Abstract— The objective of this study was to evaluate relationship between California Mastitis Test scores (CMT) and Somatic Cell Counts in different crossbred dairy cattle genotypes. A total of 152 milk samples were screened for mastitis using the California Mastitis Test (CMT) kit. Somatic Cell Count (SCC) in milk samples were analysed directly using microscopic method. Based on the analysis of CMT score, the study found out that 55.92 % of udder quarters were negative while 43.99 % were positive for subclinical mastitis. The Least Square Difference (LSD) for pairwise comparison between CMT scores and lactation stage were significantly different between First and second lactation at 0.25±0.11; second and third at 0.27±0.0118 at P≤ 0.05. The means of SCC among the breeds were significantly different at P≤0.05; Ayshires and Friesians (68,055±18.82 cells/ml); Ayshire and Guernsey (71,976±23.844 cells/ml); Friesians and Jerseys (64.863±21.429 cells/ml); and Guernsey and Jersey (68.78±25.952 cells/ml). In conclusion, this study provides baseline information in the area of selection for mastitis resistant breeds of dairy cattle. This study also strongly recommends the use of this technique in screening for somatic cell counts in udder quarters of crossbred dairy cattle.
Keywords; Crossbred, Mastitis resistant, Somatic Cell Count, Somatic Cell Score.
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