Níveis de energia metabolizável em rações pré-iniciais para frangos de corte

Xavier, Suzany Aparecida Gomes; Stringhini, José Henrique; Brito, Alexandre Barbosa de; Andrade, María Auxiliadora; Leandro, Nadja Susana Mogyca; Café, Marcos Barcellos

doi:10.1590/s1516-35982008000100016

Cited by 11 publications

(5 citation statements)

References 12 publications

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“…A similar result was found by Xavier et al (2008) for broilers at 7 d, when evaluating different energy levels in pre-starter feed.…”

Section: Live Weight (Kg)supporting

confidence: 86%

“…According to Xavier et al (2008), the presence of fatty acids at high levels can stimulate an increase in the secretion of digestive enzymes, promoted by hypertrophy of the secretory cells, causing an increase in the liver. Aletor et al (2003) suggest that, in high protein diets, the transport of metabolized lipids in the liver to other tissues may be increased by increased apolipoprotein synthesis, due to high availability of essential amino acids.…”

Section: Live Weight (Kg)mentioning

confidence: 99%

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Effect of nutrition on the body temperature and relative organ weights of broilers

Martins

Fernandes

Bueno

et al. 2015

SCA

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The objective of this study was to evaluate the effect of different nutritional plans on the body temperature and organ biometrics in male and female broilers, of two ages. Here, 1,700 birds were used (850 males and 850 females) in a completely randomized design composed of five treatments (-3%, -1.5%, reference, + 1.5% and + 3%), with 10 repetitions, totaling 50 experimental units; the reference treatment based on nutritional and energy levels indicated in previous studies was calculated from this. At 35 and 42 d, the temperatures of the wing, head, shin, back, and cloaca in males and females were measured separately, and the average surface and body temperature were calculated. At 42 d, relative weights of the gizzard, liver, heart, and small intestine were calculated. The temperatures of the wings, back, and cloaca, and consequently the average surface temperature and body temperatures, were not affected by nutritional plans. Effects of increasing the nutritional and energy levels were observed on liver weights, the gizzard, and the small intestine. We conclude that the nutritional plans did not affect body temperature. Males had higher body temperatures than females. Body temperature increased with increase in age, and the increase in the nutritional plans increased liver weight and reduced the gizzard weights. Key words: Animal nutrition, body temperature, digestive system, poultry ResumoObjetivou-se avaliar a temperatura corporal e o peso relativo de órgãos em frangos de corte, machos e fêmeas, em duas idades, submetidos a diferentes planos nutricionais. Foram utilizadas 1700 aves (850 machos e 850 fêmeas) distribuídas em um delineamento inteiramente casualizado, composto de cinco tratamentos (-3%, -1.5%, referência, +1.5% e +3%) com 10 repetições, totalizando 50 unidades experimentais; sendo o tratamento referência baseado nos níveis nutricionais e energéticos recomendados por Rostagno et al. (2011) e os demais calculados a partir deste. Aos 35 e 42 dias de idade foram mensuradas as temperaturas da asa, cabeça, canela, dorso e da cloaca nos machos e fêmeas separadamente, e após calculou-se a temperatura superficial média e corporal. Aos 42 dias de idade também foram calculados os pesos relativos da moela, fígado, coração e intestino delgado. As temperaturas de asa, dorso e cloaca não foram afetadas pelos planos nutricionais, e consequentemente as temperaturas superficial média e corporal. Observou-se efeito do aumento dos níveis nutricionais e energéticos nos pesos do fígado, moela e do intestino delgado. Conclui-se que os planos nutricionais não influenciaram a temperatura corporal. Os machos apresentaram maior temperatura corporal que as fêmeas. A temperatura corporal se elevou conforme aumentou a idade. O aumento dos planos nutricionais aumentou o peso do fígado e reduziu o peso da moela.

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“…A similar result was found by Xavier et al (2008) for broilers at 7 d, when evaluating different energy levels in pre-starter feed.…”

Section: Live Weight (Kg)supporting

confidence: 86%

Section: Live Weight (Kg)mentioning

confidence: 99%

Effect of nutrition on the body temperature and relative organ weights of broilers

Martins

Fernandes

Bueno

et al. 2015

SCA

View full text Add to dashboard Cite

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“…The survey results differ from those reported by Mendonça et al (2008), who found no effect of dietary energy levels (2.600, 2.750, 2.900, 3.050, 3.200 kcal / kg ME) on the weight gain of males ISA Label in periods of 1 to 21 days of age reared under semi-confined . Xavier et al (2008), analyzing the performance of chickens (Avian × Cobb) in the pre-start, no significant effect was observed with increasing levels of dietary metabolizable energy (2.850, 2.950, 3.000, 3.050 and 3.150kcal / kg).…”

Section: Resultsmentioning

confidence: 90%

Using different levels of energy in the diet of chicken slow-growing strain of rustic French Pedrês (Barre Gris Cou Nu)

Vieira¹,

Loureiro²,

Lima³

et al. 2023

Braz. J. Anim. Environ. Res.

