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THE EFFECT OF DIFFERENT ENERGY AND NITROGEN

SOURCES ON IN VITRO FIBRE DIGESTION OF HIGH AND

LOW QUALITY ROUGHAGES

by

Mari Strauss

Dissertation presented for the degree ofMasters in the Faculty of Animal science at

Stellenbosch University

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98 McCullough, M. 1968. Influence of hay or silage and ratio of flaked corn or beet pulp to

forage on cellulose disappearance in vitro. J. Anim. Sci. 27, 780–784.

Miron, J., Yosef, E., Ben-Ghedalia, D., Chase, L., Bauman, D. & Solomon, R. 2002. Digestibility by dairy cows of monosaccharide constituents in total mixed rations containing citrus pulp. J. Dairy Sci. 85, 89–94.

Mould, F., Orskov, E. & Mann, S. 1983. Associative effects of mixed feeds. I. Effects of type and level of supplementation and the influence of the rumen fluid pH on

cellulolysis in vivo and dry matter digestion of various roughages. Anim. Feed Sci.

Technol.10, 15–30.

Olson, K., Cochran, R., Jones, T., Vanzant, E., Titgemeyer, E. & Johnson, D. 1999. Effects of ruminal administration of supplemental degradable intake protein and starch on utilization of low-quality warm-season grass hay by beef steers. J. Anim.

Sci. 77, 1016–1025.

Poorkasegaran, S. & Yansari, A. T. 2014. Effects of different sources of carbohydrates on intake, digestibility, chewing, and performance of Holstein dairy cows. J. Anim.

Sci. and Biotechnology 5, 6.

Souza, M. A., Detmann, E., Paulino, M. F., Sampaio, C. B., Lazzarini, Í. & Valadares Filho, S. C. 2010. Intake, digestibility and rumen dynamics of neutral detergent fibre in cattle fed low-quality tropical forage and supplemented with nitrogen and/or starch. Trop. Anim. Health Pro. 42, 1299–1310.

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