Oat silage in milk production systems in the Western Cape
Stellenbosch : Stellenbosch University, 2002
Online
Hochschulschrift
Zugriff:
Thesis (MScAgric)--Stellenbosch University, 2002.
ENGLISH ABSTRACT: The objectives of this study were to determine the effects of supplementing oat silage (OS) with lucerne (LH) and oat hay (OH) on the production performance of lactating Jersey cows, as well as comparing the ruminal degradability of LH, OH and OS III Holstein and Jersey cows receiving a high forage diet and a high concentrate diet. In the first trial, five diets containing different combinations of OS and LH together with concentrate mixtures providing 26, 23, 20, 17 and 14% crude protein (CP) were fed to lactating Jersey cows. Lucerne hay was fed at 0, 2, 4, 6, and 8 kg DM/day while OS was fed ad libitum. Cows receiving only OS as a forage source had a lower (P0.05) between treatments. In the second trial, OS was fed with OH and a concentrate mixture containing 26% CP to lactating Jersey cows. Oat hay was fed at 0, 2, 4, 6, and 8 kg DMiday while OS was fed ad libitum. Cows that received OS together with 4 and 6kg OH, respectively had higher (PO.05) between treatments. The ruminal degradability of LH, OH and OS in Holstein and Jersey cows receiving (i) a high forage and (ii) a high concentrate diet was determined. The two breeds were also compared in terms of rumen pH levels, volatile fatty acids (VF A) and rumen ammonia nitrogen (NH3-N) concentrations as affected by time after feeding. The ruminal degradability of freeze dried (FD), oven dried (OD) and fresh oat silage (FS) in Jersey cows receiving a high forage diet was also determined. The ruminal DM, CP and NDF degradability of LH was higher (P
AFRIKAANSE OPSOMMING: Die doel van hierdie studie was om die effek van die aanvulling van hawerkuilvoer met lusemhooi (LH) en hawerhooi (HH) op die melkproduksie van Jerseykoeie te bepaal. Hiermee saam is die rumen degradeerbaarheid van hawerkuilvoer en lusemhooi ondersoek in Jersey en Holsteinkoeie wat 'n hoe-ruvoer en 'n hoe-kragvoer gebaseerde dieet ontvang het. In die eerste proef is vyf diete met verskillende peile van hawerkuilvoer en lusernhooi saam met kragvoere van verskillende ruproteienpeile (26, 23, 20, 17 en 14% RP) aan 10 lakterende Jerseykoeie gevoer. Hawerkuilvoer is ad libitum voorsien en lusemhooi is teen vlakke van 0, 2, 4,6 en Skg droemateriaal (DM) per dag gevoer. Die DM-inname en melkproteienproduksie van koeie wat hawerkuilvoer as die enigste ruvoerbron ontvang het, was laer (P0.05). In die tweede proef is hawerkuilvoer saam met hawerhooi (soortgelyk as Proef 1) gevoer. Die kragvoerkomponent van al die ruvoerkombinasies het 26% RP bevat. Die koeie wat hawerkuilvoer en 4 of 6kg hawerhooi as ruvoere ontvang het, het hoer (PO.05). Die rumendegradeerbaarheid van lusemhooi, hawerhooi en hawerkuilvoer is bepaal in Holstein en Jerseykoeie wat (i) 'n hoe ruvoer- en (ii) 'n hoe kragvoerdieet ontvang het. Die rumen pH, vlugtige vetsuur en rumen-ammoniakkonsentrasies, soos beinvloed deur tyd na voeding, is ook tussen rasse vergelyk. Die rumendegradeerbaarheid van vars, oondgedroogde en vriesgedroogde hawerkuilvoer is ook bepaal. Die rumen DM, RP en NDF degradeerbaarhede van lusemhooi was hoer (P
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Oat silage in milk production systems in the Western Cape
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Autor/in / Beteiligte Person: | Bangani, N. M. (Noluvuyo Muriel) |
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Veröffentlichung: | Stellenbosch : Stellenbosch University, 2002 |
Medientyp: | Hochschulschrift |
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