DAIRY INDUSTRY

Manawatu Standard, Volume LX, Issue 137, 10 May 1940, Page 8

DAIRY INDUSTRY

FACTORY MANAGERS’ WEEK. ADDRESSES AT MASSEY COLLEGE The factory managers’ week, conducted by the New Zealand Dairy Research Institute, was continued yesterday at Massey Agricultural College, when several addresses were given. \ Experiments, on cheese manufacture were dealt with by Professor AV. Riddet and Dr 1. It. Sherwood -in the morning. Professor Riddet spoke of the effect on . cheese of various factors, in the manufacturing process, including acidities, the effects of dry storing and salting, and the influence of mastitis on milk and cheese manufacture and quality. The conclusion was that large variations in manufacture did not have a great influence on the quality of the filial cheese, as might have been expected. Mastitis milk, when pasteurised, gave quite a good quality of cheese, but the raw mastitis milk did not give such good results.. However, the. effect of mastitis on cheese quality was also not as great as might be generally considered. Dr Sherwood spoke of the influence of bacteria on cheese ripening, making particular reference to . the openness of cheese. He indicated how .the sources of various bacterial organisms had been traced back to the milking machines, particularly to old worn rubber parts of them. These organisms, he said, were also found in the cow yards, and came to some extent from pasture species. Fermenting vegetable matter was also' a source of bacteria. Considerable interest was taken in the addresses. TAINTS IN FEED. The elimination of land cress and other feed taints by vacreation was the subject of an address to buttermakers, given by Dr F. H. McDowall. Dr McDowall detailed the history of the work in the last few years on the incidence of feed taints hi cream, the causes and the means of elimination by tho methods available. He said that it had been shown that clovei's, especially in the spring, if fed in large proportions had the effect of causing a feedy taint in cream. This could be avoided if the cows were removed from the clover pasture several hours before milking. The vacreator was able to remove a considerable proportion of the taint, but did not completely eliminate it from heavily tainted cream. The land cress taint was due to the consumption by the animals of an open weed which flowered particularly in open pastures. It had been shown that steam distillation could remove the land cress taint, and experiments had been carried out to find out practical means of its elimination in factories. Some modification of the vacreator had been introduced by makers, and gave promising results hut conclusions had not been completed. It had been shown at, Massey College on a small scale and by the Department of Agriculture at Tauranga on a largo scale that the removal of cows from the tainted pastures several-hours before milking had tile same, effect as with clover in permitting the elimination of the flavour by the animal 'itself.