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Search Results: 1 - 10 of 13002 matches for " Ribeiro AML "
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Methionine sources do not affect performance and carcass yield of broilers fed vegetable diets and aubmitted to cyclic heat stress
Ribeiro, AML;Dahlke, F;Kessler, AM;
Revista Brasileira de Ciência Avícola , 2005, DOI: 10.1590/S1516-635X2005000300004
Abstract: the supplementation of vegetal diets with l-methionine (100% molar), methionine hydroxyl analogue (hmb) (88% molar) or dl-methionine (99% molar) was compared as to the performance of broilers allocated in cages and submitted to cyclic heat stress (chs). the trial was carried out from 21 to 42 days of age. two levels of synthetic methionine were supplemented for each methionine source (0.1 or 0.3 %), and the control treatment was not supplemented with synthetic methionine (negative control). statistical analyses included the negative control treatment or were performed in a 3 x 2 factorial design (sources x levels). addition of synthetic methionine to the basal level containing 0.63 % of total sulphur amino acids significantly improved feed conversion (fc) independent of the source. on the other hand, improvements in weight gain (wg) and body weight (bw) were more consistent comparing the negative control to hmb-supplemented treatments. factorial analysis showed better fc for l-met compared to dl-met, whereas hmb showed intermediate results. the supplementation level of 0.3% methionine showed better fc than 0.1%. methionine levels or sources had no effects on carcass, yields of cuts or feathering results. therefore, results of dl-met and hmb added to vegetal-based diets in comparable molar terms promoted similar performance in broilers under chs conditions.
Granulometria do Milho em Ra??es de Crescimento de Frangos de Corte e seu Efeito no Desempenho e Metabolismo
Ribeiro, AML;Magro, N;Penz Jr, AM;
Revista Brasileira de Ciência Avícola , 2002, DOI: 10.1590/S1516-635X2002000100006
Abstract: two experiments were carried out to evaluate corn particle size, expressed by the average geometric diameter (agd), .0.337; 0.574; 0.680; 0.778; 0.868 e 0.936mm on performance, energetic metabolism and intestinal morphology (villi height and crypts depth of duodenum) of 21 to 42 day-old male broilers. in the first experiment, particle size of 0.868 mm showed greater feed intake and weight gain and better feed conversion. villi height was not affected by the agd of the diets, but increased with the broilers age (21, 35 and 42 days of age). abdominal fat deposition was not affected neither the proportion of carcass cuts. gizzard weight was positively related with particle size. in the second experiment, feed with particle size of 0.337 mm led to a lower energy intake and greater gross energy excretion. nitrogen retention was not affected by particle size.
Compensatory water consumption of broilers submitted to water restriction from 1 to 21 days of age
Viola, TH;Ribeiro, AML;Penz Jr., AM;
Revista Brasileira de Ciência Avícola , 2005, DOI: 10.1590/S1516-635X2005000400008
Abstract: a hundred and fifty male ross 308 broilers were submitted to water restriction (wr) in different levels (0 to 40%) until 21 days of age. the birds received water ad libitum from 22 to 28 days of age and the compensatory consumption of water (cconw) was calculated as the difference in water intake between birds submitted and not submitted to wr. all wr groups showed a compensatory consumption of water, mainly during the first days of the ad libitum period. the water intake in such groups decreased as the birds adapted to the new condition. higher water intake was observed in birds with 30 and 40% wr than in birds with 10% wr. furthermore, chickens showed an unusual drinking and feeding behavior during the restriction period.
Granulometria do Milho em Ra es de Crescimento de Frangos de Corte e seu Efeito no Desempenho e Metabolismo
Ribeiro AML,Magro N,Penz Jr AM
Revista Brasileira de Ciência Avícola , 2002,
Abstract: Foram realizados dois experimentos para avaliar os efeitos da granulometria do milho das ra es, expressa pelo diametro geométrico médio (DGM), 0,337; 0,574; 0,680; 0,778; 0,868 e 0,936mm, sobre o desempenho, o metabolismo energético e a morfologia intestinal (número e altura de vilosidades do duodeno) de frangos de corte machos, de 21 aos 42 dias de idade. No 1° experimento, partículas de 0,868 mm proporcionaram às aves maior consumo de ra o, maior ganho de peso e melhor convers o alimentar. A altura das vilosidades intestinais n o foi influenciada pelo DGM das dietas, mas aumentou com a idade das aves (21, 35 e 42 dias de idade). N o foi observado efeito da granulometria sobre a deposi o de gordura abdominal ou sobre as propor es das partes da carca a. O peso da moela esteve positivamente relacionado com o aumento da granulometria das dietas. No 2° experimento, as aves alimentadas com milho de 0,337 mm apresentaram menor consumo de energia metabolizável e maior excre o de energia bruta. A granulometria n o influenciou na reten o de nitrogênio.
