Określenie zależności między wymiarami ciała bydła rasy czerwono-białej w różnym wieku

112 heifers and 66 young bulls of Red-White breed were examined, grown in two herds in the Lower Silesia. They sprang from 11 bulls and 168 cows. The calves were measured and weighed two days after their births and at the age of one month, 3 and 6 months, as well as when they were 12 and 18 months old. Besides, the mothers of those calves were weighed and measured just after they calved. At the above mentioned periods, each calf and its mother's weight and ten measurement were determined. The data served to estimate the corelation between the same features found in mothers and their offspring on both esxes, as wall as the corelation between the values of those features in osssprin of various ages. It turned out that bulls up to 18 months old weighed more and were bigger than heifers of same age. All those differences were increasing with the calves' age. Both body weights and measurements of mothers were found as essentially related to the same features in their heifers and young bulls just after they were bom and a month later. At further stages of the calves' lives, no dependence of mothers' body sizes and those of their offspring has been found out. However, the sizes of heifers and bulls at their births had an influence upon their measurements at the age of one and 3 months. The results of the estimations prove that both weight and measurements of the calves under examination were closely related to the values of those features found in calves 12 months old.