Mena Saad - Academia.edu (original) (raw)
Papers by Mena Saad
Acta Veterinaria Brasilica, 2021
A total of 695 Holstein Friesian lactating dairy cows were examined for the prevalence of subclin... more A total of 695 Holstein Friesian lactating dairy cows were examined for the prevalence of subclinical mastitis (SCM) and its association with selected risk factors in a private dairy farm at Fayoum district, Egypt. 444 lactating cows with 1145 quarters were found positive for SCM with prevalence of 63.88% and 41.18% at cow and quarter level respectively based on California Mastitis Test (CMT), Electrical Conductivity (EC) that had a mean value of 6.27 ± 0.066 mS/cm and Somatic Cell Count (SCC) with a mean value of 8.8×105± 9.2×103 cells/ml. The risk factors investigated in this study revealed that the highest percentage of SCM was observed in winter, in cows at the late lactation stage with a percentage of 32.21 and 59.91 respectively. The results concluded that the young age cows were exposed to SCM more than old ones. While the occurrence of SCM was higher in cows with 2nd, 3rd and 1st than those with 4, 5, 6th parity number. The analytical results also revealed that there is a hi...
Egyptian Journal of Chemistry, 2021
International Journal of Dairy Science, 2020
![Research paper thumbnail of Safety and quality aspects of whole and skimmed milk powders [pdf]](https://attachments.academia-assets.com/95551304/thumbnails/1.jpg)
](Acta Scientiarum Polonorum Technologia Alimentaria, 2021
Background. Nowadays, dried milk products are highly traded and consumed all over the world, so w... more Background. Nowadays, dried milk products are highly traded and consumed all over the world, so we aimed in this study to evaluate to what extent whole and skim milk powders are safe and comply with Egyptian standards. Materials and methods. Eighty samples of dried milk (50 whole milk powder and 30 skim milk powder) were gathered from several retailers and supermarkets for evaluation of their differing quality and safety parameters. Results. The most frequent off-flavors recovered from whole milk powder samples were cooked ones and, in the case of skim milk powder samples, flat ones. Five samples of whole milk powder were of fair quality and three samples of poor quality, according to the sensory evaluation. The compositional parameters, moisture, %, fat, %, protein, %, and acidity, %, were measured as mean values of 3.90 ±0.15, 26.90 ±0.19, 25.53 ±0.27, and 0.99 ±0.03% in the examined whole milk powder samples and 3.77 ±0.08, 1.11 ±0.05, 34.62 ±0.29, and 1.22 ±0.03% in the examined skimmed milk powder samples, respectively. These results were within the range of component requirements set by the Egyptian Standard (2014; ES: 1780/2014) for dried milk products. Also, the microbiological safety of the milk powder samples was analyzed by assessment of the total viable count, total yeast and mold count, Coliforms count, Enterobacteriaceae, E. coli, C. sakazakii, Staphylococcus aureus, Salmonella, and Listeria monocytogenes. Staphylococcus aureus was the most prevalent isolate (36.00% and 6.67%) followed by Enterobacteriaceae (20.00% and 3.33%), of whole and skim milk powder, respectively. Enterobacteriaceae isolates included Enterobacter cloacae ssp. Cloacae, and Pantoea spp., which were specified by traditional biochemical tests and Vitek2 system. All Enterobacteriaceae isolated spp. were resistant to cephalothin, neomycin, tobramycin and colistin sulphate, and sensitive to chloramphenicol, gentamycin and nalidixic acid. E. coli, C. sakazakii, Salmonella, and Listeria monocytogenes couldn't be isolated from all the tested samples. By using Inductive Coupled Plasma-Mass Spectrometer (ICP-MS), we could measure lead and mercury as mean values of 0.243 ±0.069 and 0.261 ±0.052 mg/kg for whole milk powder samples at a percentage of 68.00 and 34.00%, while for the skim milk powder samples they were 0.150 ±0.037, and 0.347 ±0.110 mg/kg at a percentage of 66.67 and 40.00%, respectively. Conclusion. Finally, thirty-four whole milk powder and twelve skimmed milk powder samples didn't comply with Egyptian standards, so it is necessary for authorities to put more attention on this and regular monitor it.
