Douglas Sampaio Henrique
Universidade Federal de Viçosa
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Revista Brasileira De Zootecnia | 2001
André Luigi Gonçalves; Rogério de Paula Lana; Marcelo Teixeira Rodrigues; Ricardo Augusto Mendonça Vieira; Augusto César de Queiroz; Douglas Sampaio Henrique
The objectives of the present study were to characterize nictemeral pattern of ruminal pH and feed behavior of dairy goats fed diets presenting different ratios of roughage:concentrate. Five non pregnant non lactating goats, ruminally cannulated, and averaging 58 kg were used during the five experimental periods. A 5x5 Latin square was used to evaluate five treatments consisted of roughage to concentrate ratio of 100:0, 80:20, 60:40, 40:60 e 20:80. Diets were fed every 6h in order to reduce ruminal pH variation during the 24h period. After adaptation to experimental diets, a 48h period was given to measure ruminal pH hourly for 24h, to be used as a covariate, following a study of feeding behavior where measurement was taken at every 10 minutes for the remaining 24h period. It was observed that increasing level of concentrate resulted in reduction of pH, especially when concentrate accounted for more than 60%. Treatment effect was also observed on time spent eating, ruminating and idling. Time spent eating was greater as percentage of roughage in the diet increased, especially over 60%. Roughage content of 100% presented the highest value of rumination time and the lowest value for idle, following diets containing 80 e 60% respectively. There were no difference between diets containing 40 e 20% roughage, which presented the lowest value for rumination and the highest for idle time.
Revista Brasileira De Zootecnia | 2005
Douglas Sampaio Henrique; Ricardo Augusto Mendonça Vieira; Pedro Malafaia; Maurício Cordeiro Mancini; André Luigi Gonçalves
Data of 320 animals were obtained from eight comparative slaughter studies performed under tropical conditions and used to estimate the total efficiency of utilization of the metabolizable energy intake (MEI), which varied from 77 to 419 kcal kg-0.75d-1. The provided data also contained direct measures of the recovered energy (RE), which allowed calculating the heat production (HE) by difference. The RE was regressed on MEI and deviations from linearity were evaluated by using the F-test. The respective estimates of the fasting heat production and the intercept and the slope that composes the relationship between RE and MEI were 73 kcal kg-0.75d-1, 42 kcal kg-0.75d-1 and 0.37. Hence, the total efficiency was estimated by dividing the net energy for maintenance and growth by the metabolizable energy intake. The estimated total efficiency of the ME utilization and analogous estimates based on the beef cattle NRC model were employed in an additional study to evaluate their predictive powers in terms of the mean square deviations for both temperate and tropical conditions. The two approaches presented similar predictive powers but the proposed one had a 22% lower mean squared deviation even with its more simplified structure.
Revista Brasileira De Zootecnia | 2009
Ricardo Augusto Mendonça Vieira; Artur José Cabral; Paulo Marcelo de Souza; Alberto Magno Fernandes; Douglas Sampaio Henrique; Gabriela Soares Carvalho Pamplona Corte Real
Dois sistemas de producao de caprinos leiteiros praticados de acordo com o modelo familiar foram avaliados quanto a geracao de renda. Um teste para verificacao de viabilidade economica do empreendimento foi executado utilizando-se dados coletados de agosto de 2004 a julho de 2005. As fazendas, denominadas A e B, eram pequenas propriedades produtoras de cabras Saanem em sistema intensivo. Indices de rebanho, rendas, impostos, combustivel, energia, concentrado, custos de oportunidade e capital de interesse foram computados para estimacao da renda liquida e da taxa de retorno do capital para avaliacao do quanto o negocio pode ser atraente em geracao de renda. Os indices de rebanho foram afetados significativamente pelas decisoes tomadas pelos administradores e interferiram sobre as quantidades e tendencias relacionadas a producao de leite. Na unidade B, a variacao sazonal reduziu com a inducao de cio, uma pratica nao realizada na unidade A. O ganho de peso diario das cabritas apos a desmama (89 e 76 g/dia para A e B) foi baixo em comparacao as recomendacoes atuais. As medias dos registros de lactacao (441 e 606 L/cabra) e fertilidade (86,95 e 85,71%) estiveram nos limites preconizados na literatura. Tarefas diarias na unidade B consumiam 5 horas e 55 minutos para producao media de leite de 40,9 L/dia, enquanto na unidade A correspondiam a 8 horas e 16 minutos diarios para producao media de 32,2 L/dia. A unidade B apresentou custo total de producao (R
Revista Brasileira De Zootecnia | 2006
José Antônio de Freitas; Augusto César de Queiroz; Alecssandro Regal Dutra; Ricardo Augusto Mendonça Vieira; Rogério de Paula Lana; Fernando de Paula Leonel; Douglas Sampaio Henrique; Adhemar Ventura de Lima; Júlio César de Souza
0,79548/L) menor que o da unidade A (R
Revista Brasileira De Zootecnia | 2008
Edizio Santos Junior; Ricardo Augusto Mendonça Vieira; Douglas Sampaio Henrique; Alberto Magno Fernandes
1,50239/L), mas operava de forma lucrativa. A unidade A apresentou margem bruta positiva (R
Revista Brasileira De Zootecnia | 2006
José Antônio de Freitas; Augusto César de Queiroz; Alecssandro Regal Dutra; Ricardo Augusto Mendonça Vieira; Rogério de Paula Lana; Fernando de Paula Leonel; Douglas Sampaio Henrique; Adhemar Ventura de Lima; Júlio César de Souza
0,284/L), mas nao operava de forma lucrativa. A renda gerada em B era equivalente a um salario mensal de R
Revista Brasileira De Zootecnia | 2001
André Luigi Gonçalves; Rogério de Paula Lana; Marcelo Teixeira Rodrigues; Ricardo Augusto Mendonça Vieira; Augusto César de Queiroz; Douglas Sampaio Henrique
732,96 (US
Revista Brasileira De Zootecnia | 2011
Emilyn Midori Maeda; Lúcia Maria Zeoula; Clóves Cabreira Jobim; Franciele Bertaglia; Roberto Cornelis Jonker; Luiz Juliano Valério Geron; Douglas Sampaio Henrique
278,52), renda competitiva se comparada ao salario minimo brasileiro, de R
Revista Brasileira De Zootecnia | 2001
André Luigi Gonçalves; Rogério de Paula Lana; Marcelo Teixeira Rodrigues; Ricardo Augusto Mendonça Vieira; Augusto César de Queiroz; Douglas Sampaio Henrique
300,00 (US
Revista Brasileira De Zootecnia | 2014
Alberto Magno Fernandes; F. Deresz; Douglas Sampaio Henrique; Fernando César Ferraz Lopes; Leonardo Siqueira Glória
114,00) por mes. Estes resultados corroboram a hipotese de que a producao de caprinos leiteiros serve adequadamente ao modelo de producao familiar e gera renda competitiva.