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Search Results: 1 - 10 of 14359 matches for " Penz Jr AM "
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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.
Efeito da Energia, Rela o Energia: Proteína e Fase de Crescimento Sobre o Desempenho e Composi o de Carca a de Frangos de Corte
Reginatto MF,Ribeiro AM,Penz Jr AM,Kessler AM
Revista Brasileira de Ciência Avícola , 2000,
Abstract: Dois experimentos (EXP) avaliaram os efeitos da redu o de proteína bruta (PB) em dietas com alta (A) (3.200kcal EM/kg) e baixa (B) (2.900kcal EM/kg) energia, sobre o desempenho e composi o de carca as de frangos de corte machos. Os níveis de PB foram reduzidos para obter as rela es energia: proteína (E:PB) 139, 146, 153 e 160 (kcal/%) para as dietas iniciais (EXP 1), e 160, 167, 174 e 181(kcal/%) para as dietas de crescimento (EXP 2), em ambos os níveis de energia, mantendo constantes os níveis de MET+CIS e LIS. Todas as aves receberam uma mesma dieta antes (EXP 2) ou após (EXP 1) o fornecimento das dietas experimentais. O fornecimento das dietas A proporcionou melhor desempenho, no entanto resultou em maior deposi o de gordura nas carca as. No EXP 1, as aves alimentadas com as dietas B apresentaram ganho de peso (GP) similar àquelas alimentadas com as dietas A no período total (1 a 42 dias), porém melhor convers o calórica (CC) (kcal/kg) (p<0,01). Foi observada também melhor CC, com rela o E:PB 139. Menores níveis de PB dietética resultaram, algumas vezes, em um menor GP, porém sempre foi verificada uma pior CC nas rela es mais amplas E:PB. Em ambos os Experimentos (EXP), o maior nível de energia e a redu o da PB dietética melhoraram a utiliza o da PB consumida.
Suplementa o de Treonina em Dietas de Frangos de Corte, Variando a Energia e as Rela es Energia: Proteína
Reginatto MF,Ribeiro AML,Penz Jr AM,Kessler AM
Revista Brasileira de Ciência Avícola , 2000,
Abstract: Dois experimentos (EXP 1 e 2) foram conduzidos para avaliar rela es energia metabolizável:proteína bruta (EM:PB) e a adi o de treonina (Thr) em dietas com alta (A) (3.200kcal EM/kg) e baixa (B) (2.900kcal EM/kg) energia, sobre desempenho e composi o de carca as de frangos de corte machos. As rela es energia:proteína foram 139 e 160 kcal/%, para as dietas iniciais (1 a 21 dias) (EXP 1) e 160 e 181kcal/%, para as de crescimento (22 a 40 dias) (EXP 2), nos dois níveis de energia. As dietas com ampla rela o EM:PB foram suplementadas, ou n o, com Thr a fim de iguala-las às dietas com menor EM:PB. Os níveis de Met+Cys e de Lys foram constantes. As aves receberam uma dieta única após (EXP1), ou antes (EXP2) do fornecimento das dietas experimentais. Nos dois EXP as dietas A proporcionaram melhor desempenho: ganho de peso (GP),consumo de ra o e convers o alimentar (CA) (p<0,01), ao final de cada período experimental. Porém, no EXP 1, as aves que receberam dietas B tiveram melhor convers o calórica (CC, kcal/kg,) (p<0,01) no período total (1 a 40 dias), indicando um período de crescimento acelerado. Os níveis de Thr (0,74 e 0,69% para A e B respectivamente) das dietas com rela o EM:PB ampla n o foram limitantes no desempenho das aves. No EXP 2, a EM:PB 181 deprimiu o GP (p<0,08) e piorou a CA (p<0,01), nas energias A e B. Portanto, em dietas práticas iniciais, Thr n o foi um aminoácido (AA) limitante. Porém, de 22 a 40 dias, a adi o de Thr foi necessária, em dietas com EM:PB 181kcal/%(EXP 2). A suplementa o de Thr n o influenciou a composi o das carca as nos dois EXP.
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.
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,
Abstract: Foram oferecidas 4 doses de ácido nicotínico (AN) na água de beber de frangos de corte, a fim de estudar seu efeito no desempenho e na produ o de calor em condi es de estresse por calor (6 h de 35o C). As doses foram 15, 100, 330 e 1000 mg/L. N o houve efeito do AN nas doses usadas para ganho de peso, consumo de alimento, eficiência alimentar, consumo de água e temperatura retal. Foram observadas algumas altera es devido ao AN e estresse por calor nos parametros sangüíneos das aves. A produ o de calor (kcal/h/peso metabólico) diminuiu com o uso de 100 e 1000 mg/L comparados com 15 mg/L. Nas dosagens usadas n o foi observado efeito benéfico do AN no controle do estresse por calor.
