Year 2025, Volume 10, Issue 2
| Year : | 2025 |
| Volume : | 10 |
| Issue : | 2 |
| Authors : | Nassima BOUHROUM, Halima OUADEH, Leyla SLATNA, EL Hassan LANKRI |
| Title : | THE EFFECTS OF HEAT STRESS ON THE EXISTENCE OF STAPHYLOCOCCI IN MILK PRODUCED BY DAIRY COWS |
| Abstract : | Mastitis is an inflammation of the mammary gland affecting the dairy cattle. This disease is prevalent in our farms at a frequency estimated at 20% of the clinical pathology in dairy cows. Mastitis causes considerable economic losses due to the decrease in quantity and the quality of milk produced. This must include the cost of therapies and reforms. The germs responsible for mastitis are very numerous; Staphylococci are the most important pathogens causing subclinical mastitis. This study tends to assess the heat stress experienced by lactating cows and its effect on Staphylococcal mastitis. Therefore, we observed 15 milking dairy cows with an average age of 3.5 years after calving. Temperature-humidity index (THI) was calculated after recording temperatures and humidity, to test the effects of three levels of THI (<68; (72- 79); >80) on Staphylococcal mastitis. The results indicated that the number of coagulase-positive Staphylococcus aureus was higher during the winter and spring seasons at values of 1.03 x 102 and 1.19 x 102, respectively, compared to the summer season at value of 0.75 x 102. The result of the antibiogram showed that Staphylococcus aureus was resistant to Lyncomicin and oxacilin. In conclusion, heat stress causes respiratory alkalosis that has a bacteriostatic effect on Staphylococcus aureus growth, and the best timing for the treaty is the summer season using one of the following antibiotics (Amoxicilin, Rifampicin, Levofloxacin, Erythromicin, Chloronphennicol). |
| For citation : | Bouhroum, N., Ouadeh, H., Slatna, L., Lankri, E. H. (2025). The effects of heat stress on the existence of staphylococci in milk produced by dairy cows. AGROFOR International Journal, Volume 10. Issue No. 2. pp. 114-120. DOI: 10.7251/AGREN2502114B |
| Keywords : | Antimicrobial use, Heat stress, Lactation cow, Mastitis, Staphylococcus aureus. |
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ISSN 2490-3434 (Printed)
ISSN 2490-3442 (Online)
ISSN 2490-3442 (Online)
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