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Polidori, P. Camelids' Milk. Encyclopedia. Available online: https://encyclopedia.pub/entry/19995 (accessed on 07 July 2024).
Polidori P. Camelids' Milk. Encyclopedia. Available at: https://encyclopedia.pub/entry/19995. Accessed July 07, 2024.
Polidori, Paolo. "Camelids' Milk" Encyclopedia, https://encyclopedia.pub/entry/19995 (accessed July 07, 2024).
Polidori, P. (2022, February 28). Camelids' Milk. In Encyclopedia. https://encyclopedia.pub/entry/19995
Polidori, Paolo. "Camelids' Milk." Encyclopedia. Web. 28 February, 2022.
Camelids' Milk
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This entry is adapted from the peer-reviewed paper 10.3390/beverages8010012

Camel milk has always represented an important food for nomadic people in the arid parts of the world; recently, camel milk attracted great attention as a possible replacer to dairy cow’s milk because of its therapeutic effects. The use of alternative milk for feeding children can be effective in reducing the development of gastrointestinal disorders.

camel milk dromedary milk nutraceutical foods

1. Introduction

Human milk represents the best food for newborn children, considering its nutritional and immunological properties, and for these reasons, can be considered very safe for infant nutrition [1]. After the infant weaning or early termination of breastfeeding, normally cow milk represents the most common food for infant nutrition but unfortunately can also represent the first allergen in life [2]. In fact, in several countries, cow milk, a member of the “Big Eight” food allergens, together with egg, soy, wheat, peanuts, tree nuts, fish, and shellfish, is the most important food allergen in babies and children [3].
Camel milk has always represented an important food for nomadic people in the arid parts of the world; recently, camel milk attracted great attention as a possible replacer to dairy cow’s milk because of its therapeutic effects [4]. The use of alternative milk for feeding children can be effective in reducing the development of gastrointestinal disorders [5]. Initially, goat milk has been investigated [6]; later, in the 1990s, donkey milk started to stir great interest in clinical trials [7][8]. Recently, the use of camel milk to replace dairy cows and other kinds of milk (goat, donkey, and mare) has attracted interest in the scientific community [9]. Allergic symptoms to cow’s milk proteins can be treated with camel’s milk immunoglobulins (Igs) [10]. The antiallergenic properties of camel milk are also due to having a similar protein profile to human mother’s milk, with the absence of β-lactoglobulin and a high content of α-lactalbumin [11]. Additionally, considering the high content of antioxidant and antimicrobial molecules in camel’s milk, it is possible to detect a crucial role of this milk in many health bodies functions. In fact, camel milk is characterized by an insulin content (42 μU/mL) that is not degraded in the forestomach and bypass to intestines, leading to a reduction in blood glucose levels; therefore, it is effective in diabetes treatment [12]. Camel milk also shows antibacterial and antiviral activities due to having bioactive peptides able to perform important physiological properties, enhancing the immune system defense [13]. For this reason, camel milk is used as a remedy for diarrhea caused by viruses (Rotavirus), and for both B and C hepatitis [14]. Camel milk can be considered a highly suitable vehicle in delivering probiotics and can be useful in maintaining gut health [15].

