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Dalila Aldana-aranda - One of the best experts on this subject based on the ideXlab platform.
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Effect of photoperiod and Feeding Schedule on growth and survival of larvae of the fighting conch Strombus pugilis Linné, 1758 (Mollusca, Gastropoda)
Aquaculture, 2013Co-Authors: Nancy Brito-manzano, Dalila Aldana-arandaAbstract:Abstract The combined influence of Feeding Schedule and photoperiod on fighting conch, Strombus pugilis (Linne, 1758) larvae growth and survival was studied using two Feeding Schedules (12 h and 24 h with food) and three photoperiods (0 h light, 12 h light and 24 h light). This effect of Feeding and photoperiods was tested in three months (May, June and July). Shell length was measured every two days to establish growth for each treatment. For the three experiments, continuous darkness and Feeding were advantageous for larvae growth with the higher growth rate (42 μm d − 1 ) while continuous light and Feeding had a negative effect on growth (29 μm d − 1 ) and survival (13%). However the highest survival (44%) was obtained in 12 h light and 24 h Feeding.
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Effect of photoperiod and Feeding Schedule on growth and survival of larvae of the fighting conch Strombus pugilis Linné, 1758 (Mollusca, Gastropoda)
Aquaculture, 2013Co-Authors: Nancy Brito-manzano, Dalila Aldana-arandaAbstract:AbstractThe combined influence of Feeding Schedule and photoperiod on fighting conch, Strombus pugilis (Linné, 1758) larvae growth and survival was studied using two Feeding Schedules (12h and 24h with food) and three photoperiods (0h light, 12h light and 24h light). This effect of Feeding and photoperiods was tested in three months (May, June and July). Shell length was measured every two days to establish growth for each treatment. For the three experiments, continuous darkness and Feeding were advantageous for larvae growth with the higher growth rate (42μm d−1) while continuous light and Feeding had a negative effect on growth (29μm d−1) and survival (13%). However the highest survival (44%) was obtained in 12h light and 24h Feeding
Nancy Brito-manzano - One of the best experts on this subject based on the ideXlab platform.
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Effect of photoperiod and Feeding Schedule on growth and survival of larvae of the fighting conch Strombus pugilis Linné, 1758 (Mollusca, Gastropoda)
Aquaculture, 2013Co-Authors: Nancy Brito-manzano, Dalila Aldana-arandaAbstract:Abstract The combined influence of Feeding Schedule and photoperiod on fighting conch, Strombus pugilis (Linne, 1758) larvae growth and survival was studied using two Feeding Schedules (12 h and 24 h with food) and three photoperiods (0 h light, 12 h light and 24 h light). This effect of Feeding and photoperiods was tested in three months (May, June and July). Shell length was measured every two days to establish growth for each treatment. For the three experiments, continuous darkness and Feeding were advantageous for larvae growth with the higher growth rate (42 μm d − 1 ) while continuous light and Feeding had a negative effect on growth (29 μm d − 1 ) and survival (13%). However the highest survival (44%) was obtained in 12 h light and 24 h Feeding.
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Effect of photoperiod and Feeding Schedule on growth and survival of larvae of the fighting conch Strombus pugilis Linné, 1758 (Mollusca, Gastropoda)
Aquaculture, 2013Co-Authors: Nancy Brito-manzano, Dalila Aldana-arandaAbstract:AbstractThe combined influence of Feeding Schedule and photoperiod on fighting conch, Strombus pugilis (Linné, 1758) larvae growth and survival was studied using two Feeding Schedules (12h and 24h with food) and three photoperiods (0h light, 12h light and 24h light). This effect of Feeding and photoperiods was tested in three months (May, June and July). Shell length was measured every two days to establish growth for each treatment. For the three experiments, continuous darkness and Feeding were advantageous for larvae growth with the higher growth rate (42μm d−1) while continuous light and Feeding had a negative effect on growth (29μm d−1) and survival (13%). However the highest survival (44%) was obtained in 12h light and 24h Feeding
Andries Kalsbeek - One of the best experts on this subject based on the ideXlab platform.
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An Ultradian Feeding Schedule in Rats Affects Metabolic Gene Expression in Liver, Brown Adipose Tissue and Skeletal Muscle with Only Mild Effects on Circadian Clocks
International Journal of Molecular Sciences, 2018Co-Authors: Paul De Goede, Satish Sen, Ewout Foppen, Vincent-joseph Poirel, Etienne Challet, Andries KalsbeekAbstract:Restricted Feeding is well known to affect expression profiles of both clock and metabolic genes. However, it is unknown whether these changes in metabolic gene expression result from changes in the molecular clock or in Feeding behavior. Here we eliminated the daily rhythm in Feeding behavior by providing 6 meals evenly distributed over the light/dark-cycle. Animals on this 6-meals-a-day Feeding Schedule retained the normal day/night difference in physiological parameters including body temperature and locomotor activity. The daily rhythm in respiratory exchange ratio (RER), however, was significantly phase-shifted through increased utilization of carbohydrates during the light phase and increased lipid oxidation during the dark phase. This 6-meals-a-day Feeding Schedule did not have a major impact on the clock gene expression rhythms in the master clock, but did have mild effects on peripheral clocks. In contrast, genes involved in glucose and lipid metabolism showed differential expression. In conclusion, eliminating the daily rhythm in Feeding behavior in rats does not affect the master clock and only mildly affects peripheral clocks, but disturbs metabolic rhythms in liver, skeletal muscle and brown adipose tissue in a tissue-dependent manner. Thereby, a clear daily rhythm in Feeding behavior strongly regulates timing of peripheral metabolism, separately from circadian clocks.
