2014-09-102014-09-102009CARDOSO, Robson Pinto. Avaliação do ganho de peso e aspectos reprodutivos de primíparas zebuínas suplementadas com uréia no período seco. 2009. 47 f. Dissertação (Mestrado) - Universidade Federal do Pará, Núcleo de Ciências Agrárias e Desenvolvimento Rural, Empresa Brasileira de Pesquisa Agropecuária, Universidade Federal Rural da Amazônia, Belém, 2009. Programa de Pós-Graduação em Ciência Animal.https://repositorio.ufpa.br/handle/2011/5670This study aimed to evaluate the productive and reproductive performance of cow cutting, supplemented with urea in the dry season. We used 58 females Tabapuã x Nellore crossbred, pregnant, with a mean age of 39 months and average weight of 399 kg. The worm and experimental animals were divided into two groups, in an area of 50 ha of grass Brachiaria brizantha cv Marandu, with 25 ha for each group, one group (A) supplemented with mineral and another (B) with mineral enriched with urea, the ratio of 80:20 (salt: urea). During the months of August-November, when most of the year in the dry, the grass had on average 5,800 kg of dry matter per hectare to 6.2% crude protein. These mixtures were administered in mineral cochos covered in order to meet ad libitum consumption during the dry period. The experimental design was completely randomized to two treatments. Difference was observed for final body weight (PVF) between the treatment with salt and mineral supplementation with urea, with average values of 360.1 kg and 385.8 kg, respectively. Difference was also observed for average daily gain, with an average of 0.465 kg/an/day for the treated group and 0.284 kg/an/day for the control group, postpartum with a gain of 41.2 and 26.5 kg/animal, respectively. The best performance of the supplemented animals should be related to the increase in dry matter intake promoted by supplementation with urea (12.610 kg to 8.744 kg). The best body growth (weight and body score) to the beginning of the amounts reflected in the expression of heat these animals, whereas 75% of cows supplemented with urea had expressed estrus during the first 60 days from the amounts to only 53, 33% of nonsupplemented. When we evaluated the whole period from the mount was not observed difference between the expression of estrus in females supplemented or not, a fact related to good body score submitted by the end of the animal to mount, 3.7 in females supplemented and 2, 9 in non-supplemented.porAcesso AbertoBovinoReprodução animalBrachiaria brizanthaVacaCapim braquiáriaAlimentação e raçõesProdução animalAvaliação do ganho de peso e aspectos reprodutivos de primíparas zebuínas suplementadas com uréia no período secoEvaluation of the weight gain and reproductive aspects of primiparous zebu supplemented with urea in the dry seasonDissertaçãoCNPQ::CIENCIAS AGRARIAS::ZOOTECNIA::NUTRICAO E ALIMENTACAO ANIMAL::AVALIACAO DE ALIMENTOS PARA ANIMAISCNPQ::CIENCIAS AGRARIAS::ZOOTECNIA::PRODUCAO ANIMAL