P119 CEEFAX 119 Sat 16 Apr 17:26/44          Soviet scientists are optimistic that test-tube breeding experiments will lead to a race of pedigree "supjrcows". The embryo of a bull calf from pedigree parents was implanted into an ordinary cow in a Leningard research institute. The offspring resulting from the experiment was developing healthily, said the Soviet news agency, TASS. The leader of the research team said the experiment showed a pedigree cow could have scores of offspring through foster mothers instead of only five or six. People 118 - Films 175 - Top 4O 176