Tamanho da Partícula do Milho e Forma Física da Ra??o e Seus Efeitos Sobre o Desempenho e Rendimento de Carca?a de Frangos de Corte
Dahlke, F;Ribeiro, AML;Kessler, AM;Lima, AR;
Revista Brasileira de Ciência Avícola , 2001, DOI: 10.1590/S1516-635X2001000300006
Abstract: the experiment was conducted to evaluate the effect of different corn particle size, expressed as geometric mean diameter (gmd)(0.336 mm, 0.585mm, 0.856 mm and 1.12 mm) and two diet forms (mash-m and pellets-p) on performance and carcass yield of broilers from 21 to 42 days of age. m diets, produced with 0.336 mm of gmd resulted in lower feed intake (fi) (p<0.001), lower weight gain (wg) (p<0.001) and worse feed efficiency (fe) (p<0.001) than 0.336 mm p diets. m and p diets with other gmd did not show differences in performance. when particle size was evaluated itself, increments in gmd resulted a linear increase on wg and a quadratic increase on fi and fe. neither form of diet nor particle size influenced carcass and leg+drumstick yields, although breast yield decreased with m diet,0.336 mm gmd (p<0.001).
Nutrient balance of layers fed diets with different calcium levels and the inclusion of phytase and/or sodium butyrate
Vieira, MM;Kessler, AM;Ribeiro, AML;Silva, ICM;Kunrath, MA;
Revista Brasileira de Ciência Avícola , 2011, DOI: 10.1590/S1516-635X2011000200011
Abstract: in this study, hisex brown layers in lay were evaluated between 40 and 44 weeks of age to evaluate the inclusion of bacterial phytase (ph) and sodium butyrate (sb) to diets containing different calcium levels (cal). performance, average egg weight and eggshell percentage, in addition to nutrient metabolizability and ca and p balance were evaluated for 28 days. birds were distributed according to a completely randomized experimental design with a 3x2x2 factorial arrangement, with three calcium levels (2.8, 3.3, 3.8%); the addition or not of phytase (500phu/kg) and the addition or not of sodium butyrate (20meq/kg), composing 12 treatments with eight replicates of one bird each. there was no additive effect of phytase or sb on the evaluated responses. feed intake and feed conversion ratio were influenced by cal, with the best performance obtained with 3.3% dietary ca. ca balance was positively affected by dietary ca, and p balance by the addition of phytase. ca dietary concentration, estimated to obtain ca body balance, was 3.41%, corresponding to an apparent retention of 59.9% of ca intake.
Avalia??o das Propriedades do ácido Nicotínico no Desempenho e no Balan?o Térmico de Frangos de Corte Durante Estresse por Calor
Ribeiro, AML;Mahmoud, H;Teeter, RG;Penz Jr, AM;
Revista Brasileira de Ciência Avícola , 2001, DOI: 10.1590/S1516-635X2001000100004
Abstract: four doses of nicotinic acid, added in the drinking water of broilers, were offered in order to study its effect on performance and heat production in heat stress conditions (6 h of 35° c). doses were 15, 100, 330 and 1000 mg/l. there was no effect of dose on weight gain, feed intake, feed efficiency, water intake and rectal temperature. slight changes due to the doses of nicotinic acid and heat stress in the blood parameters of the birds were noted. heat production (kcal/h/metabolic weight) decreased in 100 and 1000 mg/l dose as compared to 15 mg/l dose. there was no benefit using nicotinic acid in those doses in heat stress alleviation.
