7 documents found, page 1 of 1
Random regression models using Legendre orthogonal polynomials to evaluate the ...
Silva, F.G.; Torres, R.A.; Brito, L.F.; Euclydes, R.F.; Melo, A.L.P.; Souza, N.O.; Ribeiro Jr., J.I.; Rodrigues, M.T.The objective of this study was to identify the best random regression model using Legendre orthogonal polynomials to evaluate Alpine goats genetically and to estimate the parameters for test day milk yield. On the test day, we analyzed 20,710 records of milk yield of 667 goats from the Goat Sector of the Universidade Federal de Viçosa. The evaluated models had combinations of distinct fitting orders for polyno...
Genetic and environmental factors that influence production and quality of milk...
Brito, L.F.; Silva, F.G.; Melo, A.L.P.; Caetano, G.C.; Torres, R.A.; Rodrigues, M.T.; Menezes, G.R.O.Data from 1279 lactations of 783 Alpine and Saanen goats of the herd of our university in Minas Gerais, Brazil, were used to study environmental effects on and to estimate genetic parameters for milk production until 270 days of lactation (MP270) and for production and percentages of fat (PFAT and %FAT), protein (PPROT and %PROT), lactose (PLACT and %LACT), and total dry extract (PEXTR and %EXTR). Environmental...
Factors that influence the test day milk yield and composition
Silva, F.G.; Brito, L.F.; Torres, R.A.; Ribeiro Júnior, J.I.; Oliveira, H.R.; Caetano, G.C.; Rodrigues, M.T.The objective of this research was to study the factors that influence the test day milk yield (TDMY) and percentages of protein, fat, lactose, and total dry extract obtained on test day. We evaluated 110,732 weekly milk production records from 1496 goats and 19,271 monthly milk constituent records from 1245 Alpine and Saanen goats, which were collected from 1997 to 2010 in the goat sector at Universidade Feder...
Genetic evaluation of milk yield in Alpine goats for the first four lactations ...
Torres, R.A.; Carneiro, A.P.S.; Nascimento, M.; Silva, F.F.; Silva, L.P.; Rodrigues, M.T.; Ventura, H.T.; Silva, F.G.Random regression models have been used in evaluating test-day milk yield, providing accurate estimates of genetic values in animals. However, herd evaluation with only information from the first lactation may not be the best option from an economic perspective. Other factors should be taken into account, particularly other lactations. Our objective in this study was to analyze the genetic divergence between th...
Genetic evaluation of Alpine goats using different milk control intervals
Silva, F.G.; Torres, R.A.; Brito, L.F.; Silva, L.P.; Menezes, G.R.O.; Brito, L.C.; Euclydes, R.F.; Rodrigues, M.T.The objective of this study was to compare the results of genetic evaluations by using different milk control intervals to reduce the cost of milk yield controls without harming the quality of genetic evaluation of the animals. We analyzed test day milk yield data from the Goat Sector of Universidade Federal de Viçosa. After editing and checking for errors in the database, there were 20,710 records of test day ...
A case study undertaken recycling & reuse of glass fiber reinforced thermoset p...
Ribeiro, M.C.; Fiúza, António; Meira Castro, Ana C.; Silva, F.G.; Meixedo, JP; Dinis, M.L.Glass fibre-reinforced plastics (GFRP) have been considered inherently difficult to recycle due to both: crosslinked nature of thermoset resins, which cannot be remoulded, and complex composition of the composite itself. Presently, most of the GFRP waste is landfilled leading to negative environmental impacts and supplementary added costs. With an increasing awareness of environmental matters and the subsequent...
Necessidades de água e produtividade económica da rega de milho em condições de...
Rodrigues, G.C.; Paredes, Paula; Rosa, R.D.; Silva, F.G.; Pereira, L.S.A identificação das necessidades de rega do milho, uma das principais culturas regadas em Portugal Continental, constitui uma medida de preparação para enfrentar as secas e a escassez de água. Definiram-se várias estratégias de rega com o objectivo de redução da procura de água de rega com impactos aceitáveis na produção. O modelo de balanço hídrico e de simulação de calendários de rega SIMDualKc, anteriormente...