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Effect of roughage to concentrate ratio on ruminal fermentation and protein degradability in dairy cows
Dissertation (MSc(Agric))--University of Pretoria, 2009.
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University of Pretoria
2013
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| _version_ | 1867613449854386176 |
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| access_status_str | Open Access |
| author2 | Van Niekerk, Willem A. |
| author_browse | Van Niekerk, Willem A. |
| author_facet | Van Niekerk, Willem A. |
| collection | Thesis |
| dc_rights_str_mv | ©University of Pretoria 2008 E1253/ |
| description | Dissertation (MSc(Agric))--University of Pretoria, 2009. |
| format | Thesis |
| id | oai:repository.up.ac.za:2263/28264 |
| institution | University of Pretoria (South Africa) |
| last_indexed | 2026-06-10T12:36:19.976Z |
| license_str | Other — see source repository |
| provenance_str_mv | Harvested via OAI-PMH from UPSpace — University of Pretoria Institutional Repository |
| publishDate | 2013 |
| publishDateRange | 2013 |
| publishDateSort | 2013 |
| publisher | University of Pretoria |
| publisherStr | University of Pretoria |
| record_format | dspace |
| source_str | UPSpace — University of Pretoria Institutional Repository |
| spelling | oai:repository.up.ac.za:2263/28264 Effect of roughage to concentrate ratio on ruminal fermentation and protein degradability in dairy cows Van Niekerk, Willem A. Erasmus, L.J. (Lourens Jacobus) southafricanboer@yahoo.com Nienaber, Herman Dairy cows Rup Rumen undegradable protein UCTD Dissertation (MSc(Agric))--University of Pretoria, 2009. Published research suggests that it might be beneficial to increase the amount of rumen undegradable protein (RUP) that passes out of the rumen, through manipulation of rumen fermentation to establish a lower rumen pH. To test this hypothesis, a study was conducted in which three ruminally cannulated Holstein cows, 722 kg ±25.6 kg fed three different diets (treatments) were used in a Latin square design experiment to determine effects of increasing levels of dietary concentrate on some rumen parameters and ruminal crude protein (CP) degradability. The in situ method was used to determine the ruminal protein degradability of sunflower oilcake, cottonseed oilcake and roasted soya. The three treatments differed in roughage:concentrate ratio, being 60:40 (Treatment UP 60), 45:55 (Treatment UP 45) and 30:70 (Treatment UP 30). Intake of dry matter (DM) (kg/day) did not differ between treatments. The mean rumen pH in cows receiving the three experimental diets differed and was 6.00, 6.27 and 6.44 for treatments UP 30, UP 45 and UP 60 respectively. The time (hours) below pH 5.8, which is considered to be the pH where fibre degradation is substantially negatively affected, was approximately 2.5 hours, but only on treatment UP 30. Mean rumen ammonia nitrogen (N) and total volatile fatty acid (VFA) concentrations did not differ among cows receiving different treatments but, cows fed treatment UP 30 had a lower ruminal acetic acid:propionic acid (A:P) ratio compared to the other treatments. There were no differences in ruminal CP degradation within the three feedstuffs when incubated in cows fed diets with different roughage:concentrate ratios. Results suggest that roughage:concentrate ratios ranging from 60:40 to 30:70, which resulted in mean pH values ranging from 6.4 to 6.0, did not affect ruminal CP degradation of sunflower oilcake, cottonseed oilcake and roasted soya. Animal and Wildlife Sciences unrestricted 2013-09-07T13:12:23Z 2009-04-15 2013-09-07T13:12:23Z 2008-09-03 2009-04-15 2009-02-12 Dissertation 2008 E1253/gm http://hdl.handle.net/2263/28264 http://upetd.up.ac.za/thesis/available/etd-02122009-151435/ ©University of Pretoria 2008 E1253/ application/pdf University of Pretoria |
| spellingShingle | Dairy cows Rup Rumen undegradable protein UCTD Effect of roughage to concentrate ratio on ruminal fermentation and protein degradability in dairy cows |
| title | Effect of roughage to concentrate ratio on ruminal fermentation and protein degradability in dairy cows |
| title_full | Effect of roughage to concentrate ratio on ruminal fermentation and protein degradability in dairy cows |
| title_fullStr | Effect of roughage to concentrate ratio on ruminal fermentation and protein degradability in dairy cows |
| title_full_unstemmed | Effect of roughage to concentrate ratio on ruminal fermentation and protein degradability in dairy cows |
| title_short | Effect of roughage to concentrate ratio on ruminal fermentation and protein degradability in dairy cows |
| title_sort | effect of roughage to concentrate ratio on ruminal fermentation and protein degradability in dairy cows |
| topic | Dairy cows Rup Rumen undegradable protein UCTD |
| url | http://hdl.handle.net/2263/28264 http://upetd.up.ac.za/thesis/available/etd-02122009-151435/ |