Impacts of Graded Levels of Metabolizable Energy on Growth Performance and Carcass Characteristics of Slow-Growing Yellow-Feathered Male Chickens

Abouelezz, K.F.M.; Wang, Y.; Wang, W.; Lin, Xuhui; Li, L.; Gou, Zhongyong; Fan, Qiuli; Jiang, Sufei

doi:10.3390/ani9070461

Cited by 24 publications

(21 citation statements)

References 39 publications

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“…Similar results were reported by Kalinowski et al [24] and Dozier et al [32]. Additionally, several studies indicated that evaluating the response of more than one variable to a dietary nutrient makes it difficult to determine a unique value of the nutrient requirement, i.e., the optimal level of any nutrient required for obtaining the best result of growth rate, body weight, feed intake, feed conversion ratio, meat quality, or immunity indices can differ [2,3,33]; this can explain the different values of optimal Met level for the different growth variables here.…”

Section: Discussionsupporting

confidence: 72%

“…The indigenous chickens have a recent increase in their commercial importance due to their favorable meat color and flavor, which highlights the need for comprehensive studies to enhance their feeding standards. However, only few researches on their nutrient requirements were conducted up till now [2][3][4][5].…”

Section: Introductionmentioning

confidence: 99%

“…Chinese yellow-feathered chickens grow slowly and are reared for a longer time compared with white-feathered broilers. The Lingnan yellow-feathered chicken breed is classified according to its growth rate to fast (1.47-2.30 kg, marketable at 8-10 weeks), medium (1.00-2.27 kg BW, marketable 9-14 weeks), and slow growing (1.06-1.88 kg BW, marketable 12-25 weeks) [3,15,16]. The Guangxi yellow-feathered chicken is a native, slow growing and light-body type breed with good meat quality in China (1.02-1.6kg BW, marketable 13-22 weeks).…”

Section: Introductionmentioning

confidence: 99%

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Modelling Methionine Requirements of Fast- and Slow-Growing Chinese Yellow-Feathered Chickens during the Starter Phase

Abouelezz

Cheng

et al. 2020

Animals

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Two experiments were carried out to investigate the dietary methionine requirement for fast and slow-growing Chinese yellow-feathered breeds during the starter phase, based on growth variables and regression models. In Experiment 1, a total of 2880 one-day-old Lingnan chicks (fast growing breed) were used to test the methionine requirement from 1 to 21 days of age for males and females separately. Of each gender, 1440 birds were allocated into 6 dietary methionine levels (0.28%, 0.32%, 0.37%, 0.43%, 0.50% and 0.63%), each with 6 pen replicates of 40 chicks. Experiment 2 had the same design with Guangxi chicks (slow growing breed) from 1 to 30 d of age. Results indicated that significant nonlinear or quadratic responses to increasing dietary methionine levels were observed in body weight, daily gain, feed intake and feed conversion ratio of both breeds. In summary, the quadratic polynomial regression showed that the optimal methionine requirements for maximal growth performance of Lingnan chickens were 0.52–0.58% in males, 0.51% in females, and 0.53% in mixed genders. The corresponding values for Guangxi breed were 0.53% in males by quadratic polynomial regression and 0.43% in females, and 0.48% to 0.49% in mixed sexes by exponential asymptotic models.

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Section: Discussionsupporting

confidence: 72%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Modelling Methionine Requirements of Fast- and Slow-Growing Chinese Yellow-Feathered Chickens during the Starter Phase

Abouelezz

Cheng

et al. 2020

Animals

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“…Likewise, Wang et al (2014) reported a significant decrease in abdominal fat due to the decreasing dietary energy density of broiler chickens. In contrast, other researchers did not observe significant differences in carcase and breast yield, heart or liver due to the use of different dietary energy levels (Infante-Rodr ıguez et al 2016;Abouelezz et al 2019). This variation in response could be attributed to differences in the dietary energy level or broiler breed used.…”

Section: Discussionmentioning

confidence: 75%

Effect of a multicarbohydrase supplementation to diets varying in metabolisable energy level on the performance, carcase traits, caecal microbiota, intestinal morphology, and nutrient digestibility in broiler chickens

