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Search Results: 1 - 10 of 3200 matches for " forage breeding. "
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Energy Values of Registered Corn Forage Hybrids in France over the Last 20 Years Rose in a Context of Maintained Yield Increase  [PDF]
Aurélie Baldy, Marie-Pierre Jacquemot, Yves Griveau, Cyril Bauland, Matthieu Reymond, Valérie Mechin
American Journal of Plant Sciences (AJPS) , 2017, DOI: 10.4236/ajps.2017.86099
Abstract: The cultivation of corn silage has developed in France since the 1970s to reach 1.5 million of hectares nowadays. Since 1998, a feeding value criterion (namely UFL for “Unité Fourrage Laitière”) has been taken into account to register forage varieties in the French forage maize hybrids catalog in addition to other criteria related to plant agronomical performances such as yield, earliness and lodging resistance. It is frequently stated that the improvement of plant’s agronomic performances would led to a decline in forage energy value. Decline of “Unité Fourrage Laitière” values has been repeatedly reported and the expected increase was not yet visible in 2002. In the present study, a set 47 early and mid-early hybrids commercialized in France between 1958 and 2015 has been cultivated in 3 locations in France. “Unité Fourrage Laitière” values and yield have been estimated in order to shed light on the evolution of feeding value criteria during this period and to conclude on the evolution of “Unité Fourrage Laitière” values since the introduction of this criterion for registration. Results obtained in our study demonstrated a recent rise in “Unité Fourrage Laitière” value in a context of strong yield increase. This increase was not necessarily attributable to high cob proportion in the harvested silage. Breeder’s work since the 2000’s has succeeded to offer hybrids that recover “Unité Fourrage Laitière” values similar to the ones of hybrids from the 1960’s (Royal, 1960, 91 UFL/100
Avalia??o de cultivares de alfafa e estimativas de repetibilidade de caracteres forrageiros
Ferreira, Reinaldo de Paula;Botrel, Milton de Andrade;Pereira, Antonio Vander;Cruz, Cosme Dami?o;
Pesquisa Agropecuária Brasileira , 1999, DOI: 10.1590/S0100-204X1999000600010
Abstract: the objective of this study was to evaluate the performance of 42 cultivars of alfalfa (medicago sativa l.) and to estimate the repeatability coefficient for dry matter production, leaf and stem protein content and disease tolerance features during the dry (april to september) and rainy (october to march) seasons with six cuts. dry matter yield and leaf protein content presented significant variation in both seasons, although stem protein content and tolerance to diseases were different only during the dry season. cultivars crioula and cibola had the best performance in most features. in general, the repeatability coefficient showed a low magnitude estimate (below 0,40). regarding dry matter production, the cultivars showed similar behavior in both seasons, with repeatability coefficient ranging from 0.3195 to 0.4270, genotypic determination around 65% and the possibility to predict the real value after seven to nine cuts.
Comportamento agron?mico de popula??es de azevém anual (Lolium multiflorum L.) para cultivo invernal na regi?o sudeste
Pereira, Antonio Vander;Mittelmann, Andréa;Ledo, Francisco José da Silva;Souza Sobrinho, Fausto de;Auad, Alexander Machado;Oliveira, Jackson Silva e;
Ciência e Agrotecnologia , 2008, DOI: 10.1590/S1413-70542008000200034
Abstract: in the southeast region of brazil, the winter season is characterized by poor quality and low availability of the pastures. in that region the annual ryegrass is one of the most recommended winter forage to be used for dairy cattle diets. the objective of this study was to evaluate the behavior of ryegrass populations under the mata atlantica environment. from the 30 evaluated populations, 22 were collected and eight belong to embrapa's collection. a randomized blocks design with three replications was used, and seven cuts were done. plant height, percent and dry matter production, regrowth, days to flowering and seed production were recorded. for all these parameters there were differences between populations. total dry matter production varied from 3654 kg/ha (le 284) to 8544 kg/ha (cnpgl 164 population). the results showed that collected ryegrass populations have high potential for forage production and some of them can be recommended for southeast region during the winter season.
