The influence of heat stress on metabolic status of cows
It is considered that high air temperature and humidity during the summer are the main factors which adversely affect both the health and production-reproductive performance of high yielding dairy cows. The resulting heath stress leads to a series of changes in endocrine regulation of ho...
| Main Authors: | , , , |
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| Format: | Article |
| Language: | English |
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Faculty of Veterinary Medicine, Belgrade
2014-01-01
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| Series: | Veterinarski Glasnik |
| Subjects: | |
| Online Access: | http://www.doiserbia.nb.rs/img/doi/0350-2457/2014/0350-24571404141H.pdf |
| _version_ | 1819294643070697472 |
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| author | Horvat Jožef Šamanc Horea Kirovski Danijela Vujanac Ivan |
| author_facet | Horvat Jožef Šamanc Horea Kirovski Danijela Vujanac Ivan |
| author_sort | Horvat Jožef |
| collection | DOAJ |
| description | It is considered that high air temperature and humidity during the summer are
the main factors which adversely affect both the health and
production-reproductive performance of high yielding dairy cows. The
resulting heath stress leads to a series of changes in endocrine regulation
of homeostasis. The changes in hormonal status reflect in some way to the
indicators of metabolic status of the cows. The objective of this work was
to investigate the influence of heat stress on metabolic status of cows. The
experiment was carried out on 20 cows of Holstein-Friesian breed during the
summer, in the period from 18th to 45th day of lactation. During the
performance of the experiment, the value of heat index (THI) was determined
hourly and then the value of average morning (from 10 pm the previous day to
9 am the current day), afternoon (from 10 am to 9 pm the current day) and
all-day THI was calculated. Blood sampling was carried out on the 1st, 2nd,
8th, 11th, 14th, 18th, 25th, 29th and 37th day of the experiment, in the
morning and the afternoon. On the basis of hourly THI values, whole
experimental period was divided into three periods: period A during which
the cows were exposed to a extreme high heat stress (THI≥78) at least 7
hours in 24 hours; period B during which the cows were exposed to a moderate
heat stress (72≥THI≤78) at least 7 hours in 24 hours; period C during which
the cows were not exposed to a heat stress (THI≤72) in 24 hours. The average
daily THI in period A (73,25±0,89) was significantly higher (p<0,01,
individually) in regard to period B (71,45±0,96) and period C (65,41±2,09).
THI was significantly higher in the period B than in the period C (p<0,01).
Significantly lower blood glucose value (p<0,05) during the afternoon period
in the cows exposed to the extreme heat stress (3,02±0,31 mmol/L) in regard
to the morning period (3,14±0,41 mmol/L) points to the fact that in such
conditions, metabolism redirects to use of glucose as an energy source
because in that way less thermal energy is produced than during
decomposition of fatty acids. Concentration of most important metabolic
profile parameters in blood (cholesterol, triglycerides, total proteins,
albumin, urea, total bilirubin, calcium, inorganic phosphorus as well as AST
and ALT activity) did not vary significantly under the influence of heat
stress. The exception was ionic calcium concentration which, under the
conditions of extreme heat stress, was on the lower limit of physiological
values (1.17±0.16 mmol/L). |
| first_indexed | 2024-12-24T04:29:35Z |
| format | Article |
| id | doaj.art-4bf3426e1d284b21b52760a07e1c2be0 |
| institution | Directory Open Access Journal |
| issn | 0350-2457 2406-0771 |
| language | English |
| last_indexed | 2024-12-24T04:29:35Z |
| publishDate | 2014-01-01 |
| publisher | Faculty of Veterinary Medicine, Belgrade |
| record_format | Article |
| series | Veterinarski Glasnik |
| spelling | doaj.art-4bf3426e1d284b21b52760a07e1c2be02022-12-21T17:15:28ZengFaculty of Veterinary Medicine, BelgradeVeterinarski Glasnik0350-24572406-07712014-01-01683-414115010.2298/VETGL1404141H0350-24571404141HThe influence of heat stress on metabolic status of cowsHorvat Jožef0Šamanc Horea1Kirovski Danijela2Vujanac Ivan3Veterinarski specijalistički institut Subotica, SuboticaFakultet veterinarske medicine, BeogradFakultet veterinarske medicine, BeogradFakultet veterinarske medicine, BeogradIt is considered that high air temperature and humidity during the summer are the main factors which adversely affect both the health and production-reproductive performance of high yielding dairy cows. The resulting heath stress leads to a series of changes in endocrine regulation of homeostasis. The changes in hormonal status reflect in some way to the indicators of metabolic status of the cows. The objective of this work was to investigate the influence of heat stress on metabolic status of cows. The experiment was carried out on 20 cows of Holstein-Friesian breed during the summer, in the period from 18th to 45th day of lactation. During the performance of the experiment, the value of heat index (THI) was determined hourly and then the value of average morning (from 10 pm the previous day to 9 am the current day), afternoon (from 10 am to 9 pm the current day) and all-day THI was calculated. Blood sampling was carried out on the 1st, 2nd, 8th, 11th, 14th, 18th, 25th, 29th and 37th day of the experiment, in the morning and the afternoon. On the basis of hourly THI values, whole experimental period was divided into three periods: period A during which the cows were exposed to a extreme high heat stress (THI≥78) at least 7 hours in 24 hours; period B during which the cows were exposed to a moderate heat stress (72≥THI≤78) at least 7 hours in 24 hours; period C during which the cows were not exposed to a heat stress (THI≤72) in 24 hours. The average daily THI in period A (73,25±0,89) was significantly higher (p<0,01, individually) in regard to period B (71,45±0,96) and period C (65,41±2,09). THI was significantly higher in the period B than in the period C (p<0,01). Significantly lower blood glucose value (p<0,05) during the afternoon period in the cows exposed to the extreme heat stress (3,02±0,31 mmol/L) in regard to the morning period (3,14±0,41 mmol/L) points to the fact that in such conditions, metabolism redirects to use of glucose as an energy source because in that way less thermal energy is produced than during decomposition of fatty acids. Concentration of most important metabolic profile parameters in blood (cholesterol, triglycerides, total proteins, albumin, urea, total bilirubin, calcium, inorganic phosphorus as well as AST and ALT activity) did not vary significantly under the influence of heat stress. The exception was ionic calcium concentration which, under the conditions of extreme heat stress, was on the lower limit of physiological values (1.17±0.16 mmol/L).http://www.doiserbia.nb.rs/img/doi/0350-2457/2014/0350-24571404141H.pdfcowheat stressTHImetabolic profile |
| spellingShingle | Horvat Jožef Šamanc Horea Kirovski Danijela Vujanac Ivan The influence of heat stress on metabolic status of cows Veterinarski Glasnik cow heat stress THI metabolic profile |
| title | The influence of heat stress on metabolic status of cows |
| title_full | The influence of heat stress on metabolic status of cows |
| title_fullStr | The influence of heat stress on metabolic status of cows |
| title_full_unstemmed | The influence of heat stress on metabolic status of cows |
| title_short | The influence of heat stress on metabolic status of cows |
| title_sort | influence of heat stress on metabolic status of cows |
| topic | cow heat stress THI metabolic profile |
| url | http://www.doiserbia.nb.rs/img/doi/0350-2457/2014/0350-24571404141H.pdf |
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