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This study aimed to evaluate the effect of the energy levels on growth performance and yield of the broilers Caipira French Pedrês, slaughtered at 77, 84 and 90 days old. We used 192 day old chicks, mixed, reared under intensive birds/m2 density of 6.4. The experimental design was completely randomized with four replications of three treatments, the experimental unit being a box of 16 birds. Treatments were defined by the energy levels of the diets in the initial phase (1-28 days) and fattening (29 to 91 days) were: T1 - 3.000/3.100 kcal / kg, T2 –3.100/3.200 kcal / kg and T3 -3.200/3.300 kcal / kg. The variables studied were average weight, feed intake, weight gain, feed conversion efficiency, protein efficiency ratio, carcass yield, prime cuts (breast, thigh on thigh),wings, back, head + neck and feet. The birds showed better growth performance and carcass yield and cuts when fed diets containing 3,000 kcal / kg of the initial phase and 3,100 kcal / kg in the final stage, can be slaughtered at 77 days old.

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“…The absolute liver weight (57.41 g) was obtained with the level of 3109 kcal/kg, and the highest relative liver weight (2.56%), with a level of 3190 kcal/kg. This effect shows that the energy levels evaluated directly influenced the metabolism of the liver and, according to Xavier et al (2008), higher amounts of metabolizable energy may increase the secretion of digestive enzymes due to hypertrophy of the secretory Table 5 -Energy level effect on body weight, weight gain, feed intake, feed:gain ratio, metabolizable energy intake of fast-growing broilers in a free-range system.…”

Section: Experiments 2 -Metabolizable Energy In Fastgrowing Broilers Imentioning

confidence: 98%

Metabolizable energy for broilers with different genetic growth potentials under a free-range system

Massi¹,

Lima²,

Machado³

et al. 2018

Bol. Ind. Anim.

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The objective of this study was to evaluate the effects of different levels of metabolizable energy (ME) on performance parameters and carcass characteristics in slow-growing (experiment 1) and fast-growing (experiment 2) broilers in a free-range system. Were evaluated broilers from 35 to 70 days old in experiment 1 and 28 to 49 days old in experiment 2. A completely randomized experimental design was employed in both experiments, with five treatments and four replicates totaling 20 experimental units containing 15 broilers each. The treatments consisted of rations that had increasing metabolizable energy levels obtained by the substitution of soybean oil in the basal diet for the inert sand ingredient. The metabolizable energy levels studied in experiment 1 were 2700, 2800, 2900, 3000 and 3100 kcal/kg, and in experiment 2, they were 2800, 2900, 3000, 3100 and 3200 kcal/kg. In experiment 1, there was a linear (P<0,05) reduction in consumption with the increase in the metabolizable energy level, and a quadratic effect (P<0,05) on the feed conversion was observed, which was estimated as 3046 kcal/kg the level that resulted in a better feed conversion of 2.648. In experiment 2, the metabolizable energy level exerted a significant quadratic effect (P<0,05) on the feed intake and metabolizable energy consumption, with a maximum feed intake (3361.27 g) estimated for 2842 kcal/kg, and the maximum energy intake was estimated at 10020 kcal. The feed conversion decreased linearly (P<0,05) with there was an increase in the studied levels. For broilers reared in a free-range system, for better feed conversion, the recommended metabolizable energy levels are as follows: for slow-growing broilers from 35 to 70 days of age, 3046 kcal/kg, and 3200 kcal/kg is recommended for fast-growing broilers from 28 to 49 days of age.

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Níveis de energia metabolizável em rações pré-iniciais para frangos de corte

Cited by 11 publications

References 12 publications

Effect of nutrition on the body temperature and relative organ weights of broilers

Effect of nutrition on the body temperature and relative organ weights of broilers

Using different levels of energy in the diet of chicken slow-growing strain of rustic French Pedrês (Barre Gris Cou Nu)

Metabolizable energy for broilers with different genetic growth potentials under a free-range system

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