Hemodynamic evaluation of mammary development and its relationship with body performance crossbred murrah buffaloes during pregnancy

• Published in: CES medicina veterinaria y zootecnia Vol. 11; no. 3; p. 153
• Main Authors: Dantas, Ariane, Oba, Eunice, Vasconcelos Machado, Vânia Maria, Antônio de Oliveira, Rogério, Jorge Mendes, André, de Soutello Charlier, Murilo Gomes, Furtado Zorzetto, Mariana
• Format: Journal Article
• Language: Spanish
• Published: Universidad del CES 01-09-2016
• Subjects: Analysis; Arteries; Blood flow; Body weight; Pregnant women
• ISSN: 1900-9607; 1900-9607

The aim of the study was to evaluate hemodynamic parameters of the mammary arteries and relate them to the body weight gain of buffaloes during pregnancy. We used 6 pregnant crossbred Murrah buffaloes 24 months old. Every 28 days, Doppler ultrasound of cranial and caudal mammary arteries was held and determined resistivity index (RI), pulsatility index (PI) and internal vessel diameter (ID) and, additionally, animals were weighed and given the body weight (BW) expressed in kilograms (kg). The animals were evaluated from the first to the last month of pregnancy. For statistical evaluation of hemodynamic indices, we used analysis of variance, considering repeated measurements over 12 months and Pearson correlation, and considering P<0.05. There was a progressive decrease in RI and PI values and an increase in ID in both mammary arteries when the first was compared to the last month of the study. However, the left mammary caudal artery showed a significant difference to the hemodynamic values, being observed lower RI (P<0.0001) and higher ID (P<0.0001), in the five and three last months of the trial period, respectively. Significant correlation was found, high and positive between RI and PI (r= 0.83; P<0.0001) and significant, high and negative of RI with DI (r= -0.74; P<0.0001) as well as significant, moderate and negative PI with ID (r= -0.66; P<0.0001). BW had linear effect on RI ([R.sup.2] = 0.44; P= 0.0019) and PI ([R.sup.2] = 0.35; P= 0.0013) and quadratic influence of BW on ID ([R.sup.2] = 0,59; P= 0.0001). It was found that significant hemodynamic changes at the end of pregnancy infer the possible increase in the adaptability of the mammary tissue, according to the metabolic demand of the gland. Therefore, hemodynamic indices vary with the physiological state and they may be considered as reference for the evaluated species.