Medicine and Health Sciences Commons^™

Assessment Of Iso Heart Rate Method To Estimate Metabolic Rate, Karl Williams

USF Tampa Graduate Theses and Dissertations

Thermal equilibrium is primarily maintained by the body’s ability to dissipate internal heat generated during muscle contraction. A number of methods have been used to quantify this thermal burden such as charts and observation of workplace activities and behavior, however these have varying levels of validity. ISO 8996 defines a more accurate method of metabolic rate estimation that uses heart rate and maximal work capacity (MWC); however this requires the use of laboratory settings and equipment that are rarely available in the field. Equations such as the ACSM metabolic equation for the total energy expenditure of walking, hereafter referred to …

Evaluation Of Two Methods To Estimate Wet Bulb Globe Temperature From Heat Index, Stephi Pofanl

USF Tampa Graduate Theses and Dissertations

The Wet bulb globe temperature (WBGT) is a common method to evaluate environmental factors that contribute to occupational heat stress. The Heat Index (HI) is readily available as an alternative to exposure methods. They both assess the most important contributors that are air temperature and humidity. WBGT also includes radiant heat and air motion. To account for radiant heat and/or air motion, some investigators have suggested adjustments to HI. The purpose of this study is to explore two methods to estimate the usefulness of WBGT from HI.

WBGT data were collected in a variety of locations that included direct sun …

A Work-Related Thyrotoxic Periodic Paralysis In A Worker Exposed To Heat Stress: A Case Report, Shanti Puji Lestari, Muchtaruddin Mansyur

Occupational and Environmental Medicine Journal of Indonesia

Thyrotoxic Periodic Paralysis (TPP) is an uncommon disorder, characterized by the triad of acute hypokalemia, muscle paralysis, and thyrotoxicosis. Attacks are typically transient, last hours to days, and may be triggered by many conditions, including exposure to heat stress in both indoor and outdoor activities. Indoor workers, especially those working around furnaces, ovens, smelters, and boilers, are at a higher heat stress risk, even higher risk if they have other individual factors such as obesity, dehydration, slower heat acclimation, consume certain medications and presence of underlying diseases. A 48-year-old man presented a sudden onset weakness in all four limbs, associated …

Rectal Temperature And Respiration Rate As Indicators Of Heat Stress In Broiler Chickens Subjected To Early-Age Thermal Conditioning And Vitamin C Supplementation, Zoran Ruzic, Zdenko Kanacki, Slobodan Stojanovic, Zorana Kovacevic, Slobodan Knezevic, Srdan Todorovic, Smiljana Paras

Turkish Journal of Veterinary & Animal Sciences

One of the major concerns in poultry production presents heat stress (HS) and it is followed by significant economic loss manifested by reduced growth, decreased immune response, increased mortality, etc. The objective of this study was to investigate whether the early-age thermal conditioning (ETC) and vitamin C (Vit.C) treatments, individually and in combination, produce their beneficial effects through increased heat release manifested as a change in respiration rate consequentially leading to a decrease in the chicken's body temperature and thus reduce the harmful effects of HS. A 400 broiler chicks mixed sex male and female were split into four groups. …

How Climate Change May Threaten Progress In Neonatal Health In The African Region, Britt Nakstad, Veronique Filippi, Adelaide Lusambili, Nathalie Roos, Fiona Scorgie, Matthew F. Chersich, Stanley Luchters, Sari Kovats

Institute for Human Development

Climate change is likely to have wide-ranging impacts on maternal and neonatal health in Africa. Populations in low-resource settings already experience adverse impacts from weather extremes, a high burden of disease from environmental exposures, and limited access to high-quality clinical care. Climate change is already increasing local temperatures. Neonates are at high risk of heat stress and dehydration due to their unique metabolism, physiology, growth, and developmental characteristics. Infants in low-income settings may have little protection against extreme heat due to housing design and limited access to affordable space cooling. Climate change may increase risks to neonatal health from weather …

