title: [Heart weight of the cattle (Bos taurus L.) in the middle and late periods of fetal development].
abstract: The weight heart Y-weight body relationship was studied on 219 Black-White cattle fetuses (107 females and 112 males; weight range of 1000-31,300 g). 1. The relationship in the consecutive growth periods are described by the following regression equations: middle fetal period (IIa and IIb)--IIa (n = 88, weight range 1000-3490 g) logY = 0.97 logX -- 2.05, r = 0.96; IIb (n = 68, weight range 3500-7990 g) logY = 1.04logX -- 2.29, r = 0.89; -- late fetal period III (n = 63, weight range 8000-31,300 g) logY = 1.07logX -- 2.39, r = 0.98. 2. The relationship for all fetuses, together with I prenatal period (earlier work of these authors) examined is described by the regression equation (n = 287, weight range 80-31,300 g) logY = logX -- 2.13, r = 0.99 (r -- correlations coefficient). 3. The relative heart weights are attained: IIa -- 0.72%, IIb -- 0.71%, III -- 0.77%.
mesh_terms: D000818:Animals; D002417:Cattle / Q000033:anatomy & histology* / Q000196:embryology; D005314:Embryonic and Fetal Development; D005260:Female; D005318:Fetal Heart / Q000033:anatomy & histology* / Q000196:embryology; D005865:Gestational Age; D008297:Male; D009929:Organ Size
vernacular_title: Masa serca bydła domowego (Bos taurus L.) w środkowym i późnym okresie rozwoju płodowego.