Assessment of Normal Mortalities, Biosecurity and Welfare of Lohmann Brown Layers at a Farm in Central Namibia

Samkange, Alaster; Mushonga, Borden; Kandiwa, Erick; Kambode, Josephina Ndamonako; Mbiri, Pricilla; Gorejena, Brighton; Madzingira, Oscar

doi:10.3923/ijps.2020.503.512

Cited by 5 publications

(4 citation statements)

References 31 publications

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“…The average mortality rate was 12.19%. This agrees with the report of Samkange et al (2020) [18], which revealed 18.7% average mortality in Namibia. Ideally, according to literature and expert opinions, the mortality rate of poultry farmers should not exceed 10%.…”

Section: Housing Management Practices Of Farmerssupporting

confidence: 93%

Exploring Small-Scale Broiler Farming Practices and Vaccine Adherence: A Study in Aguata, Nigeria

Attamah,

Ezeibe,

Okoronkwo

2023

SciMed. J.

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The study ascertained the production practices of small-scale broiler farmers in Aguata Local Government Area of Anambra State, Nigeria. A multistage sampling procedure was adopted for the random selection of 80 farmers using a structured interview schedule. The data were analysed using descriptive statistics. The result reveals that 87.5% of the farmers adopted a deep litter housing system, and 98.75% ensured their poultry houses were sited in well-drained soil and properly ventilated pens. About 93% and 98% of the farmers had brooding and finishing houses separately on their farms and ensured adequate lighting and heat in their brooding houses, respectively. The result shows that 100% and 93.75% of the respondents administered antibiotics and multivitamins at the early stage of day-old chicks and adhered to the Gumboro and Lasota vaccine schedules, respectively, while only 1.25% of the farmers provided a footbath at the entry of their poultry house. All the farmers used broiler starters and finishers in feeding their birds, and the mean weekly duration of broiler starter and finisher feeding was 4.09 and 4.28 weeks, respectively, while 98.75% ensured to always provide water for their birds. The study concluded that the use of recommended production practices was high to some extent among farmers. Hence, the level of information on broiler production practices should be increased by the government extension service unit to enable farmers to keep abreast of current and necessary information on broiler production. Doi: 10.28991/SciMedJ-2023-05-01-03 Full Text: PDF

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Section: Housing Management Practices Of Farmerssupporting

confidence: 93%

Exploring Small-Scale Broiler Farming Practices and Vaccine Adherence: A Study in Aguata, Nigeria

Attamah,

Ezeibe,

Okoronkwo

2023

SciMed. J.

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“…This mortality rate is classified as high, revealed that the standard for raising laying hens, the maximum recommended mortality is only 3% of the total population. [14] stated that the contribution of the sub-optimal biosecurity practices and welfare standards to mortalities on the farm could have been the major underlying factor, especially considering that the birds were not housed in environmentally controlled facilities. The findings of a cost-benefit analysis of biosecurity measures taken at a typical laying farm with respect to hygiene, seclusion, and movement regulation.…”

Section: Data Analysis Techniquementioning

confidence: 99%

“…The impact of disease on farmers can range from a decline in laying hen productivity to the advent of both localized and widespread mortality. According to [14], 0.8-1.5% mortality rates are considered acceptable for laying hens by international breeders (Hy-line, Dekalb, and Lohmann). Some studies claim that if the mortality rate is higher than 5%, then the business will lose money.…”

Section: Relationship Between Biosecurity and Mortalitymentioning

confidence: 99%

The Effect of Biosecurity Implementation on Mortality in Layer Chicken Farming

Mirwandhono,

Miranti,

sari

et al. 2023

IOP Conf. Ser.: Earth Environ. Sci.

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Biosecurity is an effort to prevent and control livestock from disease. This study aims to determine the implementation of biosecurity on mortality in the laying hen farming in the Selesai District. Research design was explanatory quantitative. The sample in this study were 55 laying hens farmers. Data collection was carried out through interviews and questionnaires. Data analysis in this study was descriptive statistics using frequency distribution tables, multiple linear regression analysis, and statistical induction inference using Spearman’s rank correlation. Isolation, sanitation, and traffic control on the farm represent the biosecurity measures that were observed. The results of this study indicate that the implementation of biosecurity was in the poor category with an average weight value of 154.3. The variables (sanitation, isolation, and traffic control) simultaneously have an influence on the mortality variable. The implementation of biosecurity and mortality is interpreted as having a positive and unidirectional relationship.

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“…A strong negative correlation has been found between natural death during rearing and rearing success. According to Samkange et al (2020), natural death in Lohmann Brown layers reared for 12 months from day of placement in the barn onward, contributed to mortality up to 31.6% compared to culls caused by inflammatory conditions (20.9%), trauma (19.3%), cannibalism (16.6%), or retained eggs (11.8%) [8]. A study that was done in a tropical climate showed, mortality of layer breeders (over 78 weeks of age) is less during rearing compared to younger breeders, three times more for the age category 39-58 weeks and 90 times more for the age category 19-38 weeks [9].…”

Section: Introductionmentioning

confidence: 99%

A two-step Bayesian network approach to identify key SNPs associated to multiple phenotypic traits in four purebred laying hen lines

Bouba,

A. Videla Rodriguez,

Smith

et al. 2024

PLoS ONE

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When purebred laying hen chicks hatch, they remain at a rearing farm until approximately 17 weeks of age, after which they are transferred to a laying farm. Chicks or pullets are removed from the flocks during these 17 weeks if they display any rearing abnormality. The aim of this study was to investigate associations between single nucleotide polymorphisms (SNPs) and rearing success of 4 purebred White Leghorns layer lines by implementing a Bayesian network approach. Phenotypic traits and SNPs of four purebred genetic White Leghorn layer lines were available for 23,000 rearing batches obtained between 2010 and 2020. Associations between incubation traits (clutch size, embryo mortality), rearing traits (genetic line, first week mortality, rearing abnormalities, natural death, rearing success, pullet flock age, and season) and SNPs were analyzed, using a two-step Bayesian Network (BN) approach. Furthermore, the SNPs were connected to their corresponding genes, which were further explored in bioinformatics databases. BN analysis revealed a total of 28 SNPs associated with some of the traits: ten SNPs were associated with clutch size, another 10 with rearing abnormalities, a single SNP with natural death, and seven SNPs with first week mortality. Exploration via bioinformatics databases showed that one of the SNPs (ENAH) had a protein predicted network composed of 11 other proteins. The major hub of this SNP was CDC42 protein, which has a role in egg production and reproduction. The results highlight the power of BNs in knowledge discovery and how their application in complex biological systems can help getting a deeper understanding of functionality underlying genetic variation of rearing success in laying hens. Improved welfare and production might result from the identified SNPs. Selecting for these SNPs through breeding could reduce stress and increase livability during rearing.

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Assessment of Normal Mortalities, Biosecurity and Welfare of Lohmann Brown Layers at a Farm in Central Namibia

Cited by 5 publications

References 31 publications

Exploring Small-Scale Broiler Farming Practices and Vaccine Adherence: A Study in Aguata, Nigeria

Exploring Small-Scale Broiler Farming Practices and Vaccine Adherence: A Study in Aguata, Nigeria

The Effect of Biosecurity Implementation on Mortality in Layer Chicken Farming

A two-step Bayesian network approach to identify key SNPs associated to multiple phenotypic traits in four purebred laying hen lines

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