Author/Authors :
Hamid، I.M.B. نويسنده 1Department of Dairy Production, Faculty of Animal Production, University of Khartoum, Khartoum North Postal code 13314 Sudan , , Shuiep، E.S. نويسنده 1Department of Dairy Production, Faculty of Animal Production, University of Khartoum, Khartoum North Postal code 13314 Sudan , , El Zubeir، I.E.M. نويسنده Department of Dairy Production, University of Khartoum, Postal code 13314, Khartoum North, Sudan , , Saad، A.Z. نويسنده 3Department of Microbiology, Faculty of Veterinary Medicine, University of Khartoum, Khartoum North, Sudan , , El Owni، O.A.O. نويسنده 1Department of Dairy Production, Faculty of Animal Production, University of Khartoum, Khartoum North Postal code 13314 Sudan ,
Abstract :
The purpose of the present study was to investigate the effect of S. aureus mastitis on the compositional quality of milk. Sixty milk samples were collected from 19 Frisian, 16 cross and 25 local cows suffering from subclinical (14) or clinical (46) mastitis from different farms in Khartoum State, Sudan. Total bacterial count, S. aureus count and some compositional quality were estimated. Non-significant (P?0.05) differences were recorded between the milk obtained from the three groups of dairy cattle for total bacterial count. However, significantly (P?0.05) higher S. aureus count was obtained (2.7× 103± 0.7 cfu/ ml) for milk samples from cross- bred cows. Chemical analysis revealed no significant (P?0.05) differences in total solids (11.87? 1.7 and 11.1± 1.6%), protein (4.3± 2.8 and 3.6± 0.5%), fat (3.1± 0.7% and 3.10± 0.5), lactose (2.3? 0.5 and 2.1± 0.7%) and acidity (0.211± 0.14 and 0.44± 0.36 %) for milk obtained from cows with subclinical and clinical mastitis, respectively. However, significantly higher ash content was found in milk samples collected from clinical mastitis (0.68± 0.12%) compared to subclinical ones (0.6 ? 0.15%). Milk constituents of infected milk by S. aureus revealed non-significant (P?0.05) differences expect for lactose (P < 0.01), which showed variations between breeds. Total bacterial count showed significantly (P?0.05) negative correlation (r= -0.037) when compared with lactose content of mastitic milk. It could be concluded that mastitis caused by S. aureus would resulted in the decrease the nutritive content of milk.
