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'n Vergelyking van Bana met Kikoejoe en Voersorghum ten opsigte van voedingswaarde en opbrengs deur middel van beeste

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dc.contributor.advisor Meissner HH, Prof en
dc.contributor.advisor Rethman NFG, Prof en
dc.contributor.author Koster HH en
dc.date.accessioned 2016-09-26T06:26:36Z
dc.date.available 2016-09-26T06:26:36Z
dc.date.submitted 1991 en
dc.identifier.uri http://hdl.handle.net/20.500.11892/173895
dc.description.abstract Bana (Pennisetum purpureum x P americanum) was compared with kikuyu (Pennisetum clandestinum) and fodder sorghum (Sorghum bicolor) with respect to seasonal growth and dry matter (DM) production under irrigation. Additionally, yield and chemical composition of bana at different stages of regrowth and different stages of the growing season were studied, using cut samples from exclosures. DM yield of bana at 23,2 ton/ha, was not significantly higher than kikuyu at 20,2 ton/ha, but both yields were highly significantly (p≤0.01) more than the 6,8 ton/ha of fodder sorghum. The lower yield of fodder sorghum in this study could probably be ascribed to a lower sowing rate (15 kg/ha in comparison to the recommended 25-30 kg/ha) and lower fertilization rates. For bana and kikuyu highest DM productions were realized during early autumn, while a decline was observed with fodder sorghum during the growing season. Leaf stem ratio of bana was higher during early summer compared to late summer, but the decline with days of regrowth was about the same. The higher leaf stem ratio was reflected in lower cell wall content, but the lower cell wall content did not coincide with higher digestibility. This suggests that cell wall digestibility of bana stems was equal to, or more than, cell wall digestibility of bana leaves. DM yields at 40 days regrowth were at least twice those realized at 30 days regrowth. Since nutritive values were still satisfactory at 6 weeks regrowth but not at 12 weeks regrowth, it is proposed that the optimum grazing stage for bana should be between 40 and 50 days regrowth. Bana was also compared with kikuyu and fodder sorghum with respect to nutritive value as selected by four oesophageally fistulated steers. Hand cut samples of the three forages were, furthermore, compared with fistula samples for certain quality parameters. No significant difference (p≤0.05) was found in the in vitro digestible organic matter (IVDOM) and nitrogen (N) content of hand cut and fistula samples, but acid-detergent-fibre (ADF) and neutral- detergent-fibre (NDF) values differed highly significantly (p≤0.01). Leaf stem ratios of material were significantly (p≤0.05) lower after grazing than before but pastures and seasons differed proportionally. Kikuyu contained more N throughout the growing season than bana and fodder sorghum (p≤0.01), while the IVDOM of fodder sorghum was highly significantly (p≤0.01) less than that of bana and kikuyu. Seasonal trends were significant on occasions. Kikuyu contained less cell wall (NDF) (p≤0.05) than bana and fodder sorghum but the disappearance of NDF from nylon bags only differed significantly between kikuyu and fodder sorghum. Organic matter intake (faeces voided measured by faecal bags) was consistently in the order of bana > fodder sorghum > kikuyu, with the difference between bana and kikuyu significant (p≤O.05). It was concluded that the general assumption in the literature that the "Pennisetum" hybrids, based on napier, are soft and palatable, may be true for bana as well. en
dc.language Afrikaans en
dc.subject Agriculture en
dc.subject Plant production en
dc.title 'n Vergelyking van Bana met Kikoejoe en Voersorghum ten opsigte van voedingswaarde en opbrengs deur middel van beeste en
dc.type Masters degree en
dc.description.degree MSc(Agric) en

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