PSVI-1 Effects of Rumen-Protected Methionine on Reproduction and Body Temperature of Nelore Cows in hot and Humid Environments

Abstract This study aimed to evaluate the effects of dietary supplementation rumen-protected methionine (RPM) on body temperature and conception rate Nelore cows exposed high humidity index (THI) values. was realized a commercial beef farm located in north Brazil (5º 31’ 39” S, 48º 49’ 18” W). At d-31, 31 days before FTAI protocol, total 563 lactating multiparous were divided into two treatments, with three blocks each, control group (CG) (MG). Both groups kept tropical pastures received mineral supplement. The MG Group supplemented 3g RPM/100g during 77 days, expected supplement intake both 100g/cow/day. Between d0 d9 subset (n=142) remained data logger attached progesterone device, monitor intravaginal (IT) every 30 min. During period that dataloggers minimum, average, maximum THI 72.76, 78.02, 83.28, respectively. Pregnancy diagnosis 35 after artificial insemination calculated as number pregnant cows/inseminated cows. Data analyzed using JMP GLIMMIX procedure. RPM did not affect (CG = 64.36% vs. 58.19%, P >0.05). Intravaginal from day 1 8, between 0630 2030 h 2200 0100 lower (P≤0.05) for comparison CG. average IT were, respectively, 38.94ºC, 40.88ºC 39.02ºC, 41.38ºC In conclusion, reduced internal submitted environments, hottest hours day, but does rate.