| Autor: |
Ruban, Sergiy, Borshch, Oleksandr O., Borshch, Oleksandr V., Orischuk, Oksana, Balatskiy, Yuriy, Fedorchenko, Maksym, Kachan, Anatolii, Zlochevskiy, Mikhailo |
| Předmět: |
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| Zdroj: |
Animal Science Papers & Reports; 2020, Vol. 38 Issue 1, p61-72, 12p |
| Abstrakt: |
The aim of our research was to estimate the effect of high temperatures on respiration rate, breathing condition and productivity of Holstein cows in different production systems. The best values of air temperature (Tair), breathing frequency, Environmental Stress Index (ESI) and Heat Load Index (HLI) among the investigated production systems were recorded on a farms with misting and ventilation systems. In the period of the highest thermal stress (12.00–16.00 pm), Tair did not exceed 29ºC, breathing rate – 77 breaths/min, ESI – 39.07ºC and HLI – 76.29. Least optimal for cow comfort values were found in the low cost housing: Tair – 33ºC, breathing rate – 82 breaths/min, ESI – 41.88ºC and HLI – 79.80. Intermediate values were observed at the open feedlots with shelters: Tair – 33ºC, breathing rate – 79 breaths/min, ESI – 41.18ºC and HLI – 77.98. For all types of production systems the average daily temperature rise to +27.7°C became a significant stress factor for cows, which considerably influenced the dynamics of breathing rate, breathing severity, ESI and HLI values. It was established that keeping cows in facilities with misting and ventilation systems and on open feedlots, the Temperature-Humidity Index (THI), breathing rate and severity during the period of maximum temperature load (12.00-16.00 pm) were lower than that for low cost housing. The use of misting and ventilation systems allowed to minimise productivity losses during the period of thermal stress, which decreased by 2.67%, while for maintenance at feedlots the losses amounted to 9.22%, while in the low cost housing – 11.88%. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
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