] Status:MEDLINE
[do] DOI:10.1017/S0022029916000182


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[PMID]:27118203
[Au] Autor:Franzolin R; Wright AD
[Ad] Endereço:Faculdade de Zootecnia e Engenharia de Alimentos, Universidade de São Paulo, Av. Duque de Caxias Norte, 225, Pirassununga, SP, 13630900, Brazil.
[Ti] Título:Microorganisms in the rumen and reticulum of buffalo (Bubalus bubalis) fed two different feeding systems.
[So] Source:BMC Res Notes;9:243, 2016 Apr 27.
[Is] ISSN:1756-0500
[Cp] País de publicação:England
[La] Idioma:eng
[Ab] Resumo:BACKGROUND: The community of microorganisms in the rumen and reticulum is influenced by feeding as well as the species and geographical distribution of ruminant animals. Bacteria, methanogenic archaea and ciliate protozoa existing in the rumen and reticulum were evaluated by real-time polymerase chain reaction and light microscopy in buffalo in two feeding systems, grazing and feedlot. RESULTS: No significant differences were observed in the total concentrations of bacteria/mL and archaea between rumen and reticulum, and between pasture and feedlots, or interactions between variables. However, the largest density of bacteria and smallest density of archaea was observed in the rumen of grazing animals. The total ciliates protozoa community was higher in grazing buffalo than those in the feedlot on a concentrated diet. There were significant interactions between location in the gastrointestinal tract (rumen vs reticulum) and types of diets (grazing vs feedlot) in the composition of ciliates. CONCLUSIONS: Our data showed differences in the microbial community of the rumen and reticulum between grazing and feedlot feeding systems demonstrating relevant changes in the microorganism:host relationship existing on rumen-reticulum ecosystem.
[Mh] Termos MeSH primário: Ração Animal/análise
Dieta
Retículo/microbiologia
Rúmen/microbiologia
[Mh] Termos MeSH secundário: Animais
Archaea/classificação
Archaea/genética
Archaea/isolamento & purificação
Bactérias/classificação
Bactérias/genética
Bactérias/isolamento & purificação
Búfalos
Cilióforos/classificação
Cilióforos/genética
Cilióforos/isolamento & purificação
Feminino
Interações Hospedeiro-Patógeno
Masculino
Microbiota/genética
Microbiota/fisiologia
Reação em Cadeia da Polimerase
RNA Ribossômico 16S/genética
Retículo/parasitologia
Rúmen/parasitologia
[Pt] Tipo de publicação:JOURNAL ARTICLE; RESEARCH SUPPORT, NON-U.S. GOV'T
[Nm] Nome de substância:
0 (RNA, Ribosomal, 16S)
[Em] Mês de entrada:1612
[Cu] Atualização por classe:170220
[Lr] Data última revisão:
170220
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:160428
[St] Status:MEDLINE
[do] DOI:10.1186/s13104-016-2046-y


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[PMID]:26922113
[Au] Autor:Braun U
[Ad] Endereço:Department of Farm Animals, University of Zurich, Winterthurerstrasse 260, Zurich CH-8057, Switzerland. Electronic address: ubraun@vetclinics.uzh.ch.
[Ti] Título:Ultrasonographic Examination of the Reticulum, Rumen, Omasum, Abomasum, and Liver in Calves.
[So] Source:Vet Clin North Am Food Anim Pract;32(1):85-107, 2016 Mar.
[Is] ISSN:1558-4240
[Cp] País de publicação:United States
[La] Idioma:eng
[Ab] Resumo:This article describes the ultrasonographic findings of the reticulum, rumen, omasum, abomasum, and liver of calves from birth to 100 days of age. Reticular motility is used to exemplify how the forestomach function in calves progresses and gradually approaches that of adult cattle. The ultrasonographic examination of the esophageal groove reflex and the investigation of factors affecting esophageal groove closure are described. The ultrasonographic findings of the forestomachs and abomasum of calves with ruminal drinker syndrome are discussed. The article concludes with the description of the ultrasonographic examination of the liver.
[Mh] Termos MeSH primário: Bovinos/anatomia & histologia
Fígado/diagnóstico por imagem
Estômago de Ruminante/diagnóstico por imagem
[Mh] Termos MeSH secundário: Abomaso/diagnóstico por imagem
Animais
Animais Recém-Nascidos
Omaso/diagnóstico por imagem
Retículo/diagnóstico por imagem
Ultrassonografia/veterinária
[Pt] Tipo de publicação:JOURNAL ARTICLE; REVIEW
[Em] Mês de entrada:1610
[Cu] Atualização por classe:170103
[Lr] Data última revisão:
170103
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:160229
[St] Status:MEDLINE


