Encontrados 33 documentos, a visualizar página 1 de 4
Do live or inactive yeasts improve cattle ruminal environment?
Cunha,Camila Soares; Marcondes,Marcos Inácio; Silva,Alex Lopes da; Gionbelli,Tathyane Ramalho Santos; Novaes,Marco Aurélio SchiavoABSTRACT This research was conducted to investigate the effect of live and inactive sugarcane yeast on beef cattle voluntary intake, apparent digestibility of nutrients, ruminal pH, volatile fatty acids (VFA) concentrations, and ruminal ammonia. Five rumen-cannulated Nellore heifers were distributed in a 5×5 Latin square design, with five experimental periods of 15 days, with seven days for adaptation to the ad...
Macromineral requirements of Holstein calves
Rodrigues,João Paulo Pacheco; Lima,Jéssika Carolina Moutinho; Castro,Marcelo Messias Duarte; Valadares Filho,Sebastião de Campos; Chizzotti,Mario LuizAbstract: The objective of this work was to quantify the net requirements for the maintenance (NRm) and growth (NRg), as well as the retention coefficient (RC) of calcium, phosphorus, sodium, potassium and magnesium, of Holstein calves. The NRm were 87.8, 20.8, 4.36, 2.21, and 1.01 mg kg-1 of empty body weight for Ca, P, Na, K, and Mg, respectively. The RC was 0.882, 0.473, 0.274, 0.088, and 0.052 for Ca, P, Na...
Impact of farm size on milk quality in the Brazilian dairy industry according t...
Marcondes,Marcos Inácio; Brandão,Virgínia Lúcia Neves; Ferreira,Gustavo Antônio Torres; Silva,Alex Lopes daABSTRACT: Milk produced in Brazil has been seen as having poor quality and is associated with a large number of small farms. However, there are few studies demonstrating lower quality of milk of small properties. Thus, this study aimed to evaluate the relationship between production scale on dairy farms and milk quality, how it behaviors throughout the year and set goals to improve quality according to each str...
Chemical composition and fermentative parameters of heart of palm waste produce...
Bayão,Geraldo Fábio Viana; Marcondes,Marcos Inácio; Queiroz,Augusto César de; Pimentel,Robérson Machado; Cardoso,Lucas LadeiraABSTRACT The objective of this study was to evaluate the chemical composition and the fermentative parameters of heart of palm waste produced from Alexander Palm, ensiled with chemical additives. Treatments consisted of silage of the sheath with or without calcium oxide. In the silage without calcium oxide, we evaluated the control silage (without additive) and the silage enriched with 5.0 g kg−1 urea (urea). I...
Evaluation of raw milk quality in different production systems and periods of t...
Marcondes,Marcos Inácio; Jácome,Daniele Canabrava; Silva,Alex Lopes da; Rennó,Luciana Navajas; Pires,Ana Clarissa dos SantosThe objective of this study was to evaluate the quality of raw milk in different production systems and its variation throughout the year. The data were collected from 943 dairy farms in the South, Central-West and Central regions of the state of Minas Gerais, and in Vale do Paraíba, in the state of São Paulo, Brazil. The data were collected in the period from January 2009 to September 2011, in a total of 18,20...
Energy nutritional requirements for females of Nellore, Nellore × Angus and Nel...
Souza,Evaristo Jorge Oliveira de; Valadares Filho,Sebastião de Campos; Guim,Adriana; Valadares,Rilene Ferreira Diniz; Marcondes,Marcos InácioThe 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. ...
Protein requirements for females of Nellore, Nellore × Angus and Nellore × Simm...
Souza,Evaristo Jorge Oliveira de; Valadares Filho,Sebastião de Campos; Guim,Adriana; Valadares,Rilene Ferreira Diniz; Marcondes,Marcos InácioThis study aimed to determine the protein requirements for females of Nellore, F1 Nellore × Angus and F1 Nellore × Simmental fed on two concentrate levels (30 and 50%). Sixty heifers from three genetic groups with 18 months of age were used: 20 Nellore, 20 Nellore × Angus and 20 Nellore × Simmental. Twelve heifers of the reference group (four of each genetic group) were slaughtered at the beginning of the exper...
Energy and protein nutritional requirements for Nellore bulls
Silva,Luiz Fernando Costa e; Valadares Filho,Sebastião de Campos; Zanetti,Diego; Rotta,Polyana Pizzi; Marcondes,Marcos Inácio; Prados,Laura FrancoThe objective of this study was to determine the nutritional requirements of energy and protein and estimate the efficiencies of metabolizable energy utilization for fat and protein deposition, as well as for maintenance (k m) and growth (k g). An experiment of comparative slaughter was carried out with thirty-seven 14-month-old (±1 month) Nellore bulls with 259±24.9 kg. Animals were divided as follows: five to...
Prediction of non-carcass components in cattle
Costa e Silva,Luiz Fernando; Marcondes,Marcos Inácio; Valadares Filho,Sebastião de Campos; Ribeiro,André Mauric Frossard; Prados,Laura FrancoThis study was conducted to develop equations to predict chemical composition of head, limbs, hide and blood in cattle. A database containing 335 animals from 10 trials, with 221 Nellore, 38 Nellore-Simmental and 76 Nellore-Angus (96 steers, 118 heifers and 121 bulls) animals was used. Models were constructed to estimate water, ether extract (EE), crude protein (CP), ash and macrominerals (calcium, phosphorus, ...
Exigências de proteína de animais Nelore puros e cruzados com as raças Angus e ...
Marcondes,Marcos Inácio; Valadares Filho,Sebastião de Campos; Oliveira,Ivanna Moraes de; Valadares,Rilene Ferreira Diniz; Paulino,Mário FonsecaObjetivou-se estimar as exigências de proteína de animais Nelore, Nelore-Angus e Nelore-Simental, assim como a eficiência de uso da proteína metabolizável para ganho. Foram utilizados 69 animais (23 Nelore, 23 Nelore-Angus e 23 Nelore-Simental): 12 (quatro de cada grupo genético) foram abatidos antes do início do experimento, como grupo-referência, e nove animais foram separados para um ensaio de digestibilidad...