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Search Results: 1 - 10 of 9696 matches for " egg production "
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Response of Egg Number to Selection in Rhode Island Chickens Selected for Part Period Egg Production
B.I. Nwagu,S.A.S. Olorunju,O.O. Oni,L.O. Eduvie
International Journal of Poultry Science , 2007,
Abstract: Records obtained from 4336 pullets progeny for strain A and 4843 pullets, progeny for strain B under selection for part-period egg production to 280 days of age were used for this study. The response variables measured were Age at sexual maturity (ASM), Egg number to 280 days (EGG280 D), Egg weight average (EWTAV) and Body weight at 40 weeks of age (BWT40). The genotypic response was only 0.42 eggs per generation in the male line. The female line population showed a much higher positive response to selection, the phenotypic value being 1.67 eggs per generation while the genotypic response was 3.1 eggs per generation. The genetic correlation estimates between the different economic traits ranged from -0.70± 0.38 to 0.82 ± 0.42 vs -0.71 ± 0.47 to 0.76 ± 0.29 for the male and female lines respectively. The correlation between egg number and egg weight was small non significant. ASM was highly and negatively correlated with egg production to 280 days in both lines being higher than- 0.60 in most cases. The genetic correlation between egg number and BWT40 showed no definite trend. In the female line, correlated response in age ASM and BWT40 had negative values. In the male line however except for BWT40 which showed a positive correlated response of 3.4g/year, all other traits showed negative correlated responses. Generally it was evident that selection was more effective in improving the egg number in the female line than in the male line showing an increase of 1.67 vs 0.19 eggs per year in the female and male lines, respectively. The low egg number reported was as a result of the delay in sexual maturity especially during the later years of the selection experiment. Another factor that may have contributed to the variable response achieved from generation to generation may also be due to varying season of hatching across generation. However the positive response in the female line population may be attributed to reduced age at sexual maturity.
Uso da Farinha Integral da Vagem de Algaroba (Prosopis juliflora (Sw.) D.C.) na Alimenta??o de Codornas Japonesas
Silva, José Humberto Vilar da;Oliveira, José Nilton Corrêa de;Silva, Edson Lindolfo da;Jord?o Filho, José;Ribeiro, Marcelo Luís Gomes;
Revista Brasileira de Zootecnia , 2002, DOI: 10.1590/S1516-35982002000700022
Abstract: an experiment was conducted to evaluate the inclusion levels of integral mesquite pods meal (mpm) (0, 5, 10, 15, 20 and 25%) in diet on laying quail performance. two hundred and sixteen layer quails with 160 days of age and live weight of 189 g were allotted to an experimental design completely randomized. the studied variables were obtained in three periods of 21 days. the 25% of mpm level reduced feed intake and egg mass when compared to control. except for the control, feed intake, egg production, egg mass production and egg feed mass ratio were quadratically affected. based on the results of this work, the mpm can be included up to 15% or 150 g/kg in partial corn replacement of isonitrogen and isoenergy diets, without an adverse effect on laying hens quail performance.
Desempenho produtivo de codornas alojadas em diferentes sistemas de ilumina??o artificial
Jácome,I.M.D.T.; Borille,R.; Rossi,L.A.; Rizzotto,D.W.; Becker,J.A.; Sampaio,C. de F.R.;
Archivos de Zootecnia , 2012, DOI: 10.4321/S0004-05922012000300013
Abstract: the effects of the use of led technology in lighting's program of japanese quail was evaluated, using 176 birds with 35 days of age, in a completely randomized design with four treatments (15w incandescent lamps, leds: blue, orange and white) and 2 replicates of 22 birds each. since the first week of housing we established the lighting program, starting with 13 hours of light, with increases of 30 minutes per week until it reached 17 hours of light. eggs and leftover food from each plot were weighed weekly to determine the average egg weight and feed consumption, expressed as daily basis. evaluations were performed by ethogram for 4 escotophases to assess the frequency of access to the feeders by treatment in activation of lighting technologies. there were no significant differences (p>0.05) between treatments for egg production. to the parameters of egg weight, feed intake, shell weight and shell thickness were not observed significant differences (p>0.05) between treatments. the unit haugh and specific gravity also not showed statistical differences (p>0.05) between treatments.
