Reproductive soundness is higher in chickens selected for low as compared with high antibody response

Albrecht, H. N.; Siegel, P. B.; Pierson, F. W.; McGilliard, M.L.; Lewis, Ronald M.

doi:10.3382/ps.2012-02169

Cited by 8 publications

(11 citation statements)

References 22 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Mean hatchability ranged from 65% (farm group 2) to 76% (farm group 7) while egg production ranged from 21-24 predicted eggs/hen/cycle. These hatchability values compare well with results from other authors investigating this characteristic among indigenous chicken (Albrecht, 2011;Abiola et al, 2008;Asuquo, et al, 1992). The farm group 7 with the lowest flock size trends had production values close to those of other groups.…”

Section: Journal Of Agricultural Studiessupporting

confidence: 81%

Evaluating Characteristics of Indigenous Chicken System with Flock Size Trends in a Participatory Research on Improved Management Practices in Kenya

Ndegwa

Norrish

Shepherd

et al. 2015

JAS

View full text Add to dashboard Cite

This study investigates characteristics of indigenous chicken farms categorised on flock size patterns identified in a research involving 200 farmers in five regions in three counties (Nyandarua, Laikipia, Nakuru) in Kenya. Four villages were selected per region and10 farms in each village. Training and sensitisation meetings, introduction of intervention options (Housing, Feed Supplementation, Vaccination and Deworming), implementation by farmers, and monitoring and evaluation were carried out. The farmers used own inputs in implementing the project interventions and recorded various project activities and outputs. The project was monitored over a span of five, 3-months long periods. Variation analysis was used to identify similarities and differences between 7 farm categories (groups) based on their differences on the levels of the following factors: (1) Average farm flock sizes at five different periods (2) Treatment characteristics (interventions) application -(housing, vaccination, de-worming, and supplementation) (3) Demography characteristics (total flock additions, total flock reductions, total unplanned reductions and total controlled reduction) and (4) Production characteristics (mean hatchability and egg production per hen per cycle based on predicted egg production). Results indicate there were significant differences between the groups. Almost all the flock size differences between farm groups were significant at 1 percent level. There was a rise in differences of the between and within groups mean squares from period 1 to 5 as a result of the flock sizes levels also increasing with period. The treatment characteristics application levels had little differences between groups but housing and feed supplementation had larger values than the other two characteristics. The treatments application differences not being significant could be a consequence of influence from the research team being more or less the same in all the farms. The demography characteristics, total addition and total reduction values were close to one another among the farm categories. These together with flock size levels had little influence from the research team but were mostly a reflection of individual farm's decision and activities. However, the production characteristics reflected more both the farmer's action and the hen potential. The group with the lowest flock size trends had production values close to those of other groups. This would suggest that low flock size level in a farm is not a reflection of poor production dynamics. The demographic characteristics differences between farms compare well with significant levels on flock size differences between farms shown earlier, especially the total additions, total reductions and total controlled reductions. There was no single significant difference among the groups on vaccination and production characteristics -mean hatchability and egg production. Production characteristics may have been more influenced by hen factors, which may not have been different among the d...

show abstract

Section: Journal Of Agricultural Studiessupporting

confidence: 81%

Evaluating Characteristics of Indigenous Chicken System with Flock Size Trends in a Participatory Research on Improved Management Practices in Kenya

Ndegwa

Norrish

Shepherd

et al. 2015

JAS

View full text Add to dashboard Cite

show abstract

“…This was also observed in a different selection experiment for SRBC antibody response: the high SRBC antibody response line laid their eggs later than the low response line (Albrecht et al, 2012b;Zhao et al, 2012). In addition, the low antibody response line showed to have a longer duration of fertility than the high antibody response line (Albrecht et al, 2012b). Martin et al (1990) found a realized genetic correlation between age at sexual maturity and antibody response to SRBC of -0.28 in a line selected for low antibody response.…”

supporting

confidence: 52%

“…Contradictory, previous studies described that hens selected for a high primary antibody response to SRBC after 29 generations laid their first egg 23 d later than hens selected for low primary specific antibody response to SRBC (Parmentier et al, 2012). This was also observed in a different selection experiment for SRBC antibody response: the high SRBC antibody response line laid their eggs later than the low response line (Albrecht et al, 2012b;Zhao et al, 2012). In addition, the low antibody response line showed to have a longer duration of fertility than the high antibody response line (Albrecht et al, 2012b).…”

mentioning

confidence: 67%

Selective breeding on natural antibodies in chickens

Berghof¹

View full text Add to dashboard Cite

9 (i.e. total KLH-binding NAb titers) will result in similar responses of the other NAb (iso)types. The GWAS were performed with 57,636 single nucleotide polymorphisms (SNP) for total KLH-binding NAb titers, and for the isotypes IgM, IgA, and IgG on 1,628 white purebred laying chickens of the same line as the base population. One genomic region was significantly associated to KLH-binding IgM NAb titers, and to a lesser extent to total KLH-binding NAb titers. The region showed full dominance, and had a major effect on IgM. This region is located on chromosome 4, and contained two Toll-like receptors (TLR). To further characterize the found association, total antibody concentration, and antibody concentrations of the isotypes IgM, IgA, and IgG were measured as well, and GWAS were performed. One genomic region, the same as identified before, was significantly associated to IgM antibody concentration. Full sequence data of key ancestors of the study population allowed imputation to full genome sequence for further association: 16 candidate genes were identified. SNP located in coding regions of these candidate genes were checked for predicted changes in protein functioning. One SNP, a C/G polymorphism at 69,965,939 base pairs (Gallus_gallus-5.0), received the maximum impact score from two independent prediction tools, which makes this SNP the most likely causal variant. The C-variant had an allele frequency of 0.45, showed a dominant mode of gene action, and was associated with high IgM levels. The G-variant had an allele frequency of 0.55, and was associated with low IgM levels. This SNP is located in TLR1A, which suggests a fundamental role of TLR1A on regulation of IgM levels, or B cells, or both.

