An experimental study of heat tolerance of cattle

1956 ◽  
Vol 7 (5) ◽  
pp. 469 ◽  
Author(s):  
DF Dowling
Keyword(s):  
Experimental Study ◽  
Heat Stress ◽  
Heat Tolerance ◽  
Rectal Temperature ◽  
Tolerance Test ◽  
The Body ◽  
Normal Body Temperature ◽  
Factors Influencing ◽  
Major Factors ◽  
Temperature Responses

The ability of cattle to maintain a normal body temperature in a dry, hot, inland Australian environment is associated with their ability to dissipate excess heat from the body. A heat tolerance test, based on rectal temperature responses after exercise, is reported. This test indicates the animal's capacity to lose heat. Forty animals, classified on their coat covering, were included in the experiments described. The differences in coat covering are described and associated with differences in rectal temperature under various forms of heat stress. The results serve to illustrate the basic weaknesses of any field test (or hot-room test) which cannot be carried out under conditions where major factors influencing the "adaptability" and type of coat can be kept uniform for all animals tested.

scholarly journals Comparison of Rectal Temperature Responses During a Modified Heat Tolerance Test

2018 ◽  
Vol 50 (5S) ◽  
pp. 121
Author(s):  
Yuri Hosokawa ◽  
Kelsey M. Rynkiewicz ◽  
Luke N. Belval ◽  
Courteney L. Benjamin ◽  
Ryan M. Curtis ◽  
...  
Keyword(s):  
Heat Tolerance ◽  
Rectal Temperature ◽  
Tolerance Test ◽  
Temperature Responses

scholarly journals AYURVEDIC DIETARY CONCEPTS IN DIFFERENT AGE GROUP OF CHILDREN

2020 ◽  
pp. 84-86
Author(s):  
Shamama Firdaus ◽  
Sunil Topre ◽  
Nitin Mane
Keyword(s):  
Life Style ◽  
Dietary Habits ◽  
Age Groups ◽  
Healthy Person ◽  
The Body ◽  
Developmental Phase ◽  
Age Group ◽  
Factors Influencing ◽  
Healthy Nutrition ◽  
Major Factors

Ayurveda is a science of life, which mainly aims to promote and preserve the health of the individuals. In this techno and competitive era, life style and diet are major factors influencing the health of the individuals. Diet and dietary habits play important role in maintenance of health. Ayurveda, its main aim is to promote and preserve the health, strength and longevity of healthy person and to cure the disease. Ayurveda places special emphasis on Ahara and believes that healthy nutrition nourishes the Sharir, Mana, Atma. As Acharyas has described Ahara. Nidra, Brahmcharya are Tryoupsthambha (sub pillars) which support the body itself. Here Ahara has been placed first which shows that it is most important to maintain and sustain of life. Children are delicate and most sensitive and prone to the infectious diseases. They are miniature of adult. They are in Ajatvyajanawastha (developing stage). Psychologically they are innocent. Being in developmental phase, Ahara plays very important role in the life of children. So parents should be aware of dietetic components required by child in different age groups.

Improving sustainable cotton production through enhanced resilience to climate change using mutation breeding.

2021 ◽  
pp. 145-156
Author(s):  
Manzoor Hussain ◽  
Ljupcho Jankuloski ◽  
M. Habib-ur-Rahman ◽  
Massoud Malek ◽  
Md. Kamrul Islam ◽  
...  
Keyword(s):  
Climate Change ◽  
Heat Stress ◽  
Heat Tolerance ◽  
Mutation Breeding ◽  
Climatic Conditions ◽  
Cotton Production ◽  
Climate Conditions ◽  
Growing Seasons ◽  
Major Factors ◽  
High Yields

