搾乳法の改善が山羊乳中の細胞数および泌乳量におよぼす影響
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概要
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A comparative atudy was carried out on 25 milk goats for one lactation period. The animals were bivided into two groups, to which two sorts of milking procedure were applied as previously reported3). In the first group milking was done by a violent method (method A) which included intense massage of udders and strong pulling of teats. In the second group milking was done by an improved method (method B) which was mild and hygienic.Experimental results are as follows: (1) The milk obtained by method A contained many leukocytes and glandular epithelial cells which are usually found in the case of mastitis. On the other hand, the milk obtained by method B contained only a small number of these cells. The numbers of leukocytes and glandular epithelial cells in the milk obtained by method B were 1/3 to 1/10 and 1/5 to 1/15, respectively, of those in the milk obtained by method A. (2) The milk obtained by method A contained many degeneratod granules (anuclear protein granules) of uuknown origin, while the milk obtained by method B contained granules which were 1/5 to 1/9 of those found in the milk obtained by method A. (3) There was little difference between methods A and B in milk yield and fat content, although a slight increase of milk yield was noticed in the latter method. (4) The pH of milk was in a range of 6.4 to 6.6, which was thought to be normal, regardless of the milking method used. (5) The experimental results mentioned above lead to the conclusion that method B is superor to method A in the effect of improving the puality of milk, protection of the udder and teat, and prevention of mastitis.
- 社団法人 日本畜産学会の論文