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Performance of Purebred Senepol and Hereford Sters on Endophyte - Infected Tal Fescue in Tenese Richard Browning, Jr. Bef catle production is the largest agricultural enterprise in Tenese (20% of cash receipts; $40 milion in 20). Endophyte - infected tal fescue is a widely used forage to fed bef catle in Tenese. Fescue toxicosis reduces catle performance and subsequent profitability. VHeat stres is exacerbated in catle grazing endophytic tal fescue. V Browning, 20. J. Anim. Sci. 78:124 - 130. VBrowning and Thompson, 202. Vet. Hum. Toxicol. 4:149 - 154. Objective: to compare the growth and thermoregulatory responses of heat - tolerant and heat - sensitive catle breds to endophytic fescue. Hypothesis: the efects of fescue toxicosis are not as dramatic in heat - tolerant catle as observed in heat - sensitive catle. Materials & Methods VHereford (n=30; H ) and Senepol (n=28; S ) sters were fed orchardgras ( OG ) hay in spring. VIn sumer, 15 H and 14 S were fed endophyte - infected tal fescue ( TF ) while 15 H and 14 S were fed OG. +4 * : Mere — - a t- -_ att " iy - —— bi ® i —_ =~ et | — gol “ -@ Yr - ool en tet +. ae +. mm > i at i> > P| . -— nd e da Nd ie a — \¢ x W A PO «pt iy Se Zs a) fe ais ~~ ~~ ~¥ ~* ow er a rs —" ~ \_ oe < \ ~~! me om if _—_ ~ =. > Wx *. ™ ve, - ed wt 4 + vhe e vy “1 ~4 a ow ov Y is i> ah ue ay Mea om “a+ ook Viet > i} « Fe Pe y he ; sid as — ,* Ff = = > ome ee Pere ie h — = lye — ~a oe Ta = : apd PA Ets & a, SS % ms iD. a too en a \ Se Ve oe Mie Im i as <x rss Ferre i Se x ens } ON oe aes ca SS x oe a POR oe Ga ers c. 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Respiration Rates in Steers i ft KA t<[ ‘| Leff] bd 5 dad Kd {4 x4 td ik EE | > ba Reet HOG | HTF soc [0 str 110 c a 9) d a a b 9) — 100 90 80 ik “| [= ik nen iB ik zl ik ik ik ik ik ik 70 ik ik ik ik ik ik ik He ik ik He 60 ik ik He — ik ik He ik ik He ik SN i ik ig hee He LJ] dad ik id=] tad ik He Le tock ncdectocd ocdctod bbb id ik reset a es at es Pete il ik Lf Kd ad ctl nd ced nd oct aT |» d |’ He i See Kd Kd rere ad Fa ik pa 2000 2001 Daytime Shade Utilization i ft KA t<[ ‘| Leff] td 5 dad Kd {4 x4 td ik EE | > ba Reet HOG | HTF soc [0 str 110 c a d a a b 9) 100 > 90 80 70 60 Fe ik lal tt. ik J ttt ik ik et etedededed ik ik ik ik ik a sk ik oH ‘ ik a ‘ly ik — He oH ik ‘ly ik He oH ik ‘ly 30 ik He oH ik ‘ly ik He oH ik ‘ly 20 ik He oH ik ‘ly ik He oH ik ‘ly ik oH 10 He ik ‘ly ik ieemen oH bk KN Aad cat | He ‘{ i at Pa {= of Fa ik E ieee 2000 2001 eae - — ee ~~ < »* ee ‘io i \ a7 —_—_—— —_—- — — yee i 7 A WEA ~~" - *y Mi. 4s se » v. aoe We ™ a 2 a Sas ir WS ——— ha >» a _ F —— we _—F 9 } » <- » 4 goal use SUNS ort a e es 7 2 ~) ah Lf. oS AS >> >i Bx a : — 4 1, Coat e wr ay Ane na Se wy T+ ue] ie 5 : ret Bh Sos) thn ay ai 2 at > ad a4 *» 5 — sa nee = ae ee v7 ~~“ ie ees. 4 LS ae ses ie ae we i ss oO ** — ~wid va - ~—> Van ot ‘ot — a _ or ee *- ae a ~) ly! kes 4 - = ~ _- s* lad r-) int i ae ose a7 * we. ‘e o .'4 WN r may ve s+ oo? 4 ste Pa fui” a -.« ‘te. ” ey Leer | 5 >>} t- yey ¢xe-r pont - + of > ‘s s* yw ta ta i) ty ++ oy is ne ¥ a4 we a a Weight Gain, kg/d 0.70 0.50 0.40 0.30 0.20 0.10 Average Daily Weight Gain - 2000 BreedxDiet (P =.001) — HOG || HTF || SOG — STF 12 Weeks on Experimental Diet Weight Gain, kg/d Average Daily Weight Gain - 2001 Breed x Diet (P < .001) “noe |= uTF | sop: «| StF 0.80 | 0.70 | 0.60 | 0.50 | 0.40 | 0.30 | 0.20 | 0.10 | -0.10 Six Weeks on Experimental Diet -@- soc -0- stF —- ee = te FI AM ae ) ; ao ——— —_