This review summarises current knowledge on camel milk proteins, with focus on significant peculiarities in protein composition and molecular properties. Camel milk is traditionally consumed as a fresh or naturally fermented product. Within the last couple of years, an increasing quantity is being processed in dairy plants, and a number of consumer products have been marketed. A better understanding of the technological and functional properties, as required for product improvement, has been gained in the past years. Absence of the whey protein β-LG and a low proportion of к-casein cause differences in relation to dairy processing. In addition to the technological properties, there are also implications for human nutrition and camel milk proteins are of interest for applications in infant foods, for food preservation and in functional foods. Proposed health benefits include inhibition of the angiotensin converting enzyme, antimicrobial and antioxidant properties as well as an antidiabetogenic effect. Detailed investigations on foaming, gelation and solubility as well as technological consequences of processing should be investigated further for the improvement of camel milk utilisation in the near future.

This experiment was conducted to investigate the effect of starter cultures on the physicochemical properties, texture, and consumer preferences of soft white cheese (SWC) made from camel (Camelus dromedarius) milk. The experiment was laid out in a completely randomized design with 5 treatments [starter cultures; i.e., 1 thermophilic (STI-12), 2 blended (RST-743 and XPL-2), and 2 mesophilic cultures]. Starter cultures STI-12 and RST-743 were inoculated at 37°C, whereas XPL-2, R-707, and CHN-22 were inoculated at 30°C. Camel milk inoculated using STI-12 and RST-743 cultures resulted in faster acidification than XPL-2, R-707, and CHN-22 cultures. Camel milk SWC made using STI-12 and CHN-22 cultures gave lower pH (4.54) and titratable acidity (0.59), respectively, whereas R-707 culture resulted in high cheese yield (13.44 g/100 g). In addition, high fat (20.91 g/100 g), protein (17.49 g/100 g), total solids (43.44 g/100 g), and ash (2.40 g/100 g) contents were recorded for SWC made from camel milk made using RST-743 culture. Instrumental analysis of cheese texture revealed differences in resistance to deformation in which camel milk SWC made using RST-743 culture gave higher firmness (3.20 N) and brittleness (3.12 N). However, no significant difference was observed among camel milk SWC adhesiveness made using different starter cultures. Consumer preference for appearance, aroma, taste, and overall acceptances of SWC were affected by inoculation of starter cultures. Considering curd firmness, cheese yield, compositional quality, and textures using STI-12, RST-743, and R-707, these cultures were found to be better for the manufacture of camel milk SWC.

Protein degradation, rheological properties, sensory properties and the aroma profile of soft brined cheese made from camel milk using two levels of coagulant (camel chymosin) [55 and 85 International Milk Clotting Units (IMCU) L-1 ] and two levels of brine (2% or 5% NaCl, w/w) were investigated over a ripening period of 60 d. Casein degradation in soft brined camel milk cheese significantly (p < 0.05) increased during ripening and with increase of coagulant level. Young's modulus and stress at fracture significantly (p < 0.05) increased with increasing level of salt in moisture in the cheese during ripening. However, cheese made with 85 IMCU L-1 coagulant resulted in softening of cheese texture and higher salt uptake. Using descriptive sensory analysis, the experimental cheeses were described as salty, sour and firm. The volatile aroma compounds formed in soft ripened camel milk cheese are affected by ripening time, and coagulant and NaCl levels.

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Effect of temperature (T), pH and chymosin (CHY-MAX ® M) concentration (CC) on caseinomacropeptide (CMP) release and gelation of camel milk was studied. Results revealed significant (p< 0.05) effects of T, pH and CC on the rate of -casein (-CN) hydrolysis and the interaction between T and CC significantly (p<0.05) affected gel development. A high level of CC (85 IMCU L -1 ) and T (40°C) was needed to obtain satisfactory gelation parameters and in all cases > 95 % CMP was found to be released from the casein (CN) micelle prior to aggregation.The -CN hydrolysis rate has a negative correlation of 0.693 with tg Fig 2. Gelation time (t g ) of camel milk as a function of T and CC. … (30°C) & ─ (40 °C). . Fig 3. Storage module development at different T and CC. ■ 30 °C & ■ 40 °C. CONCLUSIONMore than 95% of the CMP has to be released from the -CN of camel milk for the aggregation and gel formation to commence. The time of gelation was shown to be mainly affected by temperature (tg shorter at 40 than 30 °C ) and by using a higher CC (85 IMCU L -1 ) a comparable G'∞ was obtained irrespective of temperature. REFERENCES1.

