scholarly journals Environmental source of stress in livestock productivity - a study of Minna climate data

2018 ◽  
Vol 34 (2) ◽  
pp. 159-170 ◽  
Author(s):  
Sikiru Babatunde ◽  
Egena Acheneje ◽  
Alemede Comfort ◽  
Makinde John
Keyword(s):  
Oxidative Stress ◽  
Heat Stress ◽  
Livestock Production ◽  
Mitigation Strategies ◽  
Climate Data ◽  
Stress Genes ◽  
Temperature Humidity Index ◽  
Humidity Index ◽  
Livestock Productivity ◽  
The Tropics

Stress emanating from environment is a factor limiting livestock productivity in the Tropics because of elevated temperature year round; hence this study took a look at Minna climate data for evaluation of Temperature-Humidity- Index (THI) as a way of identifying climate source of stress on livestock production. Climate Normals for Minna between years 1961 and 2018 were obtained, and the data were analyzed using general formulae for calculating Temperature-Humidity-Index for livestock production. Relationships between production parameters on commercial farms and the THI data indicated that heat stress is a potential cause of oxidative stress in the area. The THI showed that the environmental conditions in the study area has potential for heat stress on animals, and that it can aggravate oxidative stress in livestock under production in the study area, hence there is need for further studies to identify the pathophysiological mechanisms of heat stress so as to develop mitigation strategies for improved animal performance and productivity. The study suggested that instead of the penchant for importing exotic breeds of livestock with the aim of upgrading the indigenous breeds, the way forward could be the utilization of genetic expression of heat and oxidative stress genes in animals as candidate markers for improvement of their productive potentials.

scholarly journals Critical Temperature-Humidity Index Thresholds for Dry Cows in a Subtropical Climate

2021 ◽  
Vol 2 ◽  
Author(s):  
Véronique Ouellet ◽  
Izabella M. Toledo ◽  
Bethany Dado-Senn ◽  
Geoffrey E. Dahl ◽  
Jimena Laporta
Keyword(s):  
Heat Stress ◽  
Respiration Rate ◽  
Rectal Temperature ◽  
Dry Matter ◽  
Dry Matter Intake ◽  
Subtropical Climate ◽  
Dry Period ◽  
Environmental Indices ◽  
Temperature Humidity Index ◽  
Humidity Index

The effects of heat stress on dry cows are profound and significantly contribute to lower overall welfare, productivity, and profitability of the dairy sector. Although dry cows are more thermotolerant than lactating cows due to their non-lactating state, similar environmental thresholds are currently used to estimate the degree of heat strain and cooling requirements. Records of dry cow studies conducted over 5 years in Gainesville, Florida, USA were pooled and analyzed to determine environmental thresholds at which dry cows exhibit signs of heat stress in a subtropical climate. Dry-pregnant multiparous dams were actively cooled (CL; shade of a freestall barn, fans and water soakers, n = 107) or not (HT; shade only, n = 111) during the last 7 weeks of gestation, concurrent with the entire dry period. Heat stress environmental indices, including ambient temperature, relative humidity, and temperature-humidity index (THI), and animal-based indices, including respiration rate, rectal temperature and daily dry matter intake were recorded in all studies. Simple correlations were performed between temperature-humidity index and each animal-based indicator. Differences in respiration rate, rectal temperature and dry matter intake between treatments were analyzed by multiple regression. Using segmented regression, temperature-humidity thresholds for significant changes in animal-based indicators of heat stress were estimated. Stronger significant correlations were found between the temperature-humidity index and all animal-based indices measured in HT dry cows (−0.22 ≤ r ≤ 0.35) relative to CL dry cows (−0.13 ≤ r ≤ 0.19). Although exposed to similar temperature-humidity index, rectal temperature (+0.3°C; P < 0.001) and respiration rate (+23 breaths/min; P < 0.001) were elevated in HT dry cows compared with CL cows whereas dry matter intake (−0.4 kg of dry matter/d; P = 0.003) was reduced. Temperature-humidity index thresholds at which respiration rate and rectal temperature began to change were both determined at a THI of 77 in HT dry cows. No significant temperature-humidity threshold was detected for dry matter intake. At a practical level, our results demonstrate that dry cow respiration rate and rectal temperature increased abruptly at a THI of 77 when provided only shade and managed in a subtropical climate. Therefore, in the absence of active cooling, dry cows should be closely monitored when or before THI reaches 77 to avoid further heat-stress related impairments during the dry period and the subsequent lactation and to mitigate potential carry-over effects on the offspring.

