This research aimed to evaluate the monensin effect on protein degradation of soybean meal, wheat middlings and corn meal. The rumen fluid was taken from a fistulated steer fed a 40% concentrate diet. The incubations were done in an anaerobic environment at 39ºC. It was used 100 mg of each feedstuff, 14.7 mL of ruminal fluid and 0.3 mL of ethanol with or without dissolved monensin (5 µM was the final concentration). The soybean meal, compared with wheat middlings and […]

The objective of the present study was the fractionation and the degradation kinetics of the nitrogenous compounds and of the carbohydrates of the sugar cane, poultry litter and cottonseed meal. The non-protein nitrogenous compounds, soluble and insoluble nitrogen in borate-phosphate buffer, neutral detergent and in acid detergent insoluble protein nitrogen were analyzed for the determination of the nitrogen fractions. The degradation rates of the protein fractions were obtained by the In vitro incubation of the feeds with proteases isolated from […]

The objective of this study was to develop equations to predict chemical body composition from zebu cattle, based on chemical composition from carcass representative section. Sixty-three young bulls from Gyr, Guzera, Nellore and Mocho de Tabapuã breeds were used. Body content of protein, fat and minerals were determined on samples from the carcass section that included the 9th, 10th and 11th rib joint (HH joint), and from the remaining body tissues. Protein, fat, energy and ash contents from the HH […]

A survey on the somatic cell count (SCC), fat, protein, lactose and total solids percentages on bulk tank milk samples, from December 1996to July 1998, was used to characterize the milk composition as determined by SCC. Data of 4785 from the database were classified according to the SCC, in four groups (Group 1, SCC < 500 thousand cells/mL; Group 2, 500 < SCC < 1.000 thousand cells/mL; Group 3, 1.000 < SCC < 1.500 thousand cells/mL; Group 4, SCC > […]

This research had as objective the evaluation of the acidity effect (pH) by adding increasing levels of corn starch on the degradation of hydrolyzed casein (Tripticase). The rumen fluid was taken from a fistulated steer in a 40% concentrate diet, and centrifuged at 500xg in 15 minutes to remove feed particles and protozoa. The incubations were done in an anaerobic environment at 39ºC in Vacuntainer® tubes. It was used 150 mg of tripticase and 0, 25, 50, 75, 100, 200 […]

The ingestive behavior patterns were evaluated using nine sheep 1/2 Texel+1/2 Ile-de-France over a six-month period. Sheep were fed the diet at 9 a.m. and 4 p.m., which was composed by 250 g of concentrate (15.45% CP, 36.54% NDF) and ad libitum grass hay (6.69 % CP, 69.10 % NDF). The ingestive behavior was continuously measured by five days per period, and its activities or states were classified as eating, ruminating or idling, and sequentially registered. The time series was […]

The objective of this work was to evaluate the effects of five dietary concentrate levels (25.0, 37.5, 50.0, 62.5, and 75.0%) on intake and the total and partial apparent digestibilities of dry matter (DM), organic matter (OM), crude protein (CP), ether extract (EE), total carbohydrates (CHO) and neutral detergent fiber (NDF). Five rumen, abomasum and ileum fistulated F1 Limousin x Nellore bulls, with average initial weight of 279 kg were used, in a 5 x 5 Latin square design, with […]

The ingestive behavior patterns were evaluated in nine sheep 1/2 Texel + 1/2 Ile-de-France over a six month period. Sheep were fed the diet at 9 a.m. and 4 p.m., which was composed by 250 g of concentrate (15.45% CP, 36.54% NDF) and ad libitum grass hay (6.69% CP, 69.10% NDF). Ingestive behavior was continuously measured for five days per period, and its activities or states were classified as eating, ruminating or idling, and sequentially registered. The probability estimates incorporated […]

This paper evaluated the parameters of Gompertz nonlinear function to describe Guzera male and female growth curve, and their crossbreds (3/4Guzera – 1/4Brown Swiss, 1/2Nellore – 1/4Brown Swiss – 1/4Guzera, 1/2Brown Swiss – 1/2Guzera, 1/2Chianina – 1/4Brown Swiss – 1/4Guzera, 1/2Caracu – 1/2Guzera, 1/2Caracu – 1/4Brown Swiss – 1/4Guzera) submitted to three levels of supplementation: without supplementation, supplementation only during the dry season, and year-round supplementation. There were significant interactions between supplementation and breed, and breed and sex on mature […]

The objective of this work was to evaluate the average daily dry matter intake (DMI), DMI per 100 kg of live weight (DMIP), DMI per unit of metabolic weight (DMIM), feed: gain (FG) and average daily weight gain (ADG) of beef calves fed with different levels of crude protein in the diet. Forty-seven Braford intact male calves, 66 days old and 76.4 kg of live weight were used. Animals were full fed with oat silage and concentrate (50/50), with 13; […]