Suplementação com sais de cálcio de ácidos graxos em vacas leiteiras mestiças em programa de IATF

Abstract

The aim of this study was to evaluate the effect of calcium salts of fatty acids (CSFA) supplementation on the morphofunctional characteristics of ovarian structures and lipid profile, as well as to correlate the productive and reproductive parameters of crossbred dairy cows submitted to a hormonal protocol for FTAI. For this, 20 crossbred lactating females were randomly divided into two groups, the control group (CON) and the treatment group (TRAT), which received concentrate with calcium salts of fatty acids for 30 days. Animals started consuming the supplement 20 days before the start of the follicular wave and ovulation synchronization protocol (Day-20). Follicular development was monitored by mode B ultrasound and power-doppler assessments every 12 hours between day D8 and the ovulation time. Follicular diameter (DFOL), area of the follicular wall (AFOL) and the area of vascularization of the follicle wall (VFOL) were all measured. On days 7 and 16 after ovulation, US mode B and doppler were performed analyzing the corpus luteum diameter (DCL), the area of the CL (ACL) and vascularization area of the CL (VCL). Also, blood samples were collected to measure serum P4 concentration. In addition, blood samples were collected to measure serum cholesterol concentration (CT), high density lipoprotein (HDL), low density lipoprotein (LDL), very low density lipoprotein (VLDL) and triglycerides (TRIG). Milk production (QL) was measured weekly and samples were collected for analysis. There was no effect of supplementation on milk production results (p = 0.15), body weight (p = 0.57), ECC (p = 0.78), albumin (p = 0.83) and lipid profile [CT (p = 0.36), HDL (p = 0.11), LDL (p = 0.55), VLDL (p = 0.15) and TRIG (p = 0.15)]. In addition, CSFA strategic supplementation 30 days before FTAI, under the conditions of this experiment, did not influence follicular and luteal morphofunctionality. Regarding the correlations between the variables, the vascularization of the follicle and CL is correlated with the size of the structures and P4 serum levels. Milk production was influenced by the morphofunctionality of CL, showing a negative correlation on the 16th day after ovulation.