scholarly journals Pengaruh Alih Fungsi Telajakan Depan Rumah Menjadi Artshop terhadap Kenyamanan dan Estetika Lansekap Desa Tegallalang

2015 ◽  
pp. 1
Author(s):  
I WAYAN PASEK HARIMBAWA ◽  
I MADE SUKEWIJAYA ◽  
NI WAYAN FEBRIANA UTAMI
Keyword(s):  
Aesthetic Quality ◽  
Human Comfort ◽  
Scenic Beauty ◽  
Comfort Index ◽  
Temperature Humidity Index ◽  
Humidity Index ◽  
The Aesthetic ◽  
The Tropics ◽  
The Way

ABSTRACT The Effect of Telajakan-Front Yard Conversion into an Artshop Toward Human Comfort Index and Landscape Aesthetic in Tegallalang Village Telajakan, a Balinese typical home yard, has located in front, right or left, or in the back of the yard. The study only focused on telajakan front yard along the way of Tegallalang Village which is usually used as a garden or planted area, although many of them turning into an artshop. The purpose of the study was to determine the effect of telajakan conversion into an artshop using user’s comfort index and landscape aesthetic measurement. Methods used in this study was temperature humidity index (THI) with the data of temperature and humidity. In addition, to assessed the aesthetic quality of the landscape used scenic beauty estimation (SBE) method by taking a photo of each landscape element representing the land use. Result showed that user’s comport index was low (THI valued ranged from 24,47 to 27,39) and categorized as uncomfortable to the tropics area. Further, the aesthetic quality resulted that the lowest SBE quality was -80,21 and highest SBE quality was 138,42. The aesthetic quality of the majoring landscape along the way of Tegallalang valued as a low category (53,33%), medium category (28,88%), and high category (17,77%). As a results, the conversion of telajakan into an artshop caused low of user’s comfort index and low of aesthetic quality to the landscape.   Keywords: comfort index, landscape aesthetics, telajakan, temperature humidity index (THI), scenic beauty estimation (SBE).

scholarly journals Effect of Temperature-Humidity-Index on Milk Performances of Local Born Holstein Dairy Cows Under Saharan Climate

2021 ◽  
Vol 24 (2) ◽  
pp. 24-36
Author(s):  
Lazoumi Ouarfli ◽  
Abdelmadjid Chehma
Keyword(s):  
Heat Stress ◽  
Dairy Cows ◽  
Environmental Conditions ◽  
Arid Regions ◽  
Effect Of Temperature ◽  
Significant Drop ◽  
Temperature Humidity Index ◽  
Lactation Length ◽  
Humidity Index ◽  
Milking Frequency

Abstract The objective is to study the effect of heat stress on milk yield (MY) relative to milking records (n=18178) of native Holsteins (n=187), in the region of Ghardaia, according to periods of HS, using the temperature-humidity index (THI). With THI >72 during 07 months in the study area, which significantly (P<0.001) decrease the MY (-15.5% corresponding to 21.73 kg). Also, calving periods led to a significant drop (P < 0.001) in overall MY (7030.35 kg) of the order of (-14.6%), and over the lactation length (353.43 d), which explains 41% of the variations in MY. In addition, the non-significant effect (P=0.212) of the lactation range on the increase in MY, moreover, the lactation length shows a non-significant (P = 0.108) decrease (-4.68%) during heat stress (HS). Furthermore, the significant effect (P <0.001) of the interaction (Milking frequency × THI) on MY, when THI variates from < 74 to > 84, with regression of (-16.82% and -08.82%) of the MF (2X and 3X), respectively. Again, the NH cow is less sensitive to hyperthermia, so THI explains only 2% of the variation in MY levels. Thus, NH in arid regions have the ability to acclimatize to Saharan environmental conditions.

