Open AccessSynaptomenal Complex Analysis of Four Breeds of Bos Taurus Taurus x B. Taurus Indicus Hybrids
Author(s) -
Scavone Marcia D. P.,
Oliveira Claudio,
Trinca Luzia Aparecida,
Foresti Fausto
Publication year - 2000
Publication title -
hereditas
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.819
H-Index - 50
eISSN - 1601-5223
pISSN - 0018-0661
DOI - 10.1111/j.1601-5223.2000.00073.x
Subject(s) - biology , purebred , hybrid , bivalent (engine) , synaptonemal complex , zoology , crossbreed , veterinary medicine , genetics , meiosis , botany , gene , medicine , chemistry , organic chemistry , metal
The synaptonemal complex (SC) was analyzed in four F, hybrids of Bos taurus taurus and B. taurus indicus including Gyr‐Simmental (G‐S), Nelore Simmental (N‐S), Gyr‐Holstein‐Friesian (G‐H) and Nelore‐Piemontese (N‐P). We analysed the frequency of various types of SC abnormalities and the frequency of cells with SC abnormalities. The results were compared with similar observations made on purebred animals. All the animals studied possessed 29 autosomal and one sex bivalent. The frequency of cells with abnormalities in the hybrids were 28.0 % in the N‐P, 29.1 % in the G‐S, 33.3 % in the N‐S and 40.0 % in the G‐H. The frequency of cells with abnormalities in the four hybrids was 31.5 %; 57.9 % of these abnormalities occurred in zygotene and 42.0 % occurred in pachytene. The comparisons among the hybrids and among the hybrids and their parental breeds showed that the only significant difference was between Gyr and Gyr‐Holstein‐Friesian animals. Some aspects of the relationship between the frequency of cells with anomalies and the fertility of hybrids are discussed.