Changes in Unselected Traits Accompanying Long-Term Selection for Four-Week Body Weight in Japanese Quail

Marks, H. L.

doi:10.3382/ps.0580269

Cited by 69 publications

(75 citation statements)

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“…But hens in L group showed higher egg production than those of hens in M and H groups as the experiment continued. Marks (1979) reported that egg production decreased depending on selection as to body weight of quails as the body weight increased. In addition, as body weight increased, feed consumption also increased, and differences in the feed consumption among the groups were determined to be significant from the beginning to the end of experiment ( Table 2).…”

Section: Discussionmentioning

confidence: 99%

Effects of differences in the initial body weight of groups on laying performance and egg quality parameters of Lohmann laying hens

Laçin¹,

Yıldız²,

Esenbuğa³

et al. 2008

Czech J. Anim. Sci.

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ABSTRACT:This study was carried out to investigate the effect of different body weight groups (light (L) = 1 400-1 500; medium (M) = 1 500-1 600 and heavy (H) = 1 600 < g) on performance and egg quality traits of Lohmann hens, 24 weeks of age, in different laying periods. A total of 288 Lohmann White layers were allocated randomly to three groups with respect to live weight, each consisting of 24 replicated cages as subgroups, comprising four hens. The study period lasting for 60 weeks was investigated as four different age periods (first period = 24-40 weeks; second period = 40-54 weeks; third period = 54-68 weeks; fourth period = 68-84 weeks). Differences in the initial live weight at the beginning of experiment among the groups continued to the end of experimental period. Considering the egg production, differences among the groups were not significant (P > 0.05) during the experimental period. Egg weight was determined to be lower in the group with low body weight (64.58 g) than in medium (64.97 g) and heavy hen groups (66.30 g). Differences in feed intake and feed conversion ratio among the groups were found significant, and the mean values were 123.93, 127.48 and 130.67 for feed consumption (g/day); 2.23, 2.28 and 2.27 for feed conversion ratio. Except for the feed conversion ratio, the effect of weight groups by age period interaction on performance parameters was significant (P < 0.01). The effects of body weight on shell strength, shell thickness and yolk index were not significant during the experimental period. However, different body weight groups significantly affected shape index, yolk colour, albumen index and Haugh unit parameters. Shell strength, yolk colour and yolk index values were affected by weight groups by age period interaction. In conclusion, Lohmann White hens in the light group in a uniform flock had higher egg production and lower feed conversion ratio values than those of other weight groups.

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Section: Discussionmentioning

confidence: 99%

Effects of differences in the initial body weight of groups on laying performance and egg quality parameters of Lohmann laying hens

Laçin¹,

Yıldız²,

Esenbuğa³

et al. 2008

Czech J. Anim. Sci.

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show abstract

“…In a study on the long-term selection for 4-week body weight in Japanese quails, Marks (1979) reported average egg production in all generations of 75.8% in the selected group and 81.1% in the control group, and emphasized that selection based on body weight causes a reduction in egg production. Anthony et al…”

Section: Effects Of Different Selection Methods Using Body Weight On mentioning

confidence: 99%

“…Baylan (2003) reported average egg weights over 23 weeks for M 55 , R 33 and S 55 lines as 13.0, 13.3, and 12.8 g, respectively. Working with Japanese quails, many researchers reported that egg weight increased as a result of selection for body weight (Woodard et al, 1973;Marks, 1976;Marks, 1979;Moritsu et al, 1997;Alkan et al, 2008). During their selection study of Japanese quails for high body weight in two different environments, Darden and Marks (1988) recorded increases of 1.4 and 1.3 g in egg weight after 11 generations.…”

Section: Effects Of Different Selection Methods Using Body Weight On mentioning

confidence: 99%

Effects of Different Selection Methods Using Body Weight on Egg Yield Parameters in Japanese Quail

Baylan

2017

Rev. Bras. Cienc. Avic.

