UPSpace will be temporarily unavailable tonight from 19:00 to 23:00 (South African Time) due to scheduled maintenance. We apologise for any inconvenience this may cause and appreciate your understanding
 

Effect of diets differing in rumen soluble nitrogen on utilization of poor-quality roughage by sheep

dc.contributor.authorMentz, A.M.
dc.contributor.authorVan Niekerk, Willem A.
dc.contributor.authorHassen, Abubeker
dc.contributor.authorCoertze, R.J. (Roelof Johannes)
dc.contributor.authorGemeda, B.S. (Belete Shenkute)
dc.contributor.emailabubeker.hassen@up.ac.zaen_ZA
dc.date.accessioned2016-03-04T06:17:42Z
dc.date.available2016-03-04T06:17:42Z
dc.date.issued2015-12-14
dc.description.abstractThis study investigated the effects of replacing rapid-release nitrogen (N) from urea with a graded level of slow-release N (Optigen® II) source on intake, digestibility, rumen fermentation and microbial protein synthesis, when sheep were fed a poor-quality roughage diet. Five rumen cannulated wethers were used in a 5 x 5 Latin square experimental design. The treatments had various proportions of urea to Optigen® II (0 : 100, 25 : 75, 50 : 50, 75 : 25 and 100 : 0), with the same inclusion level of starch and a mineral premix on an iso-nitrogen basis. The 25% urea : 75% Optigen® II treatment showed significantly higher intakes of dry matter, organic matter, neutral detergent fibre and digestible organic matter than in the other treatments. No differences were recorded for apparent dry matter digestibility, organic matter digestibility and neutral detergent fibre digestibility among the treatments. However, sheep on the 100% Optigen® II treatment had a significantly lower apparent nitrogen digestibility. No differences were observed for ruminal pH and volatile fatty acid concentrations among the treatments, except for butyrate and isobutyrate concentrations. The butyrate concentration of the 100% Optigen® II treatment was significantly lower than the other treatments, whereas the isobutyrate concentration was significantly lower than in Treatments 2 (75% urea : 25% Optigen® II) and 5 (100% Optigen® II). The rumen NH3-N concentration of the 100% Optigen® II treatment was significantly lower than the 100% urea treatment at two and four hours after infusion. Based on biological responses, results suggest that up to 75% of urea could be replaced with Optigen® II in supplements.en_ZA
dc.description.librarianam2015en_ZA
dc.description.sponsorshipThe Protein Research Foundation, Feedtek, NRF and IFS grant.en_ZA
dc.description.urihttp://www.sasas.co.zaen_ZA
dc.identifier.citationMentz, AM, Van Niekerk, WA, Hassen, A, Coertze, RJ & Gemeda, BS 2015, 'Effect of diets differing in rumen soluble nitrogen on utilization of poor-quality roughage by sheep', South African Journal of Animal Science, vol. 45, no. 5, pp. 528-537.en_ZA
dc.identifier.issn0375-1589 (print)
dc.identifier.issn2221-4062 (online)
dc.identifier.other10.4314/sajas.v45i5.10
dc.identifier.urihttp://hdl.handle.net/2263/51684
dc.language.isoenen_ZA
dc.publisherSouth African Society for Animal Scienceen_ZA
dc.rightsCopyright resides with the authors in terms of the Creative Commons Attribution 2.5 South African Licence.en_ZA
dc.subjectDigestibilityen_ZA
dc.subjectIntakeen_ZA
dc.subjectOptigen® IIen_ZA
dc.subjectNon-protein nitrogenen_ZA
dc.subjectRumen ammonia nitrogenen_ZA
dc.titleEffect of diets differing in rumen soluble nitrogen on utilization of poor-quality roughage by sheepen_ZA
dc.typeArticleen_ZA

Files

Original bundle

Now showing 1 - 1 of 1
Loading...
Thumbnail Image
Name:
Mentz_Effect_2015.pdf
Size:
140.8 KB
Format:
Adobe Portable Document Format
Description:
Article

License bundle

Now showing 1 - 1 of 1
Loading...
Thumbnail Image
Name:
license.txt
Size:
1.71 KB
Format:
Item-specific license agreed upon to submission
Description: