Design a system for measuring individual cow feed intake in commercial dairies

Monitoring individual cow feed intake is necessary for calculating the cow individual feed efficiency. The cost and maintenance time necessary for research systems make them impractical for most of the commercial producers. We developed a measurement system with producer convenience and low investment as key design criteria. The goal of this study was to design the system and validate its ability to rank cows by their feed conversion efficiency in commercial farms. The new system consisted of three principal parts: (a) a hanging weighing system, (b) a visual cow identification system and (c) an automatic cleaning system. The weighing system consisted of hanging a single load cell to provide feed mass measurements. The image-based cow identification system (replacing Radio-Frequency Identification) entailed cameras installed above the feeding area and an image processing algorithm that recognized cows by their collar numbers. The new system worked within normal farm routines: the feed supplying truck distributed the animal feed, and a tractor cleaned feed residual. To validate the accuracy and convenience of the system and to rank the cows by their efficiency, an experiment with six scales and 12 cows was conducted in a research barn, succeeded by eight-scale system in a commercial farm with 16 cows. The feed intake of each cow participating in the experiments was monitored for one month. The validation experiment showed that the system had the following specification: scales were accurate within 120 g; the visual cow identification rate was greater than 96%; feeding duration was accurate to 52 s; and routine farm practices (feed distribution, pushing, and residual removal) continued as usual. The cost for a feeding station (utilized consequently for a number of cows) was about 1 500 USD. An example of application of the system to rank cows by their efficiency under commercial conditions was shown. The system can potentially be used for ranking cows by their efficiency in commercial facilities.

Dynamic cooling strategy based on individual animal response mitigated heat stress in dairy cows

Technological progress enables individual cow's temperatures to be measured in real time, using a bolus sensor inserted into the rumen (reticulorumen). However, current cooling systems often work at a constant schedule based on the ambient temperature and not on monitoring the animal itself. This study hypothesized that tailoring the cooling management to the cow's thermal reaction can mitigate heat stress. We propose a dynamic cooling system based on in vivo temperature sensors (boluses). Thus, cooling can be activated as needed and is thus most efficacious. A total of 30 lactating cows were randomly assigned to one of two groups; the groups received two different evaporative cooling regimes. A control group received cooling sessions on a preset time-based schedule, the method commonly used in farms; and an experimental group, which received the sensor-based (SB) cooling regime. Sensor-based was changed weekly according to the cow's reaction, as reflected in the changes in body temperatures from the previous week, as measured by reticulorumen boluses. The two treatment groups of cows had similar milk yields (44.7 kg/d), but those in the experimental group had higher milk fat (3.65 vs 3.43%), higher milk protein (3.23 vs 3.13%), higher energy corrected milk (ECM, 42.84 vs 41.48 kg/d), higher fat corrected milk 4%; (42.76 vs 41.34 kg/d), and shorter heat stress duration (5.03 vs 9.46 h/day) comparing to the control. Dry matter intake was higher in the experimental group. Daily visits to the feed trough were less frequent, with each visit lasting longer. The sensor-based cooling regime may be an effective tool to detect and ease heat stress in high-producing dairy cows during transitional seasons when heat load can become severe in arid and semi-arid zones.

Use of immediate release melatonin in psychiatry: BMI impacts the daily-dose

OBJECTIVE

There is a growing interest in psychiatry regarding melatonin use both for its soporific and chronobiotic effects. This study aimed to evaluate factors impacting the daily-dose.

METHODS

In a university department of psychiatry in Paris (France), we conducted a posteriori naturalistic observational study from April 03, 2017 to January 31, 2018. We assessed links between sociodemographic and clinical characteristics and daily dose of melatonin (the daily-dose of melatonin initiation and the daily-dose at Hospital discharge). A survey of drug interactions was performed regarding metabolic inducers and inhibitors of the cytochrome P450 1A2.

RESULTS

Forty patients were included and treated with immediate-release melatonin. For patients with no history of melatonin use, the initiation dose of was 2 or 4mg, with no effects of age, weight, BMI, melatonin indication, cause of hospitalization. We found that higher discharge dose was associated with higher BMI (P=0.036) and more reevaluations of melatonin dose (P=0.00019). All patients with a moderate inducer (n=3, here lansoprazole) were significantly more associated with the discontinuation melatonin group (P=0.002).