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[PMID]:26723129
[Au] Autor:Falk M; Münger A; Dohme-Meier F
[Ad] Endereço:Agroscope, Institute for Livestock Sciences ILS, 1725 Posieux, Switzerland; Veterinary Physiology, Vetsuisse Faculty, University of Bern, CH-3001 Bern, Switzerland.
[Ti] Título:Technical note: A comparison of reticular and ruminal pH monitored continuously with 2 measurement systems at different weeks of early lactation.
[So] Source:J Dairy Sci;99(3):1951-1955, 2016 Mar.
[Is] ISSN:1525-3198
[Cp] País de publicação:United States
[La] Idioma:eng
[Ab] Resumo:Subacute ruminal acidosis is one of the most important digestive disorders in high-yielding dairy cows fed highly fermentable diets. Monitoring of forestomach pH has been suggested as a potentially valuable tool for diagnosing subacute ruminal acidosis. The objective of the present study was to compare continuously recorded measurements of an indwelling telemetric pH sensor inserted orally in the reticulum with those obtained from a measurement system placed in the ventral sac of the rumen through a cannula. The experiment was conducted with 6 ruminally cannulated Holstein cows kept in a freestall barn. Equal numbers of cows were assigned to 2 treatment groups based on their previous lactation milk yield. Cows in treatment CON- were offered a diet consisting of only fresh herbage cut once daily, and cows in treatment CON+ got fresh herbage plus a concentrate supplement according to the individual milk yield of each cow to meet their predicted nutrient requirements. The experiment lasted from 2 wk before the predicted calving date until wk 8 of lactation. During the whole experiment, a pH value was recorded every 10 min in the reticulum using a wireless telemetry bolus including a pH sensor (eBolus, eCow Ltd., Exeter, Devon, UK), which had been applied orally using a balling gun. Simultaneously, in wk 2, before the estimated calving date and in wk 2, 4, 6, and 8 of lactation, the ruminal pH was measured every 30 s for 48 h with the LRCpH measurement system (Dascor Inc., Escondido, CA) placed in the ventral sac of the rumen through the cannula. The readings of the LRCpH measurement system were summarized as an average over 10 min for statistical analysis. The recorded pH values were on average 0.24 pH units higher in the reticulum than in the rumen. The reticular pH also showed less fluctuation (overall SD 0.19 pH units) than pH profiles recorded in the rumen (overall SD 0.51 pH units). Regardless of measurement system, pH was not influenced by treatment, but varied across week of lactation and decreased with advancing lactation. The difference between ruminal and reticular pH varied across week of lactation. Due to this variation, no fixed conversion factor can be provided to make pH measurements in the reticulum comparable with those in the rumen.
[Mh] Termos MeSH primário: Bovinos/fisiologia
Indústria de Laticínios/métodos
Retículo/química
Rúmen/química
[Mh] Termos MeSH secundário: Animais
Indústria de Laticínios/instrumentação
Dieta/veterinária
Feminino
Concentração de Íons de Hidrogênio
Lactação
[Pt] Tipo de publicação:COMPARATIVE STUDY; JOURNAL ARTICLE; RESEARCH SUPPORT, NON-U.S. GOV'T
[Em] Mês de entrada:1610
[Cu] Atualização por classe:171027
[Lr] Data última revisão:
171027
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:160103
[St] Status:MEDLINE