Physiological Mechanisms Of The Impact Of Heat During Pregnancy And The Clinical Implications: Review Of The Evidence From An Expert Group Meeting, Louisa Samuels, Britt Nakstad, Nathalie Roos, Ana Bonell, Matthew Chersich, George Havenith, Stanley Luchters, Louise-Tina Day, Jane E. Hirst, Tanya Singh

Population Health, East Africa

Many populations experience high seasonal temperatures. Pregnant women are considered vulnerable to extreme heat because ambient heat exposure has been linked to pregnancy complications including preterm birth and low birthweight. The physiological mechanisms that underpin these associations are poorly understood. We reviewed the existing research evidence to clarify the mechanisms that lead to adverse pregnancy outcomes in order to inform public health actions. A multi-disciplinary expert group met to review the existing evidence base and formulate a consensus regarding the physiological mechanisms that mediate the efect of high ambient temperature on pregnancy. A literature search was conducted in advance of …

Cryopreservation Of Nili-Ravi Buffalo Bull Semen: Yearly Postthaw Analyses To Depict Climatic Effects, Ejaz Ahmad, Muhammad Shakeel, Zahid Naseer, Adeel Ahmed, Mudussar Nawaz, Muhammad Saleem Akhtar

Turkish Journal of Veterinary & Animal Sciences

The present study was aimed to observe the postthaw quality of Nili-Ravi buffalo bull semen cryopreserved during heat stress (hot summer months) and normal climatic conditions (fall, winter, and spring months). For this purpose, four (n = 4) adult regular donor Nili-Ravi buffalo bulls were selected to collect and cryopreserve their semen throughout the period of an entire year. The cryopreservation of semen was done following standard freezing protocol. The semen doses cryopreserved during heat stress and normal climatic condition were thawed to determine the sperm motility, motion kinetics, viability, plasma membrane integrity, acrosomal integrity, and morphological abnormalities (head, mid-piece, …

Acute Phase Proteins, Endocrine And Productive Responses Of Laying Hens To Heat Stress, Amani Aldawood, Hosam Altamimi

Turkish Journal of Veterinary & Animal Sciences

This study was designed to characterize changes in the acute phase proteins (APPs), hormones parallel to performance, and egg quality traits in laying hens exposed to heat stress (HS). A total of 120 sixteen-week-old Lohmann hens was allowed an adaptation period of 5 weeks in 3 different rooms at 21 °C. The hens were then exposed to one of three climatic thermal treatments over the next 6 weeks; thermoneutrality (TN, 21 °C), constant (C-HS, 28 °C), and cyclic HS (HS, 20 h/d at 28 ± 1 °C and 4 h/d at 33 ± 1 °C). Blood samples were weekly obtained, …

The Effects Of Acute Hyperthermia On The Neurovascular Unit, Brooke Renee Shepley

Electronic Theses and Dissertations

With growing use for hyperthermia as a cardiovascular therapeutic, there is surprisingly little information regarding the acute effects it may have on the integrity of the neurovascular unit (NVU). Indeed, relying on animal data would suggest hyperthermia comparable to levels attained in thermal therapy will disrupt the blood- brain barrier (BBB) and damage the cerebral parenchymal cells. We sought to address the hypothesis that controlled passive hyperthermia is not sufficient to damage the NVU in healthy adults. Eleven young men (age 23 ± 3 years) underwent acute passive heating until +2°C or absolute esophageal temperature of 39.5°C. The presence of …

Does Time-Weighted Averaging For Wbgt And Metabolic Rate Work For Work-Recovery Cycles?, John W. Flach

USF Tampa Graduate Theses and Dissertations

Heat stress affects thousands of works annually by causing heat-related illnesses. Wet bulb globe temperature (WBGT) is a widely accepted metric to assess the environmental contributions to heat stress. WBGT-based occupational exposure limits (OELs) include the ACGIH TLVs and the NIOSH RELs. The OEL threshold is adjusted downward with increasing metabolic rate. Further, there is an OEL for acclimatized and non-acclimatized workers. An often-recommended intervention found within a heat stress management program is work-recovery cycles to manage exposure. To prescribe work-recovery cycles, the common practice is to use time-weighted averaging (TWA) for the WBGT and the metabolic rate. The purpose …