CONCLUSION

The BMI and the number of reevaluations impact the daily dose of melatonin. Two mechanisms may explain that BMI may need higher doses: (i) melatonin diffuses into the fat mass, (ii) the variant 24E on melatonin receptor MT2, more frequent in obese patients, leads to a decrease of the receptor signal.

Gender-specific study of recurrent suicide attempts in outpatients with multiple substance use disorders

BACKGROUND

people suffering from substance use disorders (SUD) often die by suicide, so that the prevention of suicide attempts (SA) remains a top priority in this population. SA recurrence is common and is associated with suicide death, but this phenotype has been overlooked in SUD populations. Thus, we aimed at identifying the risk factors of SA recurrence in SUD, controlling for both gender and levels of exposure to addictive substances, including tobacco.

METHODS

we consecutively recruited 433 treatment-seeking outpatients with either opiate or cocaine use disorder and assessed their lifetime history of addictive and suicidal symptoms by standardized questionnaires. They were reliably classified as never, single or recurrent (≥ 2) suicide attempters, whose characteristics were identified by multinomial regression, stratified by gender; and compared to our previous work on serious SA in order to identify common or different risk profiles.

RESULTS

86/140 (61%) suicide attempters reported recurrence. The mean number of SA was 3.1. Recurrence was independently associated with psychiatric hospitalization in both genders, with nicotine dependence in men and with sedative use disorders in women.

LIMITATIONS

psychiatric diagnoses were derived from the current medication regimen.

CONCLUSION

specific and possibly avoidable/treatable risk factors for the recurrence of SA in SUD have been identified for the first time, opening new avenues for research and prevention in this high-risk population. Apart from nicotine dependence, these risk factors were very similar to those of serious SA. Although this comparison is indirect for now, it suggests a common liability towards suicidal behavior.

Serious suicide attempts in outpatients with multiple substance use disorders

BACKGROUND

Suicide is a major public health concern and suicide attempts (SA) are frequent and burdensome in people suffering from substance use disorders (SUDs). In particular, serious SAs are a preoccupying form of attempt, which remain largely overlooked in these populations, especially regarding basic risk factors such as gender, addictive comorbidity and substance use patterns. Thus, we undertook a gender-specific approach to identify the risk factors for serious SAs in outpatients with multiple SUDs.

MATERIAL AND METHODS

433 Treatment-seeking outpatients were consecutively recruited in specialized care centers and reliably classified as serious, non-serious and non-suicide attempters. We also characterized lifetime exposure to SUDs, including tobacco smoking, with standardized instruments. Current medication, including psychotropic treatments were collected, which informed psychiatric diagnoses. Multinomial regression identified independent factors specifically associated with serious SAs in each gender, separately.

RESULTS

32% Participants (N=139, 47% Women and 27% Men) reported lifetime SA. There were 82 serious attempters (59% of attempters), without significant gender difference. Sedative dependence was an independent risk factor for serious SA compared to non-SA in Women and compared to non-serious SA in Men, respectively. Other risk factors included later onset of daily tobacco smoking in Men and history of psychiatric hospitalizations in Women, whose serious SA risk was conversely lower when reporting opiate use disorder or mood disorder, probably because of treatment issues.

CONCLUSIONS

Despite several study limitations, we identified subgroups for a better-tailored prevention of serious SAs among individuals with SUDs, notably highlighting the need to better prevent and treat sedative dependence.

La méthadone à l’heure de la médecine personnalisée : prédiction de la dose efficace ? Prédiction des effets secondaires ?

Rationnel

La méthadone est prescrite comme traitement de substitution de la dépendance aux opiaces depuis les années 1960 . Néanmoins, l’expérience des cliniciens montre que la réponse thérapeutique est obtenue à des doses extrêmement variables d’un patient à l’autre et qu’il est également difficile de prédire les effets secondaires.

