Chemical composition of mare colostrum and milk
Chemical composition of mare’s colostrum and milk is shown in (Table 1). The results showed that mare colostrum had higher (P<0.0001) SNF (11.94 vs. 10.24), protein (4.56 vs. 3.80) and lactose (6.66 vs. 5.56) but similar fat contents (2.45 vs. 2.46) compared to mare’s milk, respectively. Moreover, the Brix value (%) of immunoglobulin content in mare’s colostrum is 18.0%.
Body weight, rectal temperature, SPO2 and pulse rate
Changes of rectal temperature, pulse rate and SPO2 among control, mare’s colostrum and milk groups, fresh and cold-stored, are presented in Table 2. The rectal temperature (
oC), pulse rates and SPO2 values did not differ among control, mare’s colostrum and milk groups, fresh and cold-stored groups.
Monitoring blood glucose levels
Blood glucose values (mg/dl) per day of mice consuming fresh and cold-stored mare’s colostrum and milk are presented in (Fig 2). There were no significant differences in blood glucose levels between any of the groups at the start of the experiment (day 0). The control group’s glucose levels remained relatively stable over the four days of experiment. All groups had similar starting glucose levels around 133-135 mg/dl (day 0). At day 1, the fresh mare’s colostrum group showed the lowest blood glucose value (P<0.0001) followed control and by mare’s milk groups, respectively. At day 2, day 3 and day 4, mare’s colostrum and milk cold-stored were given to mice. The blood glucose values were the highest (P<0.0001) in cold-stored mare’s milk group followed by cold-stored colostrum compared to control group at day 3 and day 4.
The results of the current experiments are shown in (Fig 2) and (Table 1-2) indicating the chemical composition of mare’s colostrum and milk and their effects in fresh or cold-stored states on physiological parameters and blood glucose profiles. The obtained results showed potential effects of fresh mare’s colostrum in decreasing blood glucose values compared to mare’s milk and control groups (Fig 2). Mare’s milk is still not widely recognized globally despite its established use in Asian diets. The growing interest of mare’s milk in Western Europe and the USA is primarily due to its suitability for individuals with allergies
(Dankow et al., 2012; Pieszka et al., 2016; Blanco-Doval et al., 2024).
Chemical composition of mare’s colostrum and milk
Chemical composition of mare’s colostrum and milk is shown in (Table 1). The results showed that mare colostrum had higher (P<0.0001) SNF (11.94 vs. 10.24%), protein (4.56 vs. 3.80%) and lactose (6.66 vs. 5.56%) but similar fat contents (2.45 vs. 2.46) compared to mare’s milk, respectively. Moreover, the Brix value (%) of immunoglobulin content in mare’s colostrum is 18.0%. This result is consistent with other studies (
Csapó et al., 1995;
Santos et al., 2005; Barreto et al., 2020; Blanco-Doval et al., 2024). Mare’s colostrum, the initial secretion following parturition, differs significantly from mature milk
(Barreto et al., 2020; Polidori et al., 2022). These compositional variations underscore colostrum’s vital role in providing essential immune protection and concentrated nutrients to the newborn foal, facilitating its transition to extra-uterine life. Colostrum has a dry matter much higher than milk (11.94 vs. 10.24%), especially the high protein content which composed of 80.0% immunoglobulins (
Csapó et al., 1995). Colostrum has about 20.0% higher fat content than milk fat, which produced in the initial third of lactation stage
(Pecka et al., 2012). In addition, bioactive peptide precursors, such as α-lactoalbumin and β-lactoglobulins are present in colostrum in considerable quantities
(Fessas et al., 2001).
Rectal temperature, pulse rate and peripheral oxygen saturation
Changes of rectal temperature, pulse rate and SPO2 among control, mare’s colostrum and milk groups, fresh and cold-stored, are presented in Table (2). The rectal temperature (
oC), pulse rates and SPO2 values were not differed among control, mare’s colostrum and milk groups, fresh and cold-stored groups. This could be attributed to the body’s robust thermoregulatory system actively works to maintain a stable core temperature, overriding minor fluctuations that might be caused by food or drink intake. In addition, due to the short period of experiment, colostrum and milk substances don’t directly provide significant amounts of substances that would immediately alter respiratory function or oxygen-carrying capacity of the blood in healthy mice. Hence, consumption of mare’s colostrum and milk is unlikely to trigger a rapid and significant change in pulse rate in healthy individuals.
Blood glucose levels
Blood glucose values per day of mice consuming fresh and cold-stored mare’s colostrum and milk are presented in (Fig 2). There were no significant differences in blood glucose levels between any of the groups at the start of the experiment (day0). The control group’s glucose levels remained relatively stable over the four days of experiment. All groups had similar starting glucose levels around 133-135 mg/dl (day 0). At day 1, the fresh mare’s colostrum group showed the lowest blood glucose value (P<0.0001) followed by mare’s milk and control groups, respectively. At day 2, day 3 and day 4, mare’s colostrum and milk cold-stored were given to mice. The blood glucose values were the highest (P<0.0001) in cold-stored mare’s milk group followed by cold-stored colostrum compared to control group at day 3 and day 4. These effects could be attributed to the ingredients in mare’s colostrum and milk (Table 1).
Both mare’s colostrum and milk contain various biological compounds, some of which can potentially affect on blood glucose levels and body functions
(Kazimierska et al., 2021; Musaev et al., 2021; Chen et al., 2024). Mare’s milk use in people with diabetes helps reduce the dose of insulin and improves the glycemic index (
Jastrzębska et al., 2017). Cold storage is a common method for preserving food and biological samples, which can have a significant effect on mare’s colostrum and milk
(Cuttance et al., 2024). Mare’s milk is sensitive to heat above 40
oC, so it requires quick cooling and should be used in liquid form within 6-9 hours of milking
(Dankow et al., 2006; Teichert et al., 2020; Hachana et al., 2022). In addition, short-term refrigeration (up to 48 hours) generally preserves the concentration of most immunological factors
(Vincent et al., 2018; Straat et al., 2022). However, some studies have shown a decrease in certain cytokines even after relatively short periods of refrigeration (
Pawłowska et al., 2022).