scholarly journals Calculation and Evaluation of Energy: Amino Acid Ratios for the Egg-Production Type Hen

1984 ◽  
Vol 63 (9) ◽  
pp. 1810-1822 ◽  
Author(s):  
P.J. SLAGTER ◽  
P.W. WALDROUP
Keyword(s):  
Amino Acid ◽  
Egg Production ◽  
Production Type

scholarly journals Evaluation of the Sulfur Amino Acid Requirements of Commercial Egg Production Type Pullets

1967 ◽  
Vol 46 (1) ◽  
pp. 181-186 ◽  
Author(s):  
R.H. Harms ◽  
B.L. Damron ◽  
P.W. Waldroup
Keyword(s):  
Amino Acid ◽  
Egg Production ◽  
Sulfur Amino Acid ◽  
Production Type ◽  
Amino Acid Requirements

Target of Rapamycin drives unequal responses to essential amino acid depletion in egg laying

2021 ◽  
Author(s):  
André Nogueira Alves ◽  
Carla M Sgrò ◽  
Matthew D Piper ◽  
Christen K Mirth
Keyword(s):  
Amino Acids ◽  
Amino Acid ◽  
Egg Production ◽  
Essential Amino Acids ◽  
Egg Laying ◽  
Drop Out ◽  
Single Amino Acid ◽  
Amino Acid Depletion ◽  
Holidic Diet ◽  
Related Trait

Nutrition shapes a broad range of life history traits, ultimately impacting animal fitness. A key fitness-related trait, female fecundity is well known to change as a function of diet. In particular, the availability of dietary protein is one of the main drivers of egg production, and in the absence of essential amino acids egg laying declines. However, it is unclear whether all essential amino acids have the same impact on phenotypes like fecundity. Using a holidic diet, we fed adult female D. melanogaster diets that contain all necessary nutrients except one of the 10 essential amino acids and assessed the effects on egg production. For most essential amino acids, depleting a single amino acid induced as rapid a decline in egg production as when there were no amino acids in the diet. However, when either methionine or histidine were excluded from the diet, egg production declined more slowly. Next, we tested whether GCN2 and TOR were involved in this difference in response across amino acids. While mutations in GCN2 did not eliminate the differences in the rates of decline in egg laying among amino acid drop-out diets, we found that inhibiting TOR signalling caused egg laying to decline rapidly for all drop-out diets. TOR signalling does this by regulating the yolk-forming stages of egg chamber development. Our results suggest that amino acids differ in their ability to induce signalling via the TOR pathway. This is important because if phenotypes differ in sensitivity to individual amino acids, this generates the potential for mismatches between the output of a pathway and the animal's true nutritional status.

Economies in the use of animal by-products in poultry rations: II. Vitamin and amino-acid provision for laying hens

1954 ◽  
Vol 44 (3) ◽  
pp. 340-354 ◽  
Author(s):  
K. J. Carpenter ◽  
J. Duckworth ◽  
G. M. Ellinger
Keyword(s):  
Amino Acid ◽  
Egg Production ◽  
Laying Hens ◽  
Early Growth ◽  
Limited Access ◽  
Protein Factor ◽  
Laying Performance ◽  
Final Weight ◽  
By Products ◽  
Stimulation Of

1. Birds fed on rations devoid of animal byproducts from hatching until 18 months of age were equal in laying performance and health to those that had received animal supplements.2. The stimulation of early growth by feeding aureomycin did not affect the final weight of pullets, their egg production or the incidence of broodiness.3. The ‘animal protein factor(s)’ was of limited importance for egg production. There was a suggestive indication of an effect of a deficiency of the factor(s) when birds on an all-plant ration had been laying for 6 months without access to their droppings. Limited access to ‘unfermented’ droppings, which provided the only dietary source of the factor(s) during both rearing and laying periods, was sufficient to meet the need of the birds for sustained egg production.

scholarly journals The Effect of Feeding Restriction on the Microbiota and Metabolome Response in Late-Phase Laying Hens

Animals ◽  
2021 ◽  
Vol 11 (11) ◽  
pp. 3043
Author(s):  
Clara Ajeng Artdita ◽  
Yi-Ru Zhuang ◽  
Tzu-Yu Liu ◽  
Chih-Yuan Cheng ◽  
Felix Shih-Hsiang Hsiao ◽  
...  
Keyword(s):  
Amino Acid ◽  
Egg Production ◽  
Pathogenic Bacteria ◽  
Laying Hens ◽  
Late Phase ◽  
Serum Metabolites ◽  
Microbiome Composition ◽  
Egg Production Rate ◽  
Acid Pathway ◽  
Effect Of Feeding

This study investigated cecal bacterial community profile, cecal and serum metabolites, and its biosynthesis pathway in late-phase laying hens during 6 weeks feeding restriction (FR), using 16S rDNA as gene sequencing and non-targeted LC-MS/MS as metabolomics approach. We used three groups (ad libitum, FR20, and FR40). FR can reduce excessive fat in late-phase laying hens, while egg production rate is not affected, except for the FR40 group. In phylum level, FR20 had more population of Bacteriodetes and Firmicutes amongst groups. The same result is at genus level, FR20 were higher of the predominant genus (Bacteroides and Rikenellaceae_RC9_gut_group). Both of FR20 and FR40 reduced Proteobacteria as potential pathogenic bacteria. Non-targeted metabolomic analysis revealed that FR20 modified 20 metabolites in cecal and 10 metabolites in serum of laying hens, whereas 48 cecal metabolites and 31 serum metabolites has revealed in FR40. KEGG assay showed FR20 and FR40 upregulated lipid, carbohydrate, amino acid, nucleic acid pathway, and FR40 modified steroid metabolism in cecal analysis. In serum, only FR40 modified lipid, amino acid pathway, and carbohydrate biosynthesis were shown. This study showed that FR during late-phase laying hens altered the microbiome composition, modified metabolites profile and biosynthesis of the cecal as well as serum.

scholarly journals COMPARATIVE INVESTIGATION OF EGG PRODUCTION IN WG, GG AND GL JAPANESE QUAIL POPULATIONS

2018 ◽  
Vol 16 (4) ◽  
pp. 334-343 ◽  
Author(s):  
H. Lukanov ◽  
A. Genchev ◽  
P. Kolev
Keyword(s):  
Japanese Quail ◽  
Egg Production ◽  
Comparative Investigation ◽  
Production Traits ◽  
Feed Conversion ◽  
Egg Weight ◽  
Production Type ◽  
Poultry Breeding

The aim of the study was to evaluate egg production in three heavy Japanese quail populations created and reared in the Poultry Breeding Unit of the Trakia University – Bulgaria, marked as WG, GG and GL. In the experiments, 160 female birds from populations WG and GG, and 96 female birds from population GL were tested up to the 6th production month. The main egg production traits were controlled. The highest egg production for the period was demonstrated in group GL (79.84±4.46%), followed by group GG (76.33±3.40%) and group WG (72.11±4.16%). Quails from the WG group were outlined with least efficient feed conversion per egg (74.49±1.21 g feed), while those from the GL group: with the most efficient one – 64.93±1.41 g (p<0.01). The highest average egg weight in descending order was observed in the WG group (14.04±0.32 g), GG group (13.65±0.27 g) and GL group (12.79±0.29 g). The Japanese quail populations created and maintained at the Trakia University showed a potentially good egg production for the production type they belonged to, which makes them attractive for use in interline hybridisation schedules, including for production of autosexing stock layers.

Sign in / Sign up

Export Citation Format

Share Document