Canonical discriminant analysis applied to broiler chicken performance

Rosário, Millor Fernandes do; Silva, M. A. N.; Coelho, Antônio Augusto Domingos; Savino, Vicente José Maria; Dias, Carolina

doi:10.1017/s1751731107001012

Cited by 24 publications

(20 citation statements)

References 16 publications

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“…Accordingly, Berzaghi et al (2005) used the discriminant analysis to discriminate breast meat from different feeding sources based on the fatty acid composition. Several authors also used discriminant analysis to evaluate broiler chicken performance (Rosário et al, 2008); to discriminate between chicken, turkey, pork, beef and lamb (Arnalds et al, 2004); to classify poultry carcasses (Park et al, 2002).…”

Section: Meat Physical and Chemical Characteristicsmentioning

confidence: 99%

Effect of caponisation on physicochemical and sensory characteristics of chickens

Amorim

Rodrigues

Pereira

et al. 2016

Animal

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The meat fats content associated to nutritional and sensory characteristics are the most important concerns of consumers. To study the effect of caponisation on the meat quality of two different breed chickens, slaughtered at 18 weeks of age, raised under the same conditions, the physicochemical and sensory characteristics of capons (castrated males at 8 weeks of age) and roosters' meat of native Amarela Portuguesa and native Pedrês Portuguesa breeds were evaluated. Forty Amarela (20 roosters and 20 capons), 40 Pedrês (20 roosters and 20 capons) chickens, and also, six free-range chicken and six broilers were evaluated. The pH, waterholding capacity, Warner-Bratzler shear force, moisture content, ash, myoglobin, collagen, CP, total fat and fatty acids profile were evaluated in breast and leg meat, according to standard procedures. Leg meat capon showed greater intramuscular fat content ( P ⩽ 0.05), monounsaturated fatty acids (MUFA) and CP ( P ⩽ 0.001) than leg roosters. Caponisation increased the content of myoglobin and MUFA ( P ⩽ 0.05) and reduced the moisture content in the leg ( P ⩽ 0.05). The main fatty acids found were oleic acid (C18:1), palmitic acid (C16:0) and linoleic acid (C18:2). The greatest value of C18:1 was observed in capon's breast ( P ⩽ 0.01). Sensory analysis was made to compare the Amarela and Pedrês meat with a free-range chicken and a broiler. The sensory taste panel classified the capon's meat (Amarela and Pedrês) as juicier, less fibrous and tougher than rooster's meat. The broiler was in general juicier, tenderer and less fibrous than the other birds. The results of sensory analysis complement those obtained in physicochemical analysis, suggesting that caponisation promotes an overall improvement in meat quality.

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Section: Meat Physical and Chemical Characteristicsmentioning

confidence: 99%

Effect of caponisation on physicochemical and sensory characteristics of chickens

Amorim

Rodrigues

Pereira

et al. 2016

Animal

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“…Concerning the effects of breed on the five examined performance traits, MANOVA showed the same results as that of univariate analysis [ 23 ]. The tests of equality of group means, calculated by canonical DA were also not significant (p>0.05), suggesting that the five variables could not serve for the discrimination between Ross and Hubbard broilers.…”

Section: Discussionmentioning

confidence: 94%

Influence of microclimatic ammonia levels on productive performance of different broilers' breeds estimated with univariate and multivariate approaches

Soliman¹,

Moawed²,

Hassan³

2017

Vet World

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Background and Aim:Birds litter contains unutilized nitrogen in the form of uric acid that is converted into ammonia; a fact that does not only affect poultry performance but also has a negative effect on people’s health around the farm and contributes in the environmental degradation. The influence of microclimatic ammonia emissions on Ross and Hubbard broilers reared in different housing systems at two consecutive seasons (fall and winter) was evaluated using a discriminant function analysis to differentiate between Ross and Hubbard breeds.Materials and Methods:A total number of 400 air samples were collected and analyzed for ammonia levels during the experimental period. Data were analyzed using univariate and multivariate statistical methods.Results:Ammonia levels were significantly higher (p< 0.01) in the Ross compared to the Hubbard breed farm, although no significant differences (p>0.05) were found between the two farms in body weight, body weight gain, feed intake, feed conversion ratio, and performance index (PI) of broilers. Body weight; weight gain and PI had increased values (p< 0.01) during fall compared to winter irrespective of broiler breed. Ammonia emissions were positively (although weekly) correlated with the ambient relative humidity (r=0.383; p< 0.01), but not with the ambient temperature (r=−0.045; p>0.05). Test of significance of discriminant function analysis did not show a classification based on the studied traits suggesting that they cannot been used as predictor variables. The percentage of correct classification was 52% and it was improved after deletion of highly correlated traits to 57%.Conclusion:The study revealed that broiler’s growth was negatively affected by increased microclimatic ammonia concentrations and recommended the analysis of broilers’ growth performance parameters data using multivariate discriminant function analysis.

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“…Correlation analysis is liable to measure the level of association between two traits which must be understood in any breeding programme. Biological characters are naturally correlated as a result of pleiotropy and linkage [21,22]. Result obtained revealed a significant positive relationship between β-carotene and ash, fibre, Ca, flavonoids, alkaloid.…”

Section: Resultsmentioning

confidence: 99%

Effect of Different Mutagens on Some Mineral, Phytochemical and Proximate Composition of Two Red Pepper Varieties

Abu

Omeke

Ojua

2019

ARRB

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Aim: This research was designed to evaluate the effects of different levels of three mutagens on two pepper varieties with a vision of choosing mutants with high values in biochemical contents that may possibly be valuable in breeding improved varieties of the plant. Methods: Seeds of pepper were exposed to varying doses of gamma rays 60 Co (50, 100, 150, and 200Gy), X-ray doses (40, 60, 80, and 100KV) and sodium azide (0.01, 0.02, 0.03 and 0.04%). The treated seeds and the controls were grown in the Botanic Garden of the University of Nigeria, Nsukka using a Completely Randomized Design. Results: The result showed that vitamin C and β-carotene ranged from 5.89 -26.88 and 2.62 -11.35 mg/100 g, Fe and Ca (14.70 and 13.78 mg/100 g) were highest in Shombo at 100Gy. Values ranging from 0.36-2.00 and 3.96 -18.82 mg/100 g were recorded for flavonoid and alkaloid content across all treatment combinations. The result also revealed that at 100Kv and 150Gy, ash Abu et al.; ARRB, 33(2): 1-13, 2019; Article no.ARRB.51702 2 content increased in both varieties. The highest protein concentration of 9.57% was recorded at 100Kv of X-ray in Shombo and 6.96% at 150Gy of gamma irradiation in Tatase variety. Principal component analysis explained extracted five principal axis which accounted for the variability of 72.54%. Conclusion: This study reveals that biochemical content in pepper could be improved with exposure to mutagens especially gamma irradiation. Original Research Article

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Canonical discriminant analysis applied to broiler chicken performance

Cited by 24 publications

References 16 publications

Effect of caponisation on physicochemical and sensory characteristics of chickens

Effect of caponisation on physicochemical and sensory characteristics of chickens

Influence of microclimatic ammonia levels on productive performance of different broilers' breeds estimated with univariate and multivariate approaches

Effect of Different Mutagens on Some Mineral, Phytochemical and Proximate Composition of Two Red Pepper Varieties

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