Novel Heat Index Models For Subtropical Region Based On Daily Milk Production Incrossbred Holstein Cows, Neeraj Kashyap, Atish Kumar Chakravarty, Bharti Deshmukh

Turkish Journal of Veterinary & Animal Sciences

The quantification of the effect of heat stress imposed due to higher rate of heat gain on animal production is a prerequisite while estimating effects of heat stress. Temperature humidity index (THI) models developed empirically using meteorological parameters have been utilized as an indicator of heat stress. This study attempted to develop a heat index model with respect to productivity of the crossbred Holstein cows. More than 1.23 million daily milk yield records of 1860 crossbred cattle spread over a duration of 30 years were utilized. Statistically significant (p < 0.0001) partial regression coefficients were estimated as 0.0748 ± 0.0009 for dry bulb temperature (T$_{db}$) and -0.2228 ± 0.0011 for wet bulb temperature in model 1, -0.0182 ± 0.0005 T$_{db}$ and -0.1205 ± 0.0006 for vapour pressure in model 2, -0.0150 ± 0.0006 for Tdb and -0.1151 ± 0.0006 for dew point temperature in model 3 while as -0.1283 ± 0.0004 for T$_{db}$ and -0.0394 ± 0.0002 for relative humidity in model 4. The ratio of the partial regression coefficients of meteorological parameters (ß2/ß1) was -2.9791 in model 1, 6.8739 in model 2, 7.6731 in model 3 and 0.3073 in model 4. The developed THI models are based on the effect of meteorological parameters on daily productivity of the dairy animals, so the weightages to meteorological parameters were contrastingly different than the reported THI models. These models may successfully be used to evaluate the impact of heat stress on crossbred Holstein cows with respect to milk productivity and many other traits.

Tudor Staphylococcal Nuclease Is A Docking Platform For Stress Granule Components And Is Essential For Snrk1 Activation In Arabidopsis, Emilio Gutierrez-Beltran, Pernilla H. Elander, Kerstin Dalman, Guy W. Dayhoff, Panagiotis N. Moschou, Vladimir N. Uversky, Jose L. Crespo, Peter V. Bozhkov

Molecular Medicine Faculty Publications

Tudor staphylococcal nuclease (TSN; also known as Tudor-SN, p100, or SND1) is a multifunctional, evolutionarily conserved regulator of gene expression, exhibiting cytoprotective activity in animals and plants and oncogenic activity in mammals. During stress, TSN stably associates with stress granules (SGs), in a poorly understood process. Here, we show that in the model plant Arabidopsis thaliana, TSN is an intrinsically disordered protein (IDP) acting as a scaffold for a large pool of other IDPs, enriched for conserved stress granule components as well as novel or plant-specific SG-localized proteins. While approximately 30% of TSN interactors are recruited to stress granules …

An Analysis Of A Herd-Based Lactation Curve Reveals The Seasonal Effect From Dairy Cows Fed Under High Ambient Temperatures, Sumpun Thammacharoen, Somchai Chanpongsang, Narongsak Chaiyabutr, Supattra Teedee, Attapol Pornprapai, Aemwika Insam-Ang, Channarong Srisa-Ard, Niran Channacoop

The Thai Journal of Veterinary Medicine

The presentinvestigation was carried out to demonstratethe effect of high ambient temperature (HTa) on lactation performance with herd-based measurement. One large dairy farm in Thailandwith more than 300crossbred Holstein cows milking each monthwas selected. The meteorological data was recorded once a week during the period of observation. Milking cows (n=90) were observed for a 10-month lactation curve based on their calving seasons: Summer, rainy and winter. The lactation curve was fitted by nonlinear regression using the reduced lactation persistency model.The climatic conditions revealed a high degree of temperature and humidity index (THI). The average THI throughout the year was 84.8 …

