|
|
Incidence of subclinical mastitis in, buffalo farms in relation to microbial and chemical content of milk
|
|
Abstract: The test day technique was adopted during April for detection of subclinical mastitis in hand milking buffaloes using California Mastitis Test (CMT). A total number of 792 quarter milk samples were collected from 198 buffaloes raised in four farms (FI, F3, F4 governmental and F2 private farm) located in different parts of the Nile delta. Individual quarter milk samples were collected for bacteriological examination and determination of milk pH, electrical conductivity (EC), somatic cell count (SCC) and chemical composition. Bucket milk samples were taken only from animals exhibited negative CMT scores. Positive scores of CMT were detected in 207 quarters (22.5%) out of 792 tested quarter samples.
The prevalence of subclinical mastitis in buffaloes based on CMT in farms FI, F2, F3 and F4 were 15.2%,31.6%,34.9% and 37.5%, respectively.
Differences in daily milk yield (DMY) between non infected (NI) and subclinically infected (SI) buffaloes in each farm were not significant. Also, differences in log SCC of NI animals between the different farms were not significant while, log SCC in milk of SI quarters was greater by 16.22% than that in NI quarters.
Milk of SI quarters had significantly (P<0.05) less EC and higher pH value. Percentages of fat, lactose, total solid and solid not fat were relatively less in milk samples of SI quarters in farms F3, F4 when compared with NI quarters. Milk samples of NI quarters in farm FI had the least SCC among tested farms accompanied with greater percentages of TS%, SNF%, and protein% when compared with corresponding values of other farms.
Contagious bacteria was relatively greater than environmental bacteria in quarter milk samples of buffaloes. Corynbacteria spp., Str. dysgalactiae and Staph. aureus were the predominant contagious pathogens causing mastitis in buffaloes while, B. cereus and Coliform spp. represented the predominant environmental bacteria. The highest percent of Corynbacteria spp. (>I00cfu/ml) was found in farm F4. The highest percentages of infected quarters with Str. dysgalactiae (74.1%) and Staph. aureus (77.8%) were found in farm F2. Meanwhile, Farm F2 exhibited great percent of SI cases, the highest DMY and the highest log SCC in NI quarters. Milk samples obtained from most of the studied farms had no count for Str. uberis except farm F2 denoting impairment of mastitis control in the private farm.
Log counts of both contagious and environmental bacteria were significantly (P<0.05) higher in SI cases than in NI animals. Corynbacteria spp and Staph. aureus were significantly manifested in SI animals of all farms. B. cerues was characteristic in farms F1 and F4 while, Coliform spp enhanced in quarters of farm F1 and F3. It was observed that, SCC tended to increase with the increased count of bacteria beyond 100cfuJml while, a reverse trend was noticed for bacterial counts less than 100cfu/ml.
It can be concluded that, in buffalo farms SCC in bucket milk samples is not a reliable measure representative for quarter subclinical infection, and identification of mastitis causing pathogens is essential to setup a suitable program to control farm management and eradicate spread of infection.
Keywords: Buffalo farms, subclinical mastitis, milk composition, microbial content.
|
| Publication year |
2008
|
| Pages |
252-268
|
| Availability location |
معهد بحوث الانتاج الحيوانى- شارع نادى الصيد- الدقى - الجيزة
|
| Availability number |
|
| Organization Name |
|
| City |
القاهرة
|
| serial title |
Proceeding Of Middle East & North Africa Conference For Future of Animal Wealth Cairo International Convention Center, Egypt, 16-18-0ctober
|
| Author(s) from ARC |
|
| External authors (outside ARC) |
محسن عبد العزيز زمارة
جامعة كفر الشيخ
|
| Agris Categories |
Animal physiology - Reproduction
|
AGROVOC
TERMS |
Chemical composition.
Farms.
Mastitis.
Milk.
Water buffaloes.
|
| Proposed Agrovoc |
microbial content;
|
| Publication Type |
Conference/Workshop
|