Efeito da Energia, Rela??o Energia: Proteína e Fase de Crescimento Sobre o Desempenho e Composi??o de Carca?a de Frangos de Corte
Reginatto, MF;Ribeiro, AM;Penz Jr, AM;Kessler, AM;Krabbe, EL;
Revista Brasileira de Ciência Avícola , 2000, DOI: 10.1590/S1516-635X2000000300005
Abstract: two experiments (exp) were carried out to investigate the effects of crude protein (cp) levels reduction in high-energy (h) (3.200kcal me/kg) and low-energy (l) (2.900kcal me/kg) diets, on the performance and carcass composition of male broiler chickens. the cp levels were decreased to meet the following energy: protein (e:pb) ratios: 139, 146, 153 and 160 (kcal/%) for starter diets (exp 1) and 160, 167, 174 and 181 (kcal/%) for grower diets (exp 2), in both energy levels, keeping met + cis and lys levels at the same concentration. all birds received a same diet before (exp 2) or after (exp 1) feeding the experimental diets. feeding h diets resulted in better performance, but also in higher carcass fat deposition. in exp 1, birds fed with l diets during the starter period had similar body weight gain (bwg), in the total period (1 to 42 days), than those h diets, however with better caloric conversion (kcal/kg) (cc). also, the best cc was obtained with e:pb of 139. lower bwg, sometimes occurred with lower levels of dietary cp, but in all experiments the cc was decreased with wider e:pb ration. in both exp, protein utilization was improved with higher levels of dietary energy and with lower levels of dietary cp.
Fatty-Acid composition of free-choice starter broiler diets
Kessler, AM;Lubisco, DS;Vieira, MM;Ribeiro, AML;Penz Jr, AM;
Revista Brasileira de Ciência Avícola , 2009, DOI: 10.1590/S1516-635X2009000100006
Abstract: two experiments were carried out to evaluate the inclusion of vegetable oils with different fatty acid content in starter and pre-starter broiler diets. in experiment i 480 1- to 9-day-old male ross 308 broilers were fed diets containing corn oil (co), acid corn oil (aco), linseed oil (lo) or coconut fat (cof). chicks were distributed according to a factorial 2x2x2arrangement (2 free fatty acids - ffa ) x (2 n6:n3 ratios) x (2 medium-chain fatty acids levels - agmc). performance responses and dry matter (dmm), crude protein (cpm), and crude fat (cfm) metabolizability were evaluated. in experiment ii, 480 1- to 20-day-old male ross 308 broilers were offered the free choice of 2 different diets: with no fat addition, or with 10% addition of the following fat sources: co, lo, cof, soybean soapstock (sbs), acid soybean oil (aso), or acid cottonseed oil (acto). performance responses and diet selection were evaluated. in experiment i, there were no significant effects of the diets on performance, dmm, or cpm; however, the inclusion of ffa depressed cfm. in experiment ii, there was a marked preference of birds of the diets with fat inclusion, leading to the selection of diets with more than 3100 kcal/kg me in the period of 1 to 20 days, independently of fat source. the broilers selected the high fat and energy diets since the first days of age, which resulted in better bird performance.
Suplementa??o de Treonina em Dietas de Frangos de Corte, Variando a Energia e as Rela??es Energia: Proteína
Reginatto, MF;Ribeiro, AML;Penz Jr, AM;Kessler, AM;Krabbe, EL;
Revista Brasileira de Ciência Avícola , 2000, DOI: 10.1590/S1516-635X2000000300006
Abstract: two experiments (exp) were carried out to investigate the metabolizable energy:crude protein ratios (me:cp) and threonine addition (thr) in high-energy (h) (3.200kcal me/kg) and low-energy (l) (2.900kcal me/kg) diets, on the performance and carcass composition of male broiler chickens. the me:cp ratios were: 139 and 160kcal/% for starter diets (1 to 21 days of age) (exp 1) and 160 and 181kcal/% for grower diets (22 to 40 days)(exp 2), in both energy levels, keeping met + cys and lys constant. thr was supplemented to equalize its level to the lower em:pb ratio. all birds received a unique diet after (exp 1) or before (exp 2) been fed with the experimental diets. in both exp feeding h diets resulted in better performance -weight gain (wg), feed intake (fi) and feed conversion (fc) (p<0,01) at the end of each experimental period. however, in exp 1, birds fed with l diets during the starter period had better caloric conversion (kcal/kg) (cc) in the total period (1 to 40 days), as an indicative of accelerated growth. the lower levels of thr (0.74 and 0.69% for h and l diets, respectively) were not limiting for birds' performance. on exp 2, the 181 me:cp decreased wg (p<0.08) and increased fc (p<0.01) in both energy levels. thr was not a limiting amino acid in initial practical diets (1 to 21 days of age). on the other hand, thr supplementation improved performance of birds at 181 e:cp (22 to 40 days) (exp2). thr addition did not influence carcass composition in both exp.
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