SOLIDS-NOT-FAT (SNF) PROFILE OF CROSSBRED COW MILK
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Date
2018
Authors
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Journal ISSN
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Publisher
COLLEGE OF VETERINARY AND ANIMAL SCIENCES-MANNUTHY,THRISSUR
Abstract
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.