Metabolic status and ultrasound traits of reproductive tract of estrus dairy cows in early postpartum period

Metabolic status of dairy cows influences reproductive tract and fertility in postpartum period. A study with 89 estrus dairy cows was performed to study the relationships among the concentration of metabolic hormones and ultrasound traits of genital system in heat dairy cows. Cows in estrus were examined with transrectal ultrasonography and palpation, and their blood samples were collected nearly to the time of insemination. Ultrasonography images of the uterine horns, ovarian follicles, and corpus luteum were recorded and interpreted. The concentration of insulin-like growth factor-1 (IGF-1), non-esterified fatty acids (NEFA), and β-hydroxyl butyric acid (BHBA) was determined in the serum samples of estrus cows. This study indicated that the correlation between ultrasound traits of uterus and metabolite hormones was not significant at the clean test in estrus dairy cows. Moreover, there was no relationship between serum level of IGF-1, NEFA, and BHBA with either dominant follicle diameter or existence of corpus luteum (CL). Significant association between ultrasound properties of the uterus and ovaries and metabolic hormone (IGF-1, NEFA, and BHBA) concentrations did not reveal in estrus dairy cows at day 28 ± 3 postpartum. © 2019, Springer-Verlag London Ltd., part of Springer Nature.