Abstract Cotton, being a leading commercial fibre crop, is grown on 20.5 million hectares in three major cotton-producing countries: China, India and Pakistan. Wide differences in yield per hectare exist among these countries and these are being aggravated by changing climate conditions, i.e. higher temperatures and significant seasonal and regional fluctuation in rainfall. Pakistan is one of the countries most affected by climate change. The disastrous effects of extreme periods of heat stress in cotton were very prominent in Pakistan during the growing seasons 2013-2014 (40-50% fruit abortion) and 2016-2017 (33% shortfall), which posed an alarming threat to the cotton-based economy of Pakistan. Poor resilience of the most commonly grown cotton varieties against extreme periods of heat stress are considered to be major factors for this drastic downfall in cotton production in Pakistan. Using the approach of induced mutation breeding, the Nuclear Institute for Agriculture and Biology (NIAB), Faisalabad, Pakistan, has demonstrated its capabilities in developing cotton mutants that can tolerate the changed climatic conditions and sustain high yields under contrasting environments. The results of studies on the phenological and physiological traits conferring heat tolerance are presented here for thermo-tolerant cotton mutants (NIAB-878, NIAB-545, NIAB-1048, NIAB-444, NIAB-1089, NIAB-1064, NIAB-1042) relative to FH-142 and FH-Lalazar. NIAB-878 excelled in heat tolerance by maintaining the highest anther dehiscence (82%) and minimum cell injury percentage (39%) along with maximum stomatal conductance (27.7 mmol CO2/m2/s), transpiration rate (6.89 μmol H2O/m2/s), net photosynthetic rate (44.6 mmol CO2/m2/s) and physiological water use efficiency (6.81 mmol CO2/μmol H2O) under the prevailing high temperatures.

Genetic variation of rectal temperature and its relationship to milk production in Holstein dairy cows

2009 ◽  
Vol 2009 ◽  
pp. 63-63
Author(s):  
S Khalajzade ◽  
N Emam Jomeh ◽  
A Salehi ◽  
A Moghimi Esfandabadi
Keyword(s):  
Heat Stress ◽  
Dairy Cows ◽  
Milk Production ◽  
Heat Tolerance ◽  
Rectal Temperature ◽  
Weather Factors ◽  
And Performance ◽  
Very High ◽  
Selection Of ◽  
Holstein Dairy Cows

Milk production is significantly decreased by thermal stress. The survival and performance of an animal during heat stress periods depend on several weather factors, especially temperature and humidity. Researchers reported dramatic decreases in milk production as temperature rose above 30 degree of centigrade. Very high environmental temperature is common during the summer months in Iran. Rectal temperature is as indicator of heat tolerance and has been the most frequently used physiological variable for estimating heat tolerance in cattle. Some dairy cows are more heat tolerant and productive when subjected to heat stress. Identification and selection of heat stress resistant cattle offers the potential to increase milk yield in tropical environment. The aim of the present study was to estimate genetic parameters of heat tolerance and its relationship to milk production in Holstein Dairy Cows in Iran.

scholarly journals Factors determining the marketing strategies of construction firms: construction professionals' perspective

2020 ◽  
Vol 11 (3) ◽  
pp. 1070
Author(s):  
Imoleayo Abraham Awodele ◽  
Adesoji Anthony Adegboyega ◽  
Onyinye Sofolahan ◽  
Abdullahi Adamu ◽  
Kenneth John Saidu
Keyword(s):  
Organizational Performance ◽  
Critical Role ◽  
Profit Maximization ◽  
Marketing Strategies ◽  
The Body ◽  
Item Score ◽  
Construction Firms ◽  
Factors Influencing ◽  
Construction Organizations ◽  
Major Factors

Construction firms are not dedicated to the comprehensive adoption of marketing concepts and strategy, and thus do not enjoy the benefits of profit maximization, client satisfaction and loyalty and improved overall organizational performance. The purpose of this paper is, to assess the perception of construction professionals regarding the factors influencing the choice of marketing strategies adopted by their construction firms. A questionnaire survey approach was used in the study. The questionnaires were administered to construction professionals within the study area, Frequency, Percentile, Mean item score and Kruskal-Wallis test were used to analyses the data collected. The study found that employees' competence, technical knowledge of the firm, macroeconomic environment, and innovation are the major factors that influence the choice of marketing strategy. It was concluded that a firm's employee's knowledge and competencies and technological innovation plays a critical role in the adoption of suitable marketing strategies in the construction industry. In addition, there is agreement among construction professionals regarding the factors influencing the choice of marketing strategies adopted by their firms. This study adds to the body of knowledge existing on marketing and marketing strategies in construction organizations in Nigeria.

