scholarly journals Effect of Dietary Supplemental Levels of Vitamin A on the Egg Production and Immune Responses of Heat-Stressed Laying Hens

2002 ◽  
Vol 81 (4) ◽  
pp. 458-465 ◽  
Author(s):  
H. Lin ◽  
L.F. Wang ◽  
J.L. Song ◽  
Y.M. Xie ◽  
Q.M. Yang
Keyword(s):  
Vitamin A ◽  
Immune Responses ◽  
Egg Production ◽  
Laying Hens

scholarly journals Effects of dietary levels of vitamin A on the egg yield and immune responses of laying hens

1998 ◽  
Vol 77 (4) ◽  
pp. 542-546 ◽  
Author(s):  
B Coskun ◽  
F Inal ◽  
I Celik ◽  
O Erganis ◽  
AM Tiftik ◽  
...  
Keyword(s):  
Vitamin A ◽  
Immune Responses ◽  
Laying Hens

scholarly journals Effects of supplementing various linoleic to α-linolenic acid ratios and vitamin A on production performance and egg characteristics of laying hens during summer months

2019 ◽  
Vol 1 (1) ◽  
Author(s):  
Muhammad Naeem Tahir
Keyword(s):  
Body Weight ◽  
Weight Gain ◽  
Vitamin A ◽  
Linolenic Acid ◽  
Feed Intake ◽  
Egg Production ◽  
Laying Hens ◽  
Body Weight Gain ◽  
Production Performance ◽  
Dietary Treatments

In the present feeding trial, responses of laying hens, kept at high ambient temperature, to various dietary ratios of linoleic acid (LNA) to α-linolenic acid (ALA) and vitamin A levels on performance and egg characteristics were evaluated. A total of 360, 40-wk-old, Leghorn laying hens were fed on diets with various combinations of canola oil and linseed oil to achieve LNA to ALA dietary ratios of 20:1, 10:1, 4:1, 2:1, 1:1 and 1:2, each supplemented with 3000 IU or 10000 IU vitamin A/kg of diet. The diets were fed in a 6×2 factorial Completely Randomized Design that continued for 12 weeks. Feed intake, weight gain, egg production and egg quality traits were recorded during the trial. Decreasing dietary LNA to ALA ratio in the diet affected negatively (P<0.05) on body weight gain and yolk percentage in laying hens. While, feed intake, hen-day and hen-housed egg production, feed conversion ratio (FCR) per dozen of eggs and shell quality remained unaffected (P>0.05) by dietary treatments, with the exception of FCR per kg eggs, egg weight and egg-shell thickness which responded significantly (P<0.05) to various dietary treatments. Although the dietary ratio of LNA to ALA of 4:1 or less could produce eggs by the hens with desirable quantities of n-6 and n-3 poly unsaturated fatty acids – that are characteristics of functional diets – the performance of laying hens in terms of body weight gain and egg-yolk percentage was slightly compromised.

scholarly journals LOCAL PEPPERS AS SOURCES OF VITAMIN A AND COLOUR IN THE EGG YOLK

2021 ◽  
Vol 4 (1) ◽  
pp. 123-132
Author(s):  
B. K. Ogunmodede ◽  
A. A. Eyo
Keyword(s):  
Vitamin A ◽  
Egg Production ◽  
Laying Hens ◽  
Egg Yolk ◽  
Capsicum Annum

Two varieties of peppers, Capsicum frutescence and Capsicum annum were included in rations for laying hens at 2%, 4% and 6% levels. Egg production was not affected by these levels of the peppers but larger egg sizes were obtained. The annum produced more carotene in the egg yolk than the frutescence. Similar results were obtained for the yolk vitamin A. Corresponding levels of the two peppers produced similar colours in the egg yolk and the dark-yolked eggs preferred by many consumers can be obtained with 4% and 6% levels of either peppers.

