Masters Degrees (Faculty of Science (former Departments))

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Browsing Masters Degrees (Faculty of Science (former Departments)) by browse.metadata.advisor "Hoffman, Louwrens C."

Now showing 1 - 6 of 6
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    An exploratory study in the Western Cape on game meat as a consumer product
    (Stellenbosch : Stellenbosch University, 2002-12) Crafford, Karlien; Hoffman, Louwrens C.; Muller, M.; Schutte, De W.; Stellenbosch University. Faculty of Science.
    ENGLISH ABSTRACT: The purpose of this research was to study the current purchasing and marketing behaviour of game meat by supermarkets, butcheries and restaurants in the Western Cape Province, and to investigate perceptions on, purchasing and consumption of game meat by South African consumers and overseas tourists visiting South Africa. Research was done by the survey method with the aid of structured, self-administered questionnaires. Chi-squared frequencies were used to test for significant influences of data. The research showed that South African consumers are poorly educated regarding the nutritional benefits and cooking methods of game meat. Consumers indicated that they would buy game meat if they were better informed on its qualities. Just over 73% of the respondents indicated that they have eaten game meat, whilst 66% of the respondents indicated that they would eat game meat again. South African consumers, however, indicated that they are not willing to pay more for game meat than other meat types. Race and educational level were the only two socio-demographical variables that showed significant differences. White respondents and respondents that were in the "post-High school diploma/degree" educational group, were better informed on game meat and were also more likely to buy game meat than either the black or coloured racial groups. The respondents indicated the leanness of meat as one of the most important quality considerations when they buy meat. This provides an opportunity for game meat marketers to market game meat as a low-fat meat product. This research succeeded in identifying target markets for game meat. Restaurants should market game meat for European tourists, whilst supermarkets and butcheries should focus on marketing game meat to white consumers and consumers with higher educational qualifications, but also target coloured and black consumers. This research confirmed that the South African game meat industry is plagued by numerous misconceptions and contradictions. It is evident that both consumers and marketers of game meat have contradictory beliefs regarding the seasonal availability of game meat. Consumers as well as some of the supermarket, butchery and restaurant meat buyers, are ill-informed regarding the sensory qualities, health benefits and preparation and cooking methods of game meat. Ironically, the research showed that tourists visiting South Africa were the respondent group that were the most knowledgeable regarding the sensory qualities and health benefits of game meat. This research provides a valuable pilot-study into the marketing possibilities of game meat.
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    Meat quality characteristics of blesbok (Damaliscus dorcas phillipsi) and red hartebeest (Alcelaphus buselaphus caama) meat
    (Stellenbosch : Stellenbosch University, 2004-03) Smit, Karen; Hoffman, Louwrens C.; Muller, M.; Stellenbosch University. Faculty of Science.
    ENGLISH ABSTRACT: Please see fulltext for abstract
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    Meat quality characteristics of three South African game species : black wildebeest (Connochaetes gnou), blue wildebeest (Connochaetes taurinus) and mountain reedbuck (Redunca fulvorufula)
    (Stellenbosch : Stellenbosch University, 2004-03) Van Schalkwyk, Sunet; Hoffman, Louwrens C.; Muller, M.; Stellenbosch University. Faculty of Science.
    ENGLISH ABSTRACT: Please see fulltext for abstract
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    Meat quality of raw and processed guinea fowl (Numeda meleagris)
    (Stellenbosch : Stellenbosch University, 2008-12) Tlhong, Tumelo Maud; Hoffman, Louwrens C.; Vosloo, M. C.; Moelich, E.; Mellett, F.; Stellenbosch University. Faculty of Science. Dept. of Consumer Science.
