Poster Biochemistry SEM 2

Coarse Corn Particles cause Negative effect on Eggshell Quality of Semi-Heavy Laying Hens

by: Vanessa R.M. Oliveira,Alex M.V. Arruda, Aurora S. Melo, Davyd H. Souza , Joao B.F. Souza-Junior, Raimunda T.V. Fernandes, Joao P.A.F. Queiroz

Introduction

Discussion

The main causes of low productive performance of animals of economic interest is the thermal stress condition. In this sense, one of the possible ways to optimize the productivity of poultry is through physical processing of ingredients. In recent years, the interest is increasing in the effects of dietary factors on poultry production. Then, studies on the effects of different particle sizes of diet ingredients on egg quality and productive performance show contradictory results. The lack of uniformity in these results may be associated with factors such as physicochemical characteristics of the ingredients management, age and health status. of the birds.

Materials & Methods

In the present, yolk pigmentation was higher in the fine corn particles, while it was lower for hens fed coarse particles. The results of hens fed medium particles were statistically similar to those of hens fed the other diets. The smaller corn particle size possibly increased surface contact with intestinal enzymes and carriers, which favored enterohepatic absorption of carotenoids for ovary and egg yolk pigmentation,

1. Experimental Location
2. Diets and Experimental design
3. Performance and Qualitative

analysis of eggs

Result

The effects of different corn particle sizes on the laying rate, egg weight, egg number, egg mass, feed intake, and feed conversion during the experimental.

Conclusion

It is suggested that semi-heavy laying hens should be fed mash diets containing corn particles with a GMD from 605 to 1,030 mm, because coarse corn particle causes negative effect on eggshell quality. Thicker eggshells are more desirable because they decrease the chances of breaking during transportation and marketing, preventing economic losses for all links in the poultry production chain.

Problem Statement

The effect of different corn particle sizes on egg quality are shown in Table .

-Studied how to evaluate the effects of different corn particle sizes in diets on the productive performance and egg quality of semi-heavy laying Hens?

-Studied about particulate matter that occurs on Hens eggshells

Group Members

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1. The experiment Environmental variables were measured during the trial period, The wind speed (m/s) and air temperature (C) was measured with a precision anemometer , Relative humidity (%) were measured using a digital thermohygrometer .

Experimental location

2. In total, 60 laying hens at 24 weeks of age were selected and distributed in individual galvanized wire cages with feeders and nipple drinkers for 10 weeks. The hens were selected based on uniformity in body weight and laying rate and were assigned to the various treatments in a completely. No artificial lighting program or were used throughout the experimental period. The ventilation, air temperature and humidity inside the shed were controlled by the opening (07:00) and closed (17:00) of lateral curtains. The hens were housed from the 24th- 34th weeks of age. Average weights of the hens at the beginning and end of the experiment were 4,150 and 3,980 g, respectively. The treatment groups were fed diets containing corn particles of different sizes. The corn was processed in a hammer mill with sieves, and the sieves are with diameters of 2, 4, and 8 mm. The GMD of the grain particles were measured with a granulometer The corn particles fed to hens had a GMD of 605 (fine), 1,030 (medium), or 2,280 mm (coarse). for the nutritional requirements of semi-heavy laying hens based on the medium production of egg mass (Table 2), with feed (140 g/bird) supplied twice per day at 07:00 and 16:00, and water provided ad libitum.

Diets and Experimental design

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All eggs produced on 3 consecutive days each week were individually weighed and examined to assess their quality. The egg quality analysis was based on yolk weight (g), albumen weight (g), shell weight (g), shell thickness (mm), and yolk color

Ingredients and nutritional composition of feed for semi-heavy laying hens (%)

Ingredients ContentCorn 62.00 Soybean meal 27.00 Limestone 8.00 Dicalcium 2.00 Salt 0.40 Vitamin supplement1 0.30 Mineral supplement2 0.30 Nutrient levels Dry matter 87.90 Calcium 3.65 Available phosphorus 0.67 Ethereal extract 2.69 Neutral detergent fiber 11.30 Acid detergent fiber 4.39 Crude protein 17.40 Apparent metabolizable energy, kcal/kg 2,674.0

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RESULTS

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Egg quality of semi-heavy laying hens fed different corn particle sizes.

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ͣ, ᵇ with in a row, means with different letters indicate a significant difference (Turkey’s test, P < 0.05).

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DISCUSSION

Thereby enabling more efficient zeacarotene absorption. Eggshell quality (weight and thickness) was significantly affected (P < 0.05) by corn particle size. The highest values were found in the medium corn particle size, which differed from the coarse, but both did not differ from the fine. Medium corn particles size allows a slow passage of food through the digestive tract, thereby improving the physical activity in the gizzard and intestinal absorption to provide good synchronization and availability of carbonate calcium for eggshell calcification in the oviduct

In the present study, calcium absorption was favored by the effect of corn particle size on the digestive tract that coarser granulometry influences gastrointestinal function and development, as well as the microstructure of the intestinal epithelium. These factors would be closely associated with digestibility. Contrasting results regarding egg quality were that different corn and limestone particle sizes do not influence eggshell quality, respectively

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GROUP 3

MUHAMMAD YUSRI BIN MD SHAFI’I SBL (F20B0476) FARHANAH SAFWANAH BINTI SHUKUR SBL(F20A0662) WAHIDAH BINTI RAMLI SBL (F20A0638) NUR AFIFAH BINTI RATFI SBL (F20B0507)