scholarly journals Effects of Different Levels of Dietary Crude Protein on Egg Production and Quality in Laying Hens during Early Stage of Egg Production

2013 ◽  
Vol 40 (4) ◽  
pp. 361-368
Author(s):  
Yun Kyung Choo ◽  
Hyung Joo Kwon ◽  
Sung Taek Oh ◽  
Yong Ran Kim ◽  
Eun Jib Kim ◽  
...  
Keyword(s):  
Crude Protein ◽  
Egg Production ◽  
Laying Hens ◽  
Early Stage ◽  
Dietary Crude Protein ◽  
Different Levels

scholarly journals The Excretion of Ca, Mg, Zn and Cu Through Excreta of Laying Hens Fed Two Different Levels of Protein with and without Phytase

2019 ◽  
Vol 7 (1) ◽  
pp. 68
Author(s):  
Skender Muji ◽  
Alltane Kryeziu ◽  
Muhamet Kamberi ◽  
Ragip Kastrati ◽  
Nuridin Mestani
Keyword(s):  
Crude Protein ◽  
Egg Production ◽  
Laying Hens ◽  
Egg Mass ◽  
Egg Weight ◽  
Forced Draft Oven ◽  
Forced Draft ◽  
Dietary Treatments ◽  
Mg Content ◽  
Different Levels

An 8-week experiment was conducted to study the effect of added Natuphos® 5000 phytase in corn–soybean meal-based diets on laying hens fed different levels of crude protein (CP) (14 and 17%). Two levels of phytase enzyme were used: 0 and 600 Phytase Units (FTU)/kg feed. The experiment used 144 Hisex Brown laying hens in a 2 × 2 factorial design. Four treatments and three replicates per treatment with 12 hens per replicate were used. Egg production was recorded daily while egg weight was assessed on 13th and 14th day of each two-week period to calculate total egg mass. Total excreta were collected and approximately 10% of the amount was used for analysis after drying in a forced draft oven. The results showed no significant effect of added phytase on excreta Calcium (Ca) content, but significantly lower Magnesium (Mg) content was observed with phytase (3.54, 2.48, 3.13 and 2.75 % for hens fed 14% CP no phytase, 14% CP + phytase, 17% CP no phytase, and 17% CP + phytase, respectively). Added phytase also significantly decreased Mg excretion measured as grams/kg of egg mass (21.43, 12.47, 16.76 and 14.75 g/kg egg mass for hens of respective dietary treatments. Phytase had a strong effect on Zink (Zn) levels with 438.96, 369.17, 434.38 and 374.58 mg Zn/kg dry excreta of hens. Similar results were observed with Cu. Added phytase significantly reduced the excreta content and the excretion of Cu. The results of this experiment indicate that adding 600 FTU to laying hen diets containing 14% CP decreases the excretion of Mg, Zn and Cu without any adverse effects on the egg mass produced of laying hens.

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 The effect of raw soybeans in mixtures for laying hens on production performance and the relative weight of the pancreas

2014 ◽  
Vol 30 (1) ◽  
pp. 115-123
Author(s):  
V. Petricevic ◽  
M. Lukic ◽  
Z. Pavlovski ◽  
Z. Skrbic ◽  
Z. Jokic ◽  
...  
Keyword(s):  
Food Consumption ◽  
Egg Production ◽  
Laying Hens ◽  
Relative Weight ◽  
Production Performance ◽  
Heat Treated ◽  
Body Weights ◽  
Standard Level ◽  
Production Body ◽  
Different Levels

The study was conducted on Isa Brown hybrid hens at the age of 49-57 weeks. The effect of using different levels of share of raw soybean of two varieties in mixtures for feeding hens on egg production, body weight, food consumption, the occurrence of defective eggs, mortality and the relative weight of the pancreas was studied. The possibility of replacing the heat-treated soybean grains, varieties Lana, with reduced trypsin inhibitor (TI) and Lydia with a standard level of TI, with raw soybean grains was examined. The research was conducted on the principle of two factorial experiment 2 x 4 (2 varieties x 4 levels of share of raw grain in the mixture) with a total of 8 diet treatments and 4 replicates per each treatment. In the first 5 weeks of the study, the differences in the number of eggs produced under the influence of tested factors were not significant. Under the influence of soybean varieties, the level of share of raw soybean and interaction of the studied factors showed significant differences (p<0.01) after 53 week of age. The use of soy with lower TI in the diet for laying hens resulted in a significantly greater capacity compared to standard variety. The share of raw soybean grains of 8 % in the mixtures significantly reduced the number of eggs laid. The differences in body weights, food consumption, occurrence of defective eggs and the relative weight of the pancreas were not significantly influenced by the studied factors or by their interaction effect.

