The Cornel Net Carbohydrate and Protein System model version 5.0 was assessed as for its prediction of dry matter intake and milk production of grazing lactating Holstein × Zebu cows. Eight lactating cows grazing elephant grass (Pennisetum purpureum, Schum., cv. Napier) were used in two experiments of 30 days each. The experimental design was of randomized blocks (subplots). Dry matter intake was estimated using the chromium oxide and in vitro dry matter digestibility techniques. The estimated dry matter intake was […]

The effect of two herbage allowances (25 and 40 kg dry matter/cow.day) were assessed on the herbage intake and milk yield of dairy cows grazing Italian ryegrass. A rotational grazing system was used, according to a Change Over procedure with three 12-day periods and ten Holstein cows in mid-lactation. Individual herbage intake was estimated from fecal output and the digestibility of the selected herbage and the milk yield was measured daily. Pre-grazing sward height and herbage mass at ground level […]

The objective of the present study was to evaluate the partial and total digestibility coefficient (DC) of the nutrients, ruminal pH, ammonia nitrogen (N-NH3) concentration in the ruminal fluid and microbial efficiency synthesis in bovines fed rations containing 0, 8, 16 and 24% of brewers grains. The brewer grains were ensiled in surface silo (5,000 kg). Four Holstein cattle (480 ± 100 kg of body weight) fitted with ruminal and duodenal cannulas, were distributed to 4 × 4 Latin square […]

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 […]

It was evaluated the values of apparent metabolizable and apparent corrected energy (AME and AMEn, respectively), the coefficients of metabolization of gross energy (MCEC and MCECn) and the digestibility of DM and OM (ADDMC and ADOMC) of some feedstuffs for greater rhea averaging seven months old, by the techniques of total feces collection and chromium oxide as external marker. The experiment was analyzed as a complete randomized design with six treatments and three replications per experiment. The experiment was carried […]

In order to estimate fecal production and digesta flow of cattle, three assays were carried out using indigestible NDF and ADF as internal markers, applying in vitro and in situ incubation procedures, as well as chromium oxide as an external marker. The experiment was a randomized block design in a factorial arrangement. Indigestible NDF and ADF contents exhibited high variation despite the methodology employed (in vitro or in situ). These results indicate that, eventually, 144-h incubation time does not reproduce […]

A digestibility assay were carried out to evaluate, in consecutives periods, the total excreta collection method and the chromium oxide method as a marker. Apparent metabolizable energy corrected by nitrogen retention (AMEn) and aparent digestibility of dry matter coefficient (ADDMC) of broiler diet based in a ground corn and soybean meal containing 19% crude protein and 3.100 kcal ME/kg. Sixty adult Leghorn cockerels weigh, in average, 2.350±105 g were used. Each cockerel participates in the evaluation of the two methods […]

Dry matter intake (DMI) of nine Holstein x Zebu lactating fistulated cows was measured through difference of offered and refuse feed weight and estimated with aid of the chromium oxide (Cr2O3) for the fecal production (FO) and indigestible of the grass. The experiment was in a three Latin Squares design (3×3) and treatments constituted the supply of elephantgrass with 30, 45 and 60 days of growth. The in vitro dry matter digestibility (IVDMD) was determined in the samples of the […]

This research was conducted to compare the internal markers: indigestible neutral detergent fiber and acid detergent fiber, obtained after 144 h of in vitro (ivNDF, ivADF) and in situ (isNDF, isADF) rumen incubations; and the chromium oxide (Cr2O3) as external marker. The fecal output of dry matter and organic matter and the duodenal flow of crossbred steers, castrated and canulated in the rumen and in the duodenum. The steers were and fed with corn silage or the cassava hulls + […]