O objetivo deste experimento foi estudar o desempenho de borregos suplementados com dois níveis de feno de leucena (Leucaena leucocephala (Lam) de Wit), durante a estação seca, em comparação com animais mantidos em pastagem exclusiva de capim-buffel (Cenchrus ciliaris, L) ou em pastagem consorciada de capim-buffel com guandu (Cajanus cajan). Durante a estação das águas, foi determinado ainda o desempenho dos animais que foram mantidos em pastagem comum de capim-buffel, sem suplementação. Os seguintes tratamentos foram testados durante a estação […]

The objetive of this experiment was to obtain data from literature about diet composition for horses and to estimate the digestible energy and digestible protein contents by regression equations from chemical composition of these diets. Data were submitted to a correlation study among the content of nutrients in experimental diets and apparent digestibility coefficients, selecting the best correlation among DE, EAD, OMAD, CPAD and nutrients of diets. The values of EAD, OMAD and CPAD and digestible energy contents were fitted […]

In the present work, the chemical composition changes and dry matter (DM) digestibility of three cultivars (Empasc-307-Testo, Empasc-309-Areia and Roxo) of elephant grass (Pennisetum purpureum Schumach.), were measured through a growing period of 126 days. The production and quality of tropical forage grasses were determined, in part, by the growing period. The plants showed greater height and dry matter accumulation, increasing the neutral detergent fiber (NDF) and lignin concentrations and substantially reducing DM and NDF digestibility levels, with longer growing […]

The objective of this work was to verify the effect of ammoniation on the contents of crude protein (CP), nitrogen retention (NR), dry matter (DM) content, preservation, cell wall constituents and in vitro dry matter disappearance (IVDMD) of cracked corn with high moisture (25%). Four levels of anhydrous ammonia (0, 1, 2 and 3%) and five aeration periods (0, 7, 14 21, and 28 days) were studied using a completely randomized design, in a split plot design. The contents of […]

This study was carried out to analyze the influence of some environmental effects on the milk yield and calving interval and to estimate the genetic parameters at 305-day milk yield (P305), and calving interval (IP). Data from 3044 lactations of 1568 Holstein cows, calved from 1988 to 1995 belonging to dairy herds monitored by DAISY (The Dairy Information System), were used. The Least Squares Method was used to study the environment effects and the Derivative-Free Restricted Maximum Likelihood (REML) algorithm […]

This experiment was carried out to verify the effect of the administration of different doses of GnRH (buserelin) analogue on the emergence of a new follicular growth wave and the number of recruited follicles from this wave, accessory corpus luteum formation, the dominant follicle diameter and the spontaneous corpus luteum on the luteolitic administration day and subsequent synchronization rate and the interval between the PGF2α application and the estrus manifestation. Twenty crossbreed female cattle in diestrus, crossbred Holstein x Zebu […]

ABSTRACT – The objective of this study was to evaluate the effect of postmortem calcium chloride (CaCl2) injection and aging time on tenderness and cooking losses of Longissimus dorsi muscle from Bos indicus and Bos taurus animals selected for weight gain. Sixty-four young bulls (16 Caracu, 16 Guzera, 16 Nellore Control and 16 Nellore Selection) were used. Twenty four hours after slaughter a sample from Longissimus dorsi muscle, taken between the 6th and 9th lumbar vertebrae was removed and divided […]

This work was carried out to estimate the retention and the net requirements of Ca and P, in 120 goats averaging 42 kg LW. The estimate retention based in the difference between the total of each mineral stored in the fetus, the uterus, the membranes, the fetal fluids and the mammary gland of animals in the different phases of pregnancy and the total of each mineral stored in the empty goats. The model of prediction used was lnY = A […]

The objective of this work was to identify the best semen extender, the dilution rate and the storage time for rooster semen. A total of 60 roosters and 630 hens with 55 weeks of age were artificially inseminated, once a week, by six consecutive weeks, using .05 mL of semen/hen. The treatments were: T1=semen diluted with commercial extender-DC; T2 =semen diluted with Beltsville Poultry Semen Extender-BPSE; T3=semen diluted with Lake solution-LAKE and T4=pure fresh semen (Control). The dilution levels (D) […]

The objective of this work was to determine the nutritional requirement of available P and the effect of the particle size in the P bioavailability from meat and bone meal for broiler chicks. Two hundred and fifty and 450 Hubbard broiler chicks from 1 to 21 days of age, respectively, were allotted to a completely randomized design, with five (requirement) or nine (bioavailability) treatments, with five replicates and ten birds per experimental unit. The P requirements was determined by means […]