RELAÇÃO DO ESCORE DE REMOÇÃO DE TINTA DA CAUDA (ESCT) COM O DIAMETRO DO FOLÍCULO PRÉ-OVULATÓRIO E A PRENHEZ À IATF COM SÊMEN SEXADO

The paint markers have been used successfully for the identification of the intensity of estrus expression. The objective of the present study was to evaluate the efficiency of the Paint Removal Score (PRS) as an optimization tool for FTAI with sexed semen. For this purpose, 119 Nellore cows were sed, which were submitted to a 3-progesterone-based protocol (P4). The diameter of the ovulatory follicle was measured by ultrasonography just before the AI, 60 hours after the withdrawal of the progesterone device. The pregnancy diagnosis was performed 30 days after the FTAI. The pregnancy rate (38.46%, 45.71% and 45.71%) and the diameter of the preovulatory follicle (10.07 mm, 10.55 mm and 11.54 mm) did not vary according to the intensity of the expression of estrus (ESCT1, 2 and 3). Under the conditions of this study the evaluation of the PRS 60 hours after the withdrawal of the P4 device was not an efficient strategy to optimize the results of the IATF with sexed semen, since there was no difference in the preovulatory follicle diameter and pregnancy rate between cows that showed estrus of different intensities.