    The purpose of this study was to investigate the chemical composition mineral and cholesterol content of the different cuts (breast, drumstick and thigh) of raw guinea fowl meat. The study also aimed at establishing the effect of cooking method on guinea fowl quality attributes by investigating the effect of different cooking methods on the chemical composition and sensory attributes of the different cuts. The effect of injecting a brine solution on the chemical composition and sensory attributes were also investigated. There were no differences in terms of moisture content of the various cuts raw guinea fowl meat The breast had significantly higher protein content when compared to drumstick and thigh (P<0.05). The fat content was similar for all the cuts (P>0.05). Whilst the drumstick had significantly the lowest value for ash content when compared to the thigh. Saturated fatty acids (SFAs) and total unsaturated fatty acids (TUFAs) were not different (P>0.05) in all the cuts. Drumstick had significantly higher monounsaturated fatty acids compared to other cuts (P<0.05), and it had the highest polyunsaturated fatty acids (P<0.05). The breast had the lowest (P<0.05) n-6 fatty acid value (44.25) and had relatively the lowest Polyunsaturated:Saturated (P:S) fatty acid ratio of 1.74 when compared to the other cuts. High n-6:n-3 ratios, ranging from 7.05 to 16.58, were also found in all the cuts. Cholesterol was lowest (P<0.05) in the breast. Seventeen amino acids were found, including the eight of the nine essential amino acids. Significant differences were found in amino acid values for the different cuts. Values of iron were significantly higher in the drumstick and thigh cuts (P<0.05), whilst drumstick had the highest zinc content of all the cuts (P<0.05). On investigating the effect of three cooking methods (baking-bag, foil-wrap, open-roasting at 140ºC for 65 minutes) on the chemical composition, the open-roasting method produced higher moisture content (P<0.05) consistently for all cuts, with the breast having the highest and the drumstick the lowest (P<0.05). The moisture content of the baking-bag method on the other hand was consistently the lowest (P>0.05). This effect was significant for the breast, which had lost the most moisture (P<0.05). The baking-bag method consistently resulted in a higher protein content, which is attributed to the higher moisture loss (P<0.05) in comparison with the other methods, resulting in a more concentrated product. With regard to the fat content no effect resulting from the cooking methods could be observed (P>0.05), but the cuts’ natural fat content was reflected especially in the open–roasting method (P<0.05) giving further support to the understanding that the open-roasting method indeed made the least inroads on the chemical composition of guinea fowl meat under these restraints: controlled for cooking time and temperature, internal temperature not controlled. All the cuts cooked according to all the methods, had the favourable >0.4 Polyunsaturated:Saturated fatty acids (P:S) ratio, ranging from 0.91 to 1.42 between cuts and treatments. The n-6:n-3 ratio was below the recommended beneficial value, namely <4:1, in all the cuts irrespective of all the cooking methods, ranging from 2.47 to 3.08. The study of the effect of the three cooking methods (baking-bag, foil-wrap and open-roast) on the sensory attributes of the breast meat revealed that aroma-intensity of the three cooking treatments did not differ significantly (P>0.05). Foil-wrap produced a more tender and juicier product (P<0.05), while, when using the baking-bag method, values for flavour decreased (P<0.05). It is proposed that a higher internal temperature (which was not controlled) was attained when using the baking-bag method (temperature and time controlled) resulting in loss of volatile flavour components. The effect of the three cooking methods (baking-bag, foil-wrap and open-roast) on the proximate composition (moisture, protein, fat and ash) of raw and cooked breast meat was investigated. As anticipated raw breast meat had higher moisture content (74.55%, P<0.05) than the cooked cuts, with open-roasting showing the highest (68.55%) value and foil-wrap close second (68.12%). These values differed significantly from the baking-bag method (66.06%, P<0.05). An investigation on the effect of brine infusion on the sensory attributes and chemical composition (proximate and fatty acid composition, and mineral content) of breast meat, baked in foil-wrap, was carried out using descriptive sensory analysis with the injected breast and the control as variable. There were no significant differences (P>0.05) between the injected and the control samples for any of the sensory attributes of aroma, tenderness, initial juiciness, sustained juiciness and flavour. Judge:treatment variations were observed for all the attributes, and samples differed for all attributes except for aroma. It is proposed that the use of the hand injector could not effectively distribute the brine solution, hence the recommendation to repeat the experiment using an electronic multineedle-injector. No effect was observed for the proximate composition (P>0.05). Further research pertaining to cooking methods of meat of free-range guinea fowl is recommended to address certain issues that have been highlighted.
