Abstract
Six Yorkshire×Hampshire crossbred gilts were slaughtered at second estrus, 25, 50, or 100 days of gestation. Mammary systems were removed immediately and dissected into glands free of skin, muscle, and fat. Growth of the mammary gland was assessed by measuring the weight of the lyophilized fat free tissue, deoxyribonucleic acid (DNA) and ribonucleic acid (RNA) contents. The data were analyzed as DNA or RNA concentration per mg of tissue and content per gland.Lyophilized fat free tissue in the mammary system increased 6.5 times during the first 100 days of pregnancy. Average DNA per gland increased 4.9 times during this same period, from 121 mg/gland to 580 mg/gland and RNA increased from 199mg to 1,178mg. Ribonucleic acid and DNA ratio also increased from 1.6 to 2.0 as gestation advanced to 100 days. The increases in lyophilized fat free tissue, DNA and RNA came in the last half of pregnancy and accounted for approximately 100% of the growth.
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