Growth, food conversion, carcass yields and their heritabilities in ducks (<i>anas platyrhynchos)</i>

Clayton, G. A.; Powell, J. C.

doi:10.1080/00071667908416556

Cited by 9 publications

(4 citation statements)

References 2 publications

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“…The heritability is higher for breast width (0.69) than for breast length (0.48, Table 1 Means ( , 1988) are much higher than the values obtained for weight at slaughter (0.28, Table 1; 0.31, SOCHOCKA and WEZYK, 1971;0.28, PINGEL andJUNG, 1979, 0.35 PINGEL andHEIMPOLD, 1983). The h 2 value of 0.27 for weight gain is much lower than the estimate of 0.73 obtained in the Pekin ducks sample investigated by CLAYTON and POWELL (1979…”

Section: (A) Heritabilitiescontrasting

confidence: 63%

Effects of genetic control of subcutaneous fat deposition via using restricted selection indexes on live Performance and carcass characteristics of Pekin ducklings

et al. 2000

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Abstract. Estimates of phenotypic and genetic parameters for live Performance and detaiied dissection traits of body components and carcass tissues in Pekin ducks were calculated and used to construct selection indexes. The expected reduction in potential gain in live weight, dressing percentage and carcass characteristics resulting from restricting change in subcutaneous fat level to zero were assessed. The aggregate genotype measurements were weight at slaughter, dressing percentage and percent subcutaneous fat. The index measurements were weight at hatching, weight at slaughter, weight gain, breast width, breast length and breast circumference. The restricted indexes as compared with the unrestricted would lead to minimum reduction in potential gain of 29.4% in total net merit, 96.4% in weight at slaughter, 49.0% in dressing percentage, 74.0% in dissected side weight and 75.0% in muscle to bone ratio. The potential reduction in percent abdominal fat and percent bone in side was decreased by at least 38.5% and 80.2%, respectively. Absolute genetic response results showed that selecting for breast width alone (rTI = 0.79) would be recommended for birds with substandard levels of SCF, whereas use of the restricted index containing weight at hatching and breast width (rTI = 0.54) would be advised for individuals with Standard fatness.

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Section: (A) Heritabilitiescontrasting

confidence: 63%

Effects of genetic control of subcutaneous fat deposition via using restricted selection indexes on live Performance and carcass characteristics of Pekin ducklings

et al. 2000

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“…The realized heritability was high too in the selection experiment reported by K atle and K olstad (1991) in laying hens. In contrast, the heritability of feed conversion ratio seems to be low ( van B ebber and M ercer 1994, in broilers; J ungst et al 1981, and B ereskin 1986, in pigs) or moderate (P irchner 1985, and T ixier ‐B oichard et al 1995, in laying hens; W ilson 1969, P ym and N ichols 1979, and W ang et al 1994, in broilers; C layton and P owell 1979, in ducks; M rode and K ennedy 1993, in pigs; J ensen et al 1992, in beef cattle). The realized heritability found in experiments of selection for feed conversion has been generally low (W ang et al 1991, in laying hens; P ym and N ichols 1979, in broilers; J ungst et al 1981, and W ebb and K ing 1983, in pigs; S utherland et al 1970, and Y üksel et al 1981, in mice; N otter et al 1976, and W ang and D ickerson 1984, in rats).…”

Section: Discussionmentioning

confidence: 99%

Experimental comparison between selection for residual feed consumption and feed conversion ratio in Tribolium

