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[The effect of granulosa cells on maturation, fertilization and cleavage in vitro].

Addition of granulosa cells (GC) (1.10(6)/ml) affected maturation of non-ovulatory oocytes of cattle and caused delay in nuclear maturation (60.8 versus 35.3 or 37.1 percent). In vitro use of pre-incubated GC in the process of maturation led to higher rates of fertilisation (49.4 versus 25.2 or 21.0 percent) and of cleavage (29.6 versus 13.3 or 9.1 percent). No explanation has yet been found for different oocyte behaviours in response to use of fresh or pre-incubated GC. Transfer of seven embryos from maturation with GC as well as in vitro fertilisation and development to four recipients resulted in the birth of one female calf.