Effects of corn particle size and physical form of the diet on the gastrointestinal structures of broiler chickens
Dahlke, F;Ribeiro, AML;Kessler, AM;Lima, AR;Maiorka, A;
Revista Brasileira de Ciência Avícola , 2003, DOI: 10.1590/S1516-635X2003000100008
Abstract: the objective of this experiment was to investigate the effects of different particle sizes, expressed as geometric mean diameter (gmd) of corn (0.336mm, 0.585mm, 0.856mm and 1.12mm) of mash and pelleted broiler chicken diets on the weight of the gizzard, duodenum and jejunum+ileum; on the ph of the gizzard and small intestine and on the characteristics of the duodenal mucous layer (number and height of villi and crypt depth) in 42-day-old broilers. the physical form and the particle size of the diet had no significant effect on gizzard and intestine ph (p > 0.05). a greater gizzard weight was seen in the birds receiving pelleted diet and particle size of 0.336mm (p < 0.008). however, for the particle sizes of 0.856 and 1.12 mm, a greater weight was found in birds that received mash diet (p < 0.039 and p < 0.006, respectively). also, gizzard weight was greater with increasing corn gmd independent of the physical form of the diet. in the mash diet, the increase in particle size promoted a quadratic response in the weight of duodenum and jejunum + ileum. the pelleted diet promoted a greater number of villi per transverse duodenum cut (p < 0.007) and greater crypt depth (p < 0.05). as the particle size increased, there was a linear increase of villus height and crypt depth in the duodenum, irrespective of the physical form of the diet.
Effects of the reduction of dietary heat increment on the performance, carcass yield, and diet digestibility of broilers submitted to heat stress
Laganá, C;Ribeiro, AML;Kessler, AM;Kratz, LR;Pinheiro, CC;
Revista Brasileira de Ciência Avícola , 2007, DOI: 10.1590/S1516-635X2007000100007
Abstract: this experiment aimed at verifying the effect of different diets and thermal environments on the performance, carcass yield, and diet digestibility of 21 to 42-day-old broilers. a total number of 288 21-day-old male ross broilers were distributed in a 2 x 2 + 2 factorial arrangement, with six replicates, including the following factors: two environments (tne - thermoneutral: 21-25oc and 73% rh; chs - cyclic heat stress: 25-32oc and 65%rh), and two diets (control: 2.4% soybean oil and 19.5% protein; summer: 4.0% soybean oil and 18.5% protein). in tne, two additional treatments were included with feed restriction of birds fed both the control and summer diets (pair-feeding), thereby maintaining the same feed intake level for both types of diet. diet did not influence performance, dry matter and protein digestibilities, or carcass and part yields. tne birds had better performance (p<0.001) as compared to chs birds, but fcr was not different. chs birds had lower breast yield (p<0.0001), and higher thigh yield (p<0.02) than tne birds. in the pair-feeding treatments, environment did not influence performance, but dry matter digestibility was significantly lower in chs (p<0.03), whereas protein digestibility was not affected. the difference in feed intake was the main responsible factor for the variation in the performance of heat-stressed birds.
Effect of the supplementation of vitamins and organic minerals on the performance of broilers under heat stress
Laganá, C;Ribeiro, AML;Kessler, AM;Kratz, LR;Pinheiro, CC;
Revista Brasileira de Ciência Avícola , 2007, DOI: 10.1590/S1516-635X2007000100006
Abstract: the objective of this experiment was to evaluate the effect of diet supplementation with vitamins c and e and organic minerals zn and se on the performance of 1 to 35 day-old broilers from, kept under cyclic heat stress (25 to 32oc). four levels of vitamin-mineral supplementation were used (t1-control diet (60/30 iu of vit e for starter and growing diet, respectively, zero vit. c, 80 ppm of inorganic zn, 0.3 ppm of inorganic se); t2-control diet + 100 ui vit e and 300 ppm vit c/kg; t3-control diet + 40 ppm zn and 0,3 ppm se/kg; t4-control diet + t2 and t3 levels) and two environments - thermoneutral and cyclic heat stress (tn and hs) from 14 to 35 days of age. in the period when part of the birds was submitted to hs, from 14 to 35 days, it was observed lower feed intake (fi) and better feed conversion (fc) for hs birds receiving supplementation compared to the group without supplementation. evaluating the total period, all the types of supplementation provided lower fi and better fc than the control treatment, but not affected weight gain (wg). the supplementation of vitamins c and e and/or organic minerals zn and se improved the performance of birds due to a lower fi resulting in better fc, independently on the environment.
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