Méthode

En collaboration avec plusieurs centres de soins d’Île-de-France (CSAPA Espace Murger, AP–HP, hôpital Fernand-Widal, Dr Gaël Dupuy ; clinique Liberté, hôpital Paul-Guiraud, Dr Didier Touzeau ; CSAPA Moreau de Tours, centre hospitalier Sainte-Anne, Dr Xavier Laqueille ; CSAPA Monte Cristo, AP–HP, HEGP, Dr Cyrille Orizet ; CSAPA EGO, association Aurore, Dr Philippe Coeuru ; ECIMUD, AP–HP, hôpital Louis-Mourier, Dr Anne-Marie Simonpoli ; CSAPA 110 Les Halles, PSA 75, Dr Pierrre Polomeni ; Bus Méthadone Gaia, Dr Elisabeth Avril) nous avons conduit une étude recueillant des données cliniques et génétiques chez des patients héroïnomanes stabilisés sous traitement par méthadone.

Résultats

Deux cent seize patients ont été inclus entre 2008 et 2013. Nous présenterons ici des résultats concernant la prédiction des doses nécessaires à l’équilibre thérapeutique chez 80 patients ayant complété une hospitalisation de jour comprenant une exploration fonctionnelle du métabolisme hépatique . Nous présenterons également des résultats sur 161 patients ayant bénéficié d’une mesure de l’espace Qt par un cardiologue et du recueil de facteurs de risque cliniques et génétiques de Torsades de pointes, complétant des données préliminaires que nous avons publié . Ces résultats permettront de discuter les données à recueillir pour une prescription optimisée de méthadone à l’heure de la médecine personnalisée.

Associations différentielles de différents dysfonctionnements parentaux avec un début plus précoce d’usage de substances chez des patients stabilisés sous méthadone

Contexte

Dans une cohorte de patients traités par méthadone, nous avons retrouvé 35 % de tentatives de suicide (TS) sur la vie, 53 % un trouble anxieux et 61 % un trouble de l’humeur. Presque tous étaient fumeurs quotidiens de tabac, les trois quart avaient soit une dépendance au cannabis, à l’alcool ou à la cocaïne associée sur la vie. Dans ce contexte, l’identification de facteurs de variabilité interindividuelle de sévérité et de comorbidité pourrait prédire le risque d’évolution péjorative chez les sujets jeunes ou moins comorbides. Outre les traumas dans l’enfance [1], les styles parentaux [2] semblent avoir un rôle important dans ces trajectoires, tout comme un âge de début (ADD) plus précoce des consommations de substances [3].

Objectif/méthodes

Nous avons ainsi recherché chez 85 patients stabilisés sous méthadone des associations entre les scores à la Measure of Parental Style (MOPS) [4] (séparés pour chaque parent) et l’ADD de tabac, alcool, cannabis, sédatifs et cocaïne ainsi que la présence de comorbidités addictives. Les caractéristiques sociodémographiques, les conduites suicidaires et les comorbidités addictives et psychiatriques (DSM IV) étaient évaluées par entretien semi-structuré.

Résultats

Nous avons retrouvé des associations significatives (p < 0,00625) après corrections de Bonferroni pour huit tests effectués) entre indifférence paternelle et ADD inférieur du tabac, et entre abus maternel et ADD inférieur des sédatifs, mais pas entre MOPS et présence d’un TA comorbide. Après ajustement sur âge, sexe, dépression majeure et troubles anxieux en régression linéaire, l’abus maternel restait prédictif d’un ADD plus précoce des sédatifs (bêta = –0,24, p = 0,039), tout comme la dépression (bêta = –0,24, p = 0,045).

Discussion

Malgré des limites dues à notre évaluation rétrospective et à la faible taille de l’échantillon, ces résultats soulignent l’importance de l’environnement précoce dans la variabilité des trajectoires addictives. Cela suggère l’intérêt d’une prévention primaire chez des patients jeunes présentant ces dysfonctionnements parentaux.

A life-threatening dichlorophen poisoning case: clinical features and kinetics study

BACKGROUND

Human dichlorophen poisoning is rare. We aim to report a case of dichlorophen poisoning resulting in complete recovery despite life-threatening multiorgan failure and huge serum dichlorophen concentrations.

METHODS

Description of features and management in one dichlorophen-poisoned patient. After liquid-liquid extraction, dichlorophen concentrations in the urine and the serum were measured using liquid chromatography-heated electrospray ionization-tandem mass spectrometry (LC-HESI-MS/MS).

