DINÂMICA DO FLUXO SANGUÍNEO EM CORPOS LÚTEOS DE VACAS NELORE GESTANTES E NÃO GESTANTES AOS 7 E 21 DIAS

Abstract

The objective of this study was to evaluate the dynamics of blood flow in corpus luteum (CL) of pregnant and non-pregnant nelore cows in different evaluation periods, 7 and 21 days, after the implementation of a fixed-time artificial insemination protocol (IATF). For the realization of 48 cows were used which were synchronized to ovulate and be inseminated in a synchronized manner, after the IATF these cows were evaluated by means of ultrasound examination using a portable device equipped with mode B and Power Doppler (Mindray DP 30 Vet Power, Shenzhen, China). For B-mode assessments a transrectal transducer with a frequency of 7.5 Mhz was used. In the Power Doppler mode, the settings were adjusted at the frequency of 5 Mhz with gain patterns of 52% and pulse repetition frequency of 1.2KHz and depth of seven centimeters. The evaluations of morphofunctional structures, including the corpus luteum, were performed by ultrasound on days 7, 21 and 35 after IATF. On the 35th day, the cows had their pregnancy diagnosis definitive and were divided into two groups: pregnant (n = 20) and non-pregnant (n = 28) and so subsequent blood flow assessments were assessed: total area of ​​CL, internal perfusion and total perfusion. With a significant decrease in the total area being detected and of the perfusion of the CL at 21 days to 1.47 ± 0.51 cm² and 2.65 ± 5.26% respectively. But at 7 days total Area values, internal perfusion and total blood flow of corpus luteum cows not there is no significant difference (p> 0.05) in the CLs of pregnant cows at 7 and 21 days, may lead to the prediction of false positive pregnancy diagnoses in cows with the Power tool Doppler