Factors influencing Selection of Shelter by Individual Quokkas, Setonix brachyurus (Marsupialia), during Hot Summer Days on Rottnest Island

1981 ◽  
Vol 29 (6) ◽  
pp. 875 ◽  
Author(s):  
DJ Kitchener
Keyword(s):  
Heat Stress ◽  
Metabolic Rate ◽  
Rectal Temperature ◽  
Physical Condition ◽  
Physiological Response ◽  
Evaporative Water ◽  
Stress Indices ◽  
Factors Influencing ◽  
Hot Days ◽  
Selection Of

Individual adult quokkas in the field were studied in relation to their choice of shelter sites on hot summer days and to their physiological response to heat stress and physical condition. Metabolic rate, evaporative water loss and rectal temperature were measured under laboratory conditions. The extent to which male quokkas moved to better shelter on hot days is significantly and positively correlated with their metabolic rate at T*a 37�C; movement of females is significantly but negatively correlated with their rectal temperature. It is concluded that individual quokkas moving more frequently to better shelter on hot days (males) were physiologically less able to tolerate heat stress. Indices of physical condition and indicators of health and age were not correlated with movement. It is suggested that physiological variation in quokkas, both between and within sexes, effectively reduces intraspecific competition for a limiting resource (shelter). This expands their realised niche, increasing the carrying capacity of their environment.

The Heat Tolerance Test: An Efficient Screening Tool for Evaluating Susceptibility to Heat

2007 ◽  
Vol 16 (3) ◽  
pp. 215-221 ◽  
Author(s):  
Daniel S. Moran ◽  
Tomer Erlich ◽  
Yoram Epstein
Keyword(s):  
Heart Rate ◽  
Heat Stress ◽  
Heat Tolerance ◽  
Screening Tool ◽  
Sweat Rate ◽  
Tolerance Test ◽  
Climatic Chamber ◽  
Efficient Tool ◽  
Controlled Exposure ◽  
Efficient Screening

Context:Individuals in the population who are not able to sustain heat and whose body temperature will start rising earlier and at a higher rate than that of others, under the same conditions, are defined as “heat intolerant.”Objectives:The applicability of the heat tolerance test (HTT) in identifying individuals’ tolerance/intolerance to heat is presented.Setting:HTT is performed according to the following protocol: 120 minutes exposure to 40°C and 40% relative humidity in a climatic chamber while walking on a treadmill, dressed in shorts and T-shirt, at a pace of 5 km/h and 2% elevation. Rectal temperature and heart rate are continuously monitored, and sweat rate is calculated.Results and Conclusion:The HTT that is based on controlled exposure to an exercise-heat stress is an applicable and an efficient tool in differentiating between a temporary and permanent state of heat susceptibility.

scholarly journals Respons Fisiologis Ayam KUB (Kampung Unggul Balitbangtan) dan Ayam Walik dengan Haplotipe Gen HSP70 Berbeda yang Terpapar Cekaman Panas Akut

2021 ◽  
Vol 26 (2) ◽  
pp. 276-283
Author(s):  
Any Aryani ◽  
Dedy Duryadi Solihin ◽  
Cece Sumantri ◽  
Rudi Afnan ◽  
Tike Sartika
Keyword(s):  
Heat Stress ◽  
Surface Temperature ◽  
Infrared Thermography ◽  
Rectal Temperature ◽  
Body Surface ◽  
The Body ◽  
Stress Hormone ◽  
Acute Heat Stress ◽  
Body Surface Temperature ◽  
Head Neck

This study was conducted to determine the physiological response of acute heat stress in Kampung Unggul Balitbangtan (KUB) and Walik chickens with four different HSP70 gene haplotypes (H1', H1, H2, and H3). Acute heat stress is carried out at 35°C for one hour. The data was analyzed based on rectal temperature measurements, distribution of body surface temperature (head, neck, body, and leg area), hormone levels (corticosterone and triiodothyronine), and time of panting. Body surface temperature is detected using infrared thermography. The results showed that haplotype H1 Walik chicken is more susceptible to heat stress based on the rectal temperature. In contrast, H1' haplotype Walik chicken released more heat through the body surface in the leg area. Keywords: heat stress, hormone, KUB chicken, infrared thermography, walik chicken

Bos indicus and Bos taurus crossbred dairy cattle in Australia. III.* A climate room test of heat tolerance used in the selection of young sires for progeny testing

1974 ◽  
Vol 25 (6) ◽  
pp. 1023 ◽  
Author(s):  
TE Allen ◽  
SM Donegan
Keyword(s):  
Heat Tolerance ◽  
Rectal Temperature ◽  
Large Scale ◽  
Bos Indicus ◽  
Rank Correlation ◽  
Tolerance Test ◽  
Breeding Program ◽  
Progeny Testing ◽  
Stressful Environment ◽  
Rate Score