CASE REPORT

A 74-year-old female self-ingested an anti-moss dichlorophen solution (360 g/L) in a suicidal attempt. She rapidly developed caustic esophageal and gastric mucosal injuries, confusion, profuse diarrhea, and electrolyte disturbances. Initial elevation in serum aminotransferase and γ-glutamyltransferase concentrations resolved over 6 days. Serum dichlorophen concentration measured was 708.1 μg/L on admission, and its elimination was prolonged (serum apparent elimination half-life: 35.5 h), peaking in urine on day 2. Mild elevation in serum creatine phosphokinase concentration (peaking 48 h post-ingestion) and acute renal failure (requiring hemodialysis on day 8) occurred. The final outcome was favorable with supportive management.

CONCLUSION

Dichlorophen ingestion results in life-threatening multiorgan dysfunction including rapid onset of caustic digestive lesions, diarrhea, liver enzyme disturbances, as well as acute kidney injury and rhabdomyolysis. Recovery can be complete if prompt supportive management is provided.

[Stable iodine as a prophylaxis therapy following exposure to radioactive iodines: pharmacological and pharmaceutical characteristics]

More or less rapid radio-induction of thyroidian cancers is the main pathological consequence of an accidental exposure to ingested or inhaled radioactive iodines following a nuclear power plant accident. The prophylactic administration of potassium iodine in a single oral dose has to be practiced as soon as possible after the nuclear accident. The efficacy of this therapy depends on pharmacokinetics of radioidines. Iodines are rapidly and completely absorbed as iodides. The radioactive iodines, mainly iodine 131, concentrate in the thyroid gland because of a carrier-mediated transport by the Na-I symporter. Administration of stable iodine results in the symporter blockade, which limits the uptake of radioactive iodines by the thyroid and the duration of the internal irradiation. This irradiation will never exceed 3days if the therapy is started between 6h before the accidental exposure and 1h after. The pharmacist asked to dispense the tablets of stable iodine has a important place because, besides his advices on the optimal modalities of taking stable iodine and the risks of unwanted effects, he extend these advices to information on the radioactive risk and on measures of civil and sanitary protection.

HOPE, an open platform for medical data management on the grid

The paper describes a platform developed for the secure management and analysis of medical data and images in a grid environment. Designed for telemedicine and built upon the EGEE gLite middleware and particularly the metadata catalogue AMGA as well as the GridSphere web portal, the platform provides to healthcare professionals the capacity to upload and query medical information stored over distributed servers. A job submission environment is also available for data analysis. Security features include authentication and authorization by grid certificates, anonymization of medical data and image encryption. The platform is currently deployed on several sites in Europe and Asia and is being customized for applications in the field of telemedicine and medical physics.

Processing of learned information in paradoxical sleep: relevance for memory

After a short review of the post-learning paradoxical sleep (PS) deprivation effects and of the PS changes induced by learning, we present a set of electrophysiological and behavioural experiments showing that: (1) processing of relevant information is possible during PS; (2) new associations can be formed during PS; (3) previously learned information can be reprocessed during PS; and (4) the effects of information processed during PS can be transferred to the awake state and be expressed in behaviour. Altogether, these results support the idea that dynamic processes occurring during post-learning PS can contribute to the effectiveness of memory processing and facilitate memory retrieval in wakefulness.

Responses of hippocampal cells can be conditioned during paradoxical sleep

To test the hypothesis that new associations can be acquired during sleep, we developed a conditioning paradigm in which both conditioned (CS) and unconditioned (US) stimuli were non-awakening intra-cerebral stimulations. The CS was a stimulation of the Medical Geniculate body and the US a stimulation of the Central Grey. An increase in hippocampal multiunit activity to CS was taken as the conditioned response. CS-US pairings were presented across 14 sessions, with 15 trials per session and a 24-h inter-session interval. Three groups were studied: in a group the CS-US pairings were given during the awake state (group W), and in two groups pairings were presented during sleep, either slow-wave sleep (group SWS) or paradoxical sleep (group PS). In the last group, to test the possibility of transfer to the awake state of the hippocampal response acquired in PS, the CS alone were presented interspersed with periods of wakefulness. Results showed that, before pairing, CS presentation induced no change in hippocampal multiunit activity in the three groups. After pairing, no hippocampal response to CS presentation occurred in SWS. In contrast, in the W group and in the PS group, a marked increase in hippocampal activity appeared to CS. The hippocampal response in the PS group developed progressively across sessions; it occurred only two sessions later than in the W group. Moreover, when the CS-evoked response reached the asymptotic level in PS, the presentation of CS alone in awake animals elicited the hippocampal response. These results suggest that a cellular conditioning can be established during PS and that the cellular conditioned response developed in PS can be transferred to the awake state.

