Postpartum hormone and energy profiles and their influence on the resumption of ovarian cyclicity in Curraleiro Pé-Duro cows

Abstract

The objective of this study was to evaluate hormone and energy profiles in the postpartum period and to correlate these profiles with the resumption of ovarian cyclicity, as well as characterizing the postpartum short estrous cycle of Curraleiro Pé-Duro cows. Twelve Curraleiro Pé-Duro cows were examined via rectal palpation and ultrasound at 10 days postpartum, and subsequently examined daily to evaluate the resumption of ovarian cyclicity as well as every five days in order to evaluate uterine involution. Upon analysis of the data, it was possible to observe the formation of two distinct groups, one of which was comprised of those animals which returned to cyclicity within 60 days postpartum and another comprised of those animals which returned to cyclicity more than 105 days postpartum. Therefore, animals were divided into two groups; precocious, designated Ov Group, and delayed, designated NOv Group, wherein the cut-off time for all tests was 60 days postpartum. Statistically significant differences (P < 0.01) between the groups occurred only regarding the day of 1st ovulation, which in the Ov Group averaged 51.4 ± 9.3 days and in the NOv Group averaged 138.3 ± 19.8 days postpartum. The other postpartum short estrous cycle variables assessed did not show statistically significant differences (P > 0.05) between the groups. NEFA, BHBA and thyroxine concentration levels did not differ (P > 0.05) between the groups in any of the statistical analyses. However, in the analysis comparing growth curves, triglycerides levels were higher for the Ov Group (P = 0.04) and cholesterol levels were higher for the NOv Group (P = 0.02). In this experiment, a small influence of a negative energy balance between the groups was observed, suggesting that these animals can present significant genetic variability due to natural selection, as evidenced by the formation of groups of animals with precocious and delayed reproductive characteristics.

Comparative biochemical profiles, production and reproduction status of the post‐partum dairy cows with and without purulent vaginal discharge

“…Based on ovarian steroid hormones, progesterone has an immunosuppressive effect, while oestradiol may enhance immunity and contributes to the bacterial elimination of the uterus (Lewis, ). Cows with high concentrations of cholesterol during the puerperium will produce greater amounts of ovarian steroid hormones, contributing to an earlier resumption of ovarian activity (Teixeira, Barbosa, Souto, Mariante, & Ramos, ). It has been reported that injury to the hepatocytes can contribute to lower synthesis of cholesterol, causing a reduction in the serum cholesterol concentration, which can contribute to a lower production of hormones that aid in ovarian activity, impairing reproduction and increasing the time the animal remains anovular (Crociati et al, ; Kessler, Gross, Bruckmaier, & Albrecht, ).…”

Postpartum perineal muscle sonogram in Madura beef cow

“…The ovarium undergoes follicle wave inhibition at the end of the gestation period, and during PP this would restart again. However, ovulation may only occur with the occurrence of the luteinizing hormone peak, which depends on energy balance [19,26]. PP cows may exhibit estrus signs even if it is rarely observed [19].…”

The association between serum testosterone levels and metabolic syndrome among women

“…Since this study tended to explore the association between TT level and MetS among the adult female population, male participants, and participants who reported less than 20 years old were excluded. Pregnant and breastfeeding participants were subject to the shift in hormone level as well as the effect on the metabolism and were thus excluded in this study [ 13 , 14 ]. Demographic characteristics included age, body mass index (BMI), and race.…”