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This experiment was conducted to investigate the effects of different selection methods of parent lines on the body weight of Japanese quails. For this purpose, line M 55 was subjected to individual selection for body weight at 5 weeks of age, while a reciprocal recurrent selection method was applied to lines R 33 and S 55 . Selection lasted two generations. Body weight changes, age and weight at sexual maturity, egg weight, and egg production were investigated in the parent generations as well as in the selection lines. Body weight at 5 weeks of age of the parents of the M 55 , R 33 and S 55 lines were 299.0, 285.3, and 280.4 g in the first generation, and 314.8, 316.6, and 306.8±3.11 g in the second generation, respectively. The first generation of the M 55, R 33 , and S 55 lines presented egg production rates of 73.4, 77.6, and 75.8%, respectively, and egg weights of 12.7, 11.9, and 12.1g, respectively. The second generation of the M 55, R 33 , and S 55 lines presented egg production rates of 74.6, 77.8, and 78.3%, and egg weights of 12.72, 12.59, and 12.56 g, respectively. Both egg production and egg weights were significantly different between the first and the second generations (p>0.05). As a result, despite significant increase in body weight of the selection lines, no significant differences in egg production or egg weight were determined among generations. However, reciprocal selection lines of both generations presented higher egg yield than the individual selected line.

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“…Selection for increased body size over a mere 40 generations, far less time than separates modern broilers from jungle fowl, has simi larly produced substantial (1.3-fold) increases in the Gompertz growth constant and twofold increases in asymptotic body mass in Japanese quail Coturnix coturnix japonica (Marks 1978).…”

Section: Comparisons Between Broilers and Jungle Fowlmentioning

confidence: 99%

Metabolic and Digestive Responses to Artificial Selection in Chickens

Jackson

Diamond

1996

Evolution

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Abstract,-Compared to ancestral wild jungle fowl, domestic broiler chickens have been consciously selected for large body size, relatively large pectoral muscles, rapid growth, and high feed efficiency. Hence intraspecific comparisons of these two strains could help identify consequences of unconscious artificial selection, trade-offs in energy allocation, and factors limiting energy budgets. We therefore compared our measurements of many corresponding parameters in both strains: growth rate, energy intake, digestive efficiency, metabolic rate and its components, organ masses, and intestinal brush-border nutrient transporter and hydrolase activities and capacities, as functions of age and body mass in zero-to nine-week-old chicks.Both strains prove to have the same digestive efficiency, Compared to equal-sized jungle fowl, broilers have higher daily energy intake and activity costs, Broilers have relatively longer and wider, hence heavier, small intestines, and their other gut compartments are also relatively larger. Offsetting these increases, broilers have relatively smaller brains and leg bones, these being much less important to a captive bird than to a wild bird exposed to predators. Broilers have generally lower intestinal transporter activities, but relatively higher transporter capacities because of their larger guts.Among domestic chicken strains, comparison of broilers with layers, the former having been consciously selected for much higher growth rates, yields generally similar conclusions. Thus, as recognized in broad outline by Darwin, domestication provides clear examples of conscious selection, of unconscious selection for traits prerequisite to the consciously selected traits, and of unconscious selection against traits rendered less important or competing for space or energy.Key words.-Conscious selection, domestication, energy budget, growth rate, intestinal transporters, metabolic rate, organ mass, unconscious selection.Received September 27, 1994, Accepted August 22, 1995 Changes of wild populations under domestication illustrate so well the effects of selection that Darwin (1859) devoted the first chapter of his book The Origin of Species to the subject. Many subsequent comparisons of animal domesticates with their wild ancestors have discussed effects of artificial selection on anatomical traits and behavior. In the present manuscript we instead discuss effects on the physiology of growth, metabolism, energy budgets, and digestion. As is well known, these processes differ widely among taxa (Kleiber 1965;Heusner 1985). Artificial selection provides us with an opportunity to identify physiological factors immediately responsible for variation in energy budgets, without the inevitable confounding effects of phylogeny. It may prove easier to identify those physiological factors by comparing fast-and slow-growing strains of the same wild ancestral species, expected to differ in only a modest number of respects, than by comparing more distantly related taxa. For example, such intraspecific compar...

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Changes in Unselected Traits Accompanying Long-Term Selection for Four-Week Body Weight in Japanese Quail

Cited by 69 publications

References 6 publications

Effects of differences in the initial body weight of groups on laying performance and egg quality parameters of Lohmann laying hens

Effects of differences in the initial body weight of groups on laying performance and egg quality parameters of Lohmann laying hens

Effects of Different Selection Methods Using Body Weight on Egg Yield Parameters in Japanese Quail

Metabolic and Digestive Responses to Artificial Selection in Chickens

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