2. Dromedary and Bactrian Camel Milk

Milk is considered a complete food, very important in the human diet both for children and adults [16]. Milk consumption is estimated at around 85 kg/year/per capita, even if there are large differences among different areas: In developed regions, it is estimated at around 214 kg/year/per capita, while in developing regions, it is around 55 kg/year/per capita [17]. Specifically, in East and Southeast Asia, milk consumption is close to 25 kg/year/per capita, in South Asia, close to 52 kg/year/per capita, in sub-Saharian Africa, about 30 kg/year/per capita, in the Middle East and North Africa, about 87 kg/year/per capita, and in Latin America, it is about 113 kg/year/per capita [18].
Malnutrition is responsible in developing regions for about 55% of children’s deaths under the age of 5 years [19]. The optimal food for infants is human milk; the World Health Organization (WHO) recommends exclusive breastfeeding for the first 6 months, possibly until the first year of life, while infant formula with a chemical composition similar to human milk is the recommended replacer when breastfeeding is not possible [20]. However, after 6 months of age, breast milk alone does not provide enough nutrients to permit a regular growth of the infant; during the transition period from exclusive breastfeeding to the end of breastfeeding, the risk of lack of nutrition is high [21].
Camels are mammals that ruminate, even if they are considered semi-ruminants because they have a stomach with three compartments with digestive physiology similar to ruminants [22]. They belong to the order Artiodactyla, suborder Tylopoda, family Camelidae. Camels originate and live in arid and semi-arid lands, but due to their special thermal regulation, they do not lose water; in fact, camels regulate body temperature on two levels, with a body temperature of about 40 °C in the heat of the day, while during the night, their body temperature falls to 34 °C [23]. Digestion in camel is more effective, compared with other ruminants; high digestibility of dry matter and fiber is due to the longer retention time and movement of large particles in its fore stomach [24].
Table 1 shows the chemical composition of different mammalian species. Female mammals produce specific milk able to completely fulfill the nutritional requirements of the newborn. Milk is not just a source of nutrients, but it is also able to provide peculiar molecules with bioactive functions and contributes to newborn growth and health [25].
Table 1. Milk chemical composition.
Mammal Energy
(kcal/100 g)		 Fat
(g/100 g)		 Protein
(g/100 g)		 Lactose
(g/100 g)
Human 64.2 3.5 1.2 6.4
Donkey 41.8 0.7 1.6 6.6
Cow 76.2 3.8 3.4 4.8
Sheep 115.7 7.0 5.7 4.7
Goat 74.5 4.1 3.3 4.5
Dromedary 66.1 3.1 3.5 4.4
Bactrian camel 88.9 5.3 3.9 4.5
Source: [17].
A female camel can produce from 2 to 25 L of milk per day, depending on the quality and the total amount of food she consumes; the gestation period lasts about 13 months, and lactation ranges between 9 and 18 months [26]. In dairy dromedaries, as well as in donkeys, the udder has small cisterns containing about 19.3% of the total milk [27]. Camel’s milk color is normally white opaque, and it is characterized by a faint sweetish odor but sharp taste; some consumers consider it salty [28]. Camel’s milk acidity has been determined to be 0.144% lactic acid, the mean value of specific gravity has been detected around 1.029, the freezing point has been established at −0.518 °C, and electrical conductivity has been reported to be 6.08 millimhos [29]. However, camel’s milk physical and chemical characteristics are highly influenced by the geographical origin, the camel breed, and obviously by the lactation stage [30].
The somatic cell counts level in camel milk is normally low, compared with dairy cow’s milk; in a study performed in Saudi Arabia, SCC varied from 11,000 to 298,000 cells/mL in farm A, using a milking machine, and from 14,000 cell/mL to 643,000 in farm B using the hand milking method [31]. Regarding bacterial load, in the same study, intramammary infections were detected in 12% of the 84 milk samples collected in farm A and in 37% of the milk samples examined from camels in farm B [32].

