scholarly journals EFFECT OF LOW CRUDE PROTEIN DIETS FORTIFIED BY LYSINE AND METHIONINE WITH PHYTASE ON PRODUCTIVE PERFORMANCE AND SOME PHYSIOLOGICAL TRAITS OF BROILER CHICKS

2021 ◽  
Vol 24 (2) ◽  
pp. 153-162
Author(s):  
S. El-Damrawy ◽  
S. Shalash ◽  
M. Abo Khashaba
Keyword(s):  
Crude Protein ◽  
Physiological Traits ◽  
Broiler Chicks ◽  
Productive Performance ◽  
Protein Diets

The effect of low crude protein diets supplemented with DL-methionine and L-lysine hydrochloride on male broiler performance

2005 ◽  
Vol 2005 ◽  
pp. 165-165
Author(s):  
N. Eila ◽  
H. R. Semnani
Keyword(s):  
Amino Acids ◽  
Protein Level ◽  
Crude Protein ◽  
Essential Amino Acids ◽  
Broiler Chicks ◽  
Broiler Performance ◽  
Low Protein ◽  
Limiting Amino Acids ◽  
Protein Diets ◽  
Crude Protein Level

Crude protein is an expensive nutrient in broiler diets and the supply of essential amino acids is more important than crude protein. Therefore it’s possible to reduce crude protein level by supplementing diets with methionine and lysine as limiting amino acids. The object of this study was assaying low protein diets supplemented with DL-methionine and L-lysine hydrochloride on male broiler chicks.

scholarly journals Effects of Dietary Crude Protein on Performance and Nitrogen Economy of Broilers

2013 ◽  
Vol 2 (3) ◽  
pp. 52 ◽  
Author(s):  
Malomo G. A. ◽  
Bolu S. A. ◽  
Olutade S. G.
Keyword(s):  
Amino Acids ◽  
Weight Gain ◽  
Feed Intake ◽  
Crude Protein ◽  
Nitrogen Retention ◽  
Broiler Chicks ◽  
Nitrogen Economy ◽  
Dietary Crude Protein ◽  
Faecal Nitrogen ◽  
Protein Diets

<p>This study assessed the effects of dietary crude protein on performance and nitrogen economy of broilers. Chicks were allotted to 22, 20, 18 and 16% crude protein corn-soy diets in a completely randomized design for forty-two days. Several essential amino acids were observed to be deficient compared to recommendations for broiler chicks as the dietary crude protein level reduced. Feed intake, weight gain, feed to gain ratio, faecal nitrogen, nitrogen retention, anthropogenic potential and dressing percentage were influenced (P &lt; 0.05) by the dietary treatments. However, mortality was not significantly different (P &gt; 0.05). Feed intake, weight gain, nitrogen intake and output were significantly (P &lt; 0.05) depressed as the CP level reduced. However, the best (P &lt; 0.05) nitrogen retention and percentage faecal nitrogen was recorded for broilers fed 20% crude protein diet. Serum total protein, albumin, uric acid, creatinine and glucose were affected (P &lt; 0.05) across treatments. It was concluded that there is a limit to which dietary crude protein of broilers could be reduced without any detrimental effects on the performance and nitrogen economy of the birds, even when the requirements for methionine and lysine has been met, as several other amino acids could be limiting. Consequently, to achieve significant improvement in nitrogen economy and reduction in amount of faecal nitrogen, 20% crude protein diets could be fed to broilers. However, there may be need to further manipulate the amino acid profile of the diet so as to improve its performance to be at par with higher crude protein diets.</p>

scholarly journals Determination of the Minimum Crude Protein Requirements of Broiler Starters and Finishers in the Tropics

2021 ◽  
Vol 3 (1) ◽  
pp. 126-138
Author(s):  
G. M. Babatunde ◽  
B. L. Fetuga
Keyword(s):  
Growth Rates ◽  
Crude Protein ◽  
Live Weight ◽  
Broiler Chicks ◽  
Protein Requirements ◽  
Protein Levels ◽  
The Third ◽  
Percent Nitrogen ◽  
The Tropics ◽  
Protein Diets

THREE experiments were conducted with broiler chicks to determine the minimum crude protein levels in the diets of broiler starters and finishers reared in a tropical environment. The first two trials covered both the starter and finisher periods of 12 weeks while the third experiment covered only the finishing period. The calculated dietary crude protein levels used in the first trial were 14,16 18, 20, 22 and 24%; in the second trial, 20, 22, 24 and 26% and in the third trial, 14, 16, 18 and 20% on air dry basis. Results showed the 24% crude protein (trial 1) and 26% crude protein (trial 2) diets promoted highly significantly better live weight gains than all the other rations during the starter period while during the finishing period, there were no significant differences in the liveweight gains on the diets containing 18, 20, 22, 24 and 24% although growth was always better on the higher protein diets. Diets containing 14, 16 and 18% crude protein were grossly inadequate for the broiler starters while during the finishing period, if all the birds were on adequate broiler starter diets before being put on finisher diets, all those diets promoted growth almost equally well, there being no significant differences among growth rates. The feed/gain ratios followed the same trends as obtained for growth rates, the ratios becoming significantly better for higher protein diets. Mortality was highest for the lowest protein diets and lowest for the highest protein diets, while the percent nitrogen retained tended to be better, though not significantly so, for the higher protein diets. On the basis of these studies, it is recommended that the diets of broiler starter chicks in the tropics should not contain less than 24% crude protein, while those of the finishers should not contain less than 18% crude protein on air dry basis for optimal results.  

