Desempenho produtivo de bezerros holandeses submetidos a diferentes idades de desaleitamento e de fornecimento de feno

• Autor(a) principal: Machado, Henrique Valentim Nunes
• Data de Publicação: 2008
• Tipo de documento: Dissertação
• Idioma: por
• Título da fonte: LOCUS Repositório Institucional da UFV
• Texto Completo: http://locus.ufv.br/handle/123456789/5578
• topic: Bezerro; Desempenho; Holstein calves; Performance; CNPQ::CIENCIAS AGRARIAS::ZOOTECNIA::NUTRICAO E ALIMENTACAO ANIMAL

There is complex interaction between feeding milk purpose, when talk about period of feeding and intake of solid feed, between concentrate intake and hay, roughages age and concentrate should be given and its interactions about the performance of calves. This work was carried on with objective to evaluate the performance and calves intake in two ages of weaning (60 to 90 days of experiment), in two ages of catering hay (15 to 60 days of experiment). The experimental period take place in the sixth day of animals life s and was used ten repetition by treatment, with forty experimental unit, 12 female and 28 male, crossbred 7/8 Holstein x Zebu it was used the completely randomized design blocks with design factorial 2x2, being two ages of weaning, with the same milk quantity catered, and two ages of hay catered. Into forty animals, 16 were slaughter to 90 days of experiment, to evaluate rumen weight and 24 animals were management together to 180 days, with the objective to evaluate the performance in the three first months of life. The dry matter intake, in Kg/day, % LW e g/KgLW0,75, along the first 90 days of experiment, was the same of all treatments, however, the feed solids intake, concentrated and hay, to animals that were receive less milk quantity in epoch determined, was great (P<0,05) to this epoch, advance the same in the dry matter intake to all calves in the half-time of 1 to 90 days of experiment. The digestibility was measured to 45 days of experiment, of protein e percentage of total digestive nutrients, such as the nitrogen compost balance, were great (P<0,05) in situation where milk was great quantity catered, dependent on each treatment. The digestibility of neutral detergent fiber was positively influenced (P<0,05) by greater roughages intake. There is not difference to treatments on microbial protein production, however, numerical value it was greater microbial protein production to animals that were intake great quantity of solids feed, in the analyzed period. The rumen weight, to 90 days was greater to animals weaning to 60 days of experiment due positive influence of intake of solids feed, which means hay was feeding, on rumen weight calves, however, this case do not have relevance to performance. In this case, the average gain daily and final calves weights were the same, when analyzed all period (1 to 90 days of experiment). This tendency keeps it to 180 days of experiment. So, conclude that to Holstein calves weaning at the beginning of hay catered should be at two month of age.