The Effect Of Acute And Chronic Thermotherapy On Type 2 Diabetic Skeletal Muscle Cell Viability And Gene Expression: Pilot Study, Louay Bachnak, Jean Sparks, Xavier F. Gonzales, Daniel Newmire, Felix Omoruyi

International Journal of Exercise Science: Conference Proceedings

Diabetes is a chronic metabolic disease affecting millions of people globally. Type 2 diabetes is associated with insulin resistance or a defective secretion of insulin from the pancreas. The skeletal muscle system accounts for 80% of glucose uptake and is a vital player in healthy aging and muscle mass maintenance. PURPOSE: The purpose of this study was to investigate the effects of thermotherapy on gene expression and cell viability in Type 2 Diabetic skeletal muscle. METHODS: Human skeletal muscle myoblast (HSMM) and Diabetic Type 2 human skeletal muscle myoblast (D-HSMM) (Lonza Inc, Walkersville, MD) were cultured until 90% confluency was, …

Ginkgo Biloba Extract Egb761 Improved Anti-Heat Stress Responses In Chickens In Vivo Via Regulation Of Heat-Shock Protein Expression And Distribution, Xiaohui Zhang, Miao Zhang, Endong Bao

Turkish Journal of Veterinary & Animal Sciences

Heat stress is a lethal threat to chickens. This study investigated the protective effect of a Ginkgo biloba extract EGB761 against heat stress in chickens in vivo. A total of 200 one-day-old hens were separated randomly into control (Con), heat stress (HS), 0.1% EGB administration and heat stress (0.1% EGB+HS), 0.3% EGB administration and heat stress (0.3% EGB+HS), and 0.6% EGB administration and heat stress (0.6% EGB+HS) groups. After EGB761 administration for 45 days, ten chickens were selected randomly, assigned to one of the designated groups, and exposed to a one-time heat stress condition of 38 ± 1 °C for …

Thermal Rearing Environment Effect On Behavior And Metabolic Profile Of Laying Hens, Erika Rosendo De Sena Gandra, Rodrigo Garófallo Garcia, Gisele Aparecida Felix, Paulo Henrique Braz, Claudia Marie Komiyama, Ireilza De Alencar Nääs, Fabiana Ribeiro Caldara, Sandriele Goes De Campos Deboleto, Maria Fernanda De Castro Burbarelli, Kleber Pelicia

Turkish Journal of Veterinary & Animal Sciences

For the trial, 54 Bovans White laying hens were used at 95 weeks of age and were housed in groups of three birds per cage. A completely randomized design was used with a factorial scheme of treatments 2 × 3 (rations with two energy densities × three thermal environments). Corn-soybean meal based diets with similar composition, differing only in energy levels, were obtained with soybean oil inclusion (2750 kcal and 3250 kcal metabolizable energy (ME)). Climate-controlled rooms were used to mimic a thermoneutral environment (TE) (average temperature of 24.3 °C and relative humidity of 62.3%), a hot environment (HE) (average …

Biochemical And Physiological Responses Of Nili-Ravi Buffalo (Bubalus Bubalis) To Heatstress, Umair Younas, Muhammad Abdullah, Jalees Ahmed Bhatti, Nisar Ahmed, Faisal Shahzad, Musadiq Idris, Sana Tehseen, Muhammad Junaid, Saima Tehseen, Saeed Ahmed

Turkish Journal of Veterinary & Animal Sciences

The present study was designed with an objective to evaluate the impact of various strategies to alleviate heat stress on certain physiological attributes viz. respiratory rate (RT), body surface temperature (BST), pulse rate (PR), and respiratory rate (RR); biochemical attributes viz. glucose, total protein (TP), and cholesterol; and endocrinological parameters (tri-iodothyronine and tetraiodothyronine) of the Nili-Ravi buffaloes during early summer season. Lactating Nili-Ravi buffaloes (n = 20) with close production and parity stage were divided into four treatment groups as group A (control group under roof shades only), B (experimental group under roof shades with antistress supplementation), C (experimental group …

