scholarly journals Egg performance, egg quality, and nutrient utilization in laying hens fed diets with different levels of rapeseed expeller cake

2008 ◽  
Vol 19 (3) ◽  
pp. 233 ◽  
Author(s):  
S. SWIATKIEWICZ ◽  
J. KORELESKI ◽  
A. ARCZEWSKA-WLOSEK
Keyword(s):  
Crude Protein ◽  
Laying Hens ◽  
Egg Quality ◽  
Nutrient Utilization ◽  
Metabolizable Energy ◽  
Available Phosphorus ◽  
Dietary Level ◽  
Calcium And Phosphorus ◽  
Egg Performance ◽  
Different Levels

The aim of this study was to evaluate the effect of different levels of rapeseed expeller cake (RC) in the diet of laying hens on egg performance, egg quality, retention and excretion of nitrogen, calcium and phosphorus, and metabolizability of energy. The experiment was carried out with 72 Bovans Brown hens, from 28 to 53 weeks of age. Experimental treatment consisted of four isonitrogenous and isocaloric corn-soybean diets (as calculated: 17% crude protein, 11.6 MJ/kg metabolizable energy, 0.81% lysine, 0.36% methionine, 3.60% calcium and 0.37% available phosphorus), containing 0, 4, 6 or 8% RC. The RC used was produced from double zero rapeseed and contained 29.3% crude protein, 17.4% crude fat, 10.8% crude fibre, 0.63% calcium, 0.97% phosphorus, 1.91% lysine and 0.84% methionine. During the experimental period, the dietary level of RC had no significant effects on egg performance and egg quality parameters. Boiled eggs from hens fed a diet with 8% RC were characterized by an inferior flavour to those from other groups. There were no treatment effects on nitrogen balance or metabolizability of energy, though the highest dietary level of RC negatively affected retention and excretion of calcium and phosphorus.;

scholarly journals Effect of protein and energy levels in a constant ratio supplemented with methionine and lysine on performance of layers and on egg quality.

1980 ◽  
Vol 28 (1) ◽  
pp. 29-35
Author(s):  
A.R. El Boushy ◽  
L.G.M. van Gils ◽  
M.C. Papadopoulos
Keyword(s):  
Feed Intake ◽  
Crude Protein ◽  
Egg Production ◽  
Laying Hens ◽  
Egg Quality ◽  
Energy Levels ◽  
Metabolizable Energy ◽  
Constant Ratio ◽  
Feed Conversion ◽  
Egg Weight

Twenty groups of 36 laying hens in individual cages were fed on one of 5 diets in which the energy:protein ratio was constant. Diets 1 to 5 had crude protein 12.0, 12.9, 14.0, 15.0 and 16.0% and metabolizable energy 8.71, 9.57, 10.27, 11.10 and 11.70 MJ/kg. From 24 to 64 weeks old, egg production of hens given diets 1 to 5 was 71.46, 71.31, 72.51, 71.13 and 69.99%, respectively. Corresponding values of mean egg weight, weekly feed intake and efficiency of feed conversion were 60.51, 60.47, 61.11, 61.02, 61.07 g; 157.16, 147.56, 142.03, 130.37, 126.72 g; 3.674, 3.460, 3.262, 3.031, 3.014 kg feed/kg egg, respectively. (Abstract retrieved from CAB Abstracts by CABI’s permission)

scholarly journals Enzymatic association in the diets of laying hens raised in an alternative cage-free system

2021 ◽  
Vol 56 ◽  
Author(s):  
Valquíria Sousa Silva ◽  
Kênia Ferreira Rodrigues ◽  
Everton Luis Krabbe ◽  
Roberta Gomes Marçal Vieira Vaz ◽  
Valdir Silveira de Ávila ◽  
...  
Keyword(s):  
Laying Hens ◽  
Egg Quality ◽  
Metabolizable Energy ◽  
Available Phosphorus ◽  
Productive Performance ◽  
Nutrient Requirements ◽  
Free System ◽  
Performance Variables ◽  
Apparent Metabolizable Energy

Abstract: The objective of this work was to evaluate the use of enzyme combinations in diets, with different nutritional uplift matrices, for hens raised in an alternative cage-free system. The experiment was carried out with 800 Isa Brown laying hens aged 24-30 weeks, distributed in a 2x2 factorial arrangement, with two combinations of enzymes (phytase and xylanase) and two nutritional matrices (conventional and overvalued uplifts). The treatments were: T1, phytase (450 FTU per kilogram) + xylanase (12,000 BXU per kilogram), using matrix I (100 Kcal kg-1 apparent metabolizable energy, 0.16% calcium, 0.15% available phosphorus, 0.03 sodium, and 0.02% digestible lysine); T2, phytase (1,500 FTU per kilogram) and matrix I; T3, phytase (450 FTU per kilogram) + xylanase (12,000 BXU per kilogram), using matrix II (120 Kcal kg-1 apparent metabolizable energy, 0.22% calcium, 0.20% available phosphorus, 0.04% sodium, and 0.05% digestible lysine); and T4, phytase (1,500 FTU per kilogram) and matrix II. Productive performance variables and external and internal egg quality were analyzed. The use of phytase or of the phytase + xylanase combination, independently of the nutritional matrix used, met the nutrient requirements of the animals and maintained their productive performance. However, the combination phytase + xylanase and the adoption of matrix I was more efficient.

