With the aim of altering body composition, diets with different protein levels (12 and 18 CP) were offered to breeding gilts from 100 to 221 days of age. During this period, body weight, backfat thickness, oestrus manifestation, characteristics of reproductive tract and nitrogen balance were evaluated. Nitrogen balance was measured during two metabolism trials (at 136 and at 201 days of age). In both trials, gilts fed 18% CP showed higher nitrogen intake, retention and excretion and higher plasmatic and […]

The objective of this work was to evaluate comparatively the carcass traits and body composition of young Nellore breed intact male, sons of bulls with differentials positive (Selection Lineage) or null (Control Lineage) at weight gain at 378 days of age. Data from 92 Nellore cattle, with 456.00 kg of slaughter weight, being 51 animals of Selection Lineage and 41 animals of Control Lineage. They were raised in cultivated pastures until 18 months of age, when were designated in two […]

The data used in this study are from the first five lactations of 1,406 cows of the Mantiqueira Ecotype, daughters of 113 sires, with calving from 1952 to 1997. The total milk yield (PL), fat production (PG), lactation period (DL), and days dry (PS) were obtained from NPZGJRA/IZ/APTA/SAA. Based on the genetic values predictions, for each studied feature selection differentials and genetic trends were estimated though four selection paths of selection: bulls to breed bulls (SB), cows to breed bulls […]

Silage evaluation of elephantgrass cv. Taiwan A146 was done at Faculdade de Medicina Veterinária e Zootecnia – UNESP-Botucatu. Six treatments were used with four replications as follows: A – elephantgrass with eight hours of wilting under the sun; B – elephantgrass; C – elephantgrass (98%) plus cassava meal (2%); D – elephantgrass (96%) plus cassava meal (4%); E – elephantgrass (92%) plus cassava meal (8%); F – elephantgrass (88%) plus cassava meal (12%). The efficiency meal (12%) was greater than […]

The objective of this study was to evaluate the effects of different levels of degradable intake protein (DIP) diets during the feedlot-growing phase, on performance, in vivo growth parameters measured by ultrasound and on carcass traits and meat quality of young bulls. Sixty Brangus calves, 8 months old, averaging 243,2 kg, were submitted to three treatments in growing (Phase 1) and finishing (Phase 2) phases: T1 – 69% DIP in Phases 1 and 2; T2 – 77% DIP in Phase […]

The objective of this study was to determine prediction equations for crude protein (CP) requirements for males and females broilers using the factorial method. In order to determine the crude protein for the maintenance was used the nitrogen balance technique. The crude protein requirements for weight gain were determined based on body nitrogen content and nitrogen utilization efficiency for the diet. Considering the requirements for maintenance and weight gain were elaborated prediction equations for CP requirements (g/bird/day) for males broilers […]

The evaluated animals were raised in grazing system without supplementation in the dry season, from 1988 to 1996. A total of 587 observations of days open (DO) was taken from the archives of the regional technical office of ABCZ (Escritório Técnico Regional da ABCZ) in Fortaleza – CE and from zootechical registers of the Farm Entre Rios. The GLM procedure of the SAS Program was used to analyze the data. The model included the sire of the cow random effect, […]

The in vitro/gas dry matter (DM) digestibility of four roughages, mixed or not, in proportion of 50% in the DM were evaluated. Samples of 100 mg by treatment, in triplicate, in 48 h of digestion were incubated. The DM digestibilities and gas production were: sugar cane = 60.6%, 17.3 mL; sugar cane + corn silage = 63.9%, 19.6 mL; sugar cane + elephantgrass of 60 days = 60.5%, 16.9 mL; sugar cane + elephantgrass of 180 days = 48.6%, 14.1 […]

This experiment was conducted to evaluate levels of crude protein (CP) for growing gilts, under high temperature environment. The internal temperature at room was maintained at 30.7 ± 0.61°C, with relative humidity of 66.4 ± 7.7%, and the calculated black globe humidity index (BGHI) in period was of 81.1 ± 1.36. Forty crossbred gilts, with average initial weight of 29.7 ± 1.60 kg, were allotted to an experimental design of randomized blocks with five treatments (16, 17, 18, 19 and […]

The experiment was carried out to compare the performance of two Nile Tilapia strains (Thai and common) during the initial and growing phases. The fishes (50 in the starting phase and 40 in the growing phase) were assigned to a completely randomized design with two treatments and five replications. Better results were observed for the weight gain percentage, daily weight gain, feed:gain ratio and economic viability in both experimental phases, survival in the starting phase and final size in the […]