Influence of supplement composition on utilization of low-quality, cool-season forages by beef cattle Public Deposited

http://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/w0892f25v

Descriptions

Attribute NameValues
Creator
Abstract or Summary
  • Two studies were conducted to evaluate the influence of supplement composition on intake and digestibility of a low-quality (< 6% CP), cool-season forage, as well as cow performance. Treatments included a non-supplemented control (CON), corn (approximately 8% CP), corn and urea (LU = corn + 0.09 mg/kg BW urea, approximately 27% CP; HU = corn + 0.17 mg/kg BW urea, approximately 43% CP) and a positive control of SBM (approximately 51% CP). In Experiment 1, 5 ruminally cannulated Angus x Hereford steers (560 ± 79 kg of BW) were used in an incomplete 5 x 4 Latin square with four 28-d periods to compare the effects of urea addition to a corn-based supplement on forage intake, digestibility and ruminal fermentation characteristics. Forage intake and digestibility were not influence by supplementation (P > 0.10); however, intake was greater for SBM than HU (P = 0.01). Ruminal NH₃-N increased with supplementation (P < 0.01), increased linearly with urea inclusion (P < 0.01) and was greater for HU than SBM (P < 0.01), However, ruminal NH₃-N for non-supplemented steers was 1.61 mM, within the range believed to support optimal growth of rumen microbes in vivo, suggesting that ruminally available-N was not limiting forage utilization. Total volatile fatty acid concentration was not influenced by supplement composition (P > 0.10). In Experiment 2, 80 late gestation (approximately 190 d pregnant) Angus x Hereford cows (507 ± 10 kg) were stratified by age, BCS, and BW and randomly allotted to the treatments described in Experiment 1 (20 pens; 4 cows/pen; 4 pens/treatment). Cow BW and BCS change were improved with supplementation (P < 0.01) and with increasing urea inclusion (P < 0.01), but did not differ between the HU and SBM treatments (P > 0.10). Cow BUN (P = 0.05), glucose and NEFA were not influenced by supplementation (P > 0.10); supplementation increased IGF-I (P < 0.01) and tended to increase insulin (P = 0.07). Blood variable concentrations did not differ between HU and SBM. These results suggest that a starch-based energy supplement fed at less than 0.5% of BW in conjunction with urea is an acceptable management alternative to supplementation with natural protein for ruminants consuming low-quality, cool-season forages.
Resource Type
Date Available
Date Copyright
Date Issued
Degree Level
Degree Name
Degree Field
Degree Grantor
Commencement Year
Advisor
Committee Member
Academic Affiliation
Non-Academic Affiliation
Keyword
Subject
Rights Statement
Peer Reviewed
Language
Replaces
Additional Information
  • description.provenance : Approved for entry into archive by Laura Wilson(laura.wilson@oregonstate.edu) on 2013-10-21T23:33:07Z (GMT) No. of bitstreams: 2 license_rdf: 1232 bytes, checksum: bb87e2fb4674c76d0d2e9ed07fbb9c86 (MD5) McGuireDustinL2014.pdf: 490436 bytes, checksum: fd2b5573b689a6436e939ee31cc6f637 (MD5)
  • description.provenance : Approved for entry into archive by Julie Kurtz(julie.kurtz@oregonstate.edu) on 2013-10-17T18:27:48Z (GMT) No. of bitstreams: 2 license_rdf: 1232 bytes, checksum: bb87e2fb4674c76d0d2e9ed07fbb9c86 (MD5) McGuireDustinL2014.pdf: 490436 bytes, checksum: fd2b5573b689a6436e939ee31cc6f637 (MD5)
  • description.provenance : Submitted by Dustin Mc Guire (mcguirdu@onid.orst.edu) on 2013-10-16T22:51:45Z No. of bitstreams: 2 license_rdf: 1232 bytes, checksum: bb87e2fb4674c76d0d2e9ed07fbb9c86 (MD5) McGuireDustinL2014.pdf: 490436 bytes, checksum: fd2b5573b689a6436e939ee31cc6f637 (MD5)
  • description.provenance : Rejected by Julie Kurtz(julie.kurtz@oregonstate.edu), reason: Hi Dustin, Rejecting to change the department name on the Approval page to read - Head of the Department of Animal and Rangeland Sciences. Currently it reads Head of the Department of Animal Science and Rangeland Sciences. Once revised log into ScholarsArchive. Go to the upload page and replace the attached file with the revised file and resubmit. Thanks, Julie on 2013-10-16T18:07:42Z (GMT)
  • description.provenance : Submitted by Dustin Mc Guire (mcguirdu@onid.orst.edu) on 2013-10-15T22:10:32Z No. of bitstreams: 2 license_rdf: 1232 bytes, checksum: bb87e2fb4674c76d0d2e9ed07fbb9c86 (MD5) McGuireDustinL2014.pdf: 511839 bytes, checksum: 0f6ae5f9b12fb5d598f42e77f2414d73 (MD5)
  • description.provenance : Made available in DSpace on 2013-10-21T23:33:07Z (GMT). No. of bitstreams: 2 license_rdf: 1232 bytes, checksum: bb87e2fb4674c76d0d2e9ed07fbb9c86 (MD5) McGuireDustinL2014.pdf: 490436 bytes, checksum: fd2b5573b689a6436e939ee31cc6f637 (MD5) Previous issue date: 2013-08-29

Relationships

In Administrative Set:
Last modified: 08/17/2017

Downloadable Content

Download PDF
Citations:

EndNote | Zotero | Mendeley

Items