The objective of this work was to evaluate the fecal excretion profile and the short term bias of the external markers chromic oxide and titanium dioxide and the internal markers indigestible dry matter (iDM), indigestible neutral detergent fiber (iNDF) and indigestible acid detergent fiber (iADF) in a digestion trial with cattle fed different diets. Fourteen F1 Red Angus × Nellore bulls averaging 12 months old and 287 kg were kept in individual stalls. The animals were fed elephant grass silage, […]

The objective of this work was to estimate the total recovering and the long term bias of the estimates of fecal excretion using the external markers chromic oxide and titanium dioxide and internal markers indigestible dry matter (iDM), indigestible neutral detergent fiber (iNDF) and indigestible acid detergent fiber (iADF) in a digestion assay with cattle fed different diets. Fourteen F1 Red Angus x Nellore averaging 12 months and 287 kg were used. The animals were fed with elephant grass silage, […]

The effect of replacing increasing levels of high-energy cottonseed meal (0, 8.7, 17.4, 26.1 and 34,8% DM) with soybean meal in concentrate for cows in the final lactation third on intake, nutrient digestibility, nitrogen efficiency and milk yield was assessed. Five crossbred 5/8 Holstein × 3/8 Gir cows were allotted to a 5 × 5 Latin square design, with five 18-day periods (eight days for adaptation and 10 days to determine intake and collect samples). The diets were formulated to […]

The objective of this study was to determine the biases in estimating fecal excretion from the internal markers indigestible dry matter (DMi), indigestible neutral detergent fiber (NDFi) and indigestible acid detergent fiber (ADFi) and the external marker chromic oxide (Cr2O3) in a digestion trial with ruminants. Five crossbred Holstein-Zebu castrated males with 240 kg average weight were used. The research consisted of three twelve-day experimental periods, from which the first six days were assigned to animal adaptation. The animals were […]

The use of indigestible dry matter (iDM) and indigestible neutral detergent fiber (iNDF) as internal markers to estimate digestibility in lambs was evaluated. Data and samples were obtained from six independent digestion trials with lambs housed in metabolism cages given ad libitum different forage and concentrate feedstuffs. Indigestible residues were determined after 144 hours of in situ incubation of feed and faeces samples. Recovery rate varied from 64.8 to 108.5% for iDM, and from 49.5 to 67.9% for iNDF. As […]

The aim of this work was to evaluate the effects of in situ incubation time and particles size on the estimates of indigestible fractions of dry matter (iDM), neutral detergent fiber (iNDF), and acid detergent fiber (iADF) in cattle feeds and feces. Samples of corn grain, wheat bran, corn silage, elephant grass, sugarcane, signal grass hay, corn straw, and feces obtained from cattle fed high and low concentrate diets were used. The samples were ground through 1 mm, 2 mm, […]

The goal of the present study was to evaluate the dynamics of fecal excretion of the following digestion markers: indigestible dry matter (DMi), indigestible neutral detergent fiber (NDFi), and indigestible acid detergent fiber (ADFi) as internal markers and the external marker chromic oxide (Cr2O3). Five Holstein-zebu steers with 240 kg average weight were used in three 12-day experimental periods, being the first seven days for animal adaptation. Previously to the beginning of the experimental period, the animals were submitted to […]

The objective of this trial was to investigate the intestinal digestion of neutral detergent fiber (NDF) using different markers and the effect of sampling collection period (daytime vs. diurnal) on nutrient digestion. Four crossbred Holstein x Zebu heifers fitted with ruminal and ileal cannulas were used in this trial. Animals were housed in individual pens and fed ad libitum bermudagrass hay plus 1 kg of concentrate (27% CP). The experiment lasted 60 days with seven days for diet adaptation and […]

The objective of this work was to validate the prediction equations for neutral detergent fiber indigestible fraction (iNDF) employed by the Cornell Net Carbohydrate and Protein System (Sniffen equation) and the National Research Council (Conrad’s equation). A database with 114 observations taken from tropical grass, with lignin and indigestible neutral detergent fiber (iNDF) contents, was used. Comparison among predicted and observed values was accomplished by adjusting a linear regression model with predicted values as dependent variable and observed values as […]

The objective of this work was to evaluate the intake of neutral detergent fiber (NDF) by fedlot cattle, the principal factors that influencing this variable, and to correlate the NDF to total dry matter (DM) intake. The data published at the Brazilian Journal of Animal Science Society and Brazilian Journal of Animal Science among the years of 1991 and 2000, totaling 45 scientific works and 181 averages of treatments, were evaluated. The level of total digestible nutrients was negatively correlated […]