Acta Veterinaria Brasilica, 2021
A total of 695 Holstein Friesian lactating dairy cows were examined for the prevalence of subclin... more A total of 695 Holstein Friesian lactating dairy cows were examined for the prevalence of subclinical mastitis (SCM) and its association with selected risk factors in a private dairy farm at Fayoum district, Egypt. 444 lactating cows with 1145 quarters were found positive for SCM with prevalence of 63.88% and 41.18% at cow and quarter level respectively based on California Mastitis Test (CMT), Electrical Conductivity (EC) that had a mean value of 6.27 ± 0.066 mS/cm and Somatic Cell Count (SCC) with a mean value of 8.8×105± 9.2×103 cells/ml. The risk factors investigated in this study revealed that the highest percentage of SCM was observed in winter, in cows at the late lactation stage with a percentage of 32.21 and 59.91 respectively. The results concluded that the young age cows were exposed to SCM more than old ones. While the occurrence of SCM was higher in cows with 2nd, 3rd and 1st than those with 4, 5, 6th parity number. The analytical results also revealed that there is a hi...
Egyptian Journal of Chemistry, 2021
International Journal of Dairy Science, 2020
Acta Scientiarum Polonorum Technologia Alimentaria, 2021
Background. Nowadays, dried milk products are highly traded and consumed all over the world, so w... more Background. Nowadays, dried milk products are highly traded and consumed all over the world, so we aimed in this study to evaluate to what extent whole and skim milk powders are safe and comply with Egyptian standards. Materials and methods. Eighty samples of dried milk (50 whole milk powder and 30 skim milk powder) were gathered from several retailers and supermarkets for evaluation of their differing quality and safety parameters. Results. The most frequent off-flavors recovered from whole milk powder samples were cooked ones and, in the case of skim milk powder samples, flat ones. Five samples of whole milk powder were of fair quality and three samples of poor quality, according to the sensory evaluation. The compositional parameters, moisture, %, fat, %, protein, %, and acidity, %, were measured as mean values of 3.90 ±0.15, 26.90 ±0.19, 25.53 ±0.27, and 0.99 ±0.03% in the examined whole milk powder samples and 3.77 ±0.08, 1.11 ±0.05, 34.62 ±0.29, and 1.22 ±0.03% in the examined skimmed milk powder samples, respectively. These results were within the range of component requirements set by the Egyptian Standard (2014; ES: 1780/2014) for dried milk products. Also, the microbiological safety of the milk powder samples was analyzed by assessment of the total viable count, total yeast and mold count, Coliforms count, Enterobacteriaceae, E. coli, C. sakazakii, Staphylococcus aureus, Salmonella, and Listeria monocytogenes. Staphylococcus aureus was the most prevalent isolate (36.00% and 6.67%) followed by Enterobacteriaceae (20.00% and 3.33%), of whole and skim milk powder, respectively. Enterobacteriaceae isolates included Enterobacter cloacae ssp. Cloacae, and Pantoea spp., which were specified by traditional biochemical tests and Vitek2 system. All Enterobacteriaceae isolated spp. were resistant to cephalothin, neomycin, tobramycin and colistin sulphate, and sensitive to chloramphenicol, gentamycin and nalidixic acid. E. coli, C. sakazakii, Salmonella, and Listeria monocytogenes couldn't be isolated from all the tested samples. By using Inductive Coupled Plasma-Mass Spectrometer (ICP-MS), we could measure lead and mercury as mean values of 0.243 ±0.069 and 0.261 ±0.052 mg/kg for whole milk powder samples at a percentage of 68.00 and 34.00%, while for the skim milk powder samples they were 0.150 ±0.037, and 0.347 ±0.110 mg/kg at a percentage of 66.67 and 40.00%, respectively. Conclusion. Finally, thirty-four whole milk powder and twelve skimmed milk powder samples didn't comply with Egyptian standards, so it is necessary for authorities to put more attention on this and regular monitor it.