The differences in heat stress resistance due to dairy cattle breed (CROSBI ID 242384)
Prilog u časopisu | izvorni znanstveni rad | međunarodna recenzija
Podaci o odgovornosti
Gantner, Vesna ; Bobić, Tina ; Gregić, Maja ; Gantner, Ranko ; Kuterovac, Krešimir ; Potočnik, Klemen
engleski
The differences in heat stress resistance due to dairy cattle breed
In light of increasingly rapid climate change worldwide, and with the purpose to reduce financial losses for dairy farmers and enable a more sustainable farming, the necessity to implement breeding values for heat resistance in breeding strategies, has become more and more pronounced. Estimation of breeding values requires determination of temperature-humidity index (THI) threshold value. Therefore, the objective of this paper was to determine temperature-humidity index (THI) threshold values for daily milk yield, daily fat and protein content of milk produced by Holsteins and dairy Simmentals in Croatian farms. With that purpose, 1, 070, 554 test-day records from 70, 135 Holsteins reared on 5, 679 farms and 1, 300, 683 test-day records from 86, 013 Simmentals reared on 8, 827 farms in Croatia were compared to records of ambient temperature and relative humidity collected in the barn, during regular milking recordings from January 2005 to December 2012. Based on this analysis the following conclusions could be drawn: threshold values for daily milk yield highly depends on parity and breed (Holsteins: 68, 69 and 72 for 1st, 2nd, 3+ parity ; Simmentals: 77 for 1st) ; daily fat and protein contents showed a highly significant decrease due to heat stress condition (THI in 66 – 80) in both, Holstein and Simmental cows, and in all parity classes ; multiparous cows were more resistant to heat stress than primiparous ; Simmental cows were more resistant to heat stress than Holsteins.
dairy cattle ; Holstein ; Simmental ; heat stress ; threshold value
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Podaci o izdanju
Povezanost rada
Biotehnologija, Poljoprivreda (agronomija)