HISTOLOGICAL CHANGES IN THE MAMMARY GLAND OF EWE IN RELATION TO ESTROGEN AND PROGESTERONE LEVELS DURING PREGNANCY HISTOLOGICAL CHANGES IN THE MAMMARY GLAND OF EWE IN RELATION TO ESTROGEN AND PROGESTERONE LEVELS DURING PREGNANCY

Document Type : Research article

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Abstract

The changes in the prop < /strong>ortion of glandular tissue, alveolar diameter, number of alveoll p < /strong>er unite area, number of nucleip < /strong>er alveolar cross section and the stromal area were estimated quantitatively in the mammary gland in relation to oestrogen and progesterone levels in ewe slaughtered at frequent intervals of pregnancy (30, 60, 90, 120 and 140 days) as well as immediatley before p < /strong>arturation. The prop < /strong>ortion of the glandular tissue increased gradually from 9% at day 30 and reached 84% at day 150 of pregnancy. There was a stricking fall in the number of alveoli per unite area and a corresponding rise in the alveolar diameter from day 120 of pregnancy till before lambing. The number of nuclei in the average alveolar cross section was relatively constant until day 90 then gradually increased and reached. Its maximal value on day 150.

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