Publications by authors named "M R Achaaban"
Rumination shows a nocturnal rhythmic pattern in day-active ruminants. Although feeding has been shown to quantitatively modulate rumination, it is not clear yet if feeding rhythm plays a causal role in rumination rhythm. The present study was carried out to determine whether the daily rhythm of rumination in goats under natural environmental conditions is food-dependent or not, and whether it is modulated by the season.
View Article and Find Full Text PDFThe 'first night effect' (FNE) is a well-known phenomenon in polysomnographic (PSG) sleep studies, resulting in significant variations in the macrostructure of wakefulness and sleep states, particularly between the initial and subsequent sleep recording sessions. The FNE phenomenon during sleep has been studied in various species, revealing complex variations between several sessions of sleep recording. The present study used a non-invasive PSG method to examine differences between various vigilance states in four adult female dromedary camels during 4 consecutive nights and days of sleep recording.
View Article and Find Full Text PDFArticle Synopsis
- The study focuses on how the dromedary camel's ovulation is induced by a substance called beta nerve growth factor (β-NGF) found in male sperm.
- Researchers conducted experiments showing that injecting β-NGF into female camels led to ovulation, with noticeable increases in hormones like LH and progesterone over time.
- The results also revealed that β-NGF activates specific neurons in the brain, particularly those involved in reproductive control, which may play a key role in triggering ovulation.
Study Objectives: To investigate sleep patterns in the camel by combining behavioral and polysomnography (PSG) methods.
Methods: A noninvasive PSG study was conducted over four nights on four animals. Additionally, video recordings were used to monitor the sleep behaviors associated with different vigilance states.
In the dromedary camel, a well-adapted desert mammal, daily ambient temperature (T)-cycles have been shown to synchronize the central circadian clock. Such entrainment has been demonstrated by examining two circadian outputs, body temperature and melatonin rhythms. Locomotor activity (LA), another circadian output not yet investigated in the camel, may provide further information on such specific entrainment.
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