14 documents found, page 1 of 2
Developing a continuous adjustment factor for dry matter intake of gestating an...
Gallo,Sarita Bonagurio; Tedeschi,Luis OrlindoABSTRACT: Intake is a multifactorial process that is influenced by animal type, environmental factors, and diet characteristics. Sheep, especially, have specific eating habits, with a greater selection of ingested feed compared to cattle. Thus, predictive equations for dry matter intake (DMI) must constantly be reviewed. The objective of this study was to combine different adjustment factors to develop one cont...
The geometry of the lactation curve based on Wood's equation: a two-step predic...
Oliveira,Jhone Gleison de; Sant'Anna,Daniel Furtado Dardengo; Lourenço,Matheus Celestiano; Tavares,Davi Simões Tavares; Rodrigues,Marcelo TeixeiraABSTRACT Lactation records from cows of the southwestern Paraná state, Brazil, form the dataset of this study. We applied the information-theoretic approach to evaluate the ability of the nonlinear Wood, Brody, Dijkstra, and Gamma functions to fit to these data by employing a two-step technique based on nonlinear mixed-effects models and generalized linear mixed-effects models. Wood's equation was fitted with t...
Exogenous enzyme on in vitro gas production and ruminal fermentation of diet co...
Freiria,Lucien Bissi da; Zervoudakis,Joanis Tilemahos; Paula,Nelcino Francisco de; Cabral,Luciano da Sival; Tedeschi,Luis OrlindoSUMMARY Exogenous enzyme preparations (fibrolytic activity (FIB), 0, 0.6, 1.2, 1.8, and 2.4 mg/ml liquid volume incubated; amylolytic activity (AMZ), 0, 0.05, 0.10, 0.15, and 0.20 mg/ml liquid volume incubated; proteolytic activity (PRO), 0, 0.05, 0.10, 0.15, and 0.20 mg/ml liquid volume incubated) were incubated in vitro. Their fermentation effects were assessed based on accumulated gas production, kinetic par...
A glimpse of the future in animal nutrition science. 1. Past and future challenges
Tedeschi,Luis Orlindo; Almeida,Amélia Katiane de; Atzori,Alberto Stanislao; Muir,James Pierre; Fonseca,Mozart Alves; Cannas,AntonelloABSTRACT If the world population continues to increase exponentially, wealth and education inequalities might become more pronounced in the developing world. Thus, offering affordable, high-quality protein food to people will become more important and daunting than ever. Past and future challenges will increasingly demand quicker and more innovative and efficient solutions. Animal scientists around the globe cu...
A glimpse of the future in animal nutrition science. 2. Current and future solu...
Tedeschi,Luis Orlindo; Fonseca,Mozart Alves; Muir,James Pierre; Poppi,Dennis P.; Carstens,Gordon E.; Angerer,Jay P.; Fox,Danny GeneABSTRACT Despite tremendous advancements in the livestock sector, additional opportunities exist to improve even further livestock production around the globe. Forecasting is not an exact science and it relies heavily on past and current knowledge. Improvements in the nutritional sciences (both human and animal) include a better understanding of agents that cause deterioration of human health, improving the qua...
Models of protein and amino acid requirements for cattle
Tedeschi,Luis Orlindo; Fox,Danny Gene; Fonseca,Mozart Alves; Cavalcanti,Luigi Francis LimaProtein supply and requirements by ruminants have been studied for more than a century. These studies led to the accumulation of lots of scientific information about digestion and metabolism of protein by ruminants as well as the characterization of the dietary protein in order to maximize animal performance. During the 1980s and 1990s, when computers became more accessible and powerful, scientists began to con...
Evaluation of mathematical models to describe growth of grazing young bulls
Fernandes,Henrique Jorge; Tedeschi,Luis Orlindo; Paulino,Mário Fonseca; Detmann,Edenio; Paiva,Luisa Melville; Valadares Filho,Sebastião de CamposThe objective of this study was to evaluate the use of different mathematical models to describe growth of grazing beef cattle. Data of 20 Nellore bulls with initial weight of 129±28.1 kg and final weight of 405±62.0 kg were used. The animals were randomly divided into four plots and placed on B. decumbens Stapf pastures. Three plots received concentrate supplement with different protein profiles and the fourth...
Evaluation of the Cornell Net Carbohydrate and Protein System model on the pred...
Morenz,Mirton José Frota; Silva,José Fernando Coelho da; Aroeira,Luiz Januário Magalhães; Deresz,Fermino; Vásquez,Hernán MaldonadoThe Cornel Net Carbohydrate and Protein System model version 5.0 was assessed as for its prediction of dry matter intake and milk production of grazing lactating Holstein × Zebu cows. Eight lactating cows grazing elephant grass (Pennisetum purpureum, Schum., cv. Napier) were used in two experiments of 30 days each. The experimental design was of randomized blocks (subplots). Dry matter intake was estimated usin...
Níveis de inclusão e tempo de exposição da cana-de-açúcar ao óxido de cálcio so...
Pina,Douglas dos Santos; Valadares Filho,Sebastião de Campos; Tedeschi,Luis Orlindo; Barbosa,Analívia Martins; Azevêdo,José Augusto GomesAvaliou-se nesta pesquisa o efeito da inclusão de óxido de cálcio (cal) e dos tempos de exposição da cana-de-açúcar à cal sobre o desempenho de novilhas Nelore, a digestibilidade dos componentes da dieta e a síntese de proteína microbiana ruminal (PBMic) e comparou-se o dióxido de titânio ao óxido crômico para estimar o consumo individual de concentrado. Utilizaram-se 30 fêmeas Nelore com aproximadamente 24 mes...
Comparing plastic syringes and disposable columns to extract n-alkanes in forag...
Oliveira,Dimas Estrasulas de; Tedeschi,Luis OrlindoSaturated aliphatic hydrocarbons (n-alkanes) were extracted from feed, orts, and bovine fecal samples using disposable, plastic 5mL-syringes as an alternative material to disposable columns, which are normally used in the liquid-solid extraction phase of n-alkanes. For both methods, the n-alkane extracts (carbon chain length between 31 and 36 atoms) were identified using gas chromatography. The linear regressio...