昼間の搾乳間隔を6時間半とした不等間隔搾乳の生産ならびに乳房炎発生におよぼす影響

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概要

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• It has been conventional for a long time that milking at 12-hour intervals be car-ried out for highest production from dairy cows, when a twice daily milking schedule is employed. Recent increases in wages, however, have required milking to be done within the eight hours of working day without premium payment for overtime work: this has led to unequal intervals between milkings.Many researchers have found that cows milked at unequal intervals yield less milk than those milked at equal intervals, though only a few1-4) of them have confirmed the significant difference in milk production between those two milking routines. Milk-ing intervals during the daytime employed in previous experiments were more than 8 hours, most of them being between 8.5-9.0 hours. Our previous experiments4), in which milking intervals were 7.5 and 16.5 hours, revealed a significant decrease of 2.4% in milk production and in milk composition, except for fat production due to unequal interval milkings, although no adverse effect was detected in udder health.With increasing herd sizes, however, it has become difficult to complete a twice daily milking routine within 8 or 9 hours during the daytime even if such unequal intervals as in our experiment were practised. In the present study, therefore, further nvestigation of a more severe difference between milking intervals, 6.5-17.5 hrs, was conducted to confirm the effects of unequal interval milking upon the production and udder health of dairy cows. An economic evaluation of unequal interval milking was also discussed.

• 社団法人 日本畜産学会の論文

著者

• 市川 忠雄

  筑波大学農林技術センター

• 藤島 通

  National Institute of Genetics

• 市川 忠雄

  筑波大学農林学系

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