Effect of amino acid levels during broiler breeder pullet rearing on: 2. Egg weight and characteristics from 26 to 34 wk of age
Published: February 11, 2020
By: Yilmar Matta 1,2; Edgar Oviedo-Rondon 1, Andres Ortiz 1,2; Ivan Ospina 1, Hernan Cordova 1, Lina Penuela 1,2; Miguel Chico 1, Viviana San Martin 1, Justina Caldas 3. / 1 North Carolina State University; 2 Universidad del Tolima; 3 Cobb Vantress Inc.
Amino acid pullet nutrition affects growth and development and it is important to evaluate potential effects on egg traits. One experiment was conducted to determine the effects of four amino acid (AA) dietary levels fed to broiler breeder pullets during the rearing phase from 5 to 24wk of age on egg characteristics. A total of 1,360 Cobb-500 slow-feathering pullets were placed in 16 floor pens (85/pen). Up to 4wk all pullets were fed one starter diet in crumbles and after 29d of age fed with four mash grower diets containing 4 AA levels (0.40, 0.54, 0.60, and 0.66% of dLys with balanced protein) and 2,700 kcal/kg ME. From 16wk to 5% egg production, developer mash diets with 2,800 kcal/kg ME and 0.51, 0.57, 0.63, and 0.69% of dLys were offered. Feed amounts varied slightly (±3 g/d) among treatments in the developer phase to maintain BW close (±2%) to Cobb guideline. After 5% egg production all hens were fed one common layer diet and feed increments were made according to egg production by treatment. Onset of egg production occurred at 165d and reached 5% at 167d of age. Egg weights (30/pen) were evaluated after all treatments reached 50% egg production at 26, 28, 30, 32, and 34wk of age. Eggshell color, strength, and thickness were evaluated in 6 eggs/pen at 30wk. Egg components, albumen, yolk and eggshell percentages were calculated and Haugh units measured. Data was analyzed in a CRD with 4 AA treatments and 4 replicate pens each. One-way ANOVA and regression analyses were conducted. Results indicated that AA levels affected (P < 0.05) egg weight up to 28wk. Hens fed the highest AA level during rearing had eggs up to 2 grams heavier than hens fed the lowest AA level and the other treatments were intermediate. There was a linear effect (P < 0.01) of AA levels on egg weight up to 28wk. However, no effects (P > 0.05) of dietary treatments during rearing on egg weight were detected at 30, 32 and 34wk. No effects (P > 0.05) on eggshell color, thickness, yolk color or egg components were observed. Eggshell strength and elasticity (P < 0.05) of hens fed the highest AA level during rearing was lower (37.9N) than eggs from hens fed the two lowest AA levels (42.5N). In conclusion, AA dietary levels during rearing affected initial egg weight and eggshell strength.
Key Words: amino acids, pullet breeders, egg weight, eggshell strength.
Abstract presented at the International Poultry Scientific Forum 2019 in Atlanta, USA.
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12 de septiembre de 2020
Mr Edgar, I can only make a few considerations that I think are pertinent in the matter I have access to. I think, regardless of whether it is a complete material or summary, the information and conclusions must be consistent. Now, if the matter was published by ENGORMIX, without containing the information as published, I think that this fact was not quite the case, you, mistakenly, made your considerations to me. Think about it. Anyway, I would like to point out that what I wrote about your subject was a personal view, without pretending not to admit any other interpretation of what was presented. Therefore, Mr. Edgar, our considerations should always be about the technical aspect of the presented matter, maintaining the good level of the discussion, which is a norm in this FORUM DEBATE.
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15 de febrero de 2020
Dr. Edgar, considering the proposed treatments, it did not seem clear to me, how the treatments were implemented from 16 weeks up to 5% of egg production. As the level of lysine in a breeding period can influence the subsequent period, it seems important to me to define the criteria used in the distribution of birds in the treatments in this second evaluation phase. Was it flat? That is, birds that received 0.40% lysine in the first evaluation period received the treatment corresponding to 0.51% in the second period, and so on, or not? The conclusions are not consistent with the title and objectives of the study.
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14 de septiembre de 2020
My 42 weeks old layers egg production drop by 20% suddenly, I have dewormed and treated with antibiotic it keeps dropping.
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11 de septiembre de 2020
Recently I bought some feed for my birds.
I mean layers but the feed is just like powder.
What do you think have wrong with the feed?
What ingredients you think is missing in the feed?
Because what I experienced with the birdstv are as follows:
1. Egg was small
2 Egg was dropping both size and quantity
3. The was not brown instead is white in colour.
Please I need a solution sir.
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