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Results for “egg quality”

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At least 19 recordsLinked to original sources
PubMed1977

Incorporation of sodium bicarbonate into laying rations. II. Effects on egg quality.

The replacement of 0.67% NaCl in the ration by 1% NaHCO3 leads to improvements of several parameters of the shell quality and some other egg quality characteristics in the Rhode Island Red breed. In the Fayoumi breed this influence was not clearly discernible. This also holds for an increase of the NaHCO3 content in the ration to 2%. Under the conditions in the AR Egypt the addition of 1-2% NaHCO3 for the Rhode Island Red is recommended in order to improve the shell quality and the internal quality of the eggs.

Animal Feed↗
PubMed1990

Effectiveness of ascorbic acid and chromium in counteracting the negative effects of dietary vanadium on interior egg quality.

Four experiments were conducted to investigate further the effects of V on hen performance and egg quality as well as on the ability of ascorbic acid and Cr to counteract the deleterious effects of V on interior egg quality. At 10 ppm, added V significantly reduced albumin quality as measured by Haugh units; and at 30 ppm and 100 ppm, respectively, significantly reduced rate of lay and feed consumption and also increased body weight loss. As measured by shell breaking strength or shell thickness, shell quality was not affected significantly by V (added to a maximum of 100 ppm). Ascorbic acid (100 to 5,000 ppm) effectively protected the hens from the reduction in albumen quality resulting from the addition of 10 ppm of V to the basal diet. Hen performance and egg quality were not significantly affected by adding 10 or 50 ppm of Cr to a diet with 10 ppm of added V, nor by adding 30 or 150 ppm of Cr to a diet with 30 ppm of added V. The added Cr failed to counteract the depressing effects of V on the Haugh units recorded, regardless of the composition of the basal diet.

Analysis of Variance↗
PubMed1986

Egg quality and hen performance responses to protein-calcium deficiency, cafeteria feeding, and cage density.

Single Comb White Leghorn (SCWL) hens were given feeds (2975 kcal ME/kg) that were marginally deficient in protein (15%) and calcium (3.0%). Negative control was as a mash, whereas an experimental mixture had the same formulation, but 5 of the 15% protein was soybean pellets in place of the meal and 2 of the 3% calcium was oyster shell flakes. A complete cafeteria system acted as a positive control and provided pellets, oyster shell, and a 10% protein-1% calcium mash (2975 kcal ME/kg) separately in a three-compartment trough. Feed treatments were imposed from 24 to 40 weeks of age on hens kept one and two/cage. Performance effects, because of the feed treatments, were not apparent until after 8 weeks of experimentation. Production was sustained by the pellet-oyster shell feed mixture when birds given the complete mash declined. Feeds had immediate effects on egg quality. Egg shell deformation and albumen Haugh values were highest with the complete mash and lowest for the cafeteria system, while the complete mixture was generally between these extremes. Hens kept two/cage consumed more feed than those one/cage and responded similarly to each treatment, but the reduced performance associated with increased density was not alleviated.

Albumins↗
PubMed1990

Effect of 1 alpha,25-dihydroxycholecalciferol on egg shell quality and egg production.

1. The effect of replacing dietary cholecalciferol (D3) by 1 alpha,25-dihydroxycholecalciferol (1,25-(OH)2D3) on egg shell quality and egg production was tested on 32-week-old White Leghorn laying hens over 9 weeks. 2. Hens fed on a diet supplemented with 5 micrograms 1,25-(OH)2D3/kg diet, tended to lay more eggs, and the eggs had significantly higher specific gravity and percentage shell than eggs from control hens fed on a diet supplemented with 27.5 micrograms D3/kg diet. 3. The effect became apparent after about 4 weeks of treatment and persisted until the end of the test. 4. Hens fed on a diet without D3 supplement started to lay very thin or soft shelled eggs within 4 weeks, suggesting that the birds' reserves of D3 or its metabolites were depleted within this period. 5. The results suggest that 1,25-(OH)2D3 can be substituted for D3 in layer diets to improve egg shell quality.

Animals↗
PubMed1990

Production and egg-quality responses of White Leghorn layers to anticoccidial agents.

