CONDIÇÕES UTERINAS E SUA RELAÇÃO COM AS TAXAS DE CONCEPÇÃO E PERDA EMBRIONÁRIA

Abstract

This study evaluated the effect of the interval between calving and the start of the FTAI protocol (PPI-D0), body condition score (BCS), estrus expression (ESCT), AI technician, farm, and bull on the conception rate and pregnancy losses in primiparous Bos indicus cows submitted to FTAI protocols. Two experiments were conducted on farms in the Center-West of Brazil, including 3,738 Nelore cows from commercial farms. In experiment 1 (n=3,462) precocious (PP - 24 months old) and conventional (PC - 36 months old) primiparous cows were evaluated. The PPI-D0 of the assessed heifers ranged from 20 to 100 days.The conception rate was 52.9% (606/1145) for PP cows and 53.7% (1244/2317) for PC cows (P=0.42). Pregnancy losses (PL) were affected by animal category (P4%. Uterine and vaginal health can benefit from the use of PGF2α at the beginning of the FTAI protocol in PP cows.