scholarly journals Impact of climate change on livestock productivity: A review

2021 ◽  
Vol 48 (4) ◽  
pp. 149-164
Author(s):  
I. I. Madziga
Keyword(s):  
Climate Change ◽  
Heat Stress ◽  
Negative Impact ◽  
Livestock Production ◽  
Changement Climatique ◽  
Impact Of Climate Change ◽  
Stress Thermique ◽  
Temperature Radiation ◽  
Livestock Productivity

Climate change is a long-term shift in the statistics of the weather such as temperature,  radiation, and wind and rainfall characteristics of a particular region. Sustainability in  livestock production system is largely affected by climate change. A disproportion between  metabolic high temperature production inside the animal body and its dissipation to the  surroundings results to heat stress under high air temperature and humid climates. The  foremost reaction of animals under thermal weather is an increase in respiration rate, rectal  temperature and heart rate. The anticipated rise in temperature due to climate change is  likely to aggravate the heat stress in livestock, adversely affecting their productive and  reproductive performance and even death in extreme cases. The predicted negative impact of  climate change on agriculture would also adversely affect livestock production by  aggravating the feed and fodder shortages. The paper mainly reviews the impacts of climate  change on livestock productive performance.  Le changement climatique est un changement à long terme dans les statistiques  météorologiques telles que la température, le rayonnement et les caractéristiques du vent et  des précipitations d'une région particulière. La durabilité du système de production de bétail  est largement affectée par le changement climatique. Une disproportion entre la production  métabolique à haute température à l'intérieur du corps de l'animal et sa dissipation dans  l'environnement entraîne un stress thermique sous des températures élevées de l'air et des  climats humides. La réaction la plus importante des animaux sous temps thermique est une  augmentation de la fréquence respiratoire, de la température rectale et de la fréquence  cardiaque. L'augmentation prévue de la température due au changement climatique est  susceptible d'aggraver le stress thermique du bétail, affectant négativement ses  performances productives et reproductives et même la mort dans les cas extrêmes. L'impact  négatif prévu du changement climatique sur l'agriculture aurait également un effet négatif  sur la production animale en aggravant les pénuries d'aliments et de fourrage. Le document  passe principalement en revue les impacts du changement climatique sur les performances  de production de bétail. 

Shade access in combination with sprinkling and ventilation effects performance of Holstein cows in early and late lactation

2019 ◽  
Vol 59 (2) ◽  
pp. 347 ◽  
Author(s):  
Lorena Román ◽  
Celmira Saravia ◽  
Laura Astigarraga ◽  
Oscar Bentancur ◽  
Alejandro La Manna
Keyword(s):  
Heat Stress ◽  
Block Design ◽  
Mitigation Strategies ◽  
Holstein Cows ◽  
Stress Effect ◽  
Early Lactation ◽  
Stress Effects ◽  
Negative Effect ◽  
Humidity Index ◽  
Two Stages

