Prenatal growth and asymmetry of thyroid gland in the cattle (Bos primigenius f. taurus).
Growth and bilateral asymmetry of thyroid gland were studied in 291 fetuses (from 219 to 31,300 g) of the black-white cattle divided into 4 groups according to body weight. Relation between body weight (X) and thyroid weight (Y) was described using allometric equation Y = aXb. Allometric coefficient b was different in each of the four groups (1.198; 1.179; 1.314; 0.941) and amounted to 1.076 for the entire fetal period. The coefficient of fluctuating asymmetry of the thyroid gland decreased with increased fetal weight in the following way: 0.16; 0.10; 0.09; 0.07; this coefficient amounted to 0.02 for all the fetuses examined.
Szuba
Z
Z
Department of Zoology, Faculty of Animal Husbandry, Agricultural University, Szczecin, Poland.
Kalisińska
E
E
Melosik
M
M
D000818:Animals; D001835:Body Weight; D002417:Cattle / Q000196:embryology*; D005314:Embryonic and Fetal Development; D005260:Female; D005333:Fetus; D008297:Male; D009929:Organ Size; D013961:Thyroid Gland / Q000033:anatomy & histology / Q000196:embryology*