Attia

Metwally

Beheiry

et al. 2021

Italian Journal of Animal Science

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This trial was conducted to investigate the effects of multi-carbohydrase supplementation on the performance, carcase traits, intestinal histomorphology, caecal microbiota and nutrient digestibility of broiler chickens fed diets with varying energy levels. A total of 400-day-old male chicks were allocated into eight dietary treatments in a 4 Â 2 factorial arrangement with 5 replicates per treatment. There were 4 dietary energy levels (the standard breed recommendation and reductions of 50, 100 and 150 kcal/kg from the standard) with or without multi-carbohydrase supplementation. Reducing the energy level by 50 kcal/kg did not significantly impact the measured parameters compared to the standard recommendation while it is reducing by 100 and 150 kcal/kg resulted in significant decreases in the body weight (BW) by levels up to 4.41% and a significant increase in the feed conversion ratio (FCR) by levels up to 4.67%. Enzyme supplementation significantly improved the BW and FCR by 3.24% and 2.95%, respectively. Dietary energy lowered by 100-150 kcal/kg resulted in a significant decrease in the dressing (up to 2.42%), breast yield (up to 2.82%), fat pads (up to 8.72%), liver (up to 6.30%) percentages and coliform count (up to 28.5%). The digestibility of dry matter, crude protein, ether extract and gross energy was increased due to enzyme supplementation by 4.15, 3.50, 3.35 and 3.72%, respectively. In conclusion, broiler performance and carcase traits can be negatively impacted if the energy density is reduced by 100-150 kcal/kg diet. Enzyme supplementation can improve the performance and nutrient digestibility regardless of the dietary energy level. HIGHLIGHTSThe metabolisable energy level can be reduced by 50 kcal/kg diets compared to the breed recommendation. Decreasing the energy level by 100 or 150 kcal/kg diet compared to breed recommendations resulted in a negative impact on the performance. Multicarbohydrase blend supplementation resulted in significant improvements in the performance and nutrient digestibility.

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“…Therefore, any strategy to reduce energy-related costs without adverse effect on broilers performance and their health may considerably increase the revenue of broiler production. So far, several studies have evaluated the effect of dietary energy on broiler growth performance (Infante-Rodriguez et al, 2016;Abouelezz et al, 2019). It is known that, aside from representing a potential energy source, the presence of dietary NSP may lead to higher intestinal viscosity, lower nutrient digestibility, impaired feed conversion ratio and consequently reduced bird growth performance (Lázaro et al, 2003;Meng et al, 2005).…”

Section: Introductionmentioning

confidence: 99%

Performance and Carcass Yields of Cobb 500 Broilers Fed Different Dietary Programs and Bioactive Additives

Osman

Ahmed

El-Deek

et al. 2019

EPSJ

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The experiment was performed to evaluate the impact of feeding different dietary programs having different levels of metabolizable energy (ME) during starter period and those of finisher ones which were less than that of the commercial standard (3150 kcal/kg) by 50, 100 and 150 kcal/kg with or without Bacillus amyloliquefaciens and energy enzymes on broilers productive performance and carcass characteristics. A total of 7300 Cobb 500 unsexed one day-old chicks were used. All chicks were fed pre-starter diet contained 23% crude protein (CP) and 2950 kcal ME /kg during the phase of (1-7) days. Afterward, experimental groups consist of 18 feeding programs where each program consists of two phases. During starter phase (8 -17) days, birds fed experimental diets contained constant level of CP (22%) with either of three ME levels (2950, 3000 or 3050 kcal/kg), whereas through the finisher phase (18 -35 days), birds received diets of constant level of CP (21%) with either of the three graded ME levels being 3100, 3050 or 3000 kcal/kg with or without studied additives for each. Results showed that the best live body weight, body weight gain and feed conversion ratio (FCR) were observed in dietary program included starter diet of 3050 kcal ME/kg and finisher one of 3100 kcal ME/kg with additives inclusion compared with the worst FCR of dietary program included starter diet of 2950 kcal ME/kg and finisher one of 3000 kcal ME/kg without additives. Carcass and abdominal fat weights were significantly improved (P≤0.05) by either feed programs with additives compared with those un-supplemented. Furthermore, and no significant effects on dressed and carcass cut weight were observed among dietary treatments. It can be concluded that, feeding dietary program included starter diet of 3050 kcal ME/kg with 22% CP and finisher one of 21% CP and 3100 kcal ME/kg (50 kcal/kg less than recommended) with bioactive additives had a beneficial effect on broiler productive performance and carcass yields.

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Impacts of Graded Levels of Metabolizable Energy on Growth Performance and Carcass Characteristics of Slow-Growing Yellow-Feathered Male Chickens

Cited by 24 publications

References 39 publications

Modelling Methionine Requirements of Fast- and Slow-Growing Chinese Yellow-Feathered Chickens during the Starter Phase

Modelling Methionine Requirements of Fast- and Slow-Growing Chinese Yellow-Feathered Chickens during the Starter Phase

Effect of a multicarbohydrase supplementation to diets varying in metabolisable energy level on the performance, carcase traits, caecal microbiota, intestinal morphology, and nutrient digestibility in broiler chickens

Performance and Carcass Yields of Cobb 500 Broilers Fed Different Dietary Programs and Bioactive Additives

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