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[PMID]:26519978
[Au] Autor:Hille KT; Hetz SK; Rosendahl J; Braun HS; Pieper R; Stumpff F
[Ad] Endereço:Institute of Veterinary Physiology, Faculty of Veterinary Medicine, Freie Universität Berlin, 14163 Berlin, Germany.
[Ti] Título:Determination of Henry's constant, the dissociation constant, and the buffer capacity of the bicarbonate system in ruminal fluid.
[So] Source:J Dairy Sci;99(1):369-85, 2016 Jan.
[Is] ISSN:1525-3198
[Cp] País de publicação:United States
[La] Idioma:eng
[Ab] Resumo:Despite the clinical importance of ruminal acidosis, ruminal buffering continues to be poorly understood. In particular, the constants for the dissociation of H2CO3 and the solubility of CO2 (Henry's constant) have never been stringently determined for ruminal fluid. The pH was measured in parallel directly in the rumen and the reticulum in vivo, and in samples obtained via aspiration from 10 fistulated cows on hay- or concentrate-based diets. The equilibrium constants of the bicarbonate system were measured at 38°C both using the Astrup technique and a newly developed method with titration at 2 levels of partial pressure of CO2 (pCO2; 4.75 and 94.98 kPa), yielding mean values of 0.234 ± 0.005 mmol ∙ L(-1) ∙ kPa(-1) and 6.11 ± 0.02 for Henry's constant and the dissociation constant, respectively (n/n = 31/10). Both reticular pH and the pH of samples measured after removal were more alkalic than those measured in vivo in the rumen (by ΔpH = 0.87 ± 0.04 and 0.26 ± 0.04). The amount of acid or base required to shift the pH of ruminal samples to 6.4 or 5.8 (base excess) differed between the 2 feeding groups. Experimental results are compared with the mathematical predictions of an open 2-buffer Henderson-Hasselbalch equilibrium model. Because pCO2 has pronounced effects on ruminal pH and can decrease rapidly in samples removed from the rumen, introduction of a generally accepted protocol for determining the acid-base status of ruminal fluid with standard levels of pCO2 and measurement of base excess in addition to pH should be considered.
[Mh] Termos MeSH primário: Bicarbonatos/química
Bovinos/fisiologia
Rúmen/metabolismo
[Mh] Termos MeSH secundário: Acidose/veterinária
Animais
Líquidos Corporais/química
Tampões (Química)
Dieta/veterinária
Feminino
Concentração de Íons de Hidrogênio
Retículo/metabolismo
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Nm] Nome de substância:
0 (Bicarbonates); 0 (Buffers)
[Em] Mês de entrada:1704
[Cu] Atualização por classe:170406
[Lr] Data última revisão:
170406
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:151102
[St] Status:MEDLINE


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[PMID]:26753366
[Au] Autor:Braun U; Brammertz C
[Ad] Endereço:Department for Farm Animals, Vetsuisse Faculty, University of Zurich
[Ti] Título:Ultrasonographic examination of the oesophageal groove reflex in young calves under various feeding conditions.
[So] Source:Schweiz Arch Tierheilkd;157(8):457-63, 2015 08.
[Is] ISSN:0036-7281
[Cp] País de publicação:Switzerland
[La] Idioma:eng
[Ab] Resumo:The oesophageal groove reflex was examined in 6 milk-fed Holstein Friesian calves once weekly during the first 17 weeks of life. Additionally, the effect of different feeding methods (bucket, different nipple positions and openings), different milk temperatures (20, 30, 39, 45°C) and milk replacer concentrations (100, 125, 150 grams/litre of water) on oesophageal groove closure was investigated. The reticulum and abomasum were examined ultrasonographically using a 5.0-MHz convex transducer before, during and after feeding, and the oesophageal groove reflex was considered to be functional when milk was seen entering the abomasum during feeding. The reflex was consistently induced throughout the study period in all calves at all examinations and under all experimental conditions. However, it should not be assumed that feeding technique can be neglected in unweaned calves because suboptimal feeding management has been linked to various digestive disorders.
[Mh] Termos MeSH primário: Animais Recém-Nascidos/fisiologia
Bovinos/fisiologia
Esôfago/diagnóstico por imagem
Esôfago/fisiologia
Reflexo/fisiologia
[Mh] Termos MeSH secundário: Abomaso/diagnóstico por imagem
Animais
Métodos de Alimentação/veterinária
Masculino
Leite/química
Retículo/diagnóstico por imagem
Rúmen/diagnóstico por imagem
Temperatura Ambiente
Ultrassonografia
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Em] Mês de entrada:1602
[Cu] Atualização por classe:170804
[Lr] Data última revisão:
170804
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:160113
[St] Status:MEDLINE



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