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.contributor.author | Cappellozza, B. I. | |
| dc.contributor.author | Cooke, R. F. | |
| dc.contributor.author | Guarnieri Filho, T. A. [UNESP] | |
| dc.contributor.author | Bohnert, D. W. | |
| dc.contributor.institution | Oregon State Univ | |
| dc.contributor.institution | Universidade Estadual Paulista (Unesp) | |
| dc.date.accessioned | 2014-12-03T13:09:01Z | |
| dc.date.available | 2014-12-03T13:09:01Z | |
| dc.date.issued | 2014-06-01 | |
| dc.description.abstract | Two 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. | en |
| dc.description.affiliation | Oregon State Univ, Eastern Oregon Agr Res Ctr, Burns, OR 97720 USA | |
| dc.description.affiliation | UNESP Univ Estadual Paulista, Programa Posgrad Zootecnia, Fac Med Vet & Zootecnia, BR-18618970 Botucatu, SP, Brazil | |
| dc.description.affiliationUnesp | UNESP Univ Estadual Paulista, Programa Posgrad Zootecnia, Fac Med Vet & Zootecnia, BR-18618970 Botucatu, SP, Brazil | |
| dc.description.sponsorship | Oregon Agricultural Experiment Station | |
| dc.description.sponsorship | USDA-ARS | |
| dc.description.sponsorship | Oregon Beef Council and the Agricultural Research Foundation | |
| dc.format.extent | 2716-2724 | |
| dc.identifier | http://dx.doi.org/10.2527/jas2013-7441 | |
| dc.identifier.citation | Journal Of Animal Science. Champaign: Amer Soc Animal Science, v. 92, n. 6, p. 2716-2724, 2014. | |
| dc.identifier.doi | 10.2527/jas2013-7441 | |
| dc.identifier.issn | 0021-8812 | |
| dc.identifier.uri | http://hdl.handle.net/11449/111826 | |
| dc.identifier.wos | WOS:000337351700040 | |
| dc.language.iso | eng | |
| dc.publisher | Amer Soc Animal Science | |
| dc.relation.ispartof | Journal of Animal Science | |
| dc.relation.ispartofjcr | 1.711 | |
| dc.relation.ispartofsjr | 0,848 | |
| dc.rights.accessRights | Acesso restrito | |
| dc.source | Web of Science | |
| dc.subject | beef cattle | en |
| dc.subject | low-quality forage | en |
| dc.subject | performance | en |
| dc.subject | physiology | en |
| dc.subject | ruminal forage disappearance | en |
| dc.subject | supplementation | en |
| dc.title | 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 | en |
| dc.type | Artigo | |
| dcterms.rightsHolder | Amer Soc Animal Science |