The morphology of bovine sweat glands and the effect of heat on the sweat glands of the Ayrshire calf

1960 ◽  
Vol 55 (2) ◽  
pp. 247-249 ◽  
Author(s):  
J. D. Findlay ◽  
D. McEwan Jenkinson
Keyword(s):  
Heat Stress ◽  
Sweat Gland ◽  
Sampling Technique ◽  
Skin Surface ◽  
Secretory Process ◽  
Sweat Glands ◽  
Active Secretion ◽  
Adult Cattle ◽  
Simple Diffusion ◽  
Hot Environment

1. The normal sweat glands of twenty-eight calves, nineteen live adult cattle and eighteen slaughtered cattle from temperate breeds were examined. In every animal the lumen of the sweat glands contained a fluid-like material.2. It appeared on examination and rough measurement that the size of the sweat glands taken from animals after slaughter was smaller than that of the glands taken from live animals even when the same sampling technique was used for both.3. The sweat glands of sixteen calves were examined before and at intervals after the animals had been subjected to a hot environment. The glands were always seen full of a fluid-like material.4. It is concluded that if the calf sweat gland is stimulated by heat stress it must function either (a) by simple diffusion through the sweat gland wall and hence to the skin surface, or (b) by a secretory process not involving degeneration of the glandular epithelium. It is probable that at least part of the contents of the lumen of the sweat glands is derived from the epithelium by a process of active secretion.

The function of cattle sweat glands.

1955 ◽  
Vol 6 (4) ◽  
pp. 640 ◽  
Author(s):  
KA Ferguson ◽  
DF Dowling
Keyword(s):  
Heat Loss ◽  
Sweat Gland ◽  
Skin Surface ◽  
Bromothymol Blue ◽  
Sweat Glands ◽  
Quantitative Measurements ◽  
Stereo Microscope ◽  
Hot Environments

Evidence is presented that the apocrine sweat glands of cattle have a temperature-regulating function. Under the stereo microscope, sweat droplets could be observed forming at the openings of the sweat gland ducts in response to intradermal injections of adrenaline, and during exposure to hot conditions. The sweat spots could be stained macroscopically, and prints showing the location of the spots were obtained with bromothymol blue papers pressed onto the skin surface. Quantitative measurements indicate that the evaporation of this sweat is the main source of heat loss in hot environments.

Human eccrine sweat gland activity and palmar electrical skin resistance

1965 ◽  
Vol 20 (5) ◽  
pp. 980-983 ◽  
Author(s):  
Thomas Adams ◽  
John A. Vaughan
Keyword(s):  
Sweat Gland ◽  
Skin Resistance ◽  
Skin Surface ◽  
Eccrine Sweat Gland ◽  
Sweat Glands ◽  
Evaporative Water ◽  
Palmar Surface ◽  
The Subject ◽  
Sudomotor Activity ◽  
Electrical Skin

Sweat gland activity, monitored as a function of the rate at which water vapor was removed from the skin surface (EWL), was measured simultaneously with electrical skin resistance (ESR) from adjacent 1-cm2 areas on the human palm. Both ESR and EWL, and Delta ESR and Delta EWL, were correlated throughout 20–30 min of testing during which the subject rested or participated in conversation. The ratio Delta ESR/Delta EWL was greater the lower the EWL level. As EWL approached diffusion levels (0.06 mg/min.cm2), ESR assumed the highest and most stable value (ca. 170 kilohms). Subject differences in ESR at high EWL rates and the pattern of ESR-EWL relationships through the range of sudomotor activity (0.06–0.18 mg/min.cm2) are attributed to individual variation in the density and activity of sweat glands on the palmar surface. The character of ESR-EWL correspondence was also seen to vary with the phase of sweating activity for any one subject. evaporative water loss; physiological testing; galvanic skin reflex; psychological testing; psychogalvanic reflex; sweat measurement Submitted on October 22, 1964

The sweat glands of Ayrshire cattle

1950 ◽  
Vol 40 (1-2) ◽  
pp. 126-133 ◽  
Author(s):  
J. D. Findlay ◽  
S. H. Yang
Keyword(s):  
Hair Follicle ◽  
Sweat Gland ◽  
Flank Region ◽  
Significant Negative Correlation ◽  
Skin Surface ◽  
Lower Limbs ◽  
Sweat Glands ◽  
Average Area ◽  
Body Regions ◽  
Secretory Products