The Effect Of Year, Month, Region, And Herd Size On Bulk Tank Somatic Cell And Standardplate Count, And The Determination Of Optimum Herd Size In The Intensive Holsteinfriesian Dairy Farms In The Turkish Republic Of Cyprus, Hati̇ce Di̇lek Arsoy

Turkish Journal of Veterinary & Animal Sciences

The objective of this study was to determine the effects of mount, year, region, and herd size on the bulk tank somatic cell count (SCC) and standard plate count (SPC) and total milk production of Holstein Friesian cows and to decide for optimum herd size in Northern Cyprus. The total number of cattle was 64,450 heads and the number of enterprises was 168 in 2016. The milk samples were collected once or twice a month from each herd. SCC and SPC were determined with the Fluoro-opto-electronic counter method. Herd sizes were described from small to extra-large enterprises for Northern Cyprus …

The Influence Of Vitamin C And Early-Age Thermal Conditioning On The Quality Of Meat And Specific Production Characteristics Of Broilers During Heat Stress, Zoran Ruzic, Zdenko Kanacki, Marija Jokanovic, Suzana Vidakovic, Slobodan Knezevic, Slavoljub Jovic, Smiljana Paras

Turkish Journal of Veterinary & Animal Sciences

Heat stress (HS) is one of the greatest problems in contemporary chicken production and it entails significant economic losses. The purpose of this paper is to examine the influence of early-age thermal conditioning (ETC), vitamin C (Vit C) supplementation, and their combination on the production characteristics and specific quality parameters of the meat of broilers which were exposed to chronic HS in the last two weeks of breeding. Four hundred broilers (Cobb 500) of both sexes were divided into 4 experimental groups. Group C was given Vit C (2 g/L) dissolved in water from day 22 until the end of …

Nutrient Digestibility, Performance, And Egg Quality Traits Of Quails Raised In Different Stocking Densities And Ascorbic Acid Supplementation In A Hot, Tropical Environment, Adi Ratriyanto, Firmanda Firmanda, Heni Purwanti, Murjoko Murjoko

Turkish Journal of Veterinary & Animal Sciences

This study investigated the effects of stocking density (SD) and ascorbic acid (AA) supplementation on nutrient digestibility and laying performance of quails in a tropical environment. Four hundred and eight Japanese quails were designated in a 3 × 2 factorial arrangement with four replicates. The birds were distributed to three SDs, namely 40 (SD-1), 45 (SD-2), and 50 birds per m2 (SD-3) by allotting 15, 17, and 19 birds per cage, respectively (cage size: 3750 cm2). Each SD was supplemented with AA (0 and 250 mg/kg). Interaction was identified between SD and AA on egg production (P < 0.01), while the highest value was yielded in SD-2 supplemented with AA (83.6%). SD-3 achieved lower ether extract (EE) and crude fiber (CF) digestibility (P < 0.05) and eggshell thickness (P = 0.01) than SD-1 or SD-2. AA supplementation enhanced dry matter (DM), EE, CF, crude ash (CA), and calcium (Ca) digestibility (P < 0.05). AA improved egg weight, feed conversion, and protein and energy efficiency ratios as well as eggshell weight and thickness (P < 0.05). The SD of 45 birds per m2, combined with AA supplementation at 250 mg/kg, can be recommended for quails housed in hightemperature environments.

Heat Exposure And Adaptation Strategies Of Outdoor Informal Sector Workers In Urban Bulawayo - Zimbabwe, Bigboy Ngwenya

Theses: Doctorates and Masters

Ambient temperatures have risen over the past few decades and are expected to increase even further due to climate change impacts. Extreme temperatures, accompanied by high humidity levels, will exacerbate occupational heat stress, heat related illnesses and mortality amongst vulnerable groups, particularly among outdoor workers in developing countries in the tropics. In Bulawayo, Zimbabwe, a large portion of the population work outdoors in the informal sector as street vendors (hawkers) due to a lack of employment opportunities. These hawkers spend long hours in the sun or under makeshift sheds with poorly developed adaptation strategies, and no access to cooling systems …

