Suitability of layer-type male chicks for capon production

Murawska, Daria; Gesek, M.; Witkowska, D.

doi:10.3382/ps/pez146

Cited by 12 publications

(16 citation statements)

References 33 publications

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“…The assessed groups of birds differed in terms of the internal organ share, and the greatest effect was exerted by the liver and gizzard share, which was significantly higher in sterilized birds. This corresponds to the results obtained by Rahman et al (2004), Chen et al (2006Chen et al ( , 2007, Zawadzka et al (2017) and Murawska et al (2019). The authors indicate that the liver is the main site of fatty acids synthesis in birds, and the increase in its mass may be caused by increased lipogenesis processes.…”

Section: Discussionsupporting

confidence: 90%

“…The authors indicate that the lower motor activity of castrated birds, affects the better use of feed, which is associated with higher weight gain and the deposition of particularly valuable intramuscular fat. In a study byMiguel et al (2008) conducted on Castellana Negra chickens, and a study byMurawska et al (2019) conducted on cockerels, there was no weight advantage of castrated roosters over uncastrated ones reported on Leghorn roosters, which may be related to the genetic origin of the birds, their feeding, age at castration, susceptibility to stress or slaughter date.…”

mentioning

confidence: 94%

“…Comparison of slaughter performance and meat quality of cockerels and capons by origin, age, breeding system and nutrition has been the subject of many studies (Tor et al, 2002, Rachman et al, 2004Tor et al, 2005;Sirri et al, 2009.;Symeon et al, 2010;Rikimaru et al, 2011;Sinanoglou et al, 2011;Volk et al, 2011;Symeon et al, 2012;Mahmud et al, 2013;Calik et al 2015;Kwiecień et al, 2015;Adamski et al, 2016 a, b;Amorim et al, 2016;Calik et al, 2017, Zawacka et al, 2017Kwiecień et al, 2018;Murawska et al 2019;Wojtysiak et al, 2019). The results of these studies unequivocally prove that as a result of the capon's surgery, the accumulation of fat tissue in the abdominal cavity, subcutaneous fat, and especially intramuscular fat increases, which makes the capon meat characterized by greater fineness, juiciness and tenderness.…”

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confidence: 99%

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Effects of Caponization on Growth Performance and Meat Physicochemical Properties of Crossbred Chickens

Calik

Świątkiewicz

Obrzut

et al. 2020

Annals of Animal Science

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The aim of the study was to determine the effect of caponizing on body weight and physicochemical properties of meat of the capons - hybrids obtained from the crossing of hens of the Yellow-Legged Partridge (Ż-33) breed with meat roosters. The study covered 80 roosters - hybrids, which were randomly assigned to two groups of 40 animals each (8 boxes of 10 pcs in each group). Group I (control) consisted of uncastrated roosters while group II included birds, which were castrated in 8th week of age under local anesthesia by a vet. Birds were fed ad libitum with the same standard diets and kept on litter under optimal environmental conditions with a stocking density of 7 animals/m2. At the end of fattening, i.e. in the 20th week of life, 8 birds with a body weight close to the group average were selected from each group for slaughter. After slaughter, the effectiveness of the procedure was checked (lack of testicles), then the slaughter performance of birds, physicochemical parameters of the pectoral and leg muscles were determined, and sensory evaluation was performed. The procedure of castration of roosters - hybrids had a positive effect on body weight, feed conversion ratio and carcass traits. The pectoral and leg muscles of the capons were characterized by better water absorption, brittleness and sensory evaluation compared to roosters. Among the assessed groups of birds there was also a variation in the coloring of whole carcasses and muscles, which were lighter (L*), more yellow (b*) and less red (a*) in caponized birds. In addition, the castration procedure had a positive effect on the total protein content in both the pectoral and leg muscles, which in turn, with a higher raw fat content, were distinguished by a favorable ratio of n-6/n-3 polyunsaturated fatty acids (PUFA). Based on the results, it can be concluded that the hybrids obtained from the crossbreeding of the Yellow-Legged Partridge (Ż-33) and Ross 308 meat roosters are good choice for capon production. They can complement poultry meat production with a niche product for consumers looking for products of exceptional quality.