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the suprachiasmatic nucleus controls the daily variation of plasma glucose via the autonomic output to the liver are the clock genes involved
European Journal of Neuroscience, 2005Co-Authors: Cathy Cailotto, Andries Kalsbeek, Joke Wortel, Susanne E La Fleur, Caroline Van Heijningen, Matthijs G P Feenstra, Paul Pevet, R M BuijsAbstract:In order to drive tissue-specific rhythmic outputs, the master clock, located in the suprachiasmatic nucleus (SCN), is thought to reset peripheral oscillators via either chemical and hormonal cues or neural connections. Recently, the daily rhythm of plasma glucose (characterized by a peak before the onset of the activity period) has been shown to be directly driven by the SCN, independently of the SCN control of rhythmic Feeding behaviour. Indeed, the daily variation in glucose was not impaired unless the Scheduled Feeding regimen (six-meal Schedule) was associated with an SCN lesion. Here we show that the rhythmicity of both clock-gene mRNA expression in the liver and plasma glucose is not abolished under such a regular Feeding Schedule. Because the onset of the activity period and hyperglycemia are correlated with an increased sympathetic tonus, we investigated whether this autonomic branch is involved in the SCN control of plasma glucose rhythm and liver rhythmicity. Interestingly, hepatic sympathectomy combined with a six-meal Feeding Schedule resulted in a disruption of the plasma glucose rhythmicity without affecting the daily variation in clock-gene mRNA expression in the liver. Taking all these data together, we conclude that (i) the SCN needs the sympathetic pathway to the liver to generate the 24-h rhythm in plasma glucose concentrations, (ii) rhythmic clock-gene expression in the liver is not dependent on the sympathetic liver innervation and (iii) clock-gene rhythmicity in liver cells is not sufficient for sustaining a circadian rhythm in plasma glucose concentrations.
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the suprachiasmatic nucleus generates the diurnal changes in plasma leptin levels
Endocrinology, 2001Co-Authors: Andries Kalsbeek, Eric Fliers, Johannes A Romijn, S E La Fleur, Joke Wortel, O Bakker, E Endert, R M BuijsAbstract:At present it is not clear which factors are responsible for the diurnal pattern of plasma leptin levels, although the timing of food intake and circulating hormones such as glucocorticoids and insulin have both been proposed as independent determinants. In this study we show that ablation of the biological clock by thermal lesions of the hypothalamic suprachiasmatic nucleus (SCN) completely eliminates the diurnal pattern of plasma leptin levels. By contrast, removal of the diurnal corticosterone signal by adrenalectomy and corticosterone replacement did not affect diurnal plasma leptin levels. More importantly, removal of the nocturnal Feeding signal by submitting the animals to a regular Feeding Schedule of six meals per day did not abolish the diurnal plasma leptin levels. However, both SCN lesions and the regular Feeding Schedule did cause an increase in the 24-h mean plasma leptin levels. As neither rhythmic Feeding, insulin, or corticosterone signals can completely explain the diurnal plasma leptin ...
R M Buijs - One of the best experts on this subject based on the ideXlab platform.
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the suprachiasmatic nucleus controls the daily variation of plasma glucose via the autonomic output to the liver are the clock genes involved
European Journal of Neuroscience, 2005Co-Authors: Cathy Cailotto, Andries Kalsbeek, Joke Wortel, Susanne E La Fleur, Caroline Van Heijningen, Matthijs G P Feenstra, Paul Pevet, R M BuijsAbstract:In order to drive tissue-specific rhythmic outputs, the master clock, located in the suprachiasmatic nucleus (SCN), is thought to reset peripheral oscillators via either chemical and hormonal cues or neural connections. Recently, the daily rhythm of plasma glucose (characterized by a peak before the onset of the activity period) has been shown to be directly driven by the SCN, independently of the SCN control of rhythmic Feeding behaviour. Indeed, the daily variation in glucose was not impaired unless the Scheduled Feeding regimen (six-meal Schedule) was associated with an SCN lesion. Here we show that the rhythmicity of both clock-gene mRNA expression in the liver and plasma glucose is not abolished under such a regular Feeding Schedule. Because the onset of the activity period and hyperglycemia are correlated with an increased sympathetic tonus, we investigated whether this autonomic branch is involved in the SCN control of plasma glucose rhythm and liver rhythmicity. Interestingly, hepatic sympathectomy combined with a six-meal Feeding Schedule resulted in a disruption of the plasma glucose rhythmicity without affecting the daily variation in clock-gene mRNA expression in the liver. Taking all these data together, we conclude that (i) the SCN needs the sympathetic pathway to the liver to generate the 24-h rhythm in plasma glucose concentrations, (ii) rhythmic clock-gene expression in the liver is not dependent on the sympathetic liver innervation and (iii) clock-gene rhythmicity in liver cells is not sufficient for sustaining a circadian rhythm in plasma glucose concentrations.
