Influência do diâmetro do maior folículo na taxa de prenhez de vacas Nelore de elite submetidas à IATF / The largest follicle diameter influence on pregnancy rates of elite Nelore cows submitted to TAI

ABSTRACT

tThe objective was to evaluate the influence of the largest follicle diameter (DMF) in the TAI D10pregnancy rate of Nelore PO cows. 36 females were used, divided into two groups (≤ 10mm and> 10mm) in thefollowing protocol. In the D0 was introduced intravaginal P4 implant (DIB® 1g; Zoetis) and applied 2mL BE(Gonadiol®; Zoetis) IM. In D8 was removed the implant and applied 300 IU (1.5 mL) of eCG (Novormon®;Zoetis) and 2.0 mL of PGF2a (Ciosin®, Zoetis). In the D9 was applied 1mL BE (Gonadiol®; Zoetis) and 24hafter TAI was made. Females were subjected to ultrasound examination by transvaginal the D10 formeasurement of DMF. Pregnancy diagnosis was performed 30 days after TAI. Data were evaluated using SASsoftware (2009) and the pregnancy rate was compared using the chi-square test (P 10 mm was 27.7% (10/36) with no statistical difference(P > 0.05).