1. An investigation has been made of the structure, distribution and dimensions of the so-called sweat glands in twenty-one different body regions of each of five 3- to 4-year-old Ayrshire cows, and incidental studies have been made on calves and embryos.2. It has been observed that in all those regions each hair follicle is accompanied by an arrector pili muscle, a sweat gland and a sebaceous gland. This combination has been designated a ‘hair follicle unit’.3. In the skin of embryos the sweat gland appears as a single unbranched tube and in the skin of calves and cows it is a bag-shaped gland with a long slender duct which opens on the skin surface as a funnel-shaped outlet.4. The gland is composed of two layers of cells, an outer myoepithelium and inner glandular epi thelium.5. What may be successive stages in the intraluminal transformation of the secretory products discharged by the gland cells lining the lumen, are illustrated by a series of photographs.6. The glands have a poor blood supply and appear to be apocrine. It is unlikely, therefore, that the sweat glands of Ayrshire cows function as effectively in heat regulation as human sweat glands.7. The number of sweat glands per sq.cm. of skin was measured in all the regions. The average number was 1871 per sq.cm., ranging from about 1000 in the lower limbs to about 2500 in the axilla and neck regions.8. The length and circumference of the gland were measured, hence its secretory surface was calculated. The average area of secretory surface of a single sweat gland was 0·22 sq.mm., while the average area of secretory surface of the sweat glands per sq.cm. of skin was 3·94 sq.cm. There was a significant negative correlation between the number of glands per sq.cm. and the area of secretory surface of a single sweat gland.9. The ventral region of the neck, the axilla and upper hindleg had the largest area of secretory surface per sq.cm. of skin, while the forehead, back (sacral), gluteus, lower foreleg and hindleg had the smallest.10. The only region which had a significantly smaller area of secreting surface than the front flank region was the sacral region of the back.

scholarly journals The use of 33 MHz ultra-high-frequency ultrasonography for the evaluation of sweat glands in the axilla with osmidrosis

PLoS ONE ◽  
2021 ◽  
Vol 16 (5) ◽  
pp. e0251600
Author(s):  
Akira Shinaoka ◽  
Ryuichi Nakahara ◽  
Masanori Saeki
Keyword(s):  
High Frequency ◽  
Sweat Gland ◽  
Strong Relationship ◽  
Skin Surface ◽  
Sweat Glands ◽  
Histological Techniques ◽  
Ultra High Frequency ◽  
Eccrine Glands ◽  
Histological Data ◽  
High Frequency Ultrasonography

Background This study aimed to assess the use of 33 MHz ultra-high-frequency ultrasonography (33MHz-UHFUS) for evaluating axillary sweat glands with osmidrosis in comparison with histological techniques. Axillary osmidrosis is a common problem in Asian societies, and the number and size of apocrine sweat glands have a strong relationship with osmidrosis severity. Currently, there are no methods to evaluate sweat gland distribution non-invasively. Methods In this study, 35 skin specimens from 10 fresh human cadavers without osmidrosis and retrospective ultrasonographic images from 20 patients with osmidrosis were used. Skin specimens were embedded in paraffin, thinly sliced, and finally stained with hematoxylin and eosin. Histologically, the apocrine and eccrine glands were evaluated, and the top and bottom depths of follicles were measured from the skin surface. In 33 MHz ultrasonography images, the depths of sweat glands were measured, and the mean grey value was calculated using Image J. Results Compared to histological data, 33MHz-UHFUS could be used to identify sweat glands as a hyperechoic structure between the dermis and fat layer. Furthermore, it could evaluate sweat gland distribution but could not distinguish between types of sweat glands. Conclusions The distribution of sweat glands in the axilla can be non-invasively evaluated via 33MHz-UHFUS.

scholarly journals Recent Impact of Microfluidics on Skin Models for Perspiration Simulation

Membranes ◽  
2021 ◽  
Vol 11 (2) ◽  
pp. 150
Author(s):  
Genís Rabost-Garcia ◽  
Josep Farré-Lladós ◽  
Jasmina Casals-Terré
Keyword(s):  
Sweat Gland ◽  
Ethical Issues ◽  
Wearable Sensors ◽  
Surface Characteristics ◽  
Skin Surface ◽  
Wearable Technology ◽  
Alternative Strategies ◽  
Accurate Model ◽  
Key Features

Skin models offer an in vitro alternative to human trials without their high costs, variability, and ethical issues. Perspiration models, in particular, have gained relevance lately due to the rise of sweat analysis and wearable technology. The predominant approach to replicate the key features of perspiration (sweat gland dimensions, sweat rates, and skin surface characteristics) is to use laser-machined membranes. Although they work effectively, they present some limitations at the time of replicating sweat gland dimensions. Alternative strategies in terms of fabrication and materials have also showed similar challenges. Additional research is necessary to implement a standardized, simple, and accurate model representing sweating for wearable sensors testing.

scholarly journals Experiments on Energy-Efficient Evaporative Cooling Systems for Poultry Farm Application in Multan (Pakistan)

