Growth Performance, Meat Yield, and Economic Responses of Broilers Fed Diets Varying in Metabolizable Energy from Thirty to Fifty-Nine Days of Age

Dozier, W. A.; Price, C. J.; Kidd, M. T.; Corzo, A.; Anderson, John; Branton, S. L.

doi:10.1093/japr/15.3.367

Cited by 53 publications

(35 citation statements)

References 28 publications

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“…At present, many studies were conducted to examine the effects of the dietary energy on the growth of broiler chickens. Increasing dietary energy level could improve feed conversion rate of broilers by reducing feed intake (Jackson et al, 1982a;Dozier et al, 2006Dozier et al, , 2007Ghaffari et al, 2007). However, high dietary energy caused deposition of excess abdominal fat or carcass fat in broilers (Jackson et al, 1982b;Summers et al, 1992;Ghaffari et al, 2007), and this fat was usually considered to be waste product when birds were processed further, which indicated the economic loss for poultry producers.…”

Section: Introductionmentioning

confidence: 99%

Effects of Dietary Energy on Growth Performance and Carcass Quality of White Growing Pekin Ducks from Two to Six Weeks of Age

et al. 2008

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A dose-response experiment with 6 dietary energy levels (2,600, 2,700, 2,800, 2,900, 3,000, 3,100 kcal of AME /kg) was conducted to study the effects of dietary energy on growth performance and carcass quality of White Pekin ducks from 2 to 6 wk of age. Six hundred 14-d-old White Pekin ducks were randomly divided to 6 dietary treatments, each containing 5 replicate pens with 10 males and 10 females per pen, and these birds were raised until 6 wk of age. At 42 d of age, weight gain, feed intake, and feed:gain of ducks from each pen were measured, and 2 ducks (1 male and 1 female) selected randomly from each pen were slaughtered to evaluate the yields of abdominal fat, breast meat (including pectoralis major and pectoralis minor), and leg meat (including thigh and drumstick). As dietary energy increased from 2,600 to 3,100 kcal of AME/kg, the weight gain of ducks increased significantly, and the feed intake and feed:gain decreased significantly. According to the broken-line regression analysis, the AME requirements of White Pekin ducks from 2 to 6 wk of age for optimal weight gain and feed:gain were 3,008 and 3,030 kcal/kg, respectively, when dietary protein was 18%. On the other hand, high dietary energy did not affect breast and leg meat (P > 0.05), but abdominal fat increased (P < 0.05) when dietary AME was above 2,700 kcal/kg.

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Section: Introductionmentioning

confidence: 99%

Effects of Dietary Energy on Growth Performance and Carcass Quality of White Growing Pekin Ducks from Two to Six Weeks of Age

et al. 2008

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“…Therefore, 3,040 and 3,140 kcal of AME n /kg were considered to be moderate and high AME n values used in commercial practice. Dietary amino acid concentrations were not increased in the high AME n diets to minimize confounding effects attributable to amino acid intake because dietary AME n concentration, similar to AME n concentrations used in the present research, has been reported not to influence feed intake with broilers during the starter period [4], which is in contrast with research conducted with finishing broilers [12][13][14]. With the present research, we did not adjust dietary amino acid concentrations as AME n changed in the experimental diets during the starter period, on the basis of previous research [4].…”

Section: Dietary Treatmentsmentioning

confidence: 70%

“…Dozier et al [14] determined, with broilers provided diets varying in AME n from 3,175 to 3,310 kcal/kg during 30 to 59 d of age, that feed consumption was decreased by 223 g, resulting in a 14-point improvement in feed conversion from 30 to 59 d of age. Older broilers, under certain conditions, have the physical capacity to regulate feed consumption when diets vary in AME n within practical limits [12][13][14]. Conversely, Hidalgo et al [4] found no differences in feed consumption when broilers were fed diets formulated in AME varying from 2,976 to 3,197 kcal/kg during the starter period.…”

Section: Methodsmentioning

confidence: 99%

“…The young chick may not consume enough energy or amino acids to compensate for the decrease in dietary nutrient density. Conversely, research evaluating AME n responses with broilers during the finishing period indicated that BW is not adversely affected by reducing AME n , and older broilers under some conditions have the physical capacity to increase feed intake to compensate for reductions in AME n [12][13][14].…”

Section: Description Of Problemmentioning

confidence: 99%

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Apparent Metabolizable Energy Needs of Broiler Chicks Subjected to Diverse Ambient Temperature Regimens

Dozier

Corzo

Kidd

2008

Journal of Applied Poultry Research

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SUMMARYEarly chick performance is adversely affected by inadequate ambient temperatures. Increasing AME n may help alleviate poor performance with chicks subjected to low brooding temperatures. This study examined the effects on subsequent growth and meat yield responses in broiler chicks provided diets formulated to either 3,040 or 3,140 kcal of AME n /kg when subjected to diverse ambient temperatures from 0 to 15 d. Two experiments were conducted. In experiment 1, ambient temperature was considered optimum and was held constant, with set points of 34°C from placement (0 d) to 4 d, 32°C from 5 to 9 d, and 29°C from 10 to 15 d. In experiment 2, suboptimal ambient temperatures (held constant) were 29°C from placement to 3 d, 28°C from 4 to 6 d, 26°C from 7 to 11 d, and 25°C from 12 to 15 d. In both experiments, diet and temperature were common from 16 to 40 d. Energy consumption per unit of gain from 0 to 15 d was improved with chicks fed the moderate AME n (3,040 kcal of AME n /kg; 1,553 kcal of AME n intake) diet compared with chicks fed the high AME n (3,140 kcal of AME n /kg; 1,614 kcal of AME n intake) diet in experiment 1. From 0 to 15 d, feed conversion was improved with chicks provided the high AME n diet (3,140 kcal of AME n /kg; 1,689 kcal of AME n intake) over that of chicks fed the moderate AME n diet (3,040 kcal of AME n /kg; 1,678 kcal of AME n intake) in experiment 2. In both experiments, dietary treatments did not influence final BW gain, cumulative feed conversion, or breast meat yield. Providing chicks with a diet containing moderate AME n (3,040 kcal of AME n /kg) when subjected to diverse brooding temperatures was adequate to support cumulative growth responses.

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“…According to Dozier et al (2006), the dietary energy level controls the food intake of broilers, where higher available energy reduces food intake. Thus, this lower feed intake may have reduced the size of the gizzard, due to lower work done by that organ.…”

Section: Live Weight (Kg)mentioning

confidence: 99%

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

et al. 2015

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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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Growth Performance, Meat Yield, and Economic Responses of Broilers Fed Diets Varying in Metabolizable Energy from Thirty to Fifty-Nine Days of Age

Cited by 53 publications

References 28 publications

Effects of Dietary Energy on Growth Performance and Carcass Quality of White Growing Pekin Ducks from Two to Six Weeks of Age

Effects of Dietary Energy on Growth Performance and Carcass Quality of White Growing Pekin Ducks from Two to Six Weeks of Age

Apparent Metabolizable Energy Needs of Broiler Chicks Subjected to Diverse Ambient Temperature Regimens

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

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