The negative effect of heat stress on dairy cows, with a temperature humidity index (THI) over 72, has been extensively studied. However, there are few studies on THI values under 72 that compare the effect of heat stress in different lactation stages. The objective of this study was to determine the heat stress effect on two lactation stages with a THI below the threshold 72. Thirty-nine multiparous, non-pregnant Holstein cows with more than 30 kg/cow.day of solid-corrected milk were used in a randomised complete block design to evaluate six treatments. The experimental design had a 3 by 2 factorial arrangement with three heat stress mitigation strategies: No shade (CON), access to shade only, and access to shade combined with sprinkling and ventilation, and two stages of lactation: early (S1) and late (S2), 12 ± 10.3 and 201 ± 45.8 days in milk respectively, for a duration of 81 consecutive days. All treatments, except CON had access to artificial shade from 0900 hours to 0500 hours next day. From 0500 hours to 0900 hours all cows were managed together in a grazing session. Additionally, sprinkling and ventilation cows had two 30-min sessions of ventilation and spray (0900 hours, 1530 hours). The average THI was 70.1 ± 4.46 (minimum THI: 60.4; maximum THI: 81.7) and the average hours above 72 were 7.8 ± 5.98. Animals in S1 presented higher solids-corrected milk reduction (P &lt; 0.0001; 5.4 and 1.9 kg/cow.day), and protein yield (&lt;0.0001; 0.13 and 0.54 kg/cow.day) than animals in S2 when shade was not allowed (CON). It was concluded that under these conditions, animal productivity is more negatively affected in early lactation animals. The use of shade with or without spray and ventilation mitigates heat stress effects on both stages of lactation.

scholarly journals What is the best temperature-humidity index equation to indicate heat stress in crossbred dairy calves in a tropical environment?

2019 ◽  
Vol 49 (1) ◽  
Author(s):  
Fernanda Gatti de Oliveira Nascimento ◽  
Hellen Cris Pinto Aguiar ◽  
Gustavo Moya Rodrigues ◽  
Ednaldo Carvalho Guimarães ◽  
Mara Regina Bueno de Mattos Nascimento
Keyword(s):  
Heat Stress ◽  
Dew Point ◽  
Tropical Environment ◽  
Dairy Calves ◽  
Sensible Heat ◽  
Dew Point Temperature ◽  
Physiological Variables ◽  
Temperature Humidity Index ◽  
Humidity Index ◽  
The One

ABSTRACT: The aim of this study was to determine among nine temperature-humidity index (THI) equations, the one that best represents the effects of heat stress on crossbred dairy calves reared in a tropical environment. Twelve male and female calves, aged 20 to 60 days, and raised in a tropical pen were evaluated. Respiratory (RR) and heart rates (HR), rectal (RT), body surface (BST), dry bulb (Tdb) and wet bulb (Tbw) temperatures, partial vapor pressure (Pv), relative humidity (RH) and dew point temperature (Tpo) were quantified in the morning and afternoon. Nine THI equations were calculated. The highest correlation between physiological variables and this was used to select the best THI equation. Averages for nine THI equations, Tdb, Twb, Pv, Tdp, RR, HR, RT, and BST were higher in the afternoon than in the morning, whereas that for RH was the opposite. The highest values for RT occurred at temperatures above 26.4°C and when humidity was below 55.5%. The Tdb and Pv correlations with RR (0.697 and 0.707), RT (0.703 and 0.706) and BST (0.818 and 0.817) were significant and positive, whereas the RH correlations with the same physiological variables were significant and negative (-0.622, -0.590 and -0.638, respectively). The best index was the THI sensible heat-based ( T H I = 3.43 + 1.058 x T d b - 0.293 x R H + 0.0164 x T d b x R H + 35.7), which was significantly correlated with RR (r=0.668 and r²=0.446), HR (r=0.259 and r²=0.067), RT (r=0.693 and r²=0.479) and BST (r=0.807 and r²=0.650). In conclusion, the THI sensible heat-based equation best represents the effects of heat stress on crossbred dairy calves reared in a tropical environment.

Reassessment of temperature-humidity index for measuring heat stress in crossbred dairy cattle of a sub-tropical region

2019 ◽  
Vol 82 ◽  
pp. 99-106 ◽  
Author(s):  
Rakhshan Jeelani ◽  
Dipanjali Konwar ◽  
Asma Khan ◽  
Dhirendra Kumar ◽  
Dibyendu Chakraborty ◽  
...  
Keyword(s):  
Heat Stress ◽  
Dairy Cattle ◽  
Tropical Region ◽  
Temperature Humidity Index ◽  
Humidity Index ◽  
Crossbred Dairy Cattle

scholarly journals Improved reproductive performance achieved in tropical dairy cows by dietary beta-carotene supplementation

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Soparak Khemarach ◽  
Saowaluck Yammuen-art ◽  
Veerasak Punyapornwithaya ◽  
Sutichai Nithithanasilp ◽  
Narongrit Jaipolsaen ◽  
...  
Keyword(s):  
Oxidative Stress ◽  
Heat Stress ◽  
Reproductive Performance ◽  
Artificial Insemination ◽  
Proportional Hazards ◽  
Beta Carotene ◽  
Experimental Period ◽  
Control Treatment ◽  
Beneficial Effects ◽  
Humidity Index

AbstractDairy farming in tropical climates is challenging as heat stress can impair reproduction in cows. Previous studies have demonstrated the beneficial effects of beta-carotene supplementation on bovine reproductive performance. This study was performed in Thailand, where the temperature-humidity index (THI) during the experimental periods was measured to range from 78.4 to 86.1. Lactating Holstein cows classified as repeat breeders (previous artificial insemination [AI] failures) were randomly assigned into two treatments, control treatment (T1; received placebo, n = 200) and test treatment (T2; received 400 mg/h/day of beta-carotene, n = 200). All cows were subjected to a protocol for synchronization of ovulation and timed artificial insemination (TAI). The day of the 1st ovulation synchronized protocol was defined as day 0, and the total experimental period was 160 days. Daily placebo or beta-carotene supplements were given orally on day 0 and each subsequent day of the experiment. Diagnosis of pregnancy was performed using ultrasound on day 30 after insemination. Non-pregnant cows were subjected to further ovulation synchronizations (maximum of four) and TAI over a period of 160 days. Milk samples were collected every ten days throughout the experiment. The samples were analyzed for beta-carotene concentration, superoxide dismutase (SOD) and glutathione peroxidase (GPx) activities. The pregnancies per AI of the cows in T2 were significantly greater than that of T1 from the 2nd to 4th TAI. During the entire experimental period, the pregnancies in T2 were significantly greater than that of T1. Cox's proportional hazards regression model data indicated a 44% greater probability of pregnancy for cows receiving beta-carotene. The concentrations of milk beta-carotene in T2 were significantly greater than T1 from the 2nd to 4th TAI. Significantly greater SOD and GPx activities were observed in T2 than T1, suggesting a reduction of oxidative stress in cows treated with beta-carotene. Dietary supplementation with beta-carotene thus improves the reproductive performance of repeat breeders exposed to heat stress, possibly by reducing oxidative stress.

scholarly journals The Impact of Anthropogenic Climate Change on Egyptian Livestock Production

Animals ◽  
2021 ◽  
Vol 11 (11) ◽  
pp. 3127
Author(s):  
Amira A. Goma ◽  
Clive J. C. Phillips
Keyword(s):  
Climate Change ◽  
Heat Stress ◽  
Milk Production ◽  
Human Population ◽  
Production Systems ◽  
Livestock Production ◽  
Mitigation Strategies ◽  
Animal Products ◽  
Alternative Scenarios ◽  
The Impact

Egypt is one of the hottest countries in the world, and extreme climate events are becoming more frequent, which is consistent with the warming of the planet. The impact of this warming on ecosystems is severe, including on livestock production systems. Under Egyptian conditions, livestock already suffer heat stress periods in summer. The predicted increases in temperature as result of climate change will affect livestock production by reducing growth and milk production because of appetite suppression and conception rate reductions and will increase animal welfare concerns. In severe cases, these effects can result in death. We review the heat stress effects on livestock behaviour, reproduction, and production in the context of predicted climate change for Egypt over the course of this century and offer alternative scenarios to achieve food security for a growing human population. As an example, we combine predictions for reduced milk production during heat stress and human population trajectories to predict that milk availability per person will decline from 61 kg/year in 2011 to 26 kg/year in 2064. Mitigation strategies are discussed and include the substitution of animal-based foods for plant-based foods and laboratory-grown animal products.

Sign in / Sign up

Export Citation Format

Share Document