Two studies were conducted to determine the effects of anticoccidial agents on the production and reproduction of White Leghorns. In Experiment 1, nicarbazin (NCZ) was fed at 0, 20, 50, and 100 ppm. Hen-day egg production, egg weight, the egg-yolk DNC (4-4'-dinitrocarbanilide) level, and egg-yolk mottling were affected by the treatments. When response was evidenced, the relationship between those variables and the level of NCZ was basically linear. Decreased egg production occurred from Days 5 and 6 of the treatment through Days 1 and 2 of withdrawal. On Days 9 and 10 of treatment, the control hens peaked at 92% hen-day production, while hens fed 20, 50, and 100 ppm of NCZ peaked late--at 90, 82, and 80%, respectively. Compared to the controls, egg weight was reduced linearly as the level of dietary NCZ increased. The egg-yolk DNC level increased from Days 3 and 4 of treatment through Days 9 and 10 of withdrawal. Egg yolk mottling generally increased along with the level and duration of feeding NCZ. If the NCZ was mistakenly fed to White Leghorn layers, ill effects would be alleviated within 10 days after drug withdrawal. In Experiment 2, halofuginone (3 ppm), maduramicin (5 ppm), monensin (100 ppm), narasin (70 ppm), nicarbazin (125 ppm), robenidine (33 ppm), and salinomycin (60 ppm) were fed to White Leghorn hens at the levels specified in parentheses. Nicarbazin reduced egg production, depressed egg weight, reduced shell thickness, and caused egg-yolk mottling; but internal egg quality, as measured by Haugh Units, was unaffected. Halofuginone, maduramicin, monensin, narasin, robenidine, and salinomycin did not have a meaningful effect on the variables measured when fed to White Leghorn layers.

Animal Feed↗
PubMed1984

Effect of dietary phosphorus level and source on productive performance and egg quality of two commercial strains of laying hens.

An experiment was conducted to study the influence of dietary total phosphorus (TP) level and source on the performance of two strains of commercial layers for two consecutive production years (26 to 68 and 76 to 116 weeks of age, respectively). Diet 1 contained .4% TP; Diets 2, 3 and 4 contained .5, .6, and .7% TP with supplemental P from dicalcium phosphate (DCP); Diets 5 and 6 contained .5 and .6% TP, respectively, with supplemental P from a sample of raw rock phosphate (RRP-1); Diets 7 and 8 contained .5 and .6% TP, respectively, with supplemental P from a second sample of raw rock phosphate (RRP-2). Calcium level was 2.75% in all diets, and crushed oyster shell provided ad libitum to all birds increased the total calcium to about 3.00%. Diet 1 was inferior to the average of all supplemented diets relative to feed consumption rate (P less than .005) and egg weight (P less than .005) during the first year. Diet 1 was also inferior relative to egg production rate (P less than .01), feed consumption rate (P less than .005), and egg weight (P less than .005) during the second year, whereas it was superior in shell quality (P less than .05) during the first year. Increasing TP from DCP resulted in a significant linear increase in feed consumption (P less than .05), feed conversion ratio, and Haugh units (P less than .005). Increasing TP from DCP also resulted in a significant linear decrease in shell quality (P less than .05) and significant linear and quadratic decreases in egg weight (P less than .005) during the first year. During the second year, increasing TP from DCP resulted in a significant linear decrease in egg production rate (P less than .005) and feed efficiency but significant linear (P less than .01) and quadratic (P less than .05) increases in feed consumption, and significant linear and quadratic increases (P less than .005) in Haugh units. Hens receiving RRP diets responded differently during the first and second years. The DCP supported greater egg weight than the RRP during the second year and permitted better feed conversion during both years. Strain A produced larger eggs than Strain B regardless of treatment (P less than .005). When egg production rate and most other response criteria were considered, .5% TP with DCP as the supplemental source gave the best results in both production years. A TP of .6% from RRP-2 gave similar results in both years.

Animals↗
PubMed1990

Study on effects of feeding laying hens on separate mycotoxins (aflatoxins, patulin, or citrinin)-contaminated diets on the egg quality and tissue constituents.

Four groups (each of 8 laying hens plus one cock) were offered commercial laying mash contaminated with 100 ppb of aflatoxins, citrinin, patulin or uncontaminated (control) for 6 weeks. The mycotoxin-contaminated diets led to some significant changes in egg characteristics and composition such as ash and calcium contents of the egg shell. The noticeable changes including also the relative weights of adrenal glands. Blood profile reflected too alterations (P greater than 0.05) in urea content and activity of both glutamic oxaloacetic transaminase and alkaline phosphatase as well. The mycotoxins affected significantly moisture and fat contents of the red muscle and protein content, texture and percentage of lean meat in both types of muscles (red and white). Patulin toxicosis was responsible for the strongest alterations in moisture, fat and vitamin A contents of the laying hen's liver and for the lowest calcium content of egg shell besides the shape alteration of the eggs. Laying hens fed on aflatoxin-contaminated diet produced hatched chicks with higher weight (P less than or equal to 0.05) than those from the controls. Citrinin residues were 10 ppb in the fresh muscles and egg yolk and 6 ppb in egg white.

Aflatoxins↗