Improvement of learning by mesencephalic reticular stimulation during postlearning paradoxical sleep

Evidences have been given which suggest that a newly formed memory trace is processed during paradoxical sleep (PS) following learning. The present experiments were aimed at testing the hypothesis that during postlearning PS the new memory trace is in a similar state as immediately after acquisition. For this purpose, a mild electrical stimulation of the mesencephalic reticular formation (MRF)--known to enhance retention performance when delivered just after learning--was administered during postlearning PS phases. Wistar rats were trained to run in a six-unit spatial discrimination maze for food reward. After each daily trial, extradural cortical electrodes (ECoG) activity was monitored polygraphically for 4 h. Half of the animals received nonawakening MRF stimulations during the first six phases of PS. Control rats received no stimulation. The learning results showed a marked improvement in performance, in terms of error number reduction, in the stimulated group. Results of a second experiment confirmed the facilitative effect of MRF stimulations given during postlearning PS. Moreover, they emphasized the specific role of PS, by showing that the same stimulations were ineffective when delivered, at the same time intervals after training, during six periods of waking or six periods of slow-wave sleep. These results lend support to the idea of a reactivation of the new memory trace during PS. They suggest that dynamic processes, similar to those immediately following acquisition or exposure to a reactivating treatment (i.e., a reminder), take place during postlearning PS.

Linear relation between the magnitude of long-term potentiation in the dentate gyrus and associative learning in the rat. A demonstration using commissural inhibition and local infusion of an N-methyl-D-aspartate receptor antagonist

Field potentials were recorded in the dentate gyrus of freely-moving rats in a classical conditioning paradigm in which high-frequency stimulation of the perforant path served as a conditioned stimulus. Paired or unpaired perforant path stimulus-footshock presentations were given to animals engaged in a previously acquired food-motivated lever-pressing task. Conditioned suppression of lever-pressing was the behavioural measure of conditioning. Perforant path stimulus trains at an intensity above spike threshold induced long-term potentiation of synaptic transmission in the dentate gyrus. In this condition, animals learned the perforant path stimulus-shock association. Three strategies were employed to block the induction or reduce the magnitude of long-term potentiation induced by the conditioned stimulus: (1) reduction of the intensity of the stimulus below the spike threshold resulted in no long-term potentiation and a failure by the animals to learn the perforant path stimulus-shock association; (2) inhibitory modulation of long-term potentiation by high-frequency activation of commissural input to the dentate gyrus resulted in learning deficits; (3) chronic infusion of DL-2-amino-5-phosphonovalerate, a selective antagonist of the N-methyl-D-aspartate subtype of glutamate receptor, blocked the induction of long-term potentiation and prevented associative learning. A highly significant linear relation emerged from a correlational analysis between the magnitude of the change in synaptic efficacy at the activated synapses and the amount the animals learned about the perforant path stimulus-shock association. The results presented in this paper are consistent with the hypothesis that associative learning depends on the development of lasting changes in synaptic function. We propose that the activation of N-methyl-D-aspartate receptors in the dentate gyrus is involved in this process and that the more change in synaptic efficacy is produced in the activated network, the more the animals learn.

Enhancement of long-term potentiation in the rat dentate gyrus by post-trial stimulation of the reticular formation

