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Browsing Natural and Agricultural Sciences by Supervisor "Erasmus, L.J. (Lourens Jacobus)"
Now showing items 1-20 of 42
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(University of Pretoria, 2017)Through the measurement of grinding energy, the possibility exists to predict forage fragility as related to the chemical composition of forages. It is also possible to predict a potential relationship between forage ...
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(University of Pretoria, 2014)The structural organization of plant organs and tissues determine the intake potential through the ease of forage particle breakdown, the nature of the particles produced as well as the rate of passage from the rumen. The ...
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(University of Pretoria, 2012)Rumen protected methionine has been used in an effort to improve the amino acid composition of metabolisable protein since the early 1960’s. The positive response in dairy cows in terms of milk protein composition and milk ...
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(University of Pretoria, 2017)The Food and Agriculture Organization (FAO) stated that it is vital to intensify animal and feed production in a sustainable manner. Producers are therefore increasing focus on methods to improve production efficiency. ...
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(University of Pretoria, 2015)As feed costs continue to rise, new technologies that will improve feed efficiency in a safe and consistent manner will become more critical for beef cattle production. With this in mind, two experiments were conducted. ...
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(University of Pretoria, 2011-11-21)Within the South African feedlot industry, there are currently several different roughage sources available for use in feedlot finishing diets. To evaluate the influence of dietary energy and fibre source on rumen function ...
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(University of Pretoria, 2020)The performance of grazing dairy cows, when supplemented with high levels of a maize-based concentrate, could potentially be improved in terms of higher milk and milk protein production by improving the essential amino ...
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(University of Pretoria, 2022-07)The objective of this study was to evaluate the effect of rumen undegradable protein (RUP) and rumen protected lysine (RPLys) and methionine (RPMet) supplementation on growth performance, blood parameters and carcass ...
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(University of Pretoria, 2013)viii SUMMARY The effect of essential oils and calcified marine algae as natural alternatives to ionophore antibiotics on performance of feedlot cattle by Emile Francois Haasbroek Supervisor: Prof. L.J. Erasmus Department: ...
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(University of Pretoria, 2020)The focus of this study was to determine the effect of exogenous enzyme supplementation on rumen fermentation parameters, since a healthy or improved rumen environment favors more efficient growth performance and contributes ...
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(University of Pretoria, 2019)Four late-lactation Holstein-Friesian cows were utilised in a 4 x 4 Latin square design experiment to evaluate the effect of a calcareous marine algae buffer, Acid Buf 10 (Celtic Sea Minerals), a direct-fed microbial ...
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(University of Pretoria, 2009-09-15)Thirty high-producing multiparous Holstein cows were used in a completely randomized block design to compare a lysine deficient total mixed ration, which was sufficient in methionine, to the same diet supplemented with a ...
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(University of Pretoria, 2011-11-18)Energy is the first-limiting nutrient for cows grazing pasture therefore, energy supplementation is necessary for high producing animals. In pasture-based systems, the concentrate is fed twice a day in the dairy parlour ...
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(University of Pretoria, 2008-09-23)Rumen acidosis is a metabolic disorder of ruminants, characterized by a severe drop in rumen pH. This is due to an accumulation of acids, especially lactic acid in the rumen. Lactic acid is one of the strongest acids with ...
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(University of Pretoria, 2017)The overall aim of the study was to study the effects of starch and urea supplementation on roughage intake, digestibility, and microbial nitrogen synthesis (MNS) in sheep fed low-quality Eragrostis curvula hay (< 3% CP, ...
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(University of Pretoria, 2013)Ruminant feed supplements are price sensitive and are effected by the continuous fluctuation of other raw material feed prices. Therefore, improving the efficiency of production and reducing cost of supplement concentrates ...
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(University of Pretoria, 2020)The importance of protein quality in the formulation of ruminant rations has been regarded as inconsequential in the past. Moreover, the use of agro-industrial by-products as feed ingredients have become attractive ...
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(University of Pretoria, 2009-04-15)Published research suggests that it might be beneficial to increase the amount of rumen undegradable protein (RUP) that passes out of the rumen, through manipulation of rumen fermentation to establish a lower rumen pH. To ...
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(University of Pretoria, 2016)As supplies of canola meal (CM) and dried distiller s grains (DDGS) increase, so does the incentive to use these feeds as protein supplements at higher inclusion levels in dairy cattle rations. However, this could have ...
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(University of Pretoria, 2019)Interest in alternative rumen fermentation modifiers has increased significantly since the ban of antibiotic growth promoters in 2006 by the European Union. The use of live yeast in ruminant feed is nothing new, but the ...
Now showing items 1-20 of 42