Naslov
Temperature-humidity index values and their significance on the daily production of dairy cattle

Autori
Gantner, Vesna ; Mijić, Pero ; Kuterovac, Krešimir ; Solić, Drago ; Gantner, Ranko

Izvornik
Mljekarstvo (0026-704X) 61 (2011), 1; 56-63

Vrsta, podvrsta i kategorija rada
Radovi u časopisima, članak, znanstveni

Ključne riječi
dairy cattle ; daily production ; temperature-humidity index

Sažetak
Based on analysis of microclimatic conditions in stables in climactic regions of Croatia and evaluation of the effect of temperature- humidity index value on the daily production of dairy cattle following conclusions could be emphasised: The highest monthly averages of ambient temperature during analysed period were determined in Mediterranean region, the highest monthly averages of relative humidity during analysed period were observed in Central region, while the highest monthly mean values of temperature-humidity index (THI) were determined in Mediterranean region. Heat stress conditions indicated with mean daily values of THI>72 were determined during spring and summer season in all analysed regions. The highest incidence of exceeded THI was observed in Mediterranean region (15 days in spring and 38 days in summer period). Abscence of heat stress conditions during autumn and winter season characterised all three regions. Highly significant (P<0, 01) decrease of daily milk yield due to enhanced THI was observed in all cows regardless the parity class and in all three climatic regions. Regarding the effect of THI value above critical on daily fat and protein content, highly significant (P<0, 01) decrease was observed in all cows and in all analysed regions. Furthermore, the most deteriorate effect of heat stress was observed in East region. During heat stress period, with the aim of minimization of the effects of heat stress, it is necessary to regulate management strategies in the dairy herd. There are many tools available to help the dairy farmer combat heat stress. For instance, environmental cooling can maintain feed intake and nutrient density of feed can optimize nutrient intake to maintain milk production.

Izvorni jezik
Engleski

Znanstvena područja
Poljoprivreda (agronomija)

POVEZANOST RADA