scholarly journals Farmers preferences towards breeding objective for indigenous chickens in different agro-ecologies of Ethiopia

2020 ◽  
Vol 16 (12) ◽  
pp. 1681-1690
Author(s):  
Bekele Berhanu ◽  
Melesse Aberra ◽  
Banerjee Sandip ◽  
Esatu Wondmeneh ◽  
Dessie Tadelle
Keyword(s):  
Indigenous Chickens ◽  
Breeding Objective

scholarly journals Comparison of two live-animal ultrasound systems for genetic evaluation of carcass traits in Angus cattle

2021 ◽  
Author(s):  
C J Duff ◽  
J H J van der Werf ◽  
P F Parnell ◽  
S A Clark
Keyword(s):  
Carcass Traits ◽  
Genetic Correlations ◽  
Subcutaneous Fat ◽  
Genetic Evaluation ◽  
Ultrasound Scan ◽  
Ultrasound Scanning ◽  
Eye Muscle ◽  
Angus Cattle ◽  
Breeding Objective ◽  
Two Systems

Abstract The improvement of carcass traits is an important breeding objective in beef cattle breeding programs. The most common way of selecting for improvement in carcass traits is via indirect selection using ultrasound scanning of selection candidates which are submitted to genetic evaluation programs. Two systems used to analyse ultrasound images to predict carcass traits are the Pie Medical Esaote Aquila (PIE) and Central Ultrasound Processing (CUP). This study compared the ability of the two systems to predict carcass traits for genetic evaluation in Australian Angus cattle. Genetic and phenotypic parameters were estimated using data from 1648 Angus steers which were ultrasound scanned twice with both systems, first at feedlot entry and then following 100 days in the feedlot. The traits interpreted from ultrasound scanning included eye muscle area (EMA), rib fat (RIB) rump fat (RUMP) and intramuscular fat (IMF). Abattoir carcass data were collected on all steers following the full feedlot feeding period of 285 days. For all ultrasound scan traits, CUP resulted in higher phenotypic and genetic variances compared to the PIE. For IMF, CUP had higher heritability at feedlot intake (0.51 for CUP compared to 0.37 for PIE) and after 100 days feeding (0.54 for CUP compared to 0.45 PIE). CUP predicted IMF also tended to have stronger correlations with the breeding objective traits of carcass IMF marbling traits, both genetically (ranging from 0.59 to 0.75 for CUP compared to 0.45 to 0.63 for PIE) and phenotypically (ranging from 0.27 to 0.43 for CUP compared to 0.19 to 0.28 for PIE). Ultrasound scan EMA were the only group of traits in which the heritabilities were higher for PIE (0.52 for PIE compared to 0.40 for CUP at feedlot intake and 0.46 for PIE compared to 0.43 for CUP at 100 days of feeding), however with similar relationships to the breeding objective carcass EMA observed. For subcutaneous fat traits of ultrasound RIB and RUMP, the heritabilites and genetic correlations to the related carcass traits were similar, with the exception being the higher heritability observed for CUP predicted RUMP at feedlot intake at 0.52 compared to 0.38 for PIE. The results from this study indicates that the CUP system, compared to PIE, provides an advantage for genetic evaluation of carcass traits in Angus cattle, particularly for the IMF and associated marbling traits.

Chemical Composition of Scavenging Feed Resource of Indigenous Chickens

2016 ◽  
Vol 10 (3) ◽  
pp. 182-188 ◽  
Author(s):  
N. Hayat ◽  
D. Solomon ◽  
M. Meseret
Keyword(s):  
Chemical Composition ◽  
Indigenous Chickens

scholarly journals Pattern recognition receptor genes expression profiling in indigenous chickens of India and White Leghorn

2017 ◽  
Vol 96 (9) ◽  
pp. 3052-3057 ◽  
Author(s):  
S. Haunshi ◽  
Arun Kumar Burramsetty ◽  
T.R. Kannaki ◽  
K. S. Raja Ravindra ◽  
R.N. Chatterjee
Keyword(s):  
Pattern Recognition ◽  
Expression Profiling ◽  
Pattern Recognition Receptor ◽  
White Leghorn ◽  
Indigenous Chickens ◽  
Genes Expression ◽  
Genes Expression Profiling ◽  
Recognition Receptor

scholarly journals Characterization of subgroup J avian Leukosis virus isolated from Chinese indigenous chickens

2018 ◽  
Vol 15 (1) ◽  
Author(s):  
Fanfeng Meng ◽  
Qiuchen Li ◽  
Yawen Zhang ◽  
Zhihui Zhang ◽  
Sibao Tian ◽  
...  
Keyword(s):  
Avian Leukosis Virus ◽  
Indigenous Chickens ◽  
Subgroup J

scholarly journals Claw health and feed efficiency as new selection criteria in the Czech Holstein cattle Krupová Z., Wolfová M., Krupa E., Přibyl J., Zavadilová L.

2018 ◽  
Vol 63 (No. 10) ◽  
pp. 408-418 ◽  
Author(s):  
Z. Krupová ◽  
M. Wolfová ◽  
E. Krupa ◽  
J. Přibyl ◽  
L. Zavadilová
Keyword(s):  
Feed Intake ◽  
Feed Efficiency ◽  
Disease Incidence ◽  
Selection Index ◽  
Residual Feed Intake ◽  
Selection Response ◽  
Holstein Cattle ◽  
Breeding Objective ◽  
Economic Weights ◽  
The Impact

The objective of this study was to calculate economic weights for ten current breeding objective traits and for four new traits characterising claw health and feed efficiency in Czech Holstein cattle and to investigate the impact of different selection indices on the genetic responses for these traits. Economic weights were estimated using a bio-economic model, while applying actual (2017) and predicted (2025) production and economic circumstances. For the actual situation, the economic weights of claw disease incidence were –100.1 € per case, and those of daily residual feed intake in cows, breeding heifers, and fattened animals were –79.37, –37.16, and –6.33 €/kg dry matter intake per day, respectively. In the predicted situation, the marginal economic weights for claw disease and feed efficiency traits increased on average by 38% and 20%, respectively. The new traits, claw disease incidence and daily residual feed intake, were gradually added to the 17 current Holstein selection index traits to improve the new traits. Constructing a comprehensive index with 21 traits and applying the general principles of the selection index theory, a favourable annual genetic selection response was obtained for the new traits (–0.008 cases of claw disease incidence and –0.006 kg of daily residual feed intake across all cattle categories), keeping the annual selection response of the most important current breeding objective traits at a satisfactory level (e.g., 73 kg of milk yield per lactation, 0.016% of milk fat). Claw health and feed efficiency should be defined as new breeding objectives and new selection index traits of local dairy population.

scholarly journals Mitochondrial genetic diversity and maternal origin of Guangdong indigenous chickens

2018 ◽  
Vol 26 (3) ◽  
pp. 238-247
Author(s):  
Xunhe Huang ◽  
◽  
Zheqi Yu ◽  
Zhuoxian Weng ◽  
Danlin He ◽  
...  
Keyword(s):  
Genetic Diversity ◽  
Maternal Origin ◽  
Indigenous Chickens
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