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| Souza,Evaristo Jorge Oliveira de; Valadares Filho,Sebastião de Campos; Guim,Adriana; Valadares,Rilene Ferreira Diniz; Marcondes,Marcos Inácio; Véras,Antonia Sherlânea Chaves; Amaral,Paloma de Melo; Santos,Tathyane Ramalho. |
| The objective of this study was to determine the energy nutritional requirements for females of Nellore, Nellore × Angus and Nellore × Simmental fed on two levels of concentrate. Sixty heifers from three genetic groups were used: 20 Nellore, 20 Nellore × Angus and 20 Nellore × Simmental. Twelve belonged to the reference group (four of each genetic group) and were slaughtered at the beginning of the experiment. Another 12 heifers (four of each genetic group) were fed on the maintenance level and 36 heifers (12 animals of each genetic group) were kept in feeding system ad libitum with 30 (six in each group) or 50% (six of each group) dry matter concentrate. Animals were randomly assigned to six treatments in a 3 × 2 factorial arrangement (three genetic... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Crossbred heifers; Maintenance; Metabolizable energy; Net energy. |
| Ano: 2012 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-35982012000300039 |
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| Fonseca,Mozart Alves; Valadares Filho,Sebastião de Campos; Henriques,Lara Toledo; Paulino,Pedro Veiga Rodrigues; Detmann,Edenio; Benedeti,Pedro Del Bianco; Silva,Leandro Diego da; Amaral,Paloma de Melo. |
| Objetivou-se avaliar as exigências nutricionais de proteína e energia de vacas nelores em lactação no período de 0 a 180 dias. Foram utilizadas 20 vacas primíparas com peso corporal médio ao parto de 362±25 kg. Quatro vacas foram abatidas logo após o parto e foram consideradas grupo referência. Do parto aos 90 dias, quatro vacas receberam alimentação restrita na proporção de 1,5% do peso corporal (PC), em porcentagem da matéria seca (MS), e 12 foram alimentadas à vontade. Aos 90 dias do pós-parto, foram abatidas oito vacas (quatro de cada oferta alimentar). Dos 90 aos 180 dias, quatro vacas foram realocadas para mantença (1,8% PC em MS) e quatro continuaram em consumo voluntário, sendo todas abatidas ao final do período. Os conteúdos corporais de proteína... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Eficiência de lactação; Energia do leite; Energia líquida; Proteína metabolizável. |
| Ano: 2012 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-35982012000500020 |
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| Santos,Stefanie Alvarenga; Valadares Filho,Sebastião de Campos; Detmann,Edenio; Valadares,Rilene Ferreira Diniz; Ruas,José Reinaldo Mendes; Prados,Laura Franco; Amaral,Paloma de Melo; Mariz,Lays Débora Silva. |
| The objective of this study was to evaluate intake, digestibility and nitrogen (N) compounds use efficiency in F1 Holstein × Zebu grazing cows. Eighteen crossbred cows (six Holstein × Gir, six Holstein × Guzerat, and six Holstein × Nellore) were used in the experiment, constituting three experimental treatments in simple random samples, under the same feeding conditions. At the estimation of individual intake at grazing, titanium dioxide was used for estimating fecal excretion and indigestible neutral detergent fiber, in order to determine pasture intake. There was effect of the lactation period on nutrient intake, except for the intakes of dry matter (DM), organic matter (OM) and total digestible nutrients (TDN) in % of body weight (BW), as well as those... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Brachiaria decumbens; Crossbreeding; Milk production; Performance. |
| Ano: 2012 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-35982012000400027 |
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