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 Threonine Requirements in Dietary Low Crude Protein for Laying Hens under High-Temperature Environmental Climate

Animals ◽  
2019 ◽  
Vol 9 (9) ◽  
pp. 586
Author(s):  
Mahmoud Mostafa Azzam ◽  
Rashed Alhotan ◽  
Abdulaziz Al-Abdullatif ◽  
Saud Al-Mufarrej ◽  
Mohammed Mabkhot ◽  
...  
Keyword(s):  
Uric Acid ◽  
Serum Uric Acid ◽  
Crude Protein ◽  
Egg Production ◽  
Laying Hens ◽  
Control Diet ◽  
Maximum Level ◽  
Control Group ◽  
Quadratic Trend ◽  
Coa Reductase

Lohmann Brown hens (n = 420), at 28 weeks of age, were divided into five dietary treatments, and each treatment included six replicates of 14 laying hens. Dietary crude protein (14%) was presented as the control diet. Dietary L-Thr was added to the control diet for 12 weeks. Dietary Thr levels are 0.43%, 0.49%, 0.57%, 0.66%, and 0.74%, based on digestible base. From 28 to 40 weeks, hen-day egg production presented a quadratic trend to supplementing dietary Thr (R2 = 0.96, p = 0.02), and reached a maximum level at 0.58%. Serum uric acid demonstrated a quadratic trend (R2 = 0.62, p = 0.02) at 0.59%. Both serum total cholesterol and 3-hydroxy-3-methylglutaryl (HMG-CoA) reductase showed lower levels (p < 0.05) at 0.66% Thr. Serum CuZn-SOD elevated (p < 0.05) at 0.49%, 0.57%, and 0.66% Thr, as compared to the control group, and showed a quadratic trend (R2 = 0.87, p = 0.003) at 0.56%. Supplemental L-Thr decreased (p < 0.05) the expression of ileal HSP70 at 0.66% Thr. In summary, the optimal dietary Thr requirements to optimize egg production, serum uric acid, and serum CuZn-SOD were 0.58%, 0.59%, and 0.56%, respectively, by regression analysis.

The performance of laying hens on diets using barley as the main energy source

1973 ◽  
Vol 13 (62) ◽  
pp. 251 ◽  
Author(s):  
EA Dunstan
Keyword(s):  
Energy Source ◽  
Protein Content ◽  
Crude Protein ◽  
Egg Production ◽  
Laying Hens ◽  
Metabolizable Energy ◽  
The Other ◽  
Crude Protein Content ◽  
Egg Weight ◽  
Equal Energy

An experiment compared egg production on a diet using a mixture of wheat, barley, and oats as the grain portion, with a diet in which the wheat and oats were replaced with barley. A comparison between sundried and dehydrated lucerne meal was included. A second experiment compared the same formulations of barley and mixed grain diets as used in the first experiment, and a mixed grain diet of higher crude protein content. Replacing wheat and oats with barley in an otherwise unchanged diet did not significantly affect the number of eggs produced but did increase the average egg weight by 1.1 g in both experiments, significantly so in one experiment, but not in the other. Increasing the crude protein content of the mixed grain diet did not significantly affect either egg production or egg weight. Consumption of the barley diet was greater than the mixed grain diets. This increase in consumption was less than would have been expected on the basis of equal energy intakes, indicating that the metabolizable energy value of the barley used was greater than values previously published for barley. No differences were found in performance between sundried and dehydrated lucerne meal.

Effect of different levels of dietary crude protein on the growth performance and carcass characteristics of commercial broilers at different phases of growth

2017 ◽  
Author(s):  
T. Srilatha ◽  
V. Ravinder Reddy ◽  
V. Chinni Preetam ◽  
S.V. Rama Rao ◽  
Y. Ramana Reddy
Keyword(s):  
Amino Acids ◽  
Growth Performance ◽  
Feed Efficiency ◽  
Crude Protein ◽  
Body Weight Gain ◽  
Carcass Characteristics ◽  
Abdominal Fat ◽  
Dietary Crude Protein ◽  
Low Levels ◽  
Different Levels

An experiment was conducted to find out the effect of different levels of crude protein in broiler diets during different phases. i.e., pre starter (0-11d), starter (12-21d) and finisher (22-42d). 360 day-old broilers (Vencobb) were procured from a commercial hatchery and fed either high or low dietary CP diets during pre-starter (23 and 21%) , starter (21 and 19%) and high, moderate or low CP diets during finisher ( 18.5, 17.5 and 16.5%) phases, for a total of 12 possible treatment combinations at d 42. The results showed that the broilers fed low levels of CP ( 21 and 19 %) had significantly(P less than 0.05) higher body weight gain (BWG) and feed intake (FI), and better feed efficiency over the diets with high levels of CP during pre-starter and starter phases (23 and 21%, respectively). The higher (18.5%) level of protein in the finisher phase showed higher BWG and best FCR compared to the lower levels (17.5 and 16.5%). Carcass characters were not influenced by the variation in dietary CP level tested except the abdominal fat weight which was significantly higher in broiler fed low CP diet compared to those fed higher levels of CP during all three phases. The results indicated that the broilers fed low CP diets supplemented with critical amino acids (21 and 19%) had beneficial effect on the growth performance during pre-starter and starter phase. The broilers showed an ability to respond to increase in dietary CP levels during finisher phase.

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