Desempenho Produtivo da Perdiz (Rhynchotus rufescens) Submetida a Ra??es com Diferentes Níveis Energéticos
Moro, MEG;Tavares, FA;Lima, CG;
Revista Brasileira de Ciência Avícola , 2000, DOI: 10.1590/S1516-635X2000000100002
Abstract: this experiment is aimed to define the best energy levels of ration for partridges during their reproductive phase by evaluating the feed intake, the average of eggs production and weight and feed conversion. twenty-four rhynchotus rufescens species, with 10 months of age, were fed with three isoproteic rations (15% crude protein) with different levels of metabolized energy (2,650; 2,800 and 2,950 kcal me/kg). a completely randomized experimental design with three treatments and four replicates with a couple of birds per experimental unit was used. the results show that there was no significant difference in feed intake, but there was a significant effect of energy level on the mean of eggs weight, egg production and feed conversion for 2,650 and 2,800 kcal me/kg as compared to the level of 2,950 kcal me/kg. it was concluded that energy levels from 2,650 to 2,800 kcal me/kg would be recommendable for partridge during their reproductive phase.
Níveis nutricionais de treonina digestível para poedeiras leves no segundo ciclo de produ??o
Schmidt, Marlene;Gomes, Paulo Cezar;Rostagno, Horacio Santiago;Albino, Luiz Fernando Teixeira;Nunes, Christiane Garcia Vilela;Nunes, Ricardo Vianna;
Revista Brasileira de Zootecnia , 2011, DOI: 10.1590/S1516-35982011000100021
Abstract: in order to determine nutritional requirement of digestible threonine for white-egg laying hens in the second production cycle (from 79 to 95 weeks of age), it was carried out an experiment with 180 commercial lohmann lsl laying hens, distributed in five diets (0.380; 0.413; 0.446; 0.479 and 0.512% digestible threonine), six replicates and six birds per experiment unit. levels of threonine in the ration quadratically affected feed intake, feed conversion per mass and per dozen of eggs, laying rate, weight and mass of eggs. it was not observed significant effect of the levels of threonine in the ration on weight gain, haugh unity, index of yolk and albumen and percentage of yolk and albumen, except for shell percentage, which was quadratically affected. through statistic analyzes and biological interpretation and using feed conversion per dozen of eggs as a decision parameter, the requirement of digestible threonine in the period from 79 to 95 weeks of age is 0.469%, corresponding to a threonine consumption of 459 mg/bird/day.
Exigência nutricional de lisina digestível para poedeiras semipesadas no segundo ciclo de produ??o
Schmidt, Marlene;Gomes, Paulo Cezar;Rostagno, Horacio Santiago;Albino, Luiz Fernando Teixeira;Nunes, Ricardo Vianna;Cupertino, Edwiney Sebasti?o;
Revista Brasileira de Zootecnia , 2009, DOI: 10.1590/S1516-35982009001000014
Abstract: with the objective of determining the nutritional requirement of digestible lysine for brown-egg laying hens from 79 to 95 weeks of age, an experiment was carried out using 180 commercial lohmann brown laying hens, distribuited in five treatments (0.555; 0.605; 0.655; 0.705 and 0.755%), six replications and six birds birds/replication. the feed intake and the food conversion per dozen of eggs were not influenced by the lysine levels. there was a positive linear effect on lysine intake and quadratic on feed conversion for egg mass. egg mass and weight presented a quadratic response to the lysine levels. the egg component percentage and the internal quality were not influenced by the levels of lysine, except for the yolk index, which showed quadratic effect. the digestible lysine requirement for brown-egg laying hens on the 2nd production cycle of production was 0.681% lysine, that corresponds to a daily intake of 783 mg digestible lysine.
Níveis nutricionais de metionina+cistina digestível para poedeiras leves no segundo ciclo de produ??o
Schmidt, Marlene;Gomes, Paulo Cezar;Rostagno, Horacio Santiago;Albino, Luiz Fernando Teixeira;Nunes, Ricardo Vianna;Mello, Heloisa Helena de Carvalho;
Revista Brasileira de Zootecnia , 2011, DOI: 10.1590/S1516-35982011000100020
Abstract: it was conducted an experiment with the objective of setting the nutritional requirement of methionine+cystine for white-egg laying hens in the second production cycle. it was used 180 white-egg laying hens from 79 to 95 weeks of age submitted to a basal diet deficient in methionine+cystine, supplemented with 0.00; 0.053; 0.108; 0.161 or 0.214% of dl-methionine (98%) to provide 0.490; 0.542; 0.594; 0.648 and 0.698% of digestible methionine+cystine in the rations. levels of supplementation followed ratios of methionine+cystine:lysine of 75, 83, 91, 99 and 107 with lysine fixed at 0.653%. a complete randomized design with five levels of methionine + cystine was used, with six replicates and six birds per experimental unit. levels of methionine+cystine in the ration linearly affected feed conversion per dozen of eggs and mass of eggs, laying rate, egg mass and albumen index and they quadratically affected weight of eggs and haugh unity. percentage of components of the eggs was not affected by levels of methionine+cystine in the ration. requirement of methionine+cystine for white-egg laying hens is higher than 0.698%, which corresponds to a consumption of at least 796 mg/bird/day.