scholarly journals Effect of protein concentrations in the diet on productive performance, carcass characteristics, and meat chemical composition of broiler chickens in the dry subtropics

Nova Scientia ◽  
2020 ◽  
Vol 12 (25) ◽  
Author(s):  
Fidel Infante-Rodríguez ◽  
Miguel Ángel Domínguez-Muñoz ◽  
Martín Francisco Montaño-Gómez ◽  
Michael E. Hume ◽  
Robin C. Anderson ◽  
...  
Keyword(s):  
Chemical Composition ◽  
Broiler Chickens ◽  
Crude Protein ◽  
Carcass Characteristics ◽  
Productive Efficiency ◽  
Broiler Chicks ◽  
Productive Performance ◽  
Genetic Management ◽  
Protein Levels ◽  
Dietary Crude Protein

Introduction: Current diets of broiler chickens tend to increase protein levels to obtain high productive variables that are achieved in combination with genetic, management, and sanitary improvements, among others. An increase in dietary crude protein levels does not always accompany an increase in broiler productive efficiency due to multiple factors involved in the production system. The objective of this study was to evaluate the effect of increasing levels of dietary crude protein (CP) on productive performance, carcass characteristics, and chemical composition of breast and thigh meat in broiler chickens raised in the dry subtropics of northeastern Mexico.Method: The study used 200, 1-day-old male Ross broiler chicks. In a completely randomized design, birds were allocated to the four treatments with five replicates (floor pens) of ten birds each. The trial was divided in two phases (starter and finisher) of 21 days each (42 days total). Treatment diets (T) for starter and finisher phases had crude protein concentrations (CP; %) of 21 and 18.1 (T1), 21.4 and 18.5 (T2), 21.8 and 18.9 (T3), and 22.2 and 19.3 (T4), respectively. Within each feeding phase, the four treatment diets were formulated to similar levels of apparent metabolizable energy.Results: Protein concentrations had no effect (P > 0.05) on weight gain, while feed intake was greater in T1 (P < 0.05) than in T2 and T3. Feed conversion was better in T2 and T4 (P < 0.05) than in T1. There was no influence of treatment on carcass weight or carcass cuts (P > 0.05). Carcass yield was greater in T1 than in T3 (P < 0.05). Breast and thigh dry matter and ether extracts were similar (P > 0.05) between treatments. Breast crude protein was greater (P < 0.05) in T2 than in T3. The lowest (P < 0.05) CP concentration in thigh meat was in T3.Discussion or Conclusion: These results indicated that in the dry subtropics area of northeastern Mexico increases in CP above the level of T2 (21.4% and 18.5% CP in starter and finisher diets, respectively) did not improve broiler chicken productive performance, carcass characteristics or meat chemical composition.

Dietary glycine equivalent and SID methionine+ cysteine levels for male broiler chickens fed low crude protein diets

2021 ◽  
Author(s):  
Paschal Chukwudi Aguihe ◽  
Ivan Camilo Ospina-Rojas ◽  
Márcia Izumi Sakamoto ◽  
Paulo Cesar Pozza ◽  
Eustace Ayemere Iyayi ◽  
...  
Keyword(s):  
Broiler Chickens ◽  
Crude Protein ◽  
Broiler Chicks ◽  
Optimum Growth ◽  
Breast Meat ◽  
Dietary Level ◽  
Randomized Design ◽  
Breast Meat Yield ◽  
Completely Randomized Design ◽  
Protein Diets

This study was conducted to determine the optimum dietary glycine equivalent (Glyequi) level in low crude protein (LCP) diets of 181 g/kg containing varied concentrations of standardized ileal digestible (SID) methionine+cysteine (Met+Cys) for broiler chicks (1-21d old). A total of 1275, 1-d-old Cobb-Vantress® male broilers were distributed in a 5 × 3 factorial arrangement of completely randomized design of 15 treatments with five replicates of 17 birds each. Treatments consisted of 5 levels of dietary Glyequi (14.9, 16.4, 17.9, 19.4 and 20.6 g/kg) and three concentrations of SID Met+Cys (7.70, 9.0 and 10.3 g/kg). Interactions between Glyequi and SID Met+Cys levels were observed for feed:gain (P = 0.055) and breast meat yield (BMY) (P = 0.017). In 7.7 and 9.0 g SID Met+Cys/kg diets, optimal feed:gain and increased BMY were observed at the Glyequi level not lower than 17.9 g/kg. In 10.3 g SID Met+Cys/kg diet, a lower feed:gain was achieved at 19.4 g Glyequi/kg. Therefore, a minimum dietary level of 17.9 g Glyequi/kg is needed to increase growth of broilers fed diets containing 7.7 or 9.0 g/kg SID Met+Cys while 19.4 g/kg Glyequi is necessary in diets containing 10.3 g/kg SID Met+Cys for optimum growth.

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