scholarly journals The Livability of Bovans Brown Parent Layers Raised in Commercial Breeder Farm, Ethiopia

2021 ◽  
Vol 9 (2) ◽  
pp. 33
Author(s):  
Berhanu Abera ◽  
Kasim Kediro ◽  
Mohamed Jafer ◽  
Shihun Shimelis ◽  
Abdulbari Ismael ◽  
...  
Keyword(s):  
Commercial Breeder

Valuing DNA marker tested bulls for commercial beef production

2004 ◽  
Vol 55 (8) ◽  
pp. 825 ◽  
Author(s):  
B. J. Wood ◽  
J. H. J. van der Werf ◽  
P. F. Parnell
Keyword(s):  
Gene Flow ◽  
Allele Frequency ◽  
Gene Frequency ◽  
Dna Marker ◽  
Recessive Gene ◽  
Single Recessive Gene ◽  
Beef Herd ◽  
Thyroglobulin Gene ◽  
Commercial Breeder ◽  
Over Time

This paper quantifies the benefits of using a sire genotyped for a single recessive gene in a commercial beef herd. A modified gene-flow method was used to account for changing allele frequency over time. The benefits to a commercial breeder of using a genotyped sire were highest when initial allele frequency was moderate and when the sire was used in a self-replacing herd that had increased allele frequency over time. An example of the thyroglobulin gene affecting marbling in beef cattle was used. The value to a self-replacing herd of a sire homozygous for the favourable allele of the thyroglobulin gene was shown to be up to $338 more than of an ungenotyped sire, in a population where the initial gene frequency was 0.3 and the genotype accounted for 0.5 standard deviations of phenotypic variation.

scholarly journals Maternal age and maternal environment affect stress reactivity and measures of social behaviour in laying hens

2021 ◽  
Author(s):  
Mariana R. L. V. Peixoto ◽  
Leanne Cooley ◽  
Tina M. Widowski
Keyword(s):  
Stress Response ◽  
Maternal Effects ◽  
Social Stress ◽  
Maternal Age ◽  
Stress Reactivity ◽  
Laying Hens ◽  
Maternal Environment ◽  
Positive Effects ◽  
The Subject ◽  
Commercial Breeder

Abstract Maternal effects can shape the phenotypes of offspring, but the extent to which a layer breeder’s experience can affect commercial laying hens remains unclear. We aimed to investigate the effects of maternal age and maternal environment on laying hens' behaviour and stress response. In our first experiment (E1), commercial hybrid hens were reared either in aviary or barren brooding cages, then housed in aviary, conventional cages or furnished (enriched) cages, thus forming different maternal housing treatments. Hens from each treatment were inseminated at three ages, and measures of response to manual restraint and social stress were assessed in offspring. In experiment 2 (E2), maternal age effects on offspring's stress response were further investigated using fertile eggs from commercial breeder flocks at three ages. In E1, maternal age affected struggling and corticosterone during manual restraint, feather pecking and pulling and comb wounds. Additionally, maternal rearing and housing in aviary systems showed positive effects on measures of behaviour and stress response in offspring. Effects of maternal age were not replicated in E2, possibly due to methodological differences or higher tolerance to maternal effects in commercial breeders. Overall, we recommend researchers start reporting parent stock's age to increase our understanding of the subject.

scholarly journals Molecular Detection of Infectious Bronchitis Virus Isolated from Commercial Breeder Farms in Chittagong District, Bangladesh

2016 ◽  
Vol 4 (7) ◽  
pp. 370-375 ◽  
Author(s):  
Md. Inkeyas Uddin ◽  
Md. Shafiqul Islam ◽  
Tofazzal Md. Rakib ◽  
Shubhagata Das ◽  
Paritosh Kumar Biswas ◽  
...  
Keyword(s):  
Infectious Bronchitis Virus ◽  
Molecular Detection ◽  
Infectious Bronchitis ◽  
Commercial Breeder

scholarly journals Molecular identification of Mycoplasma synoviae from seroprevalent commercial breeder farms at Chittagong district, Bangladesh

2016 ◽  
Vol 9 (10) ◽  
pp. 1063-1069 ◽  
Author(s):  
Md. Inkeyas Uddin ◽  
Md. Harisul Abid ◽  
Md. Shafiqul Islam ◽  
Tofazzal Md. Rakib ◽  
Ashim Baran Sen ◽  
...  
Keyword(s):  
Molecular Identification ◽  
Mycoplasma Synoviae ◽  
Commercial Breeder

scholarly journals The effect of a selected yeast fraction on the prevention of pullorum disease and fowl typhoid in commercial breeder chickens

2020 ◽  
Vol 99 (1) ◽  
pp. 101-110
Author(s):  
Chenyu Zhou ◽  
Jingzhen Liang ◽  
Weiwei Jiang ◽  
Xushao He ◽  
Shuhong Liu ◽  
...  
Keyword(s):  
Fowl Typhoid ◽  
Commercial Breeder

Avian Leukosis Virus in Hatchable Eggs of Commercial and Free-Range Chickens

2021 ◽  
Vol 35 (2) ◽  
pp. 28-30
Author(s):  
O.O. Oni ◽  
E.B. Oluwayinka ◽  
N. Bankole ◽  
T. Aroyehun
Keyword(s):  
Malignant Neoplasm ◽  
Avian Leukosis Virus ◽  
Economic Losses ◽  
Enzyme Linked Immunosorbent Assay ◽  
Indigenous Chicken ◽  
Free Range ◽  
Indigenous Chickens ◽  
Elisa Technique ◽  
Commercial Breeder ◽  
Apparently Healthy