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Article InformationAn experiment was conducted to evaluate the effect of inclusion of dried Cafeteria leftover (DCLO) at various levels in concentrate mix (CM) on feed intake, digestibility, average daily gain (ADG), feed conversion ratio (FCR), carcass characteristics, and economic benefits of weaned pigs at Haramaya university piggery. Twenty Yorkshire pigs with initial live weight of 19.89±0.297kg (mean±SE) were randomly assigned to four dietary treatments in a completely randomized block design each with five replicates. The experimental rations were sole CM (mixture of maize grain, wheat short, wheat bran, noug seed cake, soybean mill, vitamin premix and salt), replacement of the concentrate with DCLO at different proportions as (33%CM and 67% DCLO; 67% CM and 33% DCLO) and feeding with only sole DCLO. The mean feed intake ranged 1.6-1.82kg/day and ADG was 0.4-0.64kg/day. The least feed intake was for sole DCLO (P<0.05) and the highest for 67% CM:33%DCLO. The FCR (w/w) was lowest (P<0.05) for pigs fed 33% DCLO diet, and pigs fed 67% DCLO:33%CM achieved highest FCR. Crude protein digestibility did not differ between treatments, but DM, EE and CF digestibility increased with increasing level of DCLO in the diets. The mean carcass weight (43.7kg-57.02kg) was highest in 67% CM but lowest in sole DCLO. Back fat thickness (2.4cm-3.2cm (SEM=±0.03)) was lowest in sole CM but highest in sole DCLO. The highest and lowest (P<0.05) rib eye area (23.9 cm 2 -31.9cm 2 (SEM=±0.81)) were recorded for sole CM and sole DCLO, respectively. Cost of feed per kg weight gain was declined significantly (P<0.01) with increasing level of DCLO. Despite the lower production cost of sole DCLO groups, the pigs showed lower performance and this must have contributed to lowest net return of the groups. Thus, it is concluded that DCLO can replace the conventional concentrate mix up to 67% without adverse effect on pig performance.

HIGHLIGHTS Moisture, total ash, and crude fat of the bread samples were ranged from 12.16 to 28.38%, 0.77 to 2.33%, and 0.41 to 1.87%, respectively.  Dietary fiber, crude protein, and carbohydrate of the bread samples were ranged from 0.13 to 1.36%, 8.01 to 14.34%, and 54.83 to 76.99%, respectively.  Calcium, iron, and zinc levels were ranged from 11.1 to 22.0, 1.2 to 12.5, and 0.7 to 2.1 mg/100 g, respectively.  Some wheat bread sampled from Bahir Dar City did not meet the bread quality standards. ABSTRACTBackground: So far, there is paucity of information about quality of breads available in Ethiopian bakeries. The aim of this study was to assess the proximate composition and some selected nutrient composition of wheat breads baked in Bahir Dar City, Ethiopia. Methods: Totally, 54 fresh loaves of wheat bread were randomly taken from 18 bakeries (three from each one) in Bahir Dar City, Ethiopia. Then, the proximate composition and mineral contents of the samples were determined. Results: The results of the analysis revealed that the proximate compositions were ranged from 12.16 to 28.38%, 0.77 to 2.33%, 0.41 to 1.87%, 0.13 to 1.36%, 8.01 to 14.34%, and 54.83 to 76.99% for moisture, total ash, crude fat, dietary fiber, crude protein, and carbohydrate, respectively. In addition, the level of calcium, iron, and zinc were ranged from 11.1 to 22.0, 1.2 to 12.5, and 0.7 to 2.1 mg/100 g, respectively. Conclusion: Some wheat bread sampled from Bahir Dar City did not meet the bread quality standards parameters. So, it is necessary to design supervision mechanisms to enforce the local bakeries to select the suitable ingredients and produce bread with the required composition.