3. Protein Fractions in Camel Milk

The total protein content of camel’s milk is represented for about 80% by caseins, while in the remaining 20%, whey contains several soluble proteins and different bioactive peptides generated by camel’s milk proteases such as chymotrypsin A and cathepsin D (Table 2) [33].
Table 2. Protein profile (g/L−1) of milk from different mammalian species.
Protein Fraction Cow Goat Sheep Camel Donkey Human
Total caseins 24.6–28 23.3–46.3 41.8–52.6 22.1–26.0 6.4–10.3 2.4–4.2
Total whey proteins 5.5–7.0 3.7–7.0 10.2–16.1 5.9–8.1 4.9–8.0 6.2–8.3
Caseins/whey proteins ratio 82:18 78:22 76:24 73.2:76.2 56:44 29.7:33.7
αS1-Casein 8.0–10.7 0–13.0 2.4–22.1 4.9–5.7 Present 0.77
αS2-Casein 2.8–3.4 2.3–11.6 6.0 2.1–2.5 Present Absent
β-Casein 8.6–9.3 0–29.6 15.6–39.6 14.4–16.9 Present 3.87
k-Casein 2.3–3.3 2.8–13.4 3.2–12.2 0.8–0.9 Present 0.14
β-Lactoglobulin 3.2–3.3 1.5–5.0 6.5–13.5 Absent 3.3 Absent
α-Lactalbumin 1.2–1.3 0.7–2.3 1–1.9 0.8–3.5 1.9 1.9–3.4
Source: [34].
Amino acid concentrations in milk from different mammalian species are shown in Table 3. In milk from buffalos, cows, and horses, cysteine and methionine are the limiting amino acids, while lysine is the limiting amino acid in camel milk; it is interesting to note that camel milk contains more methionine, valine, phenylalanine, arginine, and leucine, compared with cow milk [35].
Table 3. Amino acid concentrations (g/100 g protein) in milk from different mammalian species.
Amino Acid Cow Sheep Goat Camel Donkey Human
Aspartic acid 7.8 n.d. 7.4 6.9 8.9 8.3
Threonine 4.5 4.2–4.4 5.7 4.1 3.6 4.6
Serine 4.8 n.d. 5.2 4.3 6.2 5.1
Glutamic acid 23.2 n.d. 19.3 18.1 22.8 17.8
Proline 9.6 n.d. 14.6 12.0 8.8 8.6
Cysteine 0.6 0.8–0.9 0.6 1.9 0.4 1.7
Glycine 1.8 n.d. 2.1 2.1 1.2 2.6
Alanine 3.0 n.d. 3.6 2.1 3.5 4.0
Valine 4.8 6.2–6.4 5.7 4.1 6.5 6.0
Methionine 1.8 2.7 3.5 2.0 1.8 1.8
Isoleucine 4.2 4.6 7.1 4.9 5.5 5.8
Leucine 8.7 9.7–9.9 8.2 6.1 8.6 10.1
Tyrosine 4.5 3.7–3.8 4.8 3.1 3.7 4.7
Phenylalanine 4.8 4.2–4.3 6.0 4.0 4.3 4.4
Histidine 3.0 n.d. 5.0 2.1 2.3 2.3
Lysine 8.1 7.7–7.8 8.2 4.0 7.3 6.2
Arginine 3.3 n.d. 2.9 2.0 4.6 4.0
Tryptophan 1.5 n.d. n.d. n.d. n.d. 1.8
Limiting amino acid Cysteine
Methionine		 ---- ---- Lysine Cysteine
Methionine		 ----
Source: [35]; n.d.: not detected.

4. Lipid Fractions in Camel Milk

Human milk fat, compared with ruminants’ milk, is characterized by lower content of saturated fatty acids (SFAs), higher content of both monounsaturated fatty acids (MUFAs) and polyunsaturated fatty acids (PUFAs), a higher ratio ω-6/ω-3 essential fatty acids, and higher cholesterol content; the conjugated linoleic acid (CLA) content is similar in human and ruminant milk (Table 4).
Table 4. Fatty acid profile (% of total fatty acids) and cholesterol content in milk of different mammalian species.
Fatty Acids Cow Sheep Goat Camel Donkey Human
SFA (%) 55.7–72.8 57.5–74.6 59.9–73.7 47.0–69.9 46.7–67.7 39.4–45.0
MUFA (%) 22.7–30.3 23.0–39.1 21.8–35.9 28.1–31.1 15.3–35.0 33.2–45.1
PUFA (%) 2.4–6.3 2.5–7.3 2.6–5.6 1.8–11.1 14.2–30.5 8.1–19.1
ω6/ω3 2.1–3.7 1.0–3.8 4 n.d. 0.9–6.1 7.4–8.1
CLA (%) 0.2–2.4 0.6–1.1 0.3–1.2 0.4–1.0 n.d. 0.2–1.1
Cholesterol
(mg/100 mL milk)		 13.1–31.4 14.0–29.0 10.7–18.1 31.3–37.1 n.d. 14.0–20.0
Source: [35]; n.d.: not detected.

