The follicular dynamics and luteal regression were studied in 12 Gir and seven Nelore cows, treated with analog prostaglandin F2a, between day 10 and 12 of the estrous cycle. The synchronization rate was higher than 92% for the two breeds, and the ovulation of second dominant follicle occurred in 72.7% of Gir and all Nelore cows. Ovulatory follicle diameter for Nelore was lower (11.0 ± 0.9 mm) than Gir cows (13.0 ± 1.7 mm). The average intervals from treatment to […]

Four cattle breeds (Gyr, Nellore, Guzerat and Holstein) were analyzed by amplification of genomic DNA using microsatellite loci to evaluate the genetic diversity within and among them. DNA samples of 18 animals from each breed were collected to access the genetic content of them. Allele frequencies were calculated and used to generate a Nei’s genetic distance matrix what was used to build a dendrogram following UPGMA clustering. As expected, Holstein breed was the most distinct from the other breeds: 1.15 […]

The data were obtained from 51 herds to participate in the Nelore Catttle Breeding Program (NCBP) from the states of Goiás (GO), Mato Grosso do Sul (MS), Mato Grosso (MT), Minas Gerais (MG), São Paulo (SP), Maranhão (MA) and Bahia (BA). Were used to estimative genetic parameters for standardized weights at 120 (P120), 455 (P455) and 550 (550) days of age. Univariate and bivariate analysis were performed by animal model using MTDFREML program. For P120 was used a model that […]

The use of pre-pubertal calves as oocyte donors offers a considerable potential to increase the genetic gain lowering the generations interval, as well as increase the usage of bovine females with high genetic value. The objectives of this study were to analyze the effect of age and of the stimulatory treatment with gonadotropins in the follicular response, the recovery rate, quantity and quality of oocytes of the prepubertal Nelore (B. t. indicus) calves. Twelve Nelore prepubertal females were stimulated with […]

Forty crossbred sows (Landrace x Large White) from the first parturition, with average weight of 182.2 ±16.5 kg, were used to evaluate the total lysine levels (0.95, 1.03, 1.10, 1.18, and 1.25%) in the diet, maintaining the same amino acids relation, during lactation (21 days). A completely randomized blocks design, with five treatments, eight replicates, where the sow was considered the experimental unit, was used. Total feed intake did not change according to the treatments, where the sows were daily […]

Three experiments were carried out to determine the nutritive value and to evaluate the performance of growing rabbits on fed isoenergy rations containing different pearl millet levels. In a digestibility assay (experiment 1) the nutritive values of Common, BN2 and Iapar IA 98301 pearl millet were determined for 40 male New Zealand White rabbits, 45 days old, allotted in a completely randomized design, with 10 replications. Pearl millet replaced 30% of reference ration in each treatment. Values of digestible energy […]

An experiment using 60 pigs (½ males and ½ females) was carried out to evaluate the effects of the type of pens floor on the performance and carcass traits of growing-finishing pigs (33 – 84 kg). The pigs were allotted to a randomized block design, with two treatments, tree or two pigs per experimental units (EU), 12 EU per treatment and 30 pigs per treatment. They were housed in pens of 8m2 (2.0 x 4.0 m), allotted to two treatments: […]

This work aims to evaluate the passage of digesta kinetics through the digestive tract and estimate the water and nitrogen balance in horses fed different levels of roughage in diets. Four crossbred yearling were used with age of 18 months, housed in individual stalls and exercised once a day. The present experiment was performed according to a 4 X 4 Latin Square design which each experimental period had 14 days for adaptation to diet and five days for fecal collection. […]

Fourty-eight barrows proceeding from crossing between commercial hybrids were used in a study to evaluate the different lysine levels on the performance and the carcass characteristics. The swines average initial and final weight was 110.1 ± 0.72 kg and 125.3 ± 1.23 kg, respectively. The animals were distributed in an experimental design of randomized blocks with four treatments, six replicates and two animals per replicate. The treatments corresponded to a basal diet with 13.7% of crude protein and 3367 kcal […]

This experiment was carried out to estimate the requirements of total lysine and lysine: crude protein (CP) ratio to laying quails. It was used three hundred and twenty birds offspring from crossing breeding of Japanese and European quails from 60 to 144 days of age, live weight of 178+12 g, fed diet with 20 and 23% of CP, and five rates of lysine (0.80, 0.95, 1.10, 1.25 and 1.40%). A completely randomized experimental design in a factorial scheme 2×5 (two […]