Assessment of heat stress behaviors and HSP 70 of gilts exposed to varying temperature in controlled chamber
2015
Lontoc, C.A.A.
The study aimed to determine the effect of increasing temperature on physiological performances and HSP 70 concentration of gilts (n=3; bw=98+-6 kg). They were individually housed in pen inside the controlled chamber with fixed RH (70%). There were 4 THI set up (65 (19 deg C), 71(23 deg C), 77(27 deg C) and 83(31 deg C)) in the study wherein each THI was constant for 3 consecutive days. Feeds and drinks were given ad libitum. Monitoring of pulse rate, respiration rate (RR) and rectal temperature were done every morning and afternoon before the blood collection. Blood was collected from the ear vein and the collected samples were analyzed using HSP 70 ELISA. Highest RR (p0.005) and HSP 70 concentration (P0.05) was observed then THI set up was 77 and 83, respectively. Meanwhile, feed intake decreased with increasing THI. Interaction effect of day and time of HSP 70 concentrations were also observed. Results also showed significant differences in duration and frequency of behaviours like meal intake, meal break, standing, lying and drinking as affected by temperature and period of observation. Therefore this study clearly reveals that HSP 70 at THI 71, RR at THI 77 as well as cumulative morning or afternoon meal intake are the best indicator of heat stress. Significantly lower than 2250+-345 sec (37.5+-5.8 min) cumulative duration of meal intake is an indicator of heat stress in the morning or afternoon feeding.
显示更多 [+] 显示较少 [-]