5. Minerals and Vitamins in Camel Milk

Calcium, phosphorus, and potassium are the most represented minerals in milk, which are basically designed for bone growth and the proper development of newborns, while iron, zinc, and copper are present in small amounts, except camel milk, which is the richest in these minerals (Table 5).
Table 5. Mineral concentrations in milk from different mammalian species.
Macroelements (mg/100 g) Cow Sheep Goat Mare Camel Human
Calcium 122.0 195–200 132–134 132.7 114–116 33.0
Phosphorus 119.0 124–158 97.7–121 88.4 87.4 43.0
Potassium 152.0 136–140 152–181 66.5 144–156 55.0
Magnesium 12.0 18–21 15.8–16.0 10.2 10.5–12.3 4.0
Sodium 58.0 44–58 41–59.4 19.8 59.0 15.0
Microelements (µg/100 g)            
Zinc 530.0 520–747 56–370 270.0 530–590 380.0
Iron 80.0 72–122 7.0–60 37.0 230–290 200.0
Copper 60.0 40–68 5.0–80.0 64.0 140.0 60.0
Manganese 20.0 5.3–9.0 3.2–6.53 n.d. 80.0 70.0
Iodine 2.1 10.4 2.2 n.d. n.d. 7.0
Selenium 0.96 3.1 1.33 n.d. n.d. 1.52
Source: [35]; n.d.: not detected.
Vitamins are organic molecules necessary to the body in small amounts but cannot be synthesized by the body [36]. The dose of vitamins required for growth and body health differs between species. A vitamin necessary in the diet of one species may be regularly synthesized by other species. For example, vitamin C is required only in diets for primates and guinea pigs; other animal species can synthesize ascorbic acid because they have the enzyme gluconolactone oxidase, necessary for vitamin C synthesis. Vitamins may be classified based on their solubility: Water-soluble vitamins are the B group B1, B2, B3, B5, B6, B8, B9, B12, and ascorbic acid (vitamin C) while the fat-soluble vitamins are retinol (vitamin A), calciferol (vitamin D), tocopherol (and related compounds, vitamin E), and phylloquinone (and related compounds, vitamin K). Vitamin C and vitamin E are primarily antioxidants. Goat milk is rich in vitamin A and some from the vitamin-B group, but it shows a significantly lower amount of vitamin B12 and folic acid, compared with dairy cow’s milk (Table 6). Camel milk is characterized by a higher concentration of vitamin C, compared with dairy cows and human milk [37][38]. In fact, in desert areas, fruits and vegetables are scarce, so camel milk represents, in most cases, the main source of vitamin C in the diet of nomadic populations living in those regions [39].
Table 6. Vitamin contents in milk from different mammalian species.
Vitamin Goat Sheep Cow Camel Human
Vitamin A (µg/100 g) 185 146 126 26.7 190
Vitamin D (µg/100 g) 2.3 1.18 2.0 0.3 1.4
Vitamin B1 (mg/100 g) 0.07 0.08 0.05 0.05 0.02
Vitamin B2 (mg/100 g) 0.21 0.38 0.16 0.17 0.02
Vitamin B3 (mg/100 g) 0.27 0.42 0.08 0.77 0.17
Vitamin B5 (mg/100 g) 0.31 0.41 0.32 0.37 0.20
Vitamin B6 (mg/100 g) 0.05 0.08 0.04 0.55 0.01
Vitamin B8 (µg/100 g) 1 5 5 87 5.5
Vitamin B9 (µg/100 g) 1.5 0.93 2 n.d. 0.4
Vitamin B12 (µg/100 g) 0.07 0.71 0.36 85 0.03
Vitamin C (mg/100 g) 1.29 4.16 0.94 33 5.0
Source: [35]; n.d.: not detected.

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