Gametic products transmitted by rcp(13q--;14q+) translocation heterozygous pigs, and resulting embryonic loss.

Abstract

Among embryos and neonates produced by pigs heterozygous for the reciprocal translocation rcp(13q-;14q+) were recovered: Preimplantation embryos: (1) From a heterozygous boar mated to 10 normal gilts, 109 embryos, 36 karyotyped (14 balanced normal, 11 balanced heterozygous, 11 unbalanced). (2) From a normal boar mated to 10 heterozygous gilts, 81 embryos, 33 karyotyped (10 balanced normal, 14 balanced heterozygous, 9 unbalanced). (3) From a heterozygous boar mated to 2 heterozygous gilts, 24 embryos, 11 karyotyped (2 balanced normal, 4 balanced heterozygous, 5 unbalanced). Postimplantation embryos: (1) From a heterozygous boar mated to 3 normal gilts, 19 embryos (7 balanced normal, 12 balanced heterozygous). (2) From a normal boar mated to 4 heterozygous gilts, 17 embryos (5 balanced normal, 10 balanced heterozygous, 2 degenerated). (3) From a heterozygous boar mated to a heterozygous gilt, 4 embryos (2 balanced heterozygous, 2 degenerated). Embryonic mortality estimated from numbers of corpora lutea and of living implanted embryos in heterozygous gilts mated with a normal boar, and in normal and heterozygous gilts mated with a heterozygous boar was 72.3 %, 68 %, and 85.5 %, respectively. The average litter size in the latter two types of matings was 7 and 5.1. The results are discussed in relation to meiotic behaviour, gametic products and embryonic mortality.