Cortisol response of gilts in tether stalls.

摘要: Several experiments were conducted to evaluate serum cortisol concentrations and the circadian rhythm of this hormone in gilts tethered stalls. Control animals penned individually. In initial experiment, 18 nongravid placed tether stalls after being either or individual pens for 2 wk. No significant differences found concentrations. a second 16 ovariectomized up 5 Estrus was induced during wk 3 4. During first day stalls, increased (P less than .05) disrupted 4 d. estrus, interrupted several days gilts, regardless housing. After wk, morning higher The results indicate that: 1) response tethering varies according previous penning handling experience, 2) although altered such disruptions not influenced by type 3) may chronically increase gilts.