The objective of this work was to evaluate two levels of calcium (.7 and 1.4%) in the diet of chicken Rhea (Rhea americana). Twelve chicken Rhea with 30 days of age were allotted in pare, in six plots with 100 m2, in a completely randomized experiment design with three replications. The feed intake was daily evaluated and the weight and the growth characteristics (length of beak, tibiotarsus and metatarsus measurements) were weekly evaluated, during 60 days. The chicken Rhea maintained […]

The objective of this work was to evaluate the effects of previous and present days open and previous dry days period fitted simultaneously as fixed effects using a sire model for 305-day milk production, still containing the fixed effects of herd-year-season, genetic group, age of cow and the random effects of sire and cow. An additive relationship matrix that included the bull, its sire and its mother was used. The same model with the exclusion of the age of cow […]

In this work, a 19KDa, male specific protein, from bovine spermatozoa, was purified using gel filtration chromatography. A monoclonal antibody (Mab) developed (C11F) against this protein discriminated two populations of spermatozoa, as revealed by immunofluorescence in microscopy and flow citometry. The epitope recognized by Mab C11F was present in 49.7% of spermatozoa population. When added to fresh bovine semen, the Mab C11F reduced the motility and promoted agglutination of the spermatozoa.

This work was carried out to evaluate the agronomic characteristics (bedding, breakage, and productivity) and the chemical-bromatological of the green matter and silage of 19 cultivars of maize. The treatments were applied on 5 x 4-m plots arranged in a randomized block design with four replications. By the ocassion of sowing, doses corresponding to 500 kg/ha of the formula 4-14-8 (N-P2O5-K2O), were applied and at the 47 day of emergency, 60 kg/ha of N in broadcast. From the studied nineteen […]

The objective of this work was to calculate correction factors for the effects of age of the dam (AOD), age of the calf (AOC) and Julian birth date (DOB) on the average daily gain (ADG) from birth to weaning period of animals of Nellore breed. The data were analyzed by restricted maximum likelihood, using the animal model. The model included the fixed effects of contemporary group (CG), AOD, AOC and DOB, and the direct effects (animal), maternal, permanent environmental and […]

The objective of this work was to study the effects of age of dam (AOD), age of calf (AOC) and Julian date of birth (DOB) on the average daily gain (ADG) from birth to weaning period of Nellore breed animals. The data were analyzed by restricted maximum likelihood, using the animal model. The model included the direct effects of contemporary group (CG), AOD, AOC and DOB, and the direct effects (animal), maternal, permanent environmental and residue. The covariates were defined […]

The objectives of this work was to evaluate possible changes in the morphological measurements among genetic groups (GG) Indubrazil, Nellore and Tabapuan and among the GG of their daughters F1 Holstein x Indubrazil (HxI), Holstein x Nellore (HxN) e Holstein x Tabapuan (HxT), besides the heritability estimates coefficients (h2) for these traits. Least square method was used to verify the differences on the morphological traits among GG and to obtain h2 estimates from dam-daughter regression (RFM). The REML method was […]

The objective of this research was to determine the correlation among hormone levels at 2- and 6-month of age and diameter and histology of the testis in Angus x Charolais young bulls at 6 months (n= 15). At two months, two basal blood samples were collected at 1-h intervals. After the last collection, the animals received 5 mg of GnRH and 1.5 and 3.0 h later, new samples were collected. At 6 months, the young bulls were treated with 1 […]

The objective of this work was to evaluate five control systems of native vegetation and the damages caused by cattle and sheep to trees of three eucalyptus populations. A split-plot experimental design in two randomized complete blocks was used. Treatments were a) three populations of Eucalyptus saligna Smith. (204, 400 and 816 plants/ha) as the main plots; b) five control systems of the native vegetation (without control, pre-emergent herbicide, pre and post-emergent herbicides, cattle grazing or sheep grazing) as subplots. […]

This work was to evaluate the effects of different forage levels in the diet on the efficiency of metabolizable energy (ME) utilization for maintenance and weight gain, and the requirements of ME, total digestible nutrients (TDN) and metabolizable protein (MP). Forty-four pure Holstein bulls calves, 60 days old with initial average live weight (LW) of 78 kg were used. Eight reference animals were slaughtered at the beginning of the feeding trial. The remaining 36 animals were allotted in the treatments […]