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Section: Discussionsupporting

confidence: 90%

mentioning

confidence: 94%

mentioning

confidence: 99%

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Effects of Caponization on Growth Performance and Meat Physicochemical Properties of Crossbred Chickens

Calik

Świątkiewicz

Obrzut

et al. 2020

Annals of Animal Science

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“…There are three alternatives that are currently used to varying degrees in the egg industry, while others are still being further refined. The three alternatives are in-ovo sex determination (3), keeping the roosters of dual-purpose breeds for meat production (11)(12)(13)(14), and rearing roosters of layer breeds for processed meat products (15).…”

Section: Introductionmentioning

confidence: 99%

“…Another alternative to CMC at hatch is by rearing the male layer chicks for their meat, which in some studies has been chosen as an acceptable alternative (15,31). Layer chickens are bred for the production of eggs; therefore, both sexes are lean, have a high feed intake, and are of less mature body weight compared with broilers specifically bred for high growth rate and muscle mass (32).…”

Section: Introductionmentioning

confidence: 99%

The Need for an Alternative to Culling Day-Old Male Layer Chicks: A Survey on Awareness, Alternatives, and the Willingness to Pay for Alternatives in a Selected Population of Dutch Citizens

2021

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A concerning by-product of producing laying hen chicks are the hatched male layer chicks. As a consequence of their inability to lay eggs, these male chicks are culled as day-old chicks in the hatchery. To find an alternative for this ethical dilemma (generally), three alternatives are under study, namely, in ovo sex determination, using dual-purpose breeds, and the rearing of layer cockerels. In order to assess the awareness of this practice and preference for one of the alternatives, we conducted an online survey of the Dutch public. Most of the 259 respondents completing the survey were highly educated woman (HEW, n = 143) versus others (REST, n = 86). The questionnaire was divided into six topics: (1) general knowledge of the poultry industry, (2) awareness of culling male layer chicks (CMC), and (3) its acceptability, (4) alternatives to CMC, (5) willingness to pay (WTP) for eggs without CMC, and (6) WTP for cockerel meat. Awareness about CMC was 52%, and its acceptability was rejected by 78% (HEW) and 67% (REST). The level of acceptability increased when more salient facts were given, and almost all respondents agreed that an alternative was needed (90% HEW, 84% REST). For both groups of respondents, more than 50% preferred in ovo sex determination over keeping the current practice or using dual-purpose breeds or male layers. Furthermore, the majority of respondents were willing to pay more than double the price for eggs without CMC being involved. Roughly 40% would not buy processed cockerel meat burgers, most likely due to their vegan or vegetarian diet. Of the remaining respondents, half were willing to pay the current price or 1 euro more for processed cockerel meat burgers. The most important factors when buying poultry meat or eggs without CMC were food safety, animal friendliness (welfare), and the environment; price was the least important factor. Despite the skewed respondents' background, the results of our survey show that consumers are willing to pay more for poultry products that do not require culling day-old male chicks.

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Look at that!—The effect pictures have on consumer preferences for in ovo gender determination as an alternative to culling male chicks

2021

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Suitability of layer-type male chicks for capon production

Cited by 12 publications

References 33 publications

Effects of Caponization on Growth Performance and Meat Physicochemical Properties of Crossbred Chickens

Effects of Caponization on Growth Performance and Meat Physicochemical Properties of Crossbred Chickens

The Need for an Alternative to Culling Day-Old Male Layer Chicks: A Survey on Awareness, Alternatives, and the Willingness to Pay for Alternatives in a Selected Population of Dutch Citizens

Look at that!—The effect pictures have on consumer preferences for in ovo gender determination as an alternative to culling male chicks

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