Studies on the Heifer Mastitis (14) : Postnatal development of the udder

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Other Title
  • 未経産牛乳房炎に関する研究 (第14報) : 乳房の生後発育
  • 未経産牛乳房炎に関する研究-14-乳房の生後発育
  • ミ ケイサン ウシ ニュウボウエン ニカンスルケンキュウ 14 ニュウボウ ノ

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Abstract

Gross and microscopic observations on the postnatal developmont of udders were made in 2-day to 25-month-old heifers and bulls. In udders from heifers younger than 62 days of age, the lactiferous sinuses and mammary ducts were limited within narrow extent of dorsoposterior parts from each teat, and the bulk of udder consisted of adipose tissue. In udders from heifers older than 6 months, the lactiferous sinuses and mammary ducts istributed all over the udder. The alveoli appeared in udders of heifers at their 9 months and showed secretion in udders of those aged 10 months. The udders of a 25-month-old heifer was made up of lobules of closely packed alveoli. The structure of udders of bull younger than 25 days of age were identical to that of 4-day-old heifer. In udders from a bull older than 61 days of age, the teats and lactiferous sinuses devloped slightly, but the mammary ducts and adipose tissue degenerated.

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