The Effects Of Mild Dehydration On Cycling Performance In The Heat, Elika Hamer

Health, Human Performance and Recreation Undergraduate Honors Theses

Abstract

Introduction: Hypohydration exceeding 2% of body mass (bm), affected by heat and thirst level, leads to decreased athletic performance. Both physiological and psychological factors of dehydration have an impact on an athlete’s perceived performance. However, it is unclear whether the effects of psychological, physiological, or both have a negative impact on athletic performance caused by mild hypohydration. Purpose: The purpose of this study was to determine if mild hypohydration affects exercise performance in trained cyclists while blinding their hydration state. Methodology: Eleven competitive male cyclists participated in two blinded experimental trials, hypohydrated and euhydrated states by intra-venous infusions. The …

Influence Of Heat Stress On Pregnancy Rate Of Beef Cattle Heifers And Cows Using Ovsynch Plus Cidr Followed By Timed Artificial Insemination In Thailand, Jatuporn Kajaysri, Anuwat Wattananorasate

The Thai Journal of Veterinary Medicine

This study aimed to evaluate the pregnancy rate in beef cattle heifers and cows in Thailand under different heat stress conditions using the Ovsynch plus controlled internal drug release (CIDR) followed by timed artificial insemination (TAI) protocol. Eighty-one beef heifers and ninety-five postpartum cows were tested. These cattle were divided into three groups. Group 1 (29 heifers and 33 cows) was examined in winter, while Group 2 (25 heifers and 30 cows) and Group 3 (27 heifers and 32 cows) were examined in summer and rainy season, respectively. All cattle were treated with Ovsynch plus CIDR for 7 days followed …

Evaluation Of The Effects Of Formaldehyde On Growth Parameters Of Broiler Chicks, Paula Johnson

Graduate Theses and Dissertations

Formaldehyde has been used as a disinfectant in poultry hatching cabinets to aid in controlling key pathogenic organisms, such as Salmonella and Escherichia coli (E.coli). There is some evidence that prolonged exposure of chicks to formaldehyde can reduce tracheal ciliary function and thus reasons to believe that exposure to formaldehyde, in the absence of pathogen challenge, may reduce chick vitality. It has been found that elevated temperatures during incubation may adversely affect body weights of broiler chicks, as well as post-hatch environmental heat stress on performance in poultry. Post-hatch environmental heat stress has been shown to impact performance in poultry. …

Analyzing Indoor And Outdoor Heat Index Measurements In Kitchens, Allison Welch

USF Tampa Graduate Theses and Dissertations

Occupationally induced heat-related illnesses (HRI) can play a huge part in the lives of employees working within outdoor kitchens. According to the National Institute for Occupational Safety and Health [NIOSH] (2016), “exposure to heat can result in injuries, disease, reduced productivity and death”. When working in outdoor environments, it is important to limit exposure time of direct sun or heat as well as to stay properly hydrated. One way to ensure limited occupational heat exposure is by measuring the Heat Index of the worker's environmental conditions.

The purpose of this study is to determine whether there was a difference between …

The Hsp72 And Hsp90Α Mrna Responses To Hot Downhill Running Are Reduced Following A Prior Bout Of Hot Downhill Running, And Occur Concurrently Within Leukocytes And The Vastus Lateralis, James A. Tuttle, Bryna C.R. Chrismas, Oliver R. Gibson, James H. Barrington, David C. Hughes, Paul C. Castle, Alan J. Metcalfe, Adrian W. Midgley, Oliver Pearce, Chindu Kabir, Faizal Rayanmarakar, Sami Al-Ali, Mark P. Lewis, Lee Taylor