Avian leukosis is caused by various avian retroviruses which induce a variety of benign and malignant neoplasm in chickens with subsequent economic losses to the poultry industry. A survey of avian leukosis in hatchable eggs of apparently healthy chickens was carried out in an attempt to determine the prevalence of avian leukosis virus (ALV) in exotic breeders and free-range indigenous chickens in Oyo state. A total of 188 (76 exotic breeders and 112 free-range chickens) albumen of hatchable eggs were obtained from 3 different commercial breeder farms and 12 free-range indigenous chicken farms. Eggs were tested by an antigen capture enzyme-linked immunosorbent assay (ELISA) technique. Eleven out of the 76 albumen obtained from eggs of exotic breeders tested positive to ALV antigen which represents 14.5% while 37 of the 112 albumen from free-range indigenous eggs were confirmed as positive representing 33%. Overall prevalence rate of 25% was recorded for all eggs sampled with the highest prevalence of ALV antigen detected in free-range indigenous chickens than the exotic chickens. The results emphasizes the control of the Avian Leukosis transmission by including both exotic and free-range indigenous birds as wells as the use of ALV free eggs in hatcheries

Editorial

2000 ◽  
Vol 51 (6) ◽  
pp. I
Author(s):  
Jenny Fegent ◽  
Saumitra Banerjee
Keyword(s):  
Feed Intake ◽  
Egg Production ◽  
Fold Increase ◽  
Egg Mass ◽  
Protein Levels ◽  
High Rise ◽  
Lysine Concentration ◽  
Egg Shell ◽  
Grower Diet ◽  
Commercial Breeder

IsaBrown pullets were obtained from a commercial breeder at 15 (Expt 1) and 16 (Expt 2) weeks of age and housed in either single-bird or multiple 5-bird cages in a high rise, windowless layer house in which temperatures were maintained below 30˚C by computerised control of fans and evaporative cooling pads. In Expt 1, they were fed either a grower diet or a pre-layer diet consisting of the grower diet containing additional calcium to 18 weeks of age and then maintained during lay to 56 weeks of age on diets containing either 160 or 180 g crude protein (CP)/kg. In Expt 2, they were fed the grower diet to 19 weeks of age and then 1 of 5 diets similar in all ingredients except that the lysine concentration varied between 7.35 and 8.95 g/kg in increments of 0.4 g/kg. The L-lysine HCl supplements were added in lieu of solka floc, an inert cellulose supplement. In Expt 1, mortality was low (2.25%), peak egg production was high (95–98%), and the mean rate of lay at 56 weeks of age was above 88%. The diet fed prior to lay had no significant effect on production during lay. Feed intake and egg production were similar for hens fed both dietary protein levels during lay, and egg weight and egg mass output were greater for hens fed the diet containing 180 g CP/kg. Hens in multiple-bird cages ate significantlyless feed for a significantly smaller daily egg mass output. In Expt 2, increasing the dietary lysine concentration significantly reduced feed intake and significantly increased lysine intake, egg shell breaking strength, and albumen height. Multiple-caged hens had a significantly lower hen-housed egg production as a result of a 7-fold increase in mortality compared with hens in single cages, due mainly to cannibalism. The daily lysine requirement formaximum egg production approximated 940 mg for hens in single cages and 975 mg for hens in multiple-bird cages.

Lesions Produced by a New Lungworm in Beagle Dogs

1973 ◽  
Vol 10 (5) ◽  
pp. 385-407 ◽  
Author(s):  
R. S. Hirth ◽  
G. H. Hottendorf
Keyword(s):  
New Species ◽  
Preliminary Evidence ◽  
Postmortem Examination ◽  
Beagle Dogs ◽  
Granulomatous Reaction ◽  
Drug Induced ◽  
Neoplastic Lesions ◽  
Pulmonary Changes ◽  
A New Species ◽  
Commercial Breeder

An enzootic lungworm infection caused by a nematode not previously found in the dog, and probably representing a new species in the Filaroides-Metathelazia group, was found during postmortem examination of Beagle dogs purchased from a commercial breeder. Abnormal respiratory signs were not present, and clinicopathologic tests did not aid in the antemortem detection of infected dogs. Lungworms were present only in alveoli and terminal and respiratory bronchioles. In the majority of dogs there was a focal, granulomatous reaction directed against the adult lungworm, but a remarkably broad spectrum of other pulmonary changes was also seen, including some that mimic drug-induced and neoplastic lesions. Preliminary evidence suggests this lungworm may be present in a number of kennels that breed Beagles for use in research.

scholarly journals Tich: a mutant causing disproportional growth in the mouse

1991 ◽  
Vol 57 (1) ◽  
pp. 29-35 ◽  
Author(s):  
James R. Archer ◽  
Victoria A. Archer ◽  
Michael F. W. Festing ◽  
Mirian A. Ghiraldini
Keyword(s):  
Inbred Mice ◽  
Spontaneous Mutation ◽  
Normal Weight ◽  
Gene Symbol ◽  
Chromosome 7 ◽  
Recessive Mutation ◽  
Long Bones ◽  
Weak Linkage ◽  
Commercial Breeder

SummaryA spontaneous mutation ‘tich’ (gene symbol tch) appeared as a recessive mutation in inbred mice of strain A. TL. Homozygotes are rather dumpy mice of approximately normal weight but with short limbs and tail. Skeletal measurements on backcross siblings show that the mandible bones are almost normal but long bones and some parts of the pelvic and pectoral girdles are short. Although tich resembles brachypodism phenotypically it is not linked to agouti, and does not match the description of any other skeletal mutation. There was some evidence for weak linkage with albinism on chromosome 7. The mutation has reappeared amongst the A. TL mice of a UK commercial breeder and may have been accepted as the norm for A. TL amongst some European users of this mouse.

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