ABSTRACT – Data from 573 primiparous lactating Gyr cows were used to estimate the (co) variance components of the conformation traits, milk production up to 305 days of lactation (MP) and age at first calving (AFC) by REML method. These components were used to calculate heritability coefficients and genetic, phenotypic and residual correlations. The conformation measures, the heart girth (HG), croup height (CH), body length (BL), teats length (TL), teats diameter (TD) and udder height (UH) were obtained in the […]

ABSTRACT – This experiment was carried out in two phases to study the effect of different heating systems on the productive and bioeconomical performances in broilers. Five hundred one-day broiler chicks, 50% male and 50% female, in each protected circle, were allotted to a randomized block design with seven treatments and four blocks. The heating systems were: fiber glass plate without plastic sheet cover, fiber glass plate with plastic sheet cover; built-in floor resistance without plastic sheet cover, built-in floor […]

ABSTRACT – The objective of this work was to determine the best level of replacement of corn by wheat with 0 and 9% of germinated grains (GG) in broiler chicken diets. A mashed diet (MD) at the initial phase (0 to 21 days), crumbled diets (CD) at the growing phase (21 to 35 days) and pelleted diets (PD) at the final phase, (35 to 42 days) were used. A randomized block design with five treatments and 12 replicates with 26 […]

ABSTRACT – This experiment was carried out to determine the endogenous fecal losses of P and the effect of phytase on the biological availability of P in the diets and in the whole rice meal (WRM) for growing swines, by means of the isotopic dilution technique. The barrows were allotted to a complete randomized experimental design, with four treatments and three replicates. The treatments consisted on two diets without WRM (with or without 1250 FTU [Unit of Phytase Activity]/kg diet), […]

ABSTRACT – The effect of environmental temperature on performance and carcass characteristics in broilers pair-fed and two levels of metabolizable energy was evaluated. One hundred and sixty Hubbard male broilers, with 21 days of age and 791±4.12 g average initial weight were allotted either under thermoneutral environment (23.3±0.58ºC) or under hot environment (32.3±0.31ºC) up to 42 days of age. A completely randomized design in a 2 x 2 factorial arrangement (level of metabolizable energy [3075 and 3300 kcal of ME/kg] […]

ABSTRACT – This experiment was conducted to evaluate the use of low nutritional quality corn grain, infested with insects or fungi on the performance of broilers in starter diets. A total of 400 not sexed Ross chicks was allotted to a completely randomized design with five treatments and four replicates, according to the corn grain quality used in starter diets (1 to 28 days). The non infested corn was used in the control diet, and substituted by levels of 20 […]

ABSTRACT – The present work was conducted to evaluate the effect of constant thermal environment on the performance and physiological traits of barrows from 30 to 60 kg LW. A total of 100 animals were allotted to a randomized block design, with five treatments (3100, 3250, 3400, 3550 and 3700 kcal of DE/kg of diet), five replicates and two animals per experimental unit. Weight gain, intakes of diet, protein and energy and feed:gain ratio and the efficiencies of protein and […]

ABSTRACT – This work was conducted to evaluate the effects of different concentrate levels on the voluntary intake and the apparent total and partial digestibilities of dry matter (DM), organic matter (OM), ether extract (EE), neutral detergent fiber (NDF) and total carbohydrates (TCH), in the rumen and in the intestines. Five rumen and abomasum fistulated Holstein calves, with initial average age of 5.8±0.7 months and initial average of 107.4±11.0 kg LW were allotted to a 5×5 Latin square design (treatment […]

ABSTRACT – This work was conducted to evaluate the effects of different concentrate levels on the parameters of at ruminal fermentation, the apparent, total, ruminal and intestinal N digestibilities, the microbial efficiency and the N balance. Five rumen and abomasum fistulated bull Holstein calves, with an initial average age of 5.8±0.7 months and initial average of 107.4±11.0 kg LW were allotted to a 5×5 Latin square design (treatment x period). The animals were housed in individual stalls and full fed […]

ABSTRACT – This work was conducted to evaluate the effects of different concentrate levels on the liquid passage rates, using Co-EDTA, and particulate, using ytterbium chloride and Cr-mordant, and the in situ ruminal degradation kinetics of dry matter (DM) and crude protein (CP). Five rumen and abomasum fistulated bull Holstein calves, with an initial average age of 5.8±0.7 months and initial average of 107.4±11.0 kg LW were allotted to a 5×5 Latin square design (treatment x period). The animals were […]