A Comparative Study on the Casein Content of Cross Breed Cows

The amount of casein in milk is the most important fact in food nutrition. This research work was conducted to determine the level of casein content in different cross breed cows and to estimate a comparison among breed in terms of casein content. A total number of 100 milk samples from five different cross breed cows were collected from different dairy farms in Sylhet region of Bangladesh. Variance components for casein and genetic correlations of casein with milk production and lactation number considered from a samples of 25 Jersey cross breed, 25 Holstein cross breed, 25 Frisian cross breed, 15 Sahiwal cross breed, 10 Jersey breed × Frisian breed. In each samples 100ml milk was subjected to isolate the casein. The casein content was estimated 1.554g, 1.434g, 1.478g, 1.440g and 1.722g from Frisian cross breed, Jersey cross breed, Holstein cross breed, Sahiwal cross breed and Jersey × Frisian breed respectively. Each cross breed yielded clearly distinguishable patterns from the others. The statistical analysis of the data shows that there is no significant difference in casein content between Frisian, Jersey and Sahiwal cross breed cows at both 5% and 1% level of significance t-value. But the casein content of Frisian and Jersey × Frisian breed shows significant difference. These differences, suggested that a direct selection for casein could be more advantageous in Jersey × Frisian breed cows. In the light of this research, it seems that a new understanding and effective implementation of casein content in different cross breed cows should be enforced in the breed selection for breed development to fulfill the nutritional demand of the Bangladesh.