ResumoO objetivo deste trabalho foi avaliar o impacto da condição corporal sobre a taxa de prenhez de vacas Nelore, rebanho comercial, submetidas a programas de inseminação artificial em tempo fixo (IATF). Foram utilizadas 181 vacas multíparas da raça Nelore, na região das baixadas litorâneas do estado do RJ, com mais de cem dias decorridos do parto, mantidas em regime de pasto e divididas em dois grupos submetidos ao mesmo protocolo de sincronização para IATF (D0-2,0mg de benzoato de estradiol + dispositivo intravaginal bovino com 1,0g de progesterona, D8-retirada do implante + 250µg de cloprostenol sódico+ 300 UI de eCG, D9-1,0mg Bz. Estradiol, D10-IATF). Os grupos foram divididos segundo escore de condição corporal (ECC com escala de 1-5) em: grupo I, n=96: vacas com ECC ≥ 3,0 e grupo II, n=85: vacas com ECC ≤ 2,5 ≥ 2,0. Todas as fêmeas foram expostas aos touros, a partir de 24 horas após a IATF para repasse, permanecendo com os mesmos até o fim da estação de monta. A taxa de prenhez total foi de 86,5% (83:96) e 65,9% (56:85) para os grupos I e grupo II, respectivamente. Os dados foram avaliados pelo teste do qui-quadrado e os resultados analisados apontam diferença estatisticamente significativa (P<0,05) entre os grupos, podendo-se concluir que as fêmeas de pior condição corporal (ECC ≤ 2,5 ≥ 2,0), apresentaram menor taxa de prenhez quando comparadas aquelas de melhor condição (ECC ≥ 3) quando submetidas a programa de IATF. Palavras-chave: Condição corporal, taxa de prenhez, IATF, vacas nelore AbstractThe aim of this study was to evaluate the impact of body condition on pregnancy rate of Nellore cows, commercial herd undergoing artificial insemination programs in fixed time (TAI). 181 cows were used multiparous Nellore, the coastal plains region of the state of Rio de Janeiro, with more than one hundred days after birth, kept on pasture and divided into two groups subjected to the same synchronization protocol for TAI (D0-2 , 0 mg of estradiol benzoate + device with 1.0 g bovine intravaginal progesterone implant removal D8-250μg of cloprostenol + + 300 IU of eCG, D9-Bz 1.0 mg. Estradiol, D10-TAI). The groups were divided according to body condition score (BCS with scale of 1-5) in Group I, n=96: BCS ≥ 3,0, Group II, n=85: BCS ≤ 2.5 ≥ 2.0. All females were exposed to bulls, from 24 hours to pass after

-The objective of this study was to evaluate the effect of prebiotic fructooligosaccharide (FOS) supplementation on the development of Mangalarga Marchador suckling foals. Sixteen Mangalarga Marchador foals, from birth to 75 days of age, were evaluated in a completely randomized design, with two treatments (experimental group and control group) with eight repetitions (animals). The foals were evaluated through body weight, morphometric, and circumferential measures. The daily, weekly, and cumulative weight gains were recorded and the morphometric measures were: withers height, croup height, body length, mid-back height, mid-back width, and thorax, shin, knee, and forearm circumferences. The mean body weight was 32.3 and 77.9 kg at birth and 75 days of age, respectively. The mean withers height was 86 and 103.8 cm at birth and 75 days of age, respectively, and the mean body length was 63.9 cm at birth, reaching 89.1 cm at 75 days of age. No significant differences in the FOS supplementation or interaction of age versus supplementation between the experimental and control groups were observed for any of the parameters evaluated. However, there were significant differences between the ages. Supplementation with prebiotic FOS does not affect the development of the Mangalarga Marchador suckling foals from birth to 75 days of age.