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Physiological responses of cattle consuming tall fescue to environmental temperature and supplemental phenothiazine



Physiological responses of cattle consuming tall fescue to environmental temperature and supplemental phenothiazine



Journal of Animal Science 67(9): 2377-2385



The influence of supplemental phenothiazine (P) on growth and physiological criteria was studied in parasite-controlled calves consuming endophyte (Acremonium coenphialum)-infected tall fescue (TF). In Exp. 1, nine Angus heifer calves (312 kg) were supplemented with 227 g corn-mineral (CM) mix twice daily and allowed ad libitum access to either high-endophyte (HE) G1-307 (>90% infected) or low-endophyte (LE) Kenhy (<1% infected) tall fescue hay, or HE G1-307 plus 2 g/d P in the daily supplement. Calves were kept in temperature-controlled rooms for 12 d at 21.degree.C followed by 7 d at 34.degree.C. In Exp. 2, 48 Angus steer calves (312 kg) were assigned to treatment groups consisting of calves grazing HE Kentucky-31 (57% infected) or LE Johnstone (<1% infected) TF, and supplemented daily with either .91 kg of a control CM mix or .91 kg of the CM mix containing 2 g P. The 112-d experiment was initiated on May 4 with BW and rectal temperature (RT) measurements and blood collected at 28-d intervals. In both experiments, calves receiving HE TF had lower (P < .01) serum prolactin concentrations (PRL) at elevated ambient temperature and lower (P < .01) serum alkaline phosphatase activities (AP) but higher (P < .01) RT than calves consuming LE TF regardless of ambient temperture. In Exp. 1, PRL and AP were not affected (P < .15) by P. In Exp. 2 daily gain through gain through 112 d was lower (P < .01) for calves grazing HE than for those grazing LE TF (.66 vs 91 kg/d) but not affected (P < .15) by P. No interaction of P and endophyte level was detected. Calves fed P in Exp. 2 had higher AP (P < .01) and PRL (P < .12) than control calves. These data indicate that P may reduce HE-associated depression of PRL and AP in cattle grazing TF; however, the magnitude of these reductions may depend partially on ambient temperature, with less effect at an elevated temperature.

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Accession: 001909918

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PMID: 2599980



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