Avalia??o de cultivares de alfafa na Zona da Mata de Minas Gerais
Lédo, Francisco José da Silva;Pereira, Ant?nio Vander;Botrel, Milton de Andrade;Souza Sobrinho, Fausto de;Oliveira, Jackson Silva e;Xavier, Deise Ferreira;Heinemann, Alexandre Bryan;Ferreira, Reinaldo de Paula;
Ciência e Agrotecnologia , 2004, DOI: 10.1590/S1413-70542004000500025
Abstract: the objective of this experiment was to evaluate and select the alfalfa cultivars (medicago sativa l.) best adapted to the climate and soil of zona da mata, in minas gerais, brazil. the trial was carried out at embrapa gado de leite, in the experiment station located in coronel pacheco, mg, using a randomized complete block design with two replications. fifty-nine cultivars studied between sept. 9, 1999 and dec. 10, 2001 were submitted to 16 evaluating cuts. dry matter production (dmp), plant height (ph), vigor (vg), flowering percent (flo), leaf/stem ratio (rfc) and disease (d) and pests (p) occurrence were observed. there were significant differences among cultivars regarding to dmp, ph, vg, flo and d. cultivars p-30, crioula c-3 and crioula c-2 showed the highest dmp (13,17; 13,13; 13,00 e 12,48 t/ha/year, respectively). taller flo (18,98%) and ph (54,13 cm) were observed during the cuts done during the summer compared to those done during the winter (6,11% and 46,60 cm, respectively). based on the results of the trial, the cultivars p-30, crioula c-1, crioula c-3 and crioula c-2 were selected.
Avalia??o agron?mica de linhagens de aveia-branca em duas regi?es fisiográficas do Rio Grande do Sul
Tafernaberri Júnior, Vilmar;Dall'Agnol, Miguel;Montardo, Daniel Portella;Pereira, Emerson André;Peres, éder Rodrigues;Le?o, Marcos Laux;
Revista Brasileira de Zootecnia , 2012, DOI: 10.1590/S1516-35982012000100007
Abstract: the objective of this study was to proceed with an initial evaluation of various strains of white oats (avena sativa, l.), with the objective of characterizing the genetic diversity and the agronomic performance, identifying the promising genotypes for the release of cultivars, with the purpose of forage production. the experiments were conducted in two geographical regions of the state of rio grande do sul, depress?o central and in the campanha gaúcha, brazil, in the years 2008 and 2009, in a randomized block design with four replications. each plot consisted of a 2-m line, with lines spaced at 40 cm. the central linear meter was considered as useful plot, cut to a height of 10 cm. twenty-one oat lines were evaluated, plus the control (ipr126). in the first year, two strains of triticale were also studied, and had a low potential for forage and were excluded from the experiments in the second year. the productive potential of oat strains did not differ for the interaction of location, year or lineage, with the first year of average production in the depress?o central and campanha gaúcha, of, 82 3 and 76.3 grams per meter of total dry matter (tdm), respectively. at the second year evaluation, the means of production for this species in the depress?o central and campanha gaúcha were 80.0 and 119.8 g m-1 tdm. most strains of oats present good results and are promising for the breeding program of this species.
Associa??o entre caracteres e análise de trilha na sele??o de progênies de meios-irm?os de Brachiaria ruziziensis
Borges, Vanderley;Sobrinho, Fausto Souza;Lédo, Francisco José da Silva;Kopp, Maurício Marini;
Revista Ceres , 2011, DOI: 10.1590/S0034-737X2011000600013
Abstract: high association between fresh and dry mass weight can facilitate early selection of superior genotypes of b. ruziziensis r. germ. & c.m. evrard. the aim of this study was to verify the associations between traits in the selection of b. ruziziensis genotypes. the experiment was arranged in a complete randomized block design with two replications. the traits evaluated were height and vigor of plants; weight of fresh mass and percentage of dry matter of the whole plant, stem and leaf; dry mass weight of total herbage, stem, and leaf and the ratio between productivity of leaf and stem. estimation of simple correlations and path analysis were performed considering the dry mass weight as the main variable. the correlations were mostly low, but significant higher correlations were observed between fresh mass weight and dry mass weight, dry weight of the stem and dry weight of leaves. the path coefficients showed that the direct effects of different explanatory variables on the dry mass weight were mostly low. more significant direct effects were obtained with fresh mass weight, stem dry weight and leaf dry weight, indicating that the fresh mass weight allows for the indirect selection for dry mass weight.
