Search Results - "Blake, R.W"

Swimming in four goldfish Carassius auratus morphotypes: understanding functional design and performance employing artificially selected forms by Blake, R.W., Li, J., Chan, K.H.S.

“…Four goldfish Carassius auratus morphotypes of similar length (50 mm): common (streamlined, full complement of paired and median fins, bifurcated caudal fin),…”
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A multilevel model with clustered management practices differentiating dairy herd environments in southeastern Sicily by Raffrenato, E., Blake, R.W., Oltenacu, P.A., Gambina, M., Licitra, G.

“…Herd environments constitute productivity potentials, or aggregate opportunity outcomes, resulting from management actions taken with the available inputs…”
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Short communication: Changes in the association between milk yield and age at first calving in holstein cows with herd environment level for milk yield by Ruiz-Sánchez, R, Blake, R W, Castro-Gámez, H M A, Sánchez, F, Montaldo, H H, Castillo-Juárez, H

“…The aim of this study was to evaluate the effect of herd environment class on the genetic and phenotypic relationships of mature equivalent milk yield (MY) on…”
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Fertility responses of Mexican Holstein cows to US sire selection by Cienfuegos-Rivas, E G, Blake, R W, Oltenacu, P A, Castillo-Juarez, H

“…Genetic relationships between 2 fertility traits and milk production were investigated using mature-equivalent lactation records of 55,162 daughters of 1,339…”
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Interaction between milk yield of Holstein cows in Mexico and the United States by Cienfuegos-Rivas, E G, Oltenacu, P A, Blake, R W, Schwager, S J, Castillo-Juarez, H, Ruiz, F J

“…Genotype by environment interaction for milk yield was investigated by analyzing 55,162 mature equivalent, first lactation records of daughters from 1339…”
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Prediction of daily and lactation yields of milk, fat, and protein using an autoregressive repeatability test day model by Vasconcelos, J, Martins, A, Petim-Batista, M F, Colaço, J, Blake, R W, Carvalheira, J

“…We evaluated the accuracy of an autoregressive multiple-lactation test day (ATD) model to predict missing test day yields of milk, fat, and protein to obtain…”
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Genetic analysis of Holstein cattle populations in Brazil and the United States by Costa, C N, Blake, R W, Pollak, E J, Oltenacu, P A, Quaas, R L, Searle, S R

“…Genetic relationships between Brazilian and US Holstein cattle populations were studied using first-lactation records of 305-d mature equivalent (ME) yields of…”
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Evaluation of tropical grasses for milk production by dual-purpose cows in tropical Mexico by Juarez Lagunes, F I, Fox, D G, Blake, R W, Pell, A N

“…Two experiments using the Cornell Net Carbohydrate and Protein System were conducted to characterize the carbohydrate and protein fractions and corresponding…”
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Application of an autoregressive process to estimate genetic parameters and breeding values for daily milk yield in a tropical herd of Lucerna cattle and in United States Holstein herds by Carvalheira, J G, Blake, R W, Pollak, E J, Quaas, R L, Duran-Castro, C V

“…The objectives of this study were to estimate from test day records the genetic and environmental (co)variance components, correlations, and breeding values to…”
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Nutrient status of cattle grazing systems in the western brazilian amazon by Rueda, B. L., McRoberts, K. C., Blake, R. W., Nicholson, C. F., Valentim, J. F., Fernandes, E. C. M.

“…Low-input cultivated pastures to feed cattle have dominated land use after forest clearing for decades in the western Brazilian Amazon. This study was…”
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Use of grade animals in dairy cattle improvement: introduction by Blake, R W

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Effect of herd environment on the genetic and phenotypic relationships among milk yield, conception rate, and somatic cell score in Holstein cattle by Castillo-Juarez, H, Oltenacu, P A, Blake, R W, Mcculloch, C E, Cienfuegos-Rivas, E G

“…A total of 248,230 primiparous records of Holstein cows calving from 1987 to 1994 (daughters of 588 sires in 3042 herds) was used to evaluate potential…”
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Genotype by environment interaction for yield and somatic cell score with alternative environmental definitions by Raffrenato, E, Blake, R W, Oltenacu, P A, Carvalheira, J, Licitra, G

“…Differential genetic expression in high and low opportunity Sicilian Holstein-Friesian and Brown Swiss herd environments was investigated using endogenous and…”
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Production and economic potentials of cattle in pasture-based systems of the western Amazon region of Brazil by Rueda, B.L, Blake, R.W, Nicholson, C.F, Fox, D.G, Tedeschi, L.O, Pell, A.N, Fernandes, E.C.M, Valentim, J.F, Carneiro, J.C

“…Our objectives were to evaluate strategies to improve productivity and economic returns from beef and dual-purpose cattle systems based on data collected on…”
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Genetic methods of improving dairy cattle for the south: a review and prospects from Regional Project S-49 by Blake, R W, McDaniel, B T, Pearson, R E, McDowell, R E, Wilcox, C J

“…Objectives of Southern Regional Research Project S-49, comprising eight contributing experiment stations, are to determine direct response to selection in milk…”
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An autoregressive repeatability animal model for test-day records in multiple lactations by Carvalheira, J, Pollak, E J, Quaas, R L, Blake, R W

“…Test-day (TD) models are becoming a standard for genetic evaluation of production traits in dairy cattle. Various approaches to model covariances between TD…”
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Predicting nutritional requirements and lactation performance of dual-purpose cows using a dynamic model by Reynoso-Campos, O., Fox, D.G., Blake, R.W., Barry, M.C., Tedeschi, L.O., Nicholson, C.F., Kaiser, H.M., Oltenacu, P.A.

“…A dynamic application of the Cornell Net Carbohydrate and Protein System (CNCPS) model was developed to predict annual cycles in animal nutrient requirements…”
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Assessment of the dairy production needs of cattle owners in southeastern Sicily by Licitra, G, Blake, R W, Oltenacu, P A, Barresi, S, Scuderi, S, Van Soest, P J

“…This study was undertaken to investigate research and outreach priorities for Progetto Ibleo (Project Ibleo), a center created in 1990 with tripartite…”
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Genotype by environment interaction for Holstein milk yield in Colombia, Mexico, and Puerto Rico by Stanton, T L, Blake, R W, Quaas, R L, Van Vleck, L D, Carabaño, M J

“…Components of (co)variance and genetic parameters were estimated by REML procedures from first lactation mature equivalent Holstein milk records from 54,604…”
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Comparison of Landim and Africander cattle in southern Mozambique. II. Female fertility, reproduction, and beef offtake by Carvalheira, J. G, Blake, R. W, Pollak, E. J, Van Soest, P. J

“…Fertility and reproductive performance of Landim and Africander females were compared using data collected from 1968 to 1981 at the Chobela Research Station in…”
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