[Duration of the period of use of breeding cows].
D000367:Age Factors; D000818:Animals; D002417:Cattle; D003612:Dairying; D005260:Female; D008892:Milk; D011247:Pregnancy; D011270:Pregnancy, Animal; D014586:USSR
O prodolzhitel'nosti srokov ispol'zovaniia plemennykh korov.