2021 ◽  
Vol 13 (5) ◽  
pp. 2836
Author(s):  
Khawar Shahzad ◽  
Muhammad Sultan ◽  
Muhammad Bilal ◽  
Hadeed Ashraf ◽  
Muhammad Farooq ◽  
...  
Keyword(s):  
Heat Stress ◽  
Low Cost ◽  
Evaporative Cooling ◽  
Thermal Exposure ◽  
Climatic Conditions ◽  
The Body ◽  
Dew Point ◽  
Sweat Glands ◽  
Cooling Systems ◽  
Humidity Index

Poultry are one of the most vulnerable species of its kind once the temperature-humidity nexus is explored. This is so because the broilers lack sweat glands as compared to humans and undergo panting process to mitigate their latent heat (moisture produced in the body) in the air. As a result, moisture production inside poultry house needs to be maintained to avoid any serious health and welfare complications. Several strategies such as compressor-based air-conditioning systems have been implemented worldwide to attenuate the heat stress in poultry, but these are not economical. Therefore, this study focuses on the development of low-cost and environmentally friendly improved evaporative cooling systems (DEC, IEC, MEC) from the viewpoint of heat stress in poultry houses. Thermodynamic analysis of these systems was carried out for the climatic conditions of Multan, Pakistan. The results appreciably controlled the environmental conditions which showed that for the months of April, May, and June, the decrease in temperature by direct evaporative cooling (DEC), indirect evaporative cooling (IEC), and Maisotsenko-Cycle evaporative cooling (MEC) systems is 7–10 °C, 5–6.5 °C, and 9.5–12 °C, respectively. In case of July, August, and September, the decrease in temperature by DEC, IEC, and MEC systems is 5.5–7 °C, 3.5–4.5 °C, and 7–7.5 °C, respectively. In addition, drop in temperature-humidity index (THI) values by DEC, IEC, and MEC is 3.5–9 °C, 3–7 °C, and 5.5–10 °C, respectively for all months. Optimum temperature and relative humidity conditions are determined for poultry birds and thereby, systems’ performance is thermodynamically evaluated for poultry farms from the viewpoint of THI, temperature-humidity-velocity index (THVI), and thermal exposure time (ET). From the analysis, it is concluded that MEC system performed relatively better than others due to its ability of dew-point cooling and achieved THI threshold limit with reasonable temperature and humidity indexes.

scholarly journals The Sweat Glands and Hair Follicles of European Cattle

1972 ◽  
Vol 25 (3) ◽  
pp. 585 ◽  
Author(s):  
D Mcewan Jenkinson ◽  
T Nay
Keyword(s):  
Hair Follicle ◽  
Sweat Gland ◽  
Hair Follicles ◽  
Sweat Glands ◽  
Mean Values ◽  
The Mean ◽  
European Cattle

Measurements were made on the skins of 1363 cattle from different European breeds. The mean values of these measurements have been tabulated for each breed and the skin types present in each breed or group of breeds have been determined using sweat gland shape (LID) and hair follicle depth (FrY) as the principal bases of comparison.

Heat stress induces ultrastructural changes in cutaneous capillary wall of heat-acclimated rock pigeon

1999 ◽  
Vol 277 (4) ◽  
pp. R967-R974 ◽  
Author(s):  
Yehuda Arieli ◽  
Neomi Feinstein ◽  
Pnina Raber ◽  
Michal Horowitz ◽  
Jacob Marder
Keyword(s):  
Heat Stress ◽  
Heat Exposure ◽  
Ultrastructural Changes ◽  
Water Evaporation ◽  
Adrenergic Agonist ◽  
Hot Environment ◽  
Adrenergic Antagonist ◽  
Cooling Mechanism ◽  
Cutaneous Evaporation ◽  
Endothelial Gaps

In heat-acclimated rock pigeons, cutaneous water evaporation is the major cooling mechanism when exposed at rest to an extremely hot environment of 50–60°C. This evaporative pathway is also activated in room temperature by a β-adrenergic antagonist (propranolol) or an α-adrenergic agonist (clonidine) and inhibited by a β-adrenergic agonist (isoproterenol). In contrast, neither heat exposure nor drug administration activates cutaneous evaporation in cold-acclimated pigeons. To elucidate the mechanisms underlying this phenomenon, we studied the role of the ultrastructure and permeability of the cutaneous vasculature. During both heat stress and the administration of propranolol and clonidine, we observed increased capillary fenestration and endothelial gaps. Similarly, propranolol increased the extravasation of Evans blue-labeled albumin in the skin tissue. We concluded that heat acclimation reinforces a mechanism by which the activation of adrenergic signal transduction pathways alters microvessel permeability during heat stress. Consequently the flux of plasma proteins and water into the interstitial space is accelerated, providing an interstitial source of water for sustained cutaneous evaporative cooling.

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