Comparison of free range broiler chicken strains raised in confined or semi-confined systems

Santos, Alessandro Carvalho dos; Sakomura, N. K.; Freitas, Ednardo Rodrigues; Fortes, C. M. L. Sá; Carrilho, Envm

doi:10.1590/s1516-635x2005000200004

Cited by 69 publications

(54 citation statements)

References 8 publications

(7 reference statements)

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“…Bogosavljević-Bošković et al (2010; did not prove any effect of the free-range system on the proportion of particular parts of carcass, including breasts, thighs and drumsticks, compared with broilers housed indoors, although different commercial hybrids were used in the two experiments (Hydro G and Cobb500). Similar results were obtained by Santos et al (2008). However, Dou et al (2009) as well as Castelini et al (2002), report that chickens under a free-range system are characterized by a higher proportion of breasts and thighs.…”

Section: The Effect Of Housing System On Muscle Content and Fattinesssupporting

confidence: 71%

Results of Rearing Broiler Chickens Under Various Systems

Kuźniacka

Adamski

Czarnecki

et al. 2014

JAS

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The aim of the study was comparison of the results of rearing broilers kept under intensive and semi-intensive systems, fed with complete feeds with an addition of various proportions of wheat grain. The study was carried out on 100 broilers, HUBBARD -FLEX, of both sexes. The birds were reared up to 42 days of age in an intensive system (group I), as well as in a semi-intensive system (group II). In the 5th week of rearing, in the nutrition of group II, 30% of complete feed was replaced with wheat grain, increasing its proportion in the dose up to 50% in the last week of rearing. System of keeping broilers did not affect significantly their bodyweight at the end of rearing, as well as their meat yield and muscle content in carcasses. Chicken fed with complete feeds, kept under an intensive system were distinguished by higher fattiness expressed as an abdominal fat weight, as well as by lower average intake of feed mixtures per individual broiler.

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Section: The Effect Of Housing System On Muscle Content and Fattinesssupporting

confidence: 71%

Results of Rearing Broiler Chickens Under Various Systems

Kuźniacka

Adamski

Czarnecki

et al. 2014

JAS

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“…The organ weight relative to carcass weight of the entire GIT, proventriculus, gizzard and caeca were higher for Venda chickens than broiler chickens. The above findings were similar to those observed by Santos et al (2005). The relative gizzard weight was higher for Venda chickens than broiler chickens, with female having higher relative weight than males.…”

Section: Discussionsupporting

confidence: 90%

Breed and Sex Differences in the Gross Anatomy, Digesta pH and Histomorphology of the Gastrointestinal Tract of Gallus Gallus Domesticus

Mabelebele

Norris

Brown

et al. 2017

Rev. Bras. Cienc. Avic.

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A study was conducted to investigate the influence of breed and sex in the gross anatomy, digesta and histology of Ross 308 broiler and Venda chickens. Chickens were slaughtered at 90 days of age and the pH of the digestive organs was measured immediately after slaughter.The digestive organ weights and lengths of Ross 308 broiler and Venda chickens were measured. Tissue samples of the duodenum, ileum and jejunal from each treatment group were collected and histologically examined. Higher (p<0.05) gizzard pH values were observed in male and female of Ross 308 broiler and Venda chickens. The jejunal and ileal pH values were lower (p<0.05) for Venda chickens than in Ross 308 broiler chickens. The absolute weights of the gastrointestinal tract, crop, proventriculus and gizzard were lighter (p<0.05) in Venda chickens than in Ross 308 broiler chickens. The relative organ weights of the GIT, proventriculus, gizzard and caeca were higher (p<0.05) in Venda chickens than in Ross 308 broiler chickens aged 90 days. Male chickens had higher (p<0.05) relative organ weights than female chickens. Interactions between breed and sex influenced (p<0.05) the absolute weights of the crop, proventriculus, caeca and large intestine. Ileum villus heights of female Venda chickens were higher (p<0.05) than those of female and male Ross 308 broiler and Venda chickens. The male and female Ross 308 broiler chickens had higher (p<0.05) ileum and duodenum crypt depths than male and female Venda chickens. The duodenum and ileum villus height/crypt depth ratios were higher (p<0.05) in male and female Venda chickens than Ross 308 broiler chickens. In overall, male broiler chicken performed better.

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“…The insignificant difference between the strains in mortality rate suggests that perhaps the durations of restriction used in this study were not long enough to cause differences between the strains. The higher abdominal fat in Ross 308 than Hubbard supports similar observations by Santos et al (2005). A positive genetic correlation ranging from 0.21 to 0.36 exists between live weight and abdominal fat percentage (Chambers, 1990) therefore the significantly higher abdominal fat deposition by Ross 308 than Hubbard is to be expected on account of its heavier final live weight (2848 vs. 2278 g).…”

Section: Discussionsupporting

confidence: 72%

Responses of two broiler chicken strains to early-age skip-a-day feed restriction in a semi-arid subtropical environment

Netshipale¹,

Benyi²,

Baloyi³

et al. 2012

Afr. J. Agric. Res.

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Four hundred and eighty 7-day-old Ross 308 and Hubbard chicks were fed ad libitum or full-fed every other day for 4, 6 and 8 days followed by ad libitum feeding to 49 days of age in a 2 x factorial experiment to study the effects of the different treatments on growth. The strains did not differ in feed conversion ratio and mortality rate but Ross 308 gained more weight and was heavier at market age but consumed more feed and deposited more abdominal fat. Overall, feed removal neither reduced feed intake and mortality rate nor improved feed efficiency but the control and the 4-and 6-day feed restricted birds had similar post-restriction weight gains and market weights and deposited more abdominal fat than the 8-day feed restricted ones. There was a significant strain × feeding regime interaction effects on 49-day weight and weight gain from 7 to 21 days. It is suggested that for profitable broiler production in the subtropics, Ross 308 be used and feed-restricted for 6 days during the starter period.

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Comparison of free range broiler chicken strains raised in confined or semi-confined systems

Cited by 69 publications

References 8 publications

Results of Rearing Broiler Chickens Under Various Systems

Results of Rearing Broiler Chickens Under Various Systems

Breed and Sex Differences in the Gross Anatomy, Digesta pH and Histomorphology of the Gastrointestinal Tract of Gallus Gallus Domesticus

Responses of two broiler chicken strains to early-age skip-a-day feed restriction in a semi-arid subtropical environment

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