show abstract

“…Data on the regularities of the weight and shell thickness changes in eggs from L + and L  published by A. Martin et al [60] and H. Albrecht et al [64] are contradictory. Probably, the reasons are the unequal duration of selection (22 and 36 generations respectively) and the differences between the genotypes of initial populations.…”

Section: Features Of Embryogenesis In Meat Hens Genotypes With Differmentioning

confidence: 99%

“…Egg laying in L  was proved to start 11.67±3.53 days earlier and layers had a lower body weight (169.46±40.20 g) than in L + as a result of selection in 36 generations of White Leghorn hens for antibody response [63,64]. At this, egg parameters were significantly greater in L + (shape index by 4.12±0.55 %, egg white height by 0.27±0.12 mm and egg white quality in Haugh units by 1.89±0.91 %).…”

Section: Features Of Embryogenesis In Meat Hens Genotypes With Differmentioning

confidence: 99%

REPRODUCTIVE FUNCTION IN HYBRID POULTRY. II. AN IMPACT OF BREEDING FOR TRAITS OTHER THAN PRODUCTIVITY (review)

Zabudskii¹

2015

S-h. biol.

View full text Add to dashboard Cite

Herein, the data are summarized on the impact of such selection criteria as poultry cannibalism, ascites resistance, stress responsiveness, and primary immune response to reproductive function in poultry. The selection for one of these signs changes the productivity and other body functions. High-productive meat crosses differ from slow-growing chicks in a susceptibility to ascites (R. Wideman, 2001). Broilers' mortality because of ascites makes 5-10 %, and at the lowered temperature of the environment can reach 50 % calculated from world production (H. Pavlidis et al., 2007). Prerequisites to development of the disorder are formed during embryogenesis (E. Decuypere еt al., 2000). In the embryos who are the descendants of ascite resistant poultry (L ), a relative heart weight is reliable higher, and pipping shells and a hatching occur earlier, than in L + genotype lines for which the hypothyroidism and tachycardia are characteristic (D. Luger et al., 2002). An observed increase in egg incubation period in L + lines can be caused by lower activity of thyroid gland and an increased pCO 2 in egg air camera, and as a result, the embryos suffered from hypoxia. A positive correlation is revealed between the development of lungs and the thyroid gland activity during embryogenesis, i.e. the lungs volume is the larger the higher thyroidal hormone rate, and vice versa (M. Hassanzadeh et al., 2008). In the chickens with better developed lungs, grown up under chronic hypoxia, the mortality from ascites was reliably lower. In L + and L  broilers the mortality was 93.2 and 9.0 %, respectively (S. Druyan, 2009). The heart beating in L + and L  1-day chickens differed, being on average 435 and 404 beats per minute, respectively, but to the day 17 the difference practically leveled (419 and 417 beats per minute, respectively) due to a decreased rate in L + and an increased rate in L . Divergent selection for the feather pecking behavior causes differentiation in reactivity of the neuro-endocrine and immune systems (A. Buitenhuis, 2006). There are the evidences that the optimized incubation protocols for meat hens can prevent broiler chicks from ascites and improve safety of the poultry. Feather pecking reduced in the course of selected is associated with improvements in egg production (number and weight of eggs), but the deterioration in the quality of hatching eggs, the results of incubation, the state of derived chickens and changes of stress responsiveness and(or) immune response. So, the feather pecking rate was reliable lower in L  than in L + poultry, and the number and weight of eggs laid during a month are higher (i.e. 0.38 and 2.01 feather pecking per hour, 1223 and 1132 g, 24.4 and 18.3 eggs, respectively). However, the egg quality in L + hens was better compared to L  , with the Haugh units of 73.0 and 64.9, shell thickness of 38.1 and 37.0 mm, and yolk ration of 30.6 and 29.5 %, respectively (G. Su, 2006). Selection for humoral immune response causes the metabolic changes and influences on the synthesis of prote...

show abstract

Reproductive soundness is higher in chickens selected for low as compared with high antibody response

Cited by 8 publications

References 22 publications

Evaluating Characteristics of Indigenous Chicken System with Flock Size Trends in a Participatory Research on Improved Management Practices in Kenya

Evaluating Characteristics of Indigenous Chicken System with Flock Size Trends in a Participatory Research on Improved Management Practices in Kenya

Selective breeding on natural antibodies in chickens

REPRODUCTIVE FUNCTION IN HYBRID POULTRY. II. AN IMPACT OF BREEDING FOR TRAITS OTHER THAN PRODUCTIVITY (review)

Contact Info

Product

Resources

About