Secondary sexual traits and semen characteristic of chicken germline chimeras

Abstract

Birds obtained by embryo engineering are used to study embryo development and to produce transgenic birds. As this method of producing birds still generate strong emotions of the public opinion head ornaments, testes and semen characteristics of sex chimera roosters were examined to check whether they differ from chickens obtained by non-manipulated methods. Measurements of head ornaments, testes and semen were correlated with each other. Semen quality factor (SQF) was calculated, as well as the level of fluctuating asymmetry (FA) of bilateral traits (wattles and testes). Positive correlation was found for comb width and wattle length and comb thickness and sperm concentration. Semen characteristics and FA did not exceed the level encounter in other chicken lines. Results obtained indicate that germline chimeras are similar in appearance of secondary sexual traits, and semen and testes characteristics to chickens produced in non-manipulated way.

HOXB8 overexpression induces morphological changes in chicken mandibular skin: an RNA-seq analysis

“…As the most easily observed secondary sexual characteristic, combs have been studied more than wattles ( Johnsson et al, 2012 ; Al-Ramamneh et al, 2016 ; Shen et al, 2016 ; Lukaszewicz et al, 2018 ). For example, the comb phenotype variants Pea-comb, Rose-comb , and Duplex-comb are the result of genomic structural variation that leads to the aberrant expression of transcription factors and abnormal comb development ( Wright et al, 2009 ; Boije et al, 2012 ; Imsland et al, 2012 ; Dorshorst et al, 2015 ).…”