scholarly journals Changes in the Percentages of B- and T-Lymphocytes and Antibody Titres in Laying Hens Infested with Dermanyssus gallinae—A Preliminary Study

Animals ◽  
2020 ◽  
Vol 10 (6) ◽  
pp. 987
Author(s):  
Sylwia Koziatek-Sadłowska ◽  
Rajmund Sokół
Keyword(s):  
T Cells ◽  
B Cells ◽  
Immune Responses ◽  
Egg Production ◽  
Laying Hens ◽  
Economic Losses ◽  
Dermanyssus Gallinae ◽  
Th Cells ◽  
Post Vaccination ◽  
Antibody Titres

(1) Background: Dermanyssus gallinae, a hematophagous ectoparasite, adversely affects the health status of laying hens, leading to reduced egg production and significant economic losses in commercial farms. The aim of this study was to determine the effect of D. gallinae on the development of post-vaccination immune responses in layer hens. (2) Methods: A total of 80 blood samples were collected at four time-points (B1–B4) from 10 Hy-Line Brown hens, randomly selected from a commercial layer farm. The flock was naturally infested with D. gallinae and treated twice with Biobeck PA 910 (AI silicon dioxide). The samples were collected before and after each treatment. The percentages of IgM+ B cells, CD3+/CD4+ T cells and CD3+/CD8a+ T cells were determined by flow cytometry; the titres of antibodies against avian encephalomyelitis, infectious bronchitis virus, Newcastle disease virus, Ornithobacterium rhinotracheale, reticuloendotheliosis virus and avian reovirus were determined by the immunoenzymatic method. (3) Results: The percentage of Th cells and post-vaccination anti-IBV and anti-NDV antibodies decreased significantly at the second infestation peak when the number of parasites was twice higher than at the first infestation peak. Non-significant negative correlations were found between the number of mites and the percentage of B cells (R = −0.845, p > 0.05) and between the number of mites and the percentage of Th cells (R = −0.522, p > 0.05), and a significant positive correlation was noted between the number of mites and the percentage of Tc cells (R = −0.982, p < 0.05). There were non-significant correlations between the number of mites and antibody titres. (4) Conclusion: The present findings suggested that D. gallinae might inhibit immune responses since the percentages of B cells and Th cells were negatively correlated with the number of mites. The percentage of Tc cells was positively correlated with the number of mites, which indicated that D. gallinae could stimulate cellular immune responses in infested laying hens. However, further research is needed to determine whether D. gallinae suppresses the production of vaccine-induced antibodies.

scholarly journals The influence of vitamins in the feed of laying hens on the quality of the chickens.

1958 ◽  
Vol 6 (2) ◽  
pp. 89-93
Author(s):  
N. Zwiep ◽  
T.J. De Man
Keyword(s):  
Vitamin D ◽  
Vitamin A ◽  
Egg Production ◽  
Laying Hens ◽  
Total Weight ◽  
Group Number

The effect of adding a supplement of vitamins A and D to a diet for laying hens which was known to be adequate for egg production was studied. The diet for one group of birds was supplemented with 1875 I. U. vitamin A and 375 I. U. vitamin D per kg. ; three times these amounts were added to the diet of another group. Number and total weight of eggs, production percentage, i. e. number of eggs as a percentage of number of birds, and hatchability of eggs did not differ significantly between the groups. Fertility was slightly higher with the larger supplements. Quality of chicks was estimated by comparing their behaviour when they were deprived of vitamin A or vitamin D or both. When vitamin D was lacking chicks from the more liberally supplemented group of hens fared best. When deprived only of vitamin A chicks from both groups fared equally well.-J. G. Gordon. (Abstract retrieved from CAB Abstracts by CABI’s permission)

scholarly journals Correlation of Egg Production with Vitamin A, Ascorbic Acid, Mineral Reserves and Body Weight of Laying Hens

1940 ◽  
Vol 19 (6) ◽  
pp. 435-442 ◽  
Author(s):  
Arthur D. Holmes ◽  
Francis Tripp ◽  
G. Howard Satterfield
Keyword(s):  
Ascorbic Acid ◽  
Body Weight ◽  
Vitamin A ◽  
Egg Production ◽  
Laying Hens ◽  
Mineral Reserves

ПРЕРЫВИСТОЕ ОСВЕЩЕНИЕ ПОВЫШАЕТ ЭФФЕКТИВНОСТЬ ИСКУССТВЕННОГО ОСЕМЕНЕНИЯ КУР В КЛЕТКАХ

2019 ◽  
Keyword(s):  
Reproductive Performance ◽  
Artificial Insemination ◽  
Egg Production ◽  
Laying Hens ◽  
Electric Energy ◽  
Productive Performance ◽  
Feed Conversion ◽  
Scientific Center ◽  
Academy Of Sciences ◽  
Egg Fertility

Intermittent Lighting Improves the Efficiency of Artificial Insemination in Cage Housed Laying Hens Kavtarashvili A.Sh., Kolokolnikova T.N. Federal Scientific Center “All-Russian Research and Technological Poultry Institute” of Russian Academy of Sciences Omsk Agrarian Scientific Center Summary: The effects of different lighting regimes on the oviposition schedule, productive performance, and reproductive efficiency in cage housed laying hens of layer parental flock (Hisex White-R) were studied; the reasonable regime of artificial insemination (AI) under intermittent lighting is proposed. It was found that intermittent lighting regime 1L:4D:4L:1D:4L:10D compared to the constant lighting significantly alters oviposition schedule: under this regime 82.3% of all daily eggs were laid until 9 am (vs. 66.6% in control). This regime and AI at 10 am improved the productive and reproductive performance compared to control (constant lighting 16L:8D and AI at 12 am): mortality by 1.9%, egg production per initial hen by 3.8%, egg weight by 1.1%, percentage of eggs suitable for incubation by 1.9%, egg fertility by 0.9%, hatchability by 2.3%, hatch of chicks by 2.9%, feed conversion ratio (kg of feed per 10 eggs) by 5.3%, the expenses of electric energy for lighting (per 1000 eggs suitable for incubation) by 54.5%. Key words: INTERMITTENT LIGHTING, CAGE HOUSED LAYERS, ARTIFICIAL INSEMINATION (AI), OVIPOSITION SCHEDULE, AI TIMING, PRODUCTIVE PERFORMANCE, REPRODUCTIVE PERFORMANCE

scholarly journals Effects of Dietary Inclusion of Dry Hydrastis canadensis on Laying Performance, Egg Quality, Serum Biochemical Parameters and Cecal Microbiota in Laying Hens

Animals ◽  
2021 ◽  
Vol 11 (5) ◽  
pp. 1381
Author(s):  
Tzuen-Rong J Tzeng ◽  
Tzu-Yu Liu ◽  
Chiao-Wei Lin ◽  
Pei-En Chang ◽  
Pei-Xin Liao ◽  
...  
Keyword(s):  
Biochemical Parameters ◽  
Egg Production ◽  
Laying Hens ◽  
Basal Diet ◽  
Response To Treatment ◽  
Control Group ◽  
Hydrastis Canadensis ◽  
Laying Performance ◽  
Cecal Microbiota ◽  
Dietary Treatments