Research outputs 2014 to 2021

The leukocyte heat shock response (HSR) is used to determine individual's thermotolerance. The HSR and thermotolerance are enhanced following interventions such as preconditioning and/or acclimation/acclimatization. However, it is unclear whether the leukocyte HSR is an appropriate surrogate for the HSR in other tissues implicated within the pathophysiology of exertional heat illnesses (e.g., skeletal muscle), and whether an acute preconditioning strategy (e.g., downhill running) can improve subsequent thermotolerance. Physically active, non-heat acclimated participants were split into two groups to investigate the benefits of hot downhill running as preconditioning strategy. A hot preconditioning group (HPC; n = 6) completed two trials (HPC1 …

Sirt1 Activation Mediates Heat-Induced Survival Of Uvb Damaged Keratinocytes, Leslie Calapre, Elin S. Gray, Sandrine Kurdykowski, Anthony David, Pascal Descargues, Mel R. Ziman Dr

Research outputs 2014 to 2021

Background

Exposure to heat stress after UVB irradiation induces a reduction of apoptosis, resulting in survival of DNA damaged human keratinocytes. This heat-mediated evasion of apoptosis appears to be mediated by activation of SIRT1 and inactivation of p53 signalling. In this study, we assessed the role of SIRT1 in the inactivation of p53 signalling and impairment of DNA damage response in UVB plus heat exposed keratinocytes.

Results

Activation of SIRT1 after multiple UVB plus heat exposures resulted in increased p53 deacetylation at K382, which is known to affect its binding to specific target genes. Accordingly, we noted decreased apoptosis and …

Impacts Of Vitamin C And E Injections On Ovarian Structures And Fertility In Holstein Cows Under Heat Stress Conditions, Juan GonzáLez Maldonado, Raymundo Rangel Santos, Raymundo Rodriguez De Lara, Gustavo Ramirez Valverde

Turkish Journal of Veterinary & Animal Sciences

This study evaluated the effect of injecting vitamin C (VC) and E (VE) on size of the preovulatory follicle, volume of the corpus luteum, and pregnancy rates in Holstein cows under heat stress conditions (temperature humidity index > 74). Sixty-two cows were randomly assigned to one of four treatments: 1, control, n = 15: cows were not supplemented with vitamins; 2, VCG, n = 15: cows were simultaneously injected i.v. with 500 and s.c. with 2500 mg of VC before and after estrus; 3, VEG, n = 15: cows received an i.m. injection of 3000 IU of VE before estrus; 4, …

Effect Of Heat Stress On Reproductive Performance Of An Imported Dorper Ram: A Case Study In Thailand, Saritvich Panyaboriban, Junpen Suwimonteerabutr, Theerawat Swangchan-Uthai, Theerawat Tharasanit, Nawapen Phutikanit, Mongkol Techakumphu

The Thai Journal of Veterinary Medicine

The aim of this study was to observe the possible influence of seasonal and environmental conditions on ejaculated semen qualities and male reproductive traits in an imported ram under tropical conditions. A Dorper ram was imported from South Africa and raised in Nakhon Pathom province. Semen was collected monthly by an artificial vagina over a period of one year. Semen picture and other parameters were evaluated in each sample. Climatic data (temperature, relative humidity and day length) were provided by the Meteorological Department of the Ministry of Communications of Thailand. Results showed that semen characteristics (volume, concentration, mass motility, motility …

Circulating Metabolic And Reproductive Hormone Changes In Laying Hens Kept Under Various Heat-Combating Systems, Muhammad Safdar Anjum, Mansur Abdullah Sandhu, Zia Ur-Rahman, Anum Safdar

Turkish Journal of Veterinary & Animal Sciences

The objective of the present study was to observe the circulating metabolic, reproductive, and stress hormones in laying hen performance under different heat-combating systems (HCSs). A total of 500 White Leghorn pullets at 24 weeks of age were subjected to four HCSs, i.e. desert cooling (DC), water sprinkling (WS), time limit feeding (TLF), and ascorbic acid (AA) supplementation, at environmental temperatures from 32.30 to 40.80 °C with 76.40% relative humidity. Blood was collected before heat stress, at peak stress, and after heat stress to collect plasma. The results of the 24-week stress period showed significantly less circulating T3, T4, estrogen, …