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 aimed to evaluate different crude fiber levels on reverted Nile tilapia (Oreochromis niloticus, L) fingerlings performance and time of retention of food. One hundred and twenty-five fingerlings of Thai strain, 1.39 ± 0.03 g of initial weight were allotted to twenty-five 54 L aquarium, at five treatments and five replications on completely randomized design. Five isoenergy (3000 kcal/kg of digestible energy) and isoprotein (30% of crude protein) diets were formulated with five different crude fiber levels (3.65, 4.75, […]

The follicular dynamics and luteal regression were studied in 12 Gir and seven Nelore cows, treated with prostaglandin F2a analog, between days 10 and 12 of the estrous cycle. The synchronization rate was higher than 92% for the Gir and Nelore cows, and the ovulation of the second dominant follicle occurred in 72.7% of the Gir and all the Nelore cows. The Nelore ovulatory follicle diameter was lower than Gir cows ((11.0 ± 0.9 mm x 13.0 ± 1.7 mm). […]

This research was carried out to evaluate the use of pre-starter diets, through different periods to broilers with different first day weights. Two hundred and eighty one-day old chicks were allotted in brooded battery cages, in a completely randomized design, with six treatments and four replicates in a factorial design 2 x 3, (chicks weight – higher or lower than 40 g, and pre-starter periods of feeding, 1 to 7; 1 to 10 and 1 to 14 days). The performance […]

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 objective of this study was to reduce the level of the biological marker Cr2O3 in animal diets, due to the sensibility of the sdiphenylcarbazide spectrophotometric method for chromium determination in feces, recently developed. Six levels of marker, chromium (III) oxide (0.01% – 0.02% – 0.03% – 0.05% – 0.1% and 0.2%), were incorporated into isoproteic and isoenergetic diets, for the apparent digestibility assay of the “piauçu” (Leporinus macrocephalus), in a design of entirely randomized groups. Feces were collected during […]

153,963 test day milk yield records and 13,273 first lactations of Holstein cows calving between 1989 and 1998, were used with the objective of estimating genetic, phenotypic and environmental parameters for test day milk yield (PLDC) and 305 day milk yield (P305) and to study the convenience of using test day yields in genetic evaluations to replace P305. Four models were used. Models 1 and 2 differed according contemporary grouping and monthly milk records were considered as repeated measures. In […]

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 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) […]

Records on 6,674 Nellore cattle weight, born from 1975 to 1990 in two farms located in Paraiba State were used to study environmental effects and to estimate genetic parameters for average daily gains from birth to 205 days, from 205 to 365 days and from 365 to 550 days. The SAS® program was used to study the environmental effects. The model included the random effect of sire and the fixed effects of year-month-sex, farm and age of the cow at […]