Exigências nutricionais de treonina digestível para poedeiras semipesadas no segundo ciclo de produ??o
Schmidt, Marlene;Gomes, Paulo Cezar;Rostagno, Horacio Santiago;Albino, Luiz Fernando Teixeira;Nunes, Ricardo Vianna;Cupertino, Edwiney Sebasti?o;
Revista Brasileira de Zootecnia , 2010, DOI: 10.1590/S1516-35982010000500021
Abstract: the objective of this work is to determine the nutritional requirement of digestible threonine for brown-egg laying hens between 79 to 95 weeks of age. for this experiment, 180 commercial lohmann brown laying hens were used, distributed in five digestible threonine levels (0.380; 0.413; 0.446; 0.479 and 0.512%), each one with six replicates and six hens/replicate. it was observed a quadratic effect of threonine levels on the feed intake, egg mass conversions, egg dozen conversions, egg production, egg weight, and egg mass. the digestible threonine intake increased linearly in function of diet threonine levels. it was not observed effect of diet threonine levels for weight gain, yolk index, albumen index, shell percentage, yolk percentage and albumen percentage, except for the haugh units, which increased in a quadratic way according to digestible threonine levels in the feed. regarded to the food conversion per egg dozen, the requirement of digestible threonine for commercial hens in the period between 79 to 95 weeks of age is 0.467%, which corresponds to an intake of 462 mg threonine/hen/day.
Exigência de lisina para aves de reposi??o de 13 a 20 semanas de idade
Silva, José Humberto Vilar da;Albino, Luiz Fernando Teixeira;Rostagno, Horacio Santiago;Gomes, Paulo César;Euclydes, Ricardo Frederico;
Revista Brasileira de Zootecnia , 2000, DOI: 10.1590/S1516-35982000000600028
Abstract: the objective of this work was to estimate the requirement of lysine from 13 to 20 weeks and to evaluate the posterior effect on the performance of two egg-type strains. three hundred egg-white pullets from 13 to 20 weeks of age and three hundred egg-brown pullets from 13 to 20 weeks of age were allotted to a randomised block design with five treatments and four replicates. a basal diet with 14.0% of crude protein and 2900 kcal metabolizable energy/kg was supplemented with l-lysine hcl to obtain 0.39, 0.42, 0.45, 0.48, and 0.51% of total lysine in the diet. during the laying period, all hens received the same diet with 16.5 cp, 2822 kcal me/kg, 3.81% ca+2 and 0.755% of lysine. the pullets requirement estimates of lysine based on weight gain from 13 to 20 weeks were 0.48% or a daily intake of 354 mg for white-egg, and 0.49% or a daily intake of 365 mg for brown-egg. egg production and mass and egg dozen conversions of two strains were quadraticly affected. egg mass of white-egg was affected by quadratic manner. during the final growing phase, the brown-egg pullets showed better weight gain than white-egg pullets. during the egg production phase, the brown-egg pullets showed a lower feed intake and better egg mass conversion than white-egg pullets.
Exigência nutricional de lisina digestível para poedeiras leves no segundo ciclo de produ??o
Schmidt, Marlene;Gomes, Paulo Cezar;Rostagno, Horacio Santiago;Albino, Luiz Fernando Teixeira;Nunes, Ricardo Vianna;Calderano, Arele Arlindo;
Revista Brasileira de Zootecnia , 2008, DOI: 10.1590/S1516-35982008000600012
Abstract: the nutritional requirement of digestible lysine was determined in 180 lohmann lsl white-egg laying hens raised from 79 to 95 weeks of age. the birds were allotted to five levels (0.555; 0.605; 0.655; 0.705 and 0.755%) of digestible lysine, six replicates and six birds per experimental unit. quadratic effect of digestible lysine levels on feed intake, average weight gain, feed conversion/egg mass, the egg weight and the egg mass was observed. for the characteristics digestible lysine intake, feed conversion/dozen eggs and egg production a positive linear effect of digestible lysine levels was observed. the percentage of the components of the eggs and the internal quality were not affected by the digestible lysine levels, except for percentages of shell and yolk index, which showed linear negative effect. although it was observed quadratic effect on egg mass and feed conversion/egg mass, these characteristics were not used to determine digestible lysine requirements for the white-egg birds, since these traits did not meet the requirement of digestible lysine observed for the other traits. thus, the estimated requirement of digestible lysine for the white-egg laying hens, using linear effect was higher or equal to 0.755%, corresponding to an intake of at least 885 mg of digestible lysine/bird/day.
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