scholarly journals Available phosphorus in poultry. 1. Effect of phosphorus levels on the performance of laying hens and their egg quality, hatchability, bone analysis and strength in relation to calcium and phosphorus in blood plasma.

1979 ◽  
Vol 27 (2) ◽  
pp. 176-183
Author(s):  
A.R. El Boushy
Keyword(s):  
Shell Thickness ◽  
Egg Production ◽  
Laying Hens ◽  
Egg Quality ◽  
Breaking Strength ◽  
Available Phosphorus ◽  
Inorganic P ◽  
Shell Quality ◽  
Calcium And Phosphorus ◽  
Phosphorus Levels

1. For 6 months 432 medium heavy laying hens were given diets which supplied 0.16, 0.20, 0.40, 0.60, 0.80 or 1.00% available phosphorus. Egg production was greatest by hens given 0.20 or 0.40% P and least by those given 0.16%. Feed intake did not differ among groups. Heaviest eggs, 62.2 g, were laid by hens given 1.00% P. Shell quality, determined from shell percentage, shell thickness and shell index, decreased as P in the diet increased. Hatchability, yolk and white indices of eggs and calcium, P and ash in tibiae of chicks one day old did not differ among groups. Ca in blood of hens did not differ among groups but inorganic P in plasma increased with increasing P in the diet. Ash, Ca and P in tibiae and breaking strength of tibiae of hens increased with increasing P in the diet. (Abstract retrieved from CAB Abstracts by CABI’s permission)

scholarly journals Levels of available phosphorus and calcium for broilers from 8 to 35 days of age fed rations containing phytase

2010 ◽  
Vol 39 (6) ◽  
pp. 1237-1245 ◽  
Author(s):  
Adimar Cardoso Júnior ◽  
Paulo Borges Rodrigues ◽  
Antônio Gilberto Bertechini ◽  
Rilke Tadeu Fonseca de Freitas ◽  
Renato Ribeiro de Lima ◽  
...  
Keyword(s):  
Crude Protein ◽  
Dry Matter ◽  
Control Diet ◽  
Metabolizable Energy ◽  
Available Phosphorus ◽  
Broiler Chicks ◽  
Food Conversion ◽  
Significant Difference ◽  
Calcium And Phosphorus ◽  
Four Levels

Two experiments using Cobb broiler chicks from 8 to 35 days of age were carried out to evaluate the effect of reducing levels of calcium and available phosphorus in diets supplemented with 500 ftu phytase/kg on the performance of the birds, the content of ashes in the tibia, the metabolizable energy of the diet, and the metabolizability of the dry matter and crude protein. It was used 1,404 broiler chicks in the experiment 1 to evaluate feed intake, weight gain, food conversion and percentage of the ashes in the tibia. In the experiment 2, simultaneously carried out with experiment 1, a total of 390 birds were transferred to a metabolism room to determine the metabolizable energy and metabolizability of the dry matter and crude protein. It was used in the two experiments, a complete random design in a 3 × 4 + 1 factorial scheme with three levels of available phosphorus (0.375; 0.325; and 0.275%) and four levels of calcium (0.85; 0.75; 0.65 and 0.55%) in the diets, supplemented with phytase. It was also used a control diet without phytase, based on corn and soybean bran, formulated with 0.425% of available phosphorus and 0.85% of calcium. In the experiment 1, the reduction of levels of calcium and phosphorus did not cause a significant difference on the performance and percentage of bone ashes. The levels of calcium and available phosphorus used in the experiment 2 can be reduced down to 0.65 and 0.325%, respectively, because the effects are similar to those obtained with the currently suggested levels.

scholarly journals Effects of Varying Levels of Dietary Metabolizable Energy and Crude Protein on Performance and Egg Quality of Organic Laying Hens

2009 ◽  
Vol 35 (4) ◽  
pp. 367-373 ◽  
Author(s):  
Dong-Jo Yu ◽  
Jae-Cheon Na ◽  
Hee-Chul Choi ◽  
Han-Tae Bang ◽  
Sang-Ho Kim ◽  
...  
Keyword(s):  
Crude Protein ◽  
Laying Hens ◽  
Egg Quality ◽  
Metabolizable Energy
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