The possibility that post-trial stimulation of the mesencephalic reticular formation (m.r.f.) may modulate long-term potentiation (l.t.p.) at the perforant path to dentate granule cell synapses was studied in freely moving rats. Extracellular potentials evoked in the dentate gyrus by test pulses to the perforant path were recorded before and at various delays after a series of high-frequency stimulus trains to the perforant path (ten trains of eight pulses at 400 Hz, delivered at 5 min intervals). We have compared the magnitude and duration of l.t.p. of the population spike in this control condition with that observed when a low-intensity m.r.f. stimulation was delivered 10 s after each train to the perforant path. Post-event m.r.f. stimulation enhanced the amount of l.t.p. induced by the series of high-frequency stimulus trains and prolonged its duration for several days. The size of the population spike was unaffected by repeated m.r.f. stimulation in the absence of perforant path high-frequency stimulation, or when this failed to induce significant l.t.p. The temporal gradient of efficacy of m.r.f. stimulation was investigated. M.r.f. stimulation delivered 10 s after a single high-frequency stimulation of perforant path fibres resulted in an enhanced l.t.p. of both the population excitatory post-synaptic potential (e.p.s.p.) and population spike. L.t.p. was unaffected by m.r.f. stimulation given either before, or 120 s after perforant path high-frequency stimulation. These results show that low-intensity m.r.f. stimulation enhances lasting changes in synaptic function in the dentate gyrus when delivered during a critical period following high-frequency activation of perforant path fibres. These results are discussed in the light of our previous findings on the effects of post-event m.r.f. stimulation on memory and on the development of associative changes in hippocampal multiunit activity during conditioning. It is hypothesized that l.t.p.-like mechanisms may be involved in the stabilization of neural networks by experience and that this process might be reinforced by diffuse m.r.f. activation.

Facilitation of generalization performances in spatial learning problems by posttrial stimulation of the mesencephalic reticular formation

The effects of low posttrial stimulation of the mesenphalic reticular formation (MRF) on spatial learning problems were studied in two consecutive stages. First, the performances of stimulated (S) and no-stimulated (NS) subjects were assessed in a reconvergent three-arm maze. Secondly, the same animals were tested in a generalization paradigm, since they had to solve a similar task in a radial four-arm maze, each group being divided into newly stimulated (S-S, NS-S) or no-stimulated (S-NS, NS-NS) subjects. In the first experiment, no differences were found between the acquisition processes of groups S and NS. Conversely, in the second experiment, previously stimulated animals (S-S and S-NS) showed better generalization of the experimental rule. The results are discussed in terms of preservation of the neural activity after the early MRF stimulation. From a functional point of view, our data indicate that an enhancement of the neural activity during acquisition facilitates not only a high accessibility of memories concerning the experimental rule in a subsequent similar situation but also the capability to apply a previously elaborated response system in a more complex situation.

Post-trial reticular facilitation of associative changes in multiunit activity; comparison between dentate gyrus and entorhinal cortex

Multiunit activity recorded in both the dentate gyrus and the entorhinal cortex during classical conditioning was studied in freely moving rats receiving a mild post-trial stimulation of the mesencephalic reticular formation. Dentate multiunit activity progressively increased in response to an auditory signal (conditioned stimulus) after pairing the signal with a footshock (unconditioned stimulus). No such increase was seen in the entorhinal cortex of the same animals during conditioning. Post-trial reticular stimulation facilitated the development of associative changes in dentate multiunit activity, while having no effect in the entorhinal cortex. The results were interpreted as indicating a possible specificity of action of post-trial reticular stimulation on learning-induced plasticity and are discussed in relation to the concept of neural perseverance in memory consolidation.

Conditioning of hippocampal cells: its acceleration and long-term facilitation by post-trial reticular stimulation

Neuronal activity, recorded in the dorsal hippocampus (CA3) during classical conditioning, was studied in rats receiving mild post-trial stimulation of the mesencephalic reticular formation. Hippocampal multi-unit activity increased in response to an auditory signal (conditioned stimulus) after pairing of the signal with a footshock (unconditioned stimulus), while the auditory signal alone, presented before conditioning, did not change the rate of hippocampal cell discharges. Trial-by-trial analysis of hippocampal multi-unit responses to the conditioned stimulus, both during acquisition and during a test of long-term retention, indicated that post-trial mesencephalic reticular stimulation hastened the onset of cellular conditioning and facilitated conversion to long-term storage. A study of evoked potentials recorded in the hippocampal formation to stimulation of the perforant path in awake rats, suggested that these effects could be mediated through a modulation of synaptic efficiency within hippocampal neuronal networks. These data are discussed in relation to the concept of neural perseveration in memory consolidation.

Bulbar Control of Cortical Arousal

In the cat, the cortical arousal induced by reticular or nociceptive stimulation is more intense and more long-lasting after elimination of the caudal and medial part of the medulla than in preparations with intact brain. This difference is explained by the intervention of a phasic-ascending inhibitory bulbar control secondarily triggered by the mesencephalic activating system.