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aggression; body size; breeding; energy costs; heart rate; penguins; resting metabolic rate; seabirds; sleep; territoriality
Abstract:
... Aggressive behaviour associated with the defence of a territory is thought to impose substantial energy costs and thus to represent a trade-off with other energy-demanding activities. The energy costs of aggressive behaviours, however, have rarely been estimated in the wild, and the overall contribution of territorial defence to daily energy expenditure has never been determined. We studied the ac ...
... Dip listening refers to our ability to catch brief ‘acoustic glimpses’ of speech and other sounds when fluctuating background noise levels momentarily decrease. Exploiting dips in natural fluctuations of noise contributes to our ability to overcome the ‘cocktail party problem’ of understanding speech in multitalker social environments. We presently know little about how nonhuman animals solve anal ...
... BACKGROUND: A central question for ecologists is the extent to which anthropogenic disturbances (e.g. tourism) might impact wildlife and affect the systems under study. From a research perspective, identifying the effects of human disturbance caused by research-related activities is crucial in order to understand and account for potential biases and derive appropriate conclusions from the data. RE ...
... In colonial breeders, agonistic interactions between conspecifics are frequent and may have significant physiological implications. Physiological responses (e.g., increased heart rate) to such social stressors may be determined by the potential costs of agonistic interactions, such as personal injury or risk of breeding failure, and by the motivation of the individuals concerned. The latter may va ...
... The aim of this study was to evaluate the stress response of stallions (n = 16) aged 3–13 years with previous sexual experience to semen collection by determination of heart rate, heart rate variability, and cortisol in saliva. Recordings were done on two consecutive days. The time intervals from leaving the box until arrival in the collection barn and from first exposure to the teaser mare until ...
... Trainers have reported horses to be calmer and easier to train after receiving a calcium- and magnesium-rich mineral supplement derived from a calcified algae source. The purpose of this study was to test whether horses receiving this supplement were calmer than horses receiving a placebo. Fourteen 2-year-old Arabians in training were subjected to a ‘moving object reactivity test’ (MORT) and ‘hand ...
... In many countries completing the performance test requirements is obligatory only for stallions, but some breeders also decide for the assessment of their mares’ performance under standardized conditions. This study is aimed the evaluation of sex related effects on behavioral and physiological reactivity in fearfulness test and performance test scores in Polish warmblood horses of Małopolska breed ...
body temperature; breeding; captive animals; climate; courtship; energy expenditure; fasting; forage; heart rate; males; oviposition; penguins; physical activity; seabirds
Abstract:
... For seabirds that forage at sea but breed while fasting on land, successful reproduction depends on the effective management of energy stores. Additionally, breeding often means aggregating in dense colonies where social stress may affect energy budgets. Male king penguins (Aptenodytes patagonicus) fast for remarkably long periods (up to 1·5 months) while courting and incubating ashore. Although t ...
... The aim of the study was to evaluate the possibility of using heart rate (HR) as a metric parameter that can be used for the characterisation of behaviour of primitive horses and their relatives, related to reactions to the stress resulting from the contact with humans and adaptation to living in various conditions, including natural environment. This characterisation served the authors to expand ...
... The main function of male sexual advertisement calls is to attract females, and therefore, most studies of responses to calls focus on females. Males may, however, respond to the calls of other males in some species, for one of two reasons: (1) to parasitize the calling of an attractive male by sitting close by and mating with attracted females, or (2) to locate breeding aggregations. We hypothesi ...
... In humans, associations between anxiety and nausea (including motion-induced) are reported but the underlying mechanisms are not known. Hypothermia is proposed to be an index of nausea in rats. Utilising hypothermia and heart rate as outcome measures we investigated the response to provocative motion in rats selectively bred for high (HAB) and low (LAB) anxiety-related behaviors and in non-selecte ...
bitches; breeding; cats; heart rate; medicine; neonates; ovulation; parturition; pets; prediction; pregnancy; radiography; radiology; small animal practice; surgery; ultrasonography; England
Abstract:
... Accurate prediction of delivery date in canine and feline allows a better management of parturition, reducing the loss of neonates. This review evaluates the most common methods adopted to accurately predict the day of delivery: determination of ovulation and hormonal assays, first appearance of embryonic/foetal structures using ultrasound or radiography, echographic measurement of extra‐foetal an ...
