This trial aimed to characterize the ingestive behavior of Jersey dairy cows during cool and warm seasons, and at 30, 60 and 90 days post-partum. Daily time spent eating, ruminating and idling was estimated through visual observations recorded by a well trained observer. Records were made intermittently, using 10 minutes interval during 24 hours, five days per period, totalizing 30 days of observations. Ingestive behavior was recorded for each individual animal. Daily eating and rumination times were larger at warm […]

This work was carried out with the purpose to evaluate the minerals retention during the pregnancy of goats with one or two foetus. The estimate of retention was based in the difference between the total of each mineral stored in the foetus, uterus, membranes, fetals fluids and mammary gland of animals in the differents stages of pregnancy and the total of each mineral stored in the empty goats, using the model of prediction: ln Y = A – B e […]

This work was carried out with the purpose of evaluating the retention and the requirement of Ca e P minerals during the pregnancy of goats with one or two foetus. The estimate of retention was based in the difference between the total of each mineral stored in the foetus, uterus, membranes, fetals fluids and mammary gland of animals in the differents phases of pregnancy and the total of each mineral stored in the empty goats, using the model of prediction […]

The effect of four levels (0; 33; 66 and 100%) of substitution of sorghum grain (Sorghum bicolor L. Moench) by oats grain (Avena strigosa) in the concentrate of diets for feedlot finishing steers, was studied. Steers (19 months old and initial weight of 381 kg) were fed a diet containing 60% roughage and 40% concentrate, formulated for ADG of 1.2 kg/animal. During the adaptation period of seven days and in the first half of the experimental period (35 days) the […]

This work was carried out to study the effect of protein and mineral salt supplements in comparison to mineral salt on performance of growing and finishing steers, and to evaluate the availability, chemical composition and in vitro digestibility of forage during the winter. Seventy four steers were used, 37 with 266 kg of initial body weight and 37 with 377 kg of initial body weight. At the onset of the fall grass production period in May both animal groups (growing […]

This work was carried out to evaluate the recombinant bovine somatotropin effect (rBST – BST analogous, commercially obtained by recombinant DNA technique) on average daily gain (ADG), dry matter intake (DMI), organic matter intake (OMI), metabolizable energy intake (MEI) and neutral detergent fiber intake (NDFI), dry matter intake relative to live weight (DMI/LW), feed:gain ratio (F/G), carcass dressing percentage (CDP), dry matter apparent digestibility (DMAD), organic matter apparent digestibility (OMAD), crude protein apparent digestibility (CPAD), crude energy apparent digestibility (CEAD) […]

This work was carried out to evaluate the recombinant bovine somatotropin effect (rBST – BST analogous, commercially obtained by recombinant DNA technique), on hematological aspects (hematocrit, erythrocyte, hemoglobin, leukocyte, neutrophil, eosinophil, lymphocyte and monocyte) and metabolites (glucose, insulin, IGF-I, triglycerides, total cholesterol and urea) in heifers blood. Twenty-four crossbred heifers were used (½ Nellore x ½ Red Angus), they were approximately 18 months old and 225 kg of average body weight. All animals were fed with corn silage, citrus pulp […]

The objective was to evaluate the equations system for determination of the TDN of six forages (corn silage, sugar cane with 1% urea, coastcross grass hay 1, coastcross grass hay 2, tifton grass haylage and elephant grass) and 12 concentrate feeds (corn grain ground, sorghum grain ground, corn germ, wheat bran, rice bran, babaçu meal, soybean meal, cotton meal, cotton seed, corn gluten, corn gluten meal and soybean hull) were determined using sheep as experimental animals. Forages and concentrates feed […]

The objectives of this paper were estimate the energy values of feeds through equations proposed by NRC, from feed composition present in data base of “Brazilian Tables of Feed Composition for Cattle” and of a trial that used sheep, and validate those equations from observed values of TDN, digestible fractions of NDF (DNDF), crude protein (DCP), ether extract (DEE) and nonfiber carbohydrates (DNFC), that were obtained on Brazilian Scientific literature through in vivo experiments at maintenance level. The procedure to […]

This work was carried-out to study the effect of substitution levels of corn (COR) by cassava by-product flour (CPF) (25, 50, 75 and 100%) in the ration for sheep on voluntary intake, nutrients apparent digestibility and nitrogen (NB) and energy (EB) balance, pH and ammonia concentration (N-NH3) in ruminal liquid. Four male, castrated sheep, without defined race, with medium weight of 41.4 AW, in trial of digestibility were used, using the method of total collect feces and urine. The animals […]