A heat tolerance test for cattle is described, and the results of its use over a 7 year period in a largescale breeding program are given. Animals were subjected to the test on up to three occasions, each test comprising 1 week in an anteroom at moderate temperature followed by 5 days in a climate room at high temperature. Measurements of sweating and respiratory rates, rectal temperature and feed and water consumption are given. The animals were ranked by means of a total score which was made up of the' sum of a sweating rate score and feed intake score less the sum of a rectal temperature score and respiratory rate score. A significant Spearman's rank correlation coefficient of 0.67 was obtained between the ranking of 44 heifers in two separate series of tests. Comparison of bulls from dams selected and unselected for milk production in a stressful climate showed the bulls from the selected dams to be superior in heat tolerance. In the large-scale breeding program, the test selected bulls with three-eighths or half Bos indicus blood in preference to those with quarter Bos indicus blood; and within the quarter-breds it selected those out of dams bred in herds located in a stressful environment in preference to similar crossbred bulls out of dams bred in a temperate environment.

scholarly journals Breed and seasonal variation in thermoregulatory paramters of some selected Nigerian indigenous cattle

2021 ◽  
Vol 47 (6) ◽  
pp. 18-31
Author(s):  
H. Y. Abbaya ◽  
I. I. Adedibu ◽  
M. Kabir ◽  
A. O. Iyiola-Tunji
Keyword(s):  
Heat Stress ◽  
Seasonal Variation ◽  
Respiratory Rate ◽  
Pulse Rate ◽  
Heat Tolerance ◽  
Rectal Temperature ◽  
Indigenous Cattle ◽  
Fréquence Cardiaque ◽  
Stress Thermique ◽  
Breed Differences

The study was conducted to evaluate breed differences in thermoregulatory parameters of four Nigerian indigenous breeds of cattle over two seasons (late rainy and late dry). Data on thermoregulatory parameters (rectal temperature, respiratory rate, pulse rate and Heat Tolerance Coefficient) of eighty (80) cattle, comprising 20 each of Bunaji, Rahaji, Bokoloji and Adamawa Gudali were obtained and subjected to analysis of variance of SAS software. In the pooled breed variation, breed influenced (p<0.05) all the parameters measured. Bunaji recorded the highest rectal temperature (37.92oC) in all the seasons of measurement. Respiratory rate and Heat tolerance coefficient were highest in Bokoloji while the least were in Bunaji and Adamawa Gudali. Season significantly (p<0.05) affected thermoregulatory parameters measured except (p>0.05) rectal temperature. The highest recorded values of respiratory rate (27.85 beat/min), Pulse rate (27.62breaths/min) and HTC (2.19) were in the late dry season. The effect of interaction between breed and season on thermoregulatory parameters significantly affected (p<0.05) all the thermoregulatory parameters measured. It was concluded that Bokoloji and Bunaji breeds of indigenous cattle are more reactive to Heat stress than Rahaji and Adamawa Gudali even though this could vary with seasons of the year as seen in the interaction between breed and season in this study.   L'étude a été menée pour évaluer les différences entre les races dans les paramètres thermorégulateurs de quatre races indigènes de bétail nigérianes sur deux saisons (pluvieuse tardive et sèche tardive). Des données sur les paramètres thermorégulateurs (température rectale, fréquence respiratoire, fréquence du pouls et coefficient de tolérance à la chaleur) de quatre-vingts (80) bovins, comprenant 20 de chacun de Bunaji, Rahaji, Bokoloji et Adamawa Gudali ont été obtenues et soumises à l'analyse de variance du logiciel 'SAS'. Dans la variation de race combinée, la race a influencé (p <0,05) tous les paramètres mesurés. Bunaji a enregistré la température rectale la plus élevée (37,920 ° C) de toutes les saisons de mesure. La fréquence respiratoire et le coefficient de tolérance à la chaleur étaient les plus élevés à Bokoloji tandis que les plus faibles étaient à Bunaji et à Adamawa Gudali. La saison a affecté significativement (p <0,05) les paramètres thermorégulateurs mesurés sauf (p> 0,05) la température rectale. Les valeurs les plus élevées enregistrées de la fréquence respiratoire étaient (27,85 battements / min), la fréquence cardiaque (27,62 respirations / min) et le 'HTC' (2,19) étaient à la fin de la saison sèche.L'effet de l'interaction entre la race et la saison sur les paramètres thermorégulateurs était significativement affecté (p <0,05) tous les paramètres thermorégulateurs mesurés. Il a été conclu que les races Bokoloji et Bunaji de bovins indigènes sont plus réactives au stress thermique que Rahaji et Adamawa Gudali, même si cela peut varier avec les saisons de l'année, comme le montre l'interaction entre la race et la saison dans cette étude.

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