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the suprachiasmatic nucleus generates the diurnal changes in plasma leptin levels
Endocrinology, 2001Co-Authors: Andries Kalsbeek, Eric Fliers, Johannes A Romijn, S E La Fleur, Joke Wortel, O Bakker, E Endert, R M BuijsAbstract:At present it is not clear which factors are responsible for the diurnal pattern of plasma leptin levels, although the timing of food intake and circulating hormones such as glucocorticoids and insulin have both been proposed as independent determinants. In this study we show that ablation of the biological clock by thermal lesions of the hypothalamic suprachiasmatic nucleus (SCN) completely eliminates the diurnal pattern of plasma leptin levels. By contrast, removal of the diurnal corticosterone signal by adrenalectomy and corticosterone replacement did not affect diurnal plasma leptin levels. More importantly, removal of the nocturnal Feeding signal by submitting the animals to a regular Feeding Schedule of six meals per day did not abolish the diurnal plasma leptin levels. However, both SCN lesions and the regular Feeding Schedule did cause an increase in the 24-h mean plasma leptin levels. As neither rhythmic Feeding, insulin, or corticosterone signals can completely explain the diurnal plasma leptin ...
F J Sanchezvazquez - One of the best experts on this subject based on the ideXlab platform.
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effects of Feeding Schedule on locomotor activity rhythms and stress response in sea bream
Physiology & Behavior, 2009Co-Authors: J A Sanchez, Jose Fernando Lopezolmeda, Borja Blancovives, F J SanchezvazquezAbstract:Feeding cycles entrain biological rhythms, which enable animals to anticipate Feeding times and so maximize food utilization and welfare. In this article, the effect of mealtime was investigated in two groups of sea bream (Sparus aurata): one group received a single daily meal at random times during the light period (random daytime Feeding, RDF), whereas the other group received the meal during the light period but at the same time (Scheduled daytime Feeding, SDF). All the fish showed diurnal behavior, although the SDF group showed a lower percentage of diurnalism (84.4% vs. 79.5% in RDF and SDF respectively) and developed food anticipatory activity some hours before the mealtime. In addition, the mean daily locomotor activity of the RDF group was significantly higher than that of the SDF group (3132 vs. 2654 counts/day, respectively). Although the mean weight differed between both groups on day 30 (115.7 g and 125.6 g in RDF and SDF respectively), these differences had disappeared by day 60. Plasma cortisol and glucose significantly differed in both groups (cortisol: 71.8 vs. 8.7 ng/ml, glucose: 53.7 vs. 43.8 mg/dl in RDF and SDF, respectively), whereas lactate did not differ significantly. The results obtained suggest that altering the Feeding time (Scheduled vs. random) affects the behavior and physiology of sea bream, indicating that a single daily Feeding cycle (compared to random) is beneficial for fish welfare because they can prepare themselves for the forthcoming feed.
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effect of restricted Feeding Schedule on seasonal shifting of daily demand Feeding pattern and food anticipatory activity in european sea bass dicentrarchus labrax l
Chronobiology International, 2007Co-Authors: M Azzaydi, V C Rubio, F Martinez J Lopez, F J Sanchezvazquez, S Zamora, J A MadridAbstract:The effect of restricted Feeding Schedule was investigated on the seasonal shifting of daily demand-Feeding pattern and food anticipatory activity in European sea bass (Dicentrarchus labrax) held under natural environmental conditions in an outdoor laboratory. To that end, demand-Feeding behavior was continuously monitored for approximately one year in four groups of 15 fish each exposed to natural fluctuations of water temperature (from 13.2 degrees C to 27.4 degrees C) and photophase (from 9.5 h to 14.5 h of light). When the animals were subjected to a time-restricted Feeding Schedule, the demand-Feeding rhythm rapidly synchronized to the three periods of food availability: the first meal (FM) from 08:00 to 09:00 h, the second meal (SM) from 16:00 to 17:00 h, and the third meal (TM) from 00:00 to 01:00 h. The occurrence of demand-Feeding activity into the three periods of food availability displayed a double seasonal shift: fish that self-fed mostly during the daytime periods of Feeding availability (FM and SM) in summer and autumn changed to nocturnal Feeding (TM) from December to April, returning to diurnal preferences in April. Food-demands appeared to be predominantly associated with feed availability, reaching its maximum levels during the hours of reward. In addition, Feeding anticipatory activity (FAA) was observed. A relationship was detected between the duration of FAA and Feeding-time, with shortest FAA (30-60 min) when mealtime occurred just after sunrise (FM) or sunset (TM). These findings demonstrate the ability of sea bass to self-feed under time-restricted Schedules, and show a seasonal-phase inversion in demand-Feeding activity in spite of the restrictions in their Feeding availability. Sea bass can use external signals as reference to anticipate the time of feed availability. This information may be useful for designing new Feeding strategies for European sea bass fish farming.
