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

ResumoO coração é irrigado pelas artérias coronárias, direita e esquerda. Elas ocupam os sulcos coronários, atrioventricular e interventriculares, apresentando diferenças na distribuição, e trajeto de acordo com a espécie. O objetivo deste estudo foi verificar a dominância entre as artérias coronárias em bovinos. Trinta corações de bovinos de ambos os sexos foram analisados. Nas artérias coronárias e em seus ramos principais, injetou-se Petrolátex S-65 corado e os corações foram imersos e conservados em cubas contendo solução de formaldeído a 10% por sete dias. As artérias coronárias e seus ramos foram dissecados até as ramificações visíveis. A artéria coronária esquerda se originou diretamente da aorta em 100% dos corações em ambos os sexos. Originavam-se desta artéria o ramo interventricular paraconal e o ramo circunflexo esquerdo em 100% dos corações em ambos os sexos. O ramo interventricular subsinuoso se originou do ramo circunflexo esquerdo em 100% dos corações investigados em ambos os sexos. A média do comprimento em centímetros (cm) do ramo interventricular paraconal foi 15,50 ± 0,57 nos machos e 15,44 ± 0,60 nas fêmeas. A média do comprimento em centímetros (cm) do ramo circunflexo esquerdo foi 11,91 ± 0,43 nos machos e 11,65 ± 0,48 nas fêmeas. Os principais ramos da artéria coronária esquerda (ramo interventricular paraconal, ramo circunflexo esquerdo e ramo interventricular subsinuoso) totalizaram 85,5% considerando todos os corações estudados, de machos e fêmeas, e a artéria coronária direita emitiu 14,5% dos ramos em todos os corações estudados.Palavras-chave: coração, ramos, vascularização. AbstractThe heart is irrigated by the right and left coronary arteries. These vessels occupy the atrioventricular and interventricular coronary grooves, showing differences in the distribution and path according to the species. The aim of this study was to verify the dominance of the coronary arteries in cattle. Thirty hearts of bovines, of both sexes, were fixed in 10% formalin and the coronary arteries were cannulated and filled with stained latex S-65. Afterwards they were immersed and stored in vats containing 10% formaldehyde solution for seven days. The coronary arteries and their branches were dissected until the visible ramifications. The left coronary artery originated directly from the aorta in 100% of hearts in both sexes. This artery originated the paraconal interventricular branch and left circumflex branch in 100% of hearts in both sexes The left circumflex branch originated the Interventricular branch subsinuous in 100% of hearts investigated in both sexes. The mean and standard deviation of the length of the interventricular paraconal branch in centimeters (cm) was 15.50 ± 0.57 in males and 15.44 ± 0.60 in females. The mean and standard deviation of the left circumflex branch length in centimeters (cm) was 11.91 ± 0.43 in males and 11.65 ± 0.48 in females. The main branches of the left coronary artery totaled 85.5%, considering all samples, and the right coronary artery issued 14.5% of the branch...

The objective of this study was to evaluate the influence of the degree of uterine and ovarian development on the pregnancy rate of Girolando heifers submitted to Timed Artificial Insemination (TAI). 56 heifers, representing 100% of the category in the herd studied, were evaluated. Prior to hormonal treatment, the heifers were submitted to a gynecological evaluation employing ultrasonography, in order to measure the diameter of the uterine horns and ovaries, as well as to evaluate the presence of corpora lutea (CL) and antral follicles. Based on the finding, all animals were classified into three scores and subsequently submitted to TAI. There was no statistical difference (P>0.05) in pregnancy rates between the different uterine horn and ovarian scores, as well as in relation to ovarian structures. However, a statistical difference (P<0.05) was observed in the percentage of animals in anestrous within ovarian scores one, two and three (83.3%, 37.5%, and 42.8%, respectively). Concluding, uterine and ovarian development did not interfere with the pregnancy rate of Girolando heifers in the herd studied.

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-The objective of this study was to evaluate the reproductive parameters of Sindhi cows aiming to improve the efficiency of fixed-time artificial insemination protocols in this breed. For this purpose, sixteen Sindhi cows were divided into two groups: in group I (EB, n = 8) animals received an intravaginal P4 implant and an application of 2 mg of estradiol benzoate on day 0. On day 8 the implant was removed and 10 mg of Dinoprost were applied; on day 9, 1 mg of estradiol benzoate was applied, and animals were fixed-time artificially inseminated 36 hours later; in group II (EB + eCG, n = 8) animals were subjected to same treatment, and on day eight 400 IU of eCG were applied. From day 0 animals were examined daily by a trans-rectal ultrasound device, where in each assessment the largest follicles of each day were measured. The reproductive parameters observed for groups I and II were: emergence of follicular wave, 4.5±1.4 and 3.8±0.3 days; interval between wave emergence and ovulation, 5.8±1.4 and 7.1±0.3 days; interval between wave emergence and implant removal, 3.5±1.4 and 4.1±0.3 days; interval between implant removal and ovulation, 74.0±11.8 and 82.5±4.2 hours; diameter of the dominant follicle (DF) at the time of implant removal, 7.5±2.5 and 6.6±1.5 mm; maximum diameter of DF, 10.47±8.85 and 3.7±1.2 mm; growth rate of DF, 0.90±0.83 and 0.7±0.6 mm/day; ovulation rate, 75% and 100%; and pregnancy rate, 0% and 50%, respectively. There was no significant difference between the groups. We observed that eCG was not efficient in improving the reproductive parameters analyzed in this breed.