Influence of age and weight of Girolando heifers on uterine and ovarian development

Abstract

Reproduction Full-length research article Influence of age and weight of Girolando heifers on uterine and ovarian development ABSTRACT-The present study aimed to correlate the age and weight of Girolando heifers with uterine and ovarian development. Sixty heifers between 12 and 36 months old were weighed and subjected to ultrasound assessment to measure the diameters of each uterine horn and ovaries, monthly. These measures continued until their first ovulation. The animals were divided, for data analysis, according to their age into five groups: GI (12 to 14 months), GII (15 to 18 months), GIII (19 to 24 months), GIV (25 to 30 months), and GV (31 to 36 months). The dispersion diagram was used to assess the correlation between data collected monthly from uterus/ovaries and weight/age. An average daily growth of 0.0032 mm was recorded for the right ovary (RO) and 0.0051 mm for the left ovary (LO). The average size of the RO in GI was 17.58 mm and the LO was 15.28 mm; in GII, the RO was 16.72 mm and the LO was 15.89 mm; in GIII, the RO was 18.37 mm and the LO was 16.55 mm; in GIV, the RO was 19.09 mm and the LO was 17.49 mm; and in GV, the RO was 19.89 mm and the LO was 18.96 mm. The uterine horns showed an average daily growth of 0.0064 mm and 0.0071 mm for the right (RU) and left (LU) uterine horn, respectively. The average sizes of the uterine horns per group were:

Histological characteristics of a uterine hemangiosarcoma in a Brazilian Girolando cow

“…3 Another study performed with Girolando cows in Brazil showed a correlation between age and weight to ovaries and uterine development. 8 According to Garcia-Iglesias et al, the tumours are more frequent in old cows from 11 to 15 years of age. The adenocarcinomas and leiomyomas are the uterine neoplasms most commonly diagnosed in cows.…”