scholarly journals The effect of fattening duration in different rearing systems on slaughter traits of broiler chickens of genotype Redbro

2007 ◽  
Vol 23 (3-4) ◽  
pp. 67-74 ◽  
Author(s):  
Zdenka Skrbic ◽  
Z. Pavlovski ◽  
M. Lukic
Keyword(s):  
Body Mass ◽  
Broiler Chickens ◽  
Considerable Effect ◽  
Abdominal Fat ◽  
Lower Body ◽  
Free Range ◽  
Two Systems ◽  
Fattening Period ◽  
Slow Growing

Slow growing chickens of genotype Redbro, were reared in two systems in order to determine the effect of duration of fattening on values of slaughter yields/dressing percentages and shares of main carcass parts. Fattening of chickens in chicken coop to age of 84 days had considerable effect on increase of slaughter yields: "Conventional processing"(83.59%), "Ready to roast"(77.22%) and "Ready to grill"(67.17%) compared to 42nd day of age (82.21; 74.87 and 65.42%). Redbro chickens reared on free range had lower body masses compared to chickens reared from chicken coops in all investigated ages. Beside significant increase of body mass, longer fattening period influenced considerably decrease of share of back, pelvic and wings. In both rearing systems, prolonging of fattