scholarly journals The effect of air temperature, velocity and humidity on respiration rate and rectal temperature as an expression of heat stress in gestating sows

2021 ◽  
pp. 103142
Author(s):  
P. Brandt ◽  
B. Bjerg ◽  
P. Pedersen ◽  
K.B. Sørensen ◽  
L. Rong ◽  
...  
Keyword(s):  
Heat Stress ◽  
Respiration Rate ◽  
Air Temperature ◽  
Rectal Temperature

scholarly journals Effects of cooled floor pads combined with chilled drinking water on behavior and performance of lactating sows under heat stress

2021 ◽  
Vol 99 (3) ◽  
Author(s):  
Y Zhu ◽  
L J Johnston ◽  
M H Reese ◽  
E S Buchanan ◽  
J E Tallaksen ◽  
...  
Keyword(s):  
Drinking Water ◽  
Heat Stress ◽  
Respiration Rate ◽  
Rectal Temperature ◽  
Time Budget ◽  
Video Recording ◽  
Lactating Sows ◽  
Before And After ◽  
And Performance ◽  
Drinking Frequency

Abstract This study was conducted to evaluate whether cooled floor pads combined with chilled drinking water could alleviate negative impacts of heat stress on lactating sows. Thirty sows (Landrace × Yorkshire, Parity = 1 to 6) were housed in individual farrowing stalls in two rooms with temperatures being controlled at 29.4°C (0700–1900 hours) and 23.9°C (1900–0700 hours). Sows in one room (Cool), but not in the other room (Control) were provided cooled floor pads (21–22°C) and chilled drinking water (13–15°C). Behavior of sows (15 sows/treatment) was video recorded during farrowing, and days 1, 3, 7, 14, and 21 after farrowing. Videos were viewed continuously to register the birth time of each piglet, from which total farrowing duration and birth intervals were calculated. The number of drinking bouts and the duration of each drinking bout were registered for each sow through viewing videos continuously for 2 h (1530–1730 hours) each video-recording day. Postures (lying laterally, lying ventrally, sitting, and standing) were recorded by scanning video recordings at 5-min intervals for 24 h each video-recording day, and time budget for each posture was calculated. Rectal temperature and respiration rate were measured for all sows the day before and after farrowing, and then once weekly. Sow and litter performance was recorded. Data were analyzed using the Glimmix procedure of SAS. The cooling treatment did not affect sow behavior or litter performance. Sows in the Cool room had lower rectal temperature (P = 0.03) and lower respiration rate (P < 0.001), consumed more feed (P = 0.03), tended to have reduced weight loss (P = 0.07), and backfat loss (P = 0.07) during lactation than sows in the Control room. As lactation progressed, sows increased drinking frequency (P < 0.001) and time spent lying ventrally (P < 0.0001), standing (P < 0.001), and sitting (P < 0.0001), and decreased time spent lying laterally (P < 0.0001) in both Cool and Control rooms. While cooled floor pads combined with chilled drinking water did not affect sow behavior, they did alleviate heat stress partially, as indicated by decreased rectal temperature, respiration rate, weight, and backfat loss, and increased feed intake in lactating sows.

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.

EFFECTS OF LOW FLUCTUATING TEMPERATURES ON FARM ANIMALS: I. INFLUENCE OF AMBIENT AIR TEMPERATURE ON THE RESPIRATION RATE, HEART RATE, AND RECTAL TEMPERATURE OF LACTATING HOLSTEIN-FRIESIAN COWS

1958 ◽  
Vol 38 (1) ◽  
pp. 10-22 ◽  
Author(s):  
M. A. MacDonald ◽  
J. M. Bell
Keyword(s):  
Heart Rate ◽  
Respiration Rate ◽  
Air Temperature ◽  
Rectal Temperature ◽  
Ambient Air ◽  
Farm Animals ◽  
Measurement Unit ◽  
Ambient Air Temperature ◽  
Air Temperatures ◽  
Holstein Friesian

This report presents data on the effect of low fluctuating ambient air temperatures on the rectal temperature, heart rate, and respiration rate in lactating Holstein-Friesian cows.Daily minimum ambient air temperature (DMAAT) inside the uninsulated University of Saskatchewan loose-housing shed ranged from −5° F. to 38° F. As ambient temperature decreased, rectal temperature and heart rate increased, while respiration rate decreased. Levels of significance were 10, 9, and 1 per cent for regressions of rectal temperature, heart rate, and respiration rate, respectively, on DMAAT. Levels of significance were 7, 10, and 1 per cent for regressions of rectal temperature, heart rate, and respiration rate, respectively, on degree hours per day (d-h/day). Degree hours per day is a measurement unit developed by the authors and is based on time and difference in degrees from 50° F.Change in rectal temperature and heart rate were not significantly (P = >.05) correlated with either change in d-h/day or change in DMAAT. Change in respiration rate was significantly (P = <.02) and negatively correlated with change in d-h/day and significantly (P = <.06) and positively correlated with change in DMAAT.Heart rate, rectal temperature, and respiration rate were not significantly correlated with each other. However, change in respiration rate was positively correlated with change in rectal temperature (P = <.03).While the influence of low temperatures resulted in small changes in these physiological characteristics compared to those experienced elsewhere in high temperature zones, it cannot be concluded that lactating cows were entirely free of thermal stress at temperatures as low as 0° F.

scholarly journals Effects of chromium supplementation on physiology, feed intake, and insulin related metabolism in growing pigs subjected to heat stress

2017 ◽  
Vol 1 (1) ◽  
pp. 116-125 ◽  
Author(s):  
F. Liu ◽  
J. J. Cottrell ◽  
U. Wijesiriwardana ◽  
F. W. Kelly ◽  
S. S. Chauhan ◽  
...  
Keyword(s):  
Heat Stress ◽  
Insulin Sensitivity ◽  
Respiration Rate ◽  
Rectal Temperature ◽  
Feed Intake ◽  
Insulin Response ◽  
Thermal Exposure ◽  
Growing Pigs ◽  
Model Assessment ◽  
Intravenous Glucose

Abstract Improving insulin sensitivity may reduce impacts of heat stress (HS) in pigs by facilitating heat dissipation. Chromium (Cr) has been reported to improve insulin sensitivity in pigs. Therefore, the aim of this experiment was to investigate whether Cr supplementation can mitigate HS in growing pigs. Thirty-six gilts were randomly assigned to 2 diets containing 0 (control) or 400 ppb Cr. After 14 d the supplemented pigs were allocated to either 8 d thermoneutral (20°C constant; TN) or cyclic HS (35°C, 0900 h to 1700 h) conditions and continued their respective diet (n = 9 per group). Growth performance was recorded during the 14-d supplementation period. The physiological responses to HS were monitored by measuring respiration rate, rectal temperature, blood gas chemistry, and feed intake during thermal exposure. Kinetics of plasma glucose, insulin and NEFA were studied by intravenous glucose tolerance test (IVGTT) on d 8 of thermal treatment. Results showed Cr alleviated the HS-increased rectal temperature (P &lt; 0.05) and respiration rate (P &lt; 0.01) at 1300 h and 1600 h during thermal exposure. However, Cr did not mitigate the reduction in average daily feed intake which was reduced by 35% during HS or the HS-induced respiratory alkalosis. Chromium tended to increase average daily gain (0.86 vs. 0.95 kg, P = 0.070) during the 14-d supplementation under TN conditions before thermal exposure, which might be associated with the potential of Cr in improving overall insulin sensitivity, as evidenced by a reduced insulin resistance index calculated by Homeostatic Model Assessment (HOMA-IR; 0.65 vs. 0.51, P = 0.013) and a tendency of reduced fasting plasma insulin concentration (1.97 vs. 1.67 μU/mL, P = 0.094). Heat stress decreased the acute insulin releasing rate (P = 0.012) and consequently slowed glucose clearance rate (P = 0.035) during IVGTT. Besides, HS enlarged the values of area under the curve of NEFA during IVGTT (P &lt; 0.01), indicating a reduced lipid mobilization. In conclusion, HS reduced insulin response to IVGTT. Chromium supplementation exhibited a potential in improving insulin sensitivity and mitigating HS symptoms in growing pigs.

scholarly journals RESPONS FISIOLOGIS DAN KETAHANAN PANAS KAMBING BOERAWA DAN PERANAKAN ETTAWA PADA MODIFIKASI IKLIM MIKRO KANDANG MELALUI PENGKABUTAN

2019 ◽  
Vol 7 (1) ◽  
pp. 206
Author(s):  
Arif Qisthon ◽  
Madi Hartono
Keyword(s):  
Heart Rate ◽  
Respiration Rate ◽  
Air Temperature ◽  
Rectal Temperature ◽  
Physiological Responses ◽  
Goat Breed ◽  
Randomized Design ◽  
Humidity Index ◽  
Hot Environments ◽  
Microclimate Conditions

This research aimed to study the effect of microclimate modification of pensby misting and the goats breeds (Boer and Ettawa crossbreeds) on physiological responses to adapt to the hot  environments. The study was conducted from August-September 2018 at the UPTD Goat Breeding Center, Lampung Plantation and Livestock Service Office located in Negeri Sakti, Pesawaran Regency. The study used a split plot design in completely randomized design. Two treatments were applied in this study, namely modification of the pen consisting of pens without misting and pens with misting and the goat breed namely Boerawa and Ettawa crossbreed (PE). Twelve female goats were used in this study, each of six Boerawa and PE respectively. The parameters observed were microclimate conditions, namely air temperature,relative humidity, and Temperature Humidity Index (THI) and physiological responses consisted of respiration rate, heart rate, rectal temperature, and Heat Tolerance Coefficient (HTC). The results showed that there was no effect of the interaction between the treatment of misting and the breeds of goat on respiration rate, heart rate, rectal temperature, and HTC. Misting can improve air temperature, THI, respiration rate and HTC, on the other hand, does not affect the heart rate and rectal temperature. Goat breed has no effect on all physiological responses. Thus, modification of the microclimate by misting effectively maintains body temperature under normal conditions and increases the adaptability of goats to hot environments. Keywords: Physiological Responses, Microclimate Conditions, Microclimate Modification, Misting

scholarly journals COMPARISON OF DIFFERENT HOUSING SYSTEMS FOR COWS DURING HEAT STRESS

2021 ◽  
pp. 78-91
Author(s):  
O. O. Borshch ◽  
O. V. Borshch
Keyword(s):  
Heat Stress ◽  
Respiratory Rate ◽  
Respiration Rate ◽  
High Temperatures ◽  
Air Temperature ◽  
Heat Load ◽  
Stress Index ◽  
Maximum Temperature ◽  
Housing Systems ◽  
Ventilation Systems

The work aimed to study the effect of high temperatures on the comfort of keeping Holstein cows with different options for loose housing. The study of the effect of high temperatures on the comfort of keeping cows was carried out in the period from 02.07–12.07 2018 in the Kyiv region. Three farms were selected with loose cow housing systems and various options for the level of animal comfort. The first option is loose housing in an easy-to-collect room. The second option is loose keeping in an easily collectible room with fans and a water irrigation system. The third option is for walking and feeding grounds with sheds. During the daily observation period, the main indicators of the microclimate in the recreation area (air temperature, relative humidity, wind speed), respiration rate, assessment of the severity of respiration and heat load indices were determined. The best performance among the studied housing technologies was recorded on a farm using irrigation and ventilation systems. During the period of the highest heat stress (12.00–16.00 h), the air temperature (Т) did not exceed 29.05±0.50 °С, the respiratory rate – 77.0±1.33 times/mins, the environmental stress index (ESI) – 39.07±0.14 °С, the heat load index (HLI) – 73.56±2.48. The lowest indices of the comfort of keeping were in an easily assembled room: T – 31.1±2.24 °C, respiratory rate – 82.0±1.80 times/min, ESI – 41.62±0.17 °C, HLI – 77.88±0.64. Intermediate indicators were for the content on the stern area: T – 30.3±2.31 °C, respiratory rate – 76.0±1.82 times/mins, ESI – 41.62±0.17 °C, HLI – 77.42±0.51. In all options for keeping cows, an increase in temperature to an average daily +27.7 °C became a significant stress factor that significantly influenced the dynamics of the respiration rate, the assessment of the severity of respiration, the value of ESI and HLI. It was found that for keeping cows in buildings using irrigation and ventilation systems, as well as on walking grounds, the indicators of the temperature-humidity index (THI), frequency and severity of respiration during the period of maximum temperature load (12.00–16.00 h) were lower than those for keeping in an easily assembled room.

scholarly journals Predicting rectal temperature and respiration rate responses in lactating dairy cows exposed to heat stress

2020 ◽  
Vol 103 (6) ◽  
pp. 5466-5484 ◽  
Author(s):  
Gan Li ◽  
Siyu Chen ◽  
Jian Chen ◽  
Dandan Peng ◽  
Xianhong Gu
Keyword(s):  
Heat Stress ◽  
Dairy Cows ◽  
Respiration Rate ◽  
Rectal Temperature ◽  
Lactating Dairy Cows

scholarly journals Mitigating heat stress of dairy cows bred in a free-stall barn by sprinkler systems coupled with forced ventilation

2017 ◽  
Vol 48 ◽  
Author(s):  
Alessandro D'Emilio ◽  
Simona M.C. Porto ◽  
Giovanni Cascone ◽  
Marco Bella ◽  
Marco Gulino
Keyword(s):  
Heat Stress ◽  
Treatment Group ◽  
Dairy Cows ◽  
Respiration Rate ◽  
Rectal Temperature ◽  
Sprinkler System ◽  
Climatic Conditions ◽  
Control Group ◽  
Forced Ventilation ◽  
Cooling Systems

This paper presents the results of a research study which had the objective of investigating the effect of a sprinkler system coupled with forced ventilation on the heat stress of dairy cows bred in a free stall barn without paddock. To this aim, an experiment was carried out inside a free-stall dairy house equipped with two different cooling systems: a fogging system associated with forced ventilation in the resting area and a sprinkler system associated with forced ventilation in the feeding alley. The experiment regarded two adjacent pens of the barn and was constituted by three different trials carried out in the following periods: 27th June – 7th July (P1), 25th July – 4th August (P2), 24th August – 3rd September (P3). The experimental protocol of each trial required that the treatment group was housed in one pen where the two cooling systems were always activated following an established timetable, whereas the control group was housed in the other pen, where the sprinkler system associated with forced ventilation was always deactivated. Climatic parameters were measured inside each pen of the barn and outside. Then, thermal humidity index (THI) was calculated. Rectal temperature and respiration rate of a sample of dairy cows were monitored each day during the three periods considered (P1, P2 and P3). During the three trials the cows of both groups were subjected to climatic conditions that resulted in average daily THI values between 72.8 and 74.7, corresponding to mild or moderate heat stress. However, during daytime, air temperature and relative humidity reached values corresponding to a severe heat stress, as attested by the maximum THI values that were higher than or very close to 80. Furthermore, it was observed that the sprinklers do not influence the microclimatic conditions. However, the physiological parameters values of the treatment group were always significantly lower than the corresponding ones of the control group. Specifically, the system especially influenced the respiration rate that, in the treatment group, was close to 50 breath/min, while in the control group it reached 70 breath/min. The sprinkler system had more limited effects on rectal temperature that, however, in the treatment group was significantly lower than in the control group (38.7°C to 38.8°C vs 39.1°C 39.4°C) in all the three periods of the experiment. These results show that the sprinkler system could be useful to mitigate heat stress in dairy cows.

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