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Die vervanging van mieliegraan met koroggraan in suiwelkonsentrate vir melkbeeste
Thesis (MScAgric) -- Stellenbosch University, 1991.
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| Format: | Thesis |
| Language: | Afrikaans |
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Stellenbosch : Stellenbosch University
2012
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| _version_ | 1867614015911362560 |
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| access_status_str | Open Access |
| author | Griessel, Andre |
| author2 | Smith, W. A. |
| author_browse | Griessel, Andre Smith, W. A. |
| author_facet | Smith, W. A. Griessel, Andre |
| author_sort | Griessel, Andre |
| collection | Thesis |
| dc_rights_str_mv | Stellenbosch University |
| description | Thesis (MScAgric) -- Stellenbosch University, 1991. |
| format | Thesis |
| id | oai:scholar.sun.ac.za:10019.1/69232 |
| institution | Stellenbosch University (South Africa) |
| language | Afrikaans |
| last_indexed | 2026-06-10T12:45:19.124Z |
| license_str | Other — see source repository |
| provenance_str_mv | Harvested via OAI-PMH from SUNScholar — Stellenbosch University Repository |
| publishDate | 2012 |
| publishDateRange | 2012 |
| publishDateSort | 2012 |
| publisher | Stellenbosch : Stellenbosch University |
| publisherStr | Stellenbosch : Stellenbosch University |
| record_format | dspace |
| source_str | SUNScholar — Stellenbosch University Repository |
| spelling | oai:scholar.sun.ac.za:10019.1/69232 Die vervanging van mieliegraan met koroggraan in suiwelkonsentrate vir melkbeeste Griessel, Andre Smith, W. A. Stellenbosch University. Faculty of AgriSciences. Dept. of Animal Sciences. Ruminants -- Feeding and feeds Dairy cattle -- Feeding and feeds Corn as feed Grain as feed Milk yield Dissertations -- Agriculture Thesis (MScAgric) -- Stellenbosch University, 1991. The aim of this study was to evaluate the replacing of maize with triticale cereal (USGEN 10) in diets for ruminants and specific dairy cows by means of 4 experiments. In experiment 1 a digestion trial was conducted using wethers fed four crude diets containing different proportions of triticale : maize; (1) 100 : 0, (2) 66 : 34, (3) 34 : 66, (4) 0 : 100. The wethers were fed 50 g/kg W⁰·⁷⁵ per day. Five wethers per treatment were used in a 7 day collection period. Digestibility coefficients for dry matter, organic matter and crude fibre as well as nitrogen retention were generally similar and not significantly different (p>0,05) among treatments. However, the digestibility coefficients for the ether extract with treatment 3 (82,08%) was significantly higher (p<0,01) than the digestibility coefficients for the ether extract with treatments 1;2 and 4 (72,68; 62,97 and 79,65%) respectively. The percentages of total digestible nutrients were generally similar and not significantly different (p>0,05) among treatments and were 75,95; 72,30; 79,56 and 77,73% respectively. In experiment 2 a digestion trial with four complete diets, as shown in experiment 1, was conducted using four steers per treatment. Diets were fed at 110 g/kg W⁰·⁷⁵ per day. Chromium as chromic oxide was used as a marker to determine total faecal excretion. Faecal samples were collected over a period of 8 days. Digestibility coefficients for dry matter, organic matter, crude fibre, ether extract and the percentages of total digestible nutrients were generally similar and not significantly different (p>0,05) among treatments. The percentages of total digestible nutrients with treatments 1;2;3 and 4 were 70,00; 70,57; 71,96 and 69,92% respectively. The dry matter, organic matter and protein degradation of triticale, wheat, maize and tapioca were determined in situ in experiment 3 with rumen cannulated dairy cows, and the effective dry matter, organic matter and protein rumen degradation were calculated at three different fractional outflow rates (0,02; 0,05; 0,08/h). The percentage dry matter, organic matter and protein degradation of triticale (64,1; 64,3; 74%) were significantly higher (p<0,01) than that of maize (31,8; 37,6; 36,6%) when calculated at a fractional outflow rate of 0,08/h. Four dairy concentrates containing different proportions of triticale cereal and maize cereal, as shown in experiment 1 and 2, were used in experiment 4 with 8 Friesian cows early in their second lactation in a double cross-over design. The diets were fed twice daily at 0,5 kg per liter milk produced. 20% alfalfa hay (per DM), 15% wheat straw (% per DM) and 65% oat silage (per DM) were fed ad lib. in a housing unit. Milk fat production with treatment 1 (100 triticale; 0 maize) was significantly lower (p<0,05) than milk fat production with treatments 2; 3 and 4 (0,70 vs 0,97; 0,93 and 0,92 kg/cow/day) respectively. The production of 4% fat corrected milk per dry matter intake with treatment 1 was significantly lower (p<0,05) than production with treatments 2; 3 and 4 (1,41 vs 1,65; 1,66 and 1,67 kg 4% FCM/kg DMI) respectively. Other differences were not of any significance. Experiments 1 and 2 have shown that triticale cereal can replace up to 34% of maize cereal in sheep and steer diets. Experiment 3 has shown that triticale cereal has a higher in situ degradation than maize cereal. Experiment 4 has shown that triticale cereal can replace up to 66% maize cereal in dairy concentrates without any adverse effect on milk production or milk composition. Masters 2012-08-27T12:26:59Z 2012-08-27T12:26:59Z 1991 Thesis http://hdl.handle.net/10019.1/69232 af Stellenbosch University 110 pages : ill. application/pdf Stellenbosch : Stellenbosch University |
| spellingShingle | Ruminants -- Feeding and feeds Dairy cattle -- Feeding and feeds Corn as feed Grain as feed Milk yield Dissertations -- Agriculture Griessel, Andre Die vervanging van mieliegraan met koroggraan in suiwelkonsentrate vir melkbeeste |
| title | Die vervanging van mieliegraan met koroggraan in suiwelkonsentrate vir melkbeeste |
| title_full | Die vervanging van mieliegraan met koroggraan in suiwelkonsentrate vir melkbeeste |
| title_fullStr | Die vervanging van mieliegraan met koroggraan in suiwelkonsentrate vir melkbeeste |
| title_full_unstemmed | Die vervanging van mieliegraan met koroggraan in suiwelkonsentrate vir melkbeeste |
| title_short | Die vervanging van mieliegraan met koroggraan in suiwelkonsentrate vir melkbeeste |
| title_sort | die vervanging van mieliegraan met koroggraan in suiwelkonsentrate vir melkbeeste |
| topic | Ruminants -- Feeding and feeds Dairy cattle -- Feeding and feeds Corn as feed Grain as feed Milk yield Dissertations -- Agriculture |
| url | http://hdl.handle.net/10019.1/69232 |
| work_keys_str_mv | AT griesselandre dievervangingvanmieliegraanmetkoroggraaninsuiwelkonsentratevirmelkbeeste |