Abstract
The aim of the study was to establish how the addition of rapeseed oil to a processed feed mixture affects the milk produced on commercial dairy farms as well as the composition and quality of the products made from that milk. In this study, replacing grain with processed feed mixture to which 2 or 4 % rapeseed oil had been added was not found to affect milk yield or composition to any considerable extent. As a result of the test feedings, the amounts of myristic and palmitic acid in the milk fat decreased and those of stearic and unsaturated fatty acids increased. This change in fatty acid composition can be viewed as nutritionally desirable, and it also had a good effect on the consistency of butter. During the second test period (4 % rapeseed oil) the cutting firmness figures of the butter were lowest, and in sensory evaluations the butter was also found to have the best consistency. The test feeding had a slight beneficial effect on the composition of milk protein. The amount of casein nitrogen grew and that of NPN fell. However, the test feeding was not found to affect the quality of the market milk, cream, cheese or milk powder.
Highlights
Observations about the effects of feed fat Especially during the winter, milk fat produced in Finland is extremely saturated and hard
The entire herd of 90-110 dairy cows was involved in the test in which the fat content of processed feed mixture was raised, mainly by adding rapeseed oil
The aim of the research was to establish how the addition ofrapeseed oil to a processed feed mixture affects the milk produced on commercial farms, and the composition and quality of products made from that milk
Summary
Observations about the effects of feed fat Especially during the winter, milk fat produced in Finland is extremely saturated and hard. Earlier experience has shown that this can best be achieved through feeding It has been known for a long time that the composition of milk fat can be radically altered using fat additives (Orth et al 1956). Research on such procedures, e.g. the addition of tall oil or its ethyl esters to the feed, was started in Finland already in the early 1960's (Antila, V. et al 1963 and 1965). The entire herd of 90-110 dairy cows was involved in the test in which the fat content of processed feed mixture was raised, mainly by adding rapeseed oil. When the fat content of the processed feed mixture was increased from 3.0 to 7.6 %, the total amount of unsaturated fatty acids rose from 25.7 to 41.8 % and the iodine number from 29.2 to 41.4. Practical feeding tests on commercial farms were considered necessary to obtain further data
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