Dependence of the production process of rennet semi-solid cheeses on quality indicators of raw milk
The analysis of literature sources on the question of the relevance of the influence of raw milk and its casein fraction on the production of rennet cheeses is presented in the paper. The studies were conducted to determine the suitability of using milk for the production of rennet milk from raw materials of cows of Ukrainian brown dairy and Ukrainian black-rumped dairy breeds of the state enterprise “Research Institute of Agriculture of the North East of NAAS”. As a result of the studies on the cheesiness of milk samples from the two study groups, we can conclude that, compared to the literature data, the average milk values obtained from cows of Ukrainian brown dairy and Ukrainian black-and-white breeds are confirmed. While analyzing the technological parameters of milk, it should be noted that there is no significant difference between the samples. We should note only that the first sample is inferior to fat by 0.41. This ratio of fat to protein, in turn, affects the yield of the product and its consumption characteristics. The first sample the creation of casein was in 3.2 min. faster , phase of gelforming – for 0.3 min. faster and the clot processing was done requiring 3 min less time. The consumption of milk per 1 kg of cheese in the first sample was lower than 0.4 in the second. It should be noted that the curd grain obtained from the milk of cows of the Ukrainian black-ruby dairy breed had a softer structure, ie it contained more moisture than the grain from the milk of cows of the Ukrainian brown dairy breed. This subsequently affected the mass fraction of moisture in the finished product in the direction of increase and was reflected in the organoleptic evaluation. As a result of the evaluation, members of the tasting committee noted that the consistency, taste and smell of cheese made from milk of Ukrainian brown dairy breed were slightly better. The difference was not significant and was respectively 1 point. It should be noted that the mass fraction of fat in the first sample was 1.3% higher than in the second sample. In this case, we observe a decrease in the mass fraction of moisture in the first sample compared to the second by 1.8%. The difference in terms of mass fraction of salt was not significant and is 0.1%. Considering the results of the presented studies, it should be noted that both samples of cheese of semi-solid cows made of milk of Ukrainian brown dairy and Ukrainian black-and-white breeds meet the requirements of state standart 4669:2006 in terms of organoleptic, physicochemical and microbiological parameters. However, the production of cheese from the milk of cows of Ukrainian brown dairy breed will reduce the loss of raw materials and produce cheese with better organoleptic characteristics.
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