Four Angussteers(BW¼35073 kg)withesophagealcannulaeandfourfittedwith
ruminal cannulas(BW¼35175 kg)aswellasfifteensteersofthesameracialcharacter-
istics(BW¼32072 kg),wereusedtoevaluateseasonallyacrossfouryears(2005–2009,
excluding2007)thenutritivequalityofdietandthebloodmetabolitesandinsulinlevels
in grazingbeefcattleaChihuahuandesertrangeland.Thedietconsumedbygrazingcattle
during springandwinterwaslowqualitybecauseofcrudeprotein(CP)waslessthan
70 g/kgDMandneutraldetergentfiber(NDF)higherthan720g/kgDM.Initialwashing
loss attimezero “A”, digestionrate “c”, effectivedegradabilityofNDF(EDNDF)and
CP (EDCP),potentialgasproduction(PGP),ruminalammonia–nitrogen (NH3N),total
volatile fattyacids(TVFA)propionate,butyrate,glucose(G),ureanitrogen(UN)and
insulinwerehighestinsummercomparedtospring(Po0.05). Incontrast,ruminal
acetate concentrationsandbloodnon-esterifiedfattyacids(NEFA)levelwerehighestin
spring ascomparedtosummer(Po0.05). Itwasconcludedthatseasonofgrazinghad
a markedinfluenceondietqualityaswellasinthebloodmetabolitesandinsulinlevelsin
grazing beefcattleadesertrangeland.
Four Angussteers(BW¼35073 kg)withesophagealcannulaeandfourfittedwithruminal cannulas(BW¼35175 kg)aswellasfifteensteersofthesameracialcharacter-istics(BW¼32072 kg),wereusedtoevaluateseasonallyacrossfouryears(2005–2009,excluding2007)thenutritivequalityofdietandthebloodmetabolitesandinsulinlevelsin grazingbeefcattleaChihuahuandesertrangeland.Thedietconsumedbygrazingcattleduring springandwinterwaslowqualitybecauseofcrudeprotein(CP)waslessthan70 g/kgDMandneutraldetergentfiber(NDF)higherthan720g/kgDM.Initialwashingloss attimezero “A”, digestionrate “c”, effectivedegradabilityofNDF(EDNDF)andCP (EDCP),potentialgasproduction(PGP),ruminalammonia–nitrogen (NH3N),totalvolatile fattyacids(TVFA)propionate,butyrate,glucose(G),ureanitrogen(UN)andinsulinwerehighestinsummercomparedtospring(Po0.05). Incontrast,ruminalacetate concentrationsandbloodnon-esterifiedfattyacids(NEFA)levelwerehighestinspring ascomparedtosummer(Po0.05). Itwasconcludedthatseasonofgrazinghada markedinfluenceondietqualityaswellasinthebloodmetabolitesandinsulinlevelsingrazing beefcattleadesertrangeland.
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