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    Protection of the long chain N-3 polyunsaturated fatty acids in hake head flour against oxidation
    (Stellenbosch : Stellenbosch University, 2003-03) Nolte, Noreen Kathleen; Hoffman, Louwrens C.; Dalton, A.; Stellenbosch University. Faculty of Science. Dept. of Consumer Science.
    ENGLISH ABSTRACT: Please refer to full text for abstract
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    The quality attributes of South African rabbit meat and consumer attitudes towards it
    (Stellenbosch : Stellenbosch University, 2004-03) Nkhabutlane, Pulane; Hoffman, Louwrens C.; Vosloo, M. C.; Schutte, De W.; Stellenbosch University. Faculty of Science. Dept. of Consumer Science.
    ENGLISH ABSTRACT: Meat processing industries in South Africa are faced with the challenge to produce a variety of white meats. This is due to the fact that consumers tend to consume less red meat and more chicken and pork that are perceived to be healthier due to the negative publicity surrounding red meat and health. The nutritional emphasis is on leaner carcasses and an increase in the consumption of polyunsaturated fatty acids while reducing the ratio of n-6:n-3 polyunsaturated fats in the diet. Another way in which this can be achieved is through introducing rabbit meat which has low fat, low cholesterol content and high protein content, while displaying a positive fatty acid profile. Carcass quality and meat quality in rabbits may to a large extent be affected by age of slaughter and type of breed. This study had a dual purpose. Firstly it aimed at quantifying the effects of breed and age on parameters pertaining to carcass quality and meat quality of commercial rabbits, namely California breed and hybrid (California x Dutch red). Secondly, to determine the differences between ethnic groups on their perceptions towards rabbit meat, thereby providing information on its marketing potential. To accomplish the first objective 50 rabbits from the two breeds were housed in individual cages, weighed on weekly basis and fed ad libitum. The rabbits were slaughtered at 9, 11, 13, 15 and 17 weeks of age (n=5 from each breed). For the second objective the perceptions of three ethnic groups on factors affecting consumers' choice of rabbit meat were determined through a structured questionnaire. The questionnaire was tested for validity beforehand. There was no significant difference between the two breeds regarding body weight, feed intake, carcass weight and drip loss. The California breed had a higher dressing percentage (53.7%) and meat yield (29.2%) compared to the hybrid (52.5% and 27.5% respectively). Age treatments showed a highly significant difference on all parameters investigated. Increasing the age proportionately increased the amount of fat, while the moisture content decreased. The California breed exhibited higher percentages of fat compared to the hybrid at all ages of treatment. California breed contained more phosphorus, magnesium and zinc as opposed to the hybrid, the only exception being copper, where the hybrid had higher concentrations. The total fatty acid (169.2 mg/100 g) of the California breed was higher than that of the hybrid (133.5 mg/100 g). As a result there were more saturated fatty acids (55.4 mg/100 g) and monounsaturated fatty acids (62.3 mg/100 g) in the California breed than in the hybrid (44.2 and 45.6 mg/100 g respectively). Both breeds had 67% unsaturated fatty acids. Although there was no significant difference between the P:S ratio of the two rabbit breeds, the values obtained were higher (+0.9) than the value of 0.7. This is an indication that the rabbit meat contains a P:S ratio that could be considered very desirable. The n-6:n-3 ratio for both breeds were high (11.6 for California and 12.7 for hybrid). The cholesterol and amino acid profile of the two breeds were not affected by the type of breed. The consumer survey indicated that 52% (n=158) of respondents had never eaten rabbit meat before due to reasons such as scarcity, lack of knowledge about the meat, associating rabbits with pets and cultural constraints. Nevertheless, 57% of these people were optimistic about eating rabbit meat. In addition, having eaten rabbit meat before seemed to contribute positively towards acceptance of rabbit meat. Generally, respondents preferred purchasing rabbit meat in portions as opposed to live or whole carcasses. Their decision to purchase rabbit meat was firstly driven by price, thereafter freshness, leanness and tenderness of meat. The respondents expect to buy rabbit meat at a price lower than that of chicken. Rabbit meat contained low sodium and high proportion polyunsaturated fatty acids-some of the most important food attributes required to maintain and improve health. However, most of the respondents in this study were not familiar with the positive attributes of rabbit meat and need to be taught the benefits of this product.