Campo

Turrado

1998

J Animal Breeding Genetics

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Summary Selection for residual feed consumption based on genotypic regression (RE) was compared with selection for feed conversion ratio (RA) using two experiments of downward selection for feed efficiency in Tribolium castaneum. The first experiment was designed to decrease feed consumption: weight gain, with residual feed consumption being based on weight gain from 7 to 14 days and initial weight, whereas the second experiment was intended to decrease feed consumption: egg mass, with residual feed consumption being based on egg mass between 28 and 30 days and adult weight. There were four generations of selection with four replicates, and a selected proportion of 20%. For each replicate, an unselected control was produced. Responses observed for the feed conversion ratio differed significantly between lines (p < 0.05) in both experiments; the RE lines having the greatest responses. The superiority of residual feed consumption as a selection criterion also held when this trait was considered as the selection objective, with mean responses differing significantly between lines (p < 0.05). It is suggested that both traits describe similar aspects of feed efficiency. The selection criterion used in line RE was equivalent to a restricted selection index, as was expected. The observed responses in the RA line were less than expected, especially in experiment 1, confirming the problems that may appear when a ratio is used directly as a selection criterion. The realized heritability was greater in a RE line in both experiments, in agreement with the theoretical expectations. The results show that residual feed consumption based on genotypical regression was an efficient selection method with respect to efficiency of feed usage. Resumen Comparación experimental entre la selección para consumo residual y la selección para conversión de alimento en Tribolium La selección para consumo residual basado en la regresión genotípica (RE) fue comparada con la selección para conversión de alimento (RA) usando dos experimentos en Tribolium castaneum. El primer experimento se diseñó para disminuir el cociente consumo: ganancia de peso, estando basado el consumo residual en la ganancia de peso entre 7 y 14 días y el peso inicial. El segundo experimento trató de disminuir el cociente consumo: masa de huevos, basándose el consumo residual en la masa de huevos entre 28 y 30 días y el peso adulto. Se hicieron cuatro generaciones de selección con cuatro repeticiones y una proporción de selección del 20%. En cada repetición había un control sin seleccionar. Las respuestas obtenidas para la conversión de alimento diferían significativamente entre líneas en ambos experimentos (p < 0.05), teniendo la línea RE mayor respuesta. La superioridad de esta línea se mantenía al considerar el consumo residual como objetivo de selección. Esto sugiere que ambos caracteres describen aspectos similares de la eficiencia alimenticia. El criterio de selección usado en la línea RE fue equivalente a un índice de selección con restricción, como era de esperar. ...

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“…The hope for genetic improvement lies in the determination of heritability estimates for production traits. However, it is not certain that selection for breast muscle mass in ducks will improve the proportion of lean meat (Clayton and Powell, 1979). Two questions remain.…”

Section: Discussionmentioning

confidence: 99%

“…Heritability studies for meat production in ducks (Clayton and Powell, 1979) indicate that breast muscle weight should respond to selection, but the collateral effect of such selection on the remaining musculature is uncertain, possibly because of the marked changes in carcass shape observed by Stadelman and Meinert (1977). The allometric growth equation used by Huxley (1932) to quantify proportional changes in body shape was used to investigate this problem.…”

Section: Introductionmentioning

confidence: 99%

Development of Carcass Shape in Pekin and Muscovy Ducks

Swatland

1980

Poultry Science

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Male and female White Muscovy and White Pekin ducks were killed at weekly intervals from hatching to 10 weeks. Their carcasses were dissected and lengths of skeletal units and weights of representative muscles were recorded. Data were analysed for allometric (proportional) growth relative to keel length or unilateral breast muscle weight using Huxley's allometric growth equation. Wing bones tended to grow proportionally faster than keel length; this was most evident in Muscovies, possibly because of their greater powers of flight. Skull and leg bones grew proportionally more slowly than keel length. Biceps brachii, semitendinosus, and gastrocnemius muscles grew proportionally more slowly than breast muscles. The existing pattern of allometric growth in duck carcasses suggests that the response of total muscle mass to selection for increased breast muscle mass will be greater in Muscovies relative to Pekins with similar breast improvement. (

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Growth, food conversion, carcass yields and their heritabilities in ducks (anas platyrhynchos)

Cited by 9 publications

References 2 publications

Effects of genetic control of subcutaneous fat deposition via using restricted selection indexes on live Performance and carcass characteristics of Pekin ducklings

Effects of genetic control of subcutaneous fat deposition via using restricted selection indexes on live Performance and carcass characteristics of Pekin ducklings

Experimental comparison between selection for residual feed consumption and feed conversion ratio in Tribolium

Development of Carcass Shape in Pekin and Muscovy Ducks

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