... Mitral valve (MV) disease is the most important valvular condition affecting athletic performance in horses. Twenty and 22 years old Thoroughbred Stallions used for breeding had suffered from increased respiratory and heart rate, poor performance and incomplete ejaculate release during covering, since three months ago. Cardiac examination projected irregular cardiac rhythm after a halt and an earl ...
Salmo salar; breeding; environmental factors; fish; heart rate; natural selection; rivers; summer; water temperature
Abstract:
... Cardiac performance in fishes is predicted to be shaped by environmental factors such as temperature and river flow rate through natural selection for local adaptations, but few studies have explored these relationships. Using a common garden breeding design, we collected heart rate data from three populations of Atlantic salmon (Salmo salar) to measure peak heart rate and estimate optimal and upp ...
Red Sokoto; Sahel; T-lymphocytes; alleles; breeding; evolutionary adaptation; exons; genetic resistance; genetic variation; goats; heart rate; heat stress; heat tolerance; heterozygosity; loci; major histocompatibility complex; phylogeny; regulatory proteins; restriction endonucleases; restriction fragment length polymorphism; single nucleotide polymorphism; tropics; Nigeria
Abstract:
... Host defense in vertebrates depend on many secreted regulatory proteins such as major histocompatibility complex (MHC) class II which provide important regulatory and effector functions of T cells. Gene polymorphism in the second exon of Capra-DRB gene in three major Nigerian goat breeds [West African Dwarf (WAD), Red Sokoto (RS), and Sahel (SH)] was analyzed by restriction fragment length polymor ...
... A 20-year-old warmblood breeding stallion presented to a University practice for semen collection and evaluation was incidentally diagnosed with atrial fibrillation (AF). Electrocardiogram recordings during breeding revealed inappropriately rapid tachycardia and occasional ventricular premature depolarizations/aberrant ventricular conduction. Transvenous electrical cardioversion was performed. Aft ...
... Mystus gulio, the long whiskers catfish, is a popular food fish and potential candidate species for aquaculture in Sundarban area of India and Bangladesh. Recently, catch of this species has declined due to overfishing and various ecological changes. In the present study, mature fish was induced to spawn in captivity through intramuscular injection of human chorionic gonadotropin at the doses of 1 ...
... Reproductive and teratogenic effects of endosulfan were investigated by exposure of mature breeding zebrafish (Danio rerio) to environmentally relevant concentrations of 0.01–1.2 μg L⁻¹ and monitoring their spawning, fertilization success, and gonad histology. Fertilization success was negatively correlated to duration of exposure at endosulfan concentration of 1.2 μg L⁻¹. No apparent effect was o ...
... The deposition of semen into the uterus of the horse induces a transient innate immune response that lasts 24–36 h in the normal mare. There exists a subset of mares that are unable to resolve this inflammation in a timely manner, and are classified as susceptible to the disease of persistent breeding-induced endometritis (PBIE). Lactoferrin is a protein of interest as a potential therapeutic for ...
... Physiological stress in captive wild animals may be caused by stressors such as capture, handling, and transport. Continuous strong stimulation may induce a long-term physiological stress in captive wild animals after transport. Fecal Glucocorticosteroid Metabolites (FGM), vital signs and behavioral changes were used to establish stress responses of white rhinoceros during a translocation process. ...
... The courtship behavior of some species of birds can be energetically demanding, but it is unknown if cardiovascular specializations enable such behaviors. While performing a highly acrobatic courtship dance, heart rate in male golden-collared manakins increases briefly to 1300 beats per minute, among the highest heart rates recorded in any bird or mammal. We hypothesize that male manakins have enh ...
... The competitive edge of the National horse breeds in Norway is assumed to be strengthened by utilizing their temperament as a trait in the breeding goal. Previously, the temperament of the Norwegian horse breeds is described through five common factors, and there is a need for developing a test for temperament. In this study, 63 horses were tested at 6 different farms, through a proposed test proc ...
... Horses are routinely transported for access to safe off-road riding, veterinary care, breeding, sale, or moving to a new home environment. However, transport is a known stressor in horses. For this reason, problem behavior when loading is a commonly reported issue, which presents risks to handlers and horse welfare. Existing literature and manufacturers' recommendations suggests that alpha-casozep ...
... Zhikong scallop (Chlamys farreri Jones et Preston 1904) is one of the most economically important shellfish in the aquaculture industry of China. Improving thermal tolerance of the scallop by breeding has become a critical task for the sustainable farming industry. The detection of the majority of the current indicators of the thermal tolerance of the scallop is generally short-term, low-throughpu ...