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Allometric growth of protein, amino acids, fat and minerals in slow- and fast-growing young chickens

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dc.title Allometric growth of protein, amino acids, fat and minerals in slow- and fast-growing young chickens en
dc.contributor.author Zelenka, Jiří
dc.contributor.author Heger, Jaroslav
dc.contributor.author Kráčmar, Stanislav
dc.contributor.author Mrkvicová, Eva
dc.relation.ispartof Czech Journal of Animal Science
dc.identifier.issn 1212-1819 Scopus Sources, Sherpa/RoMEO, JCR
dc.date.issued 2011
utb.relation.volume 56
utb.relation.issue 3
dc.citation.spage 127
dc.citation.epage 135
dc.type article
dc.language.iso en
dc.publisher Česká akademie zemědělských věd cs
dc.identifier.doi 10.17221/1300-CJAS
dc.relation.uri https://www.agriculturejournals.cz/web/cjas.htm?volume=56&firstPage=127&type=publishedArticle
dc.subject chickens en
dc.subject age en
dc.subject growth rate en
dc.subject chemical allometry en
dc.subject amino acid retention en
dc.description.abstract Allometric growth of body constituents and apparent efficiency of amino acid and nitrogen retention were examined in slow-growing laying-type cockerels (SG) and in fast-growing male broiler hybrids (FG) during the growth period from hatch to Day 22. The respective allometric coefficients for water, protein (N x 6.25), ash and fat in relation to body weight were 0.971, 1.080, 1.096 and 1.284 for SG chickens and 0.977, 1.099, 0.993, and 1.198 for FG chickens. The respective allometric coefficients describing the relationships of water, fat and ash weight with protein weight were 0.894, 1.014, and 1.186 for SG chickens and 0.893, 0.910, and 1.097 for FG chickens. High allometric coefficients for ash in both genotypes likely indicate the rapid growth of skeletal tissues which requires adequate mineral nutrition during this period of growth. The deposition of ash relative to protein was significantly higher (P < 0.05) in SG chickens thus suggesting that the relative growth of ash may be affected by genotype. Allometric coefficients relating amino acids to body protein were less than unity in most cases which indicates that an increasing amount of nonprotein N is deposited in the body with advancing age. Except for cysteine, the apparent efficiency of amino acid retention was lower in SG as compared to FG chickens. The high retention efficiency of cysteine in SG genotype was likely associated with the conversion of surplus methionine to cysteine, required for feather protein synthesis in laying-type birds at an early age. en
utb.faculty Faculty of Technology
dc.identifier.uri http://hdl.handle.net/10563/1002171
utb.identifier.rivid RIV/70883521:28110/11:43865344!RIV12-MSM-28110___
utb.identifier.obdid 43865346
utb.identifier.scopus 2-s2.0-79953862876
utb.identifier.wok 000288654000005
utb.source j-wok
dc.date.accessioned 2011-08-16T15:06:36Z
dc.date.available 2011-08-16T15:06:36Z
dc.rights.access openAccess
utb.contributor.internalauthor Kráčmar, Stanislav
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