Supplementation based on protein or energy ingredients to beef cattle consuming low-quality cool-season forages: I. Forage disappearance parameters in rumen-fistulated steers and physiological responses in pregnant heifers

dc.contributorOregon State Univ
dc.contributorUniversidade Estadual Paulista (Unesp)
dc.creatorCappellozza, B. I.
dc.creatorCooke, R. F.
dc.creatorGuarnieri Filho, T. A. [UNESP]
dc.creatorBohnert, D. W.
dc.date2014-12-03T13:09:01Z
dc.date2014-12-03T13:09:01Z
dc.date2014-06-01
dc.date.accessioned2023-09-09T09:49:41Z
dc.date.available2023-09-09T09:49:41Z
dc.identifierhttp://dx.doi.org/10.2527/jas2013-7441
dc.identifierJournal Of Animal Science. Champaign: Amer Soc Animal Science, v. 92, n. 6, p. 2716-2724, 2014.
dc.identifier0021-8812
dc.identifierhttp://hdl.handle.net/11449/111826
dc.identifier10.2527/jas2013-7441
dc.identifierWOS:000337351700040
dc.identifier.urihttps://repositorioslatinoamericanos.uchile.cl/handle/2250/8761485
dc.descriptionTwo experiments evaluated the influence of supplement composition on ruminal forage disappearance, performance, and physiological responses of Angus x Hereford cattle consuming a low-quality cool-season forage (8.7% CP and 57% TDN). In Exp. 1, 6 rumen-fistulated steers housed in individual pens were assigned to an incomplete 3 x 2 Latin square design containing 2 periods of 11 d each and the following treatments: 1) supplementation with soybean meal (PROT), 2) supplementation with a mixture of cracked corn, soybean meal, and urea (68:22:10 ratio, DM basis; ENER), or 3) no supplementation (CON). Steers were offered meadow foxtail (Alopecurus pratensis L.) hay for ad libitum consumption. Treatments were provided daily at 0.50 and 0.54% of shrunk BW/steer for PROT and ENER, respectively, to ensure that PROT and ENER intakes were isocaloric and isonitrogenous. No treatment effects were detected on rumen disappearance parameters of forage DM (P >= 0.33) and NDF (P >= 0.66). In Exp. 2, 35 pregnant heifers were ranked by initial BW on d -7 of the study, allocated into 12 feedlot pens (4 pens/treatment), and assigned to the same treatments and forage intake regimen as in Exp. 1 for 19 d. Treatments were fed once daily at 1.77 and 1.92 kg of DM/heifer for PROT and ENER, respectively, to achieve the same treatment intake as percent of initial BW used in Exp. 1 (0.50 and 0.54% for PROT and ENER, respectively). No treatment effects (P = 0.17) were detected on forage DMI. Total DMI was greater (P < 0.01) for PROT and ENER compared with CON and similar between PROT and ENER (P = 0.36). Accordingly, ADG was greater (P = 0.01) for PROT compared with CON, tended to be greater for ENER compared with CON (P = 0.08), and was similar between ENER and PROT (P = 0.28). Heifers receiving PROT and ENER had greater mean concentrations of plasma glucose (P = 0.03), insulin (P <= 0.09), IGF-I (P <= 0.04), and progesterone (P = 0.01) compared to CON, whereas ENER and PROT had similar concentrations of these variables (P >= 0.15). A treatment x hour interaction was detected (P < 0.01) for plasma urea N (PUN), given that PUN concentrations increased after supplementation for ENER and PROT (time effect, P < 0.01) but did not change for CON (time effect, P = 0.62). In conclusion, beef cattle consuming low-quality cool-season forages had similar ruminal forage disappearance and intake, performance, and physiological status if offered supplements based on soybean meal or corn at 0.5% of BW.
dc.descriptionOregon Agricultural Experiment Station
dc.descriptionUSDA-ARS
dc.descriptionOregon Beef Council and the Agricultural Research Foundation
dc.descriptionOregon State Univ, Eastern Oregon Agr Res Ctr, Burns, OR 97720 USA
dc.descriptionUNESP Univ Estadual Paulista, Programa Posgrad Zootecnia, Fac Med Vet & Zootecnia, BR-18618970 Botucatu, SP, Brazil
dc.descriptionUNESP Univ Estadual Paulista, Programa Posgrad Zootecnia, Fac Med Vet & Zootecnia, BR-18618970 Botucatu, SP, Brazil
dc.format2716-2724
dc.languageeng
dc.publisherAmer Soc Animal Science
dc.relationJournal of Animal Science
dc.relation1.711
dc.relation0,848
dc.rightsAcesso restrito
dc.sourceWeb of Science
dc.subjectbeef cattle
dc.subjectlow-quality forage
dc.subjectperformance
dc.subjectphysiology
dc.subjectruminal forage disappearance
dc.subjectsupplementation
dc.titleSupplementation based on protein or energy ingredients to beef cattle consuming low-quality cool-season forages: I. Forage disappearance parameters in rumen-fistulated steers and physiological responses in pregnant heifers
dc.typeArtigo


Este ítem pertenece a la siguiente institución