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Subject: Dairy Science × Author: ANJALI. C. B × End date: 2018 × Start date: 2018 × Type: Thesis ×
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    ThesisItemOpen Access
    SOLIDS-NOT-FAT (SNF) PROFILE OF CROSSBRED COW MILK
    (COLLEGE OF VETERINARY AND ANIMAL SCIENCES-MANNUTHY,THRISSUR, 2018) ANJALI. C. B; C. T.SATHIAN
    A study was conducted for screening of milk samples from crossbred cows for the incidence of low SNF and analyse the milk composition to find out milk constituents leading to low SNF. A total of 274 morning milk samples were collected from organized farms and individual households in Thrissur district. The samples were categorized into different groups based on their SNF content, fat per cent, stage of lactation of the cow, CMT score of the milk samples, milk yield of the cow, parity of the cow, season of sample collection, and type of milking. There were 121 milk samples with low SNF (<8.3 per cent). It was noticed that Incidence of low SNF cases (44 per cent) were more prevalent than low fat cases (19 per cent). Milk samples with low lactose (42), low protein (10) and Low lactose + low protein (69) resulted in drop in SNF. Statistical analysis of the data revealed that CMT score of the milk samples had significant (P<0.05) positive influence on protein content, lactose content and SNF content. Lactose content had significant (P<0.01) positive correlation with protein and SNF contents of milk. Low lactose (below 4.5 percent) samples were further analysed for total viable count, somatic cell count and subjected to antibiotic sensitivity test. Low milk protein (below 3 per cent) samples were subjected to estimation of casein, whey protein, total nitrogen and milk urea nitrogen. Low casein (below 2.6 per cent) samples were subjected to gel electrophoresis. All bands of casein (α, β and Κ) were present in all the samples. Stage of lactation had a significant (P<0.05) positive influence on fat and total solids percentage. Farm trials were conducted in cows with low SNF depending on the constituent affected. Cows with low lactose were treated with antibiotics. A significant (P<0.01) positive improvement in the lactose percentage and SNF percentage of the milk could be obtained by therapy and Gentamicin was most effective antibiotic. Feeding of bypass protein rich diet to cows in high plane of nutrition with low protein in milk did not bring about any improvement in SNF.