Evaluation of Hair Characteristics and Animal Age on the Impact of Hair Cortisol Concentration in Feedlot Steers
作者： Faith Baier , Temple Grandin , Terry Engle , Lily Edwards-Callaway
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摘要: Hair cortisol is a novel biomarker of chronic stress. The objective this study was to determine the effect hair color and length, as well as, animal age on concentration in beef feedlot steers. Nineteen crossbred steers used for nutrition research housed small setting were study. Seven (680 ± 4.5 kg; ~9 years age) fitted with ruminal fistulas duodenal cannulas. other 12 (473 3.1 ~2.5 only fistulas. samples from each steer collected throughout period 6 weeks six different areas analyzed concentrations. One pre-determined area shaved week 5 (Weeks 1-5). During 6, all five, previously an additional collect various lengths. length recorded prior collection sample. Only data last (Week 6) included analyses. Steers categorized into one three groups: old black (OB, n = 3); white (OW, young (YB, 12). Older exhibited greater concentrations than younger (P < 0.001). not impacted by duration growth 0.33). Cortisol weak, positive correlation (r 0.33, P-value 0.01). average per winter months calculated be 0.90 mm. Further should performed improve our understanding characteristics, sampling methodologies analysis techniques
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