Repetibilidade de características agron?micas e número de cortes necessários para sele??o de Urochloa ruziziensis
Souza Sobrinho, Fausto;Borges, Vanderley;Lédo, Francisco José da Silva;Kopp, Maurício Marini;
Pesquisa Agropecuária Brasileira , 2010, DOI: 10.1590/S0100-204X2010000600007
Abstract: the objective of this work was to estimate the repeatability of agronomic traits and to determine the appropriate number of cuts for selectig urochloa ruziziensis. one hundred and eighteen progenies of half-sib u. ruziziensis and four checks, the cultivars basilisk (u. decumbens), marandu (u. brizantha), comum (u. ruziziensis) and one access urochloa sp. were evaluated. a randomized complete block with two replications and plots in a 3.0-m line with 1.0x0.5-m spacing was used. seven cuts were made at intervals of 60 and 90 days in wet and dry seasons, respectively. the evaluated characteristics were: plant height, dry matter weight (dm), fresh matter weight (fm) and percentage of dry matter (pdm). the repeatability was estimated by analysis of variance, principal components of the covariance matrix and of the correlation matrix, and structural analysis using the correlation matrix. repeatability estimates varied from 0.31-0.38 for plant height, 0.31-0.43 for fm, 0.16-0.50 for pdm and 0.23-0.43 for dm, with coefficients of determination between 57-87%. the number of cuts necessary to assess the actual value of the characteristics ranged between 7-8 cuts for fm and plant height, and 10-14 for dm and pdm, with coefficients of determination greater than 80%.
Identificación morfológica y molecular de Prosapia simulans (Walker) (Hemiptera: Cercopidae), y selección y mecanismos de resistencia a este salivazo en híbridos de Brachiaria
Castro, Ulises;Cardona, Cesar;Vera-Graziano, Jorge;Miles, John;Garza-Garcia, Ramón;
Neotropical Entomology , 2007, DOI: 10.1590/S1519-566X2007000400012
Abstract: prosapia simulans (walker) is an important spittlebug species that attacks forage grasses of the genus brachiaria (trin.) griseb. from mexico to colombia. this, and several other species of spittlebugs, cause important economic losses to the livestock production industry. development of resistant cultivars is regarded as the best method of control. in the present study we used taxonomic keys, dissection of male genitalia and rapd-pcr patterns to reconfirm the identity of p. simulans specimens collected in colombia and mexico. we were able to reconfirm that p. simulans occurs as a pest of brachiaria from mexico to colombia. we also studied the levels and mechanisms of resistance present in 34 brachiaria hybrids developed by ciat. infestations were made with six eggs per plant. we used 10 replications (plants) per genotype in a completely randomized design. seven hybrids were found to be susceptible, 16 showed intermediate resistance and 11 were resistant. antibiosis was the mechanism of resistance expressed in resistant hybrids as well as in the resistant checks ciat 6294 and ciat 36062. tolerance was absent. the genotypes brx 4402 and ciat 0606 were classified as highly susceptible.
In situ dry matter and fiber fraction degradability of the Mineir?o stylos
Corrêa, Daniel Staciarini;Magalh?es, Roberto Toledo de;Siqueira, Domingas Cruvinel Batista de;
Acta Scientiarum. Animal Sciences , 2012, DOI: 10.4025/actascianimsci.v34i2.13138
Abstract: this research evaluated, using the in situ technique, the dry matter and fiber fraction degradability of the mineir?o stylo (stylozanthes guianensis). the nylon bag method was used for the degradability assay, with two incubations in rumen-cannulated adult female cows. in each incubation, 25 samples of 7.0 g each were used. the samples were collected at 0, 6, 9, 12, 24, 36, 48, 72 and 96 hours. the experiment was conducted according to a randomized blocks design and data were submitted to analysis of variance. the maximum effective degradability was obtained in the 2% passage rate. for the 5% passage rate the mineir?o stylo showed effective degradation of 75.70% for dry matter, 59.01% for neutral detergent fiber and 76.81% for acid detergent fiber. the digestibility achieved by the dry matter and fibrous fraction from mineir?o was considered high. these results, coupled with the low lag time found reveal the forage potential of the cultivar.
Validación de un método de selección para rendimiento en alfalfa basado en la depresión por endocría
Arolfo,V.; Odorizzi,A.; Basigalup,D.; Balzarini,M.;
Agriscientia , 2011,
Abstract: rapid inbreeding depression in alfalfa is due to loss of intraallelic interactions in tri- and tetraallelic plants. these plants could be identified by using a s1 progeny test and then combined into a higher yielding synthetic variety. the objective of this study was to evaluate the usefulness of s1 progeny test to identify tri and tetraallelic genotypes. three alfalfa synthetic experimental populations (pse) were developed by applying three selection methods to an original plant population (po). the first one, selected those plants whose s1 progenies exhibited higher inbreeding depression (≥65%) on forage production; the second one, selected the plants of the po that did not produce s1 seed; the last one, consisted on traditional phenotypic selection of po plants with higher forage yield (15% superior). the elite were manually intercrossed and harvested to produce pse 1, 2 and 3, respectively. accumulated forage yield was analyzed for each pse and po during the season. all the pse produced more (p<0.05) than the po; however, pse 1 was no different from pse 3. data were also used to estimate variance components. the heritability (h) reached a value of 0.86.
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