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  Effekten af udviklingstrin og donorkøernes diæt på nedbrydningsskarakteristikken af rødkløver- og hvidkløverensilage målt in vitro og in sacco
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 Ophav:
Berglund, Nina Louise1, Forfatter
Nørgaard, Peder1, Vejleder
Weisbjerg, Martin1, Vejleder
Tilknytninger:
1Det Biovidenskabelige Fakultet, København, Danmark, diskurs:18              
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 Abstract: Red and white clover silage has been shown to increase feed intake and consequently milkproduction in high yielding dairy cows when compared to grass. This is thought to be due toa higher degradation rate in the rumen explained by chemical characteristics specific for legumes.Characteristics which change over time in relation to the maturity stage of the plant.In connection with the introduction of the new Nordic feed evaluation system NorFor Plan ithas become relevant to estimate the degradation rate of potential digestible NDF (kdDNDF)for red and white clover silage harvested at different maturity stages since results in thisarea are limited. Furthermore, it would be interesting to investigate how the gas productionkinetics of these substrates was affected by clover type and maturation stage. Since the degradationrate is affected by the microbial activity in the rumen, it would also be interestingto investigate how the diet of donor cows affected the gas production kinetics.The degradation rate of digestible NDF was estimated using the in sacco method and the gasproduction kinetics was investigated in vitro by using a novel, wireless, automated systemwith rumen fluid from four jersey cows fed the same clover silages that was being investigatedin vitro. The data from both experiments were fitted to a exponential model P = a +b(1-e^(-ct)).The degradation rate of the potential digestible NDF fraction was highest for early cut whiteclover and lowest for late cut red clover and was negatively correlated to the NDF-content(R2=0.8). The gas production rate was affected by both clover type and maturation stage butwith the greatest influence from white clover that increased gas production rate with 34 %.Feeding the donor cows with white clover silage increased gas production rate by 15 % comparedto red clover.In conclusion, the experiments showed that the primary factor affecting degradation rateand gas production rate was the clover type. White clover had the highest degradation rateand gas production rate due to its low NDF content. With regards to the donor cow diets, itwas also white clover that resulted in the highest gas production rate caused by a high proteinlevel which increased the microbial activity in the rumen fluid.
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Speciale__NLBerglund.pdf (Hovedtekst)
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Basal

Bogmærk denne post: https://diskurs.kb.dk/item/diskurs:19162:2
 Type: Speciale
Alternativ titel: In vitro gas production and in sacco degradation characteristics of red and white clover silage harvested at two stages of maturity in relation to the influence of donor cow die
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Detaljer

Sprog: Danish - dan
 Datoer: 2008
 Sider: 135 pages
 Publiceringsinfo: København, Danmark : Institut for Basal Husdyr- og Veterinærvidenskab
 Indholdsfortegnelse: -
 Note: Agricultural Science, Agronom
 Type: Speciale
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