Alternative growth promoters are able to not only effectively replace the traditional use of antibiotics but also provide additional health benefits for livestock and reduce food safety concerns. This study investigated the effects of dry Hydrastis canadensis on the laying performance and fecal microbial community of laying hens. Twenty-four Lohmann (LSL, white layer strain) hens were reared from 40 to 48 weeks of age and randomly allotted to four dietary treatments (six birds/treatment). The dietary treatments comprised a basal diet with no treatment as control, a basal diet plus 0.6% powder of dry Hydrastis canadensis roots (R) or leaves (L), and a basal diet plus 0.6% powder of a mixture of dry Hydrastis canadensis roots and leaves (1:1, LR). No mortality was observed in the whole experimental period. The results indicated that albumen height in the LR group was significantly greater than that in the control group. The diet supplemented with Hydrastis canadensis had no significant effects on egg production rate, egg weight, eggshell strength, eggshell thickness, Haugh unit, or yolk height during the whole experimental phase. However, principal coordinate analysis, comparative heat map analysis, and cluster dendrogram analysis of cecal microbiota showed distinct clusters among the groups treated with Hydrastis canadensis and the control group. Regarding blood biochemical parameters, serum cholesterol levels were significantly lower in all Hydrastis canadensis-treated groups compared with those in the control group. Moreover, serum low-density lipoprotein levels were lower in hens supplemented with the leaf of Hydrastis canadensis. The abundances of the phyla Fusobacteria and Kiritimatiellaeota were increased (p < 0.05) in laying hens fed with 0.6% Hydrastis canadensis leaves, whereas the abundance of the phylum Firmicutes in cecum digesta decreased in response to treatment with Hydrastis canadensis roots and leaves. The relative abundance of the Fusobacterium genus was higher in the LR group compared with that in the control. On the contrary, we found a different trend in the Synergistes genus. The potential influences of these microbiota on the performance of laying hens were discussed. The results demonstrate that Hydrastis canadensis can improve the egg albumen height and modulate the cecum digesta microbiota composition of laying hens.

scholarly journals Effects of Bacillus subtilis on Production Performance, Bone Physiological Property, and Hematology Indexes in Laying Hens

Animals ◽  
2021 ◽  
Vol 11 (7) ◽  
pp. 2041
Author(s):  
Xinyu Zou ◽  
Sha Jiang ◽  
Mi Zhang ◽  
Haiqiang Hu ◽  
Xiaoling Wu ◽  
...  
Keyword(s):  
Bacillus Subtilis ◽  
Egg Production ◽  
Laying Hens ◽  
Maximum Load ◽  
Physiological Property ◽  
Production Performance ◽  
Feed Additive ◽  
Basic Diet ◽  
Bone Damage ◽  
Diet Control

This study was to investigate the effects of Bacillus subtilis on production performance and bone pathophysiological characteristics of layers. Twenty-four 48-week-old Lohmann Pink-shell laying hens were randomly divided into two groups: a basic diet (control) and the basic diet mixed with Bacillus subtilis (0.5 g/kg) for a 60-day trial. Statistically, independent-sample t-test was used to assess the treatment differences. The results showed that Bacillus subtilis supplementation improved the percent of marketable eggs (p < 0.05) with reduced numbers of broken and soft-shelled eggs but had no effects on egg weight, height of albumen, yolk color, and Haugh unit (p > 0.05). Bacillus subtilis supplement also elevated maximum load (p = 0.06), maximum stress (p = 0.01), stiffness (p < 0.01), and Young’s modulus (p < 0.01) but suppressed maximum strain (p = 0.06) in the femur. In addition, compared with control birds, phosphorous concentration (p < 0.01) was reduced in serum at day 61 but increased in the femur (p < 0.05) in Bacillus subtilis fed birds. Bacillus subtilis fed birds also had lower magnesium concentrations in both femur (p = 0.04) and feces (p = 0.09). Furthermore, Bacillus subtilis increased plasma estrogen concentration (p = 0.01) and femur TNF receptor superfamily member 11b (OPG) expression (p < 0.05) but reduced plasma IL-1 (p < 0.01) and TNF-α (p < 0.01) concentrations. These results indicate that Bacillus subtilis could be used as a health promotor to reduce overproduction-induced inflammation and associated bone damage and to increase marketable egg production. The data provide evidence for developing a management strategy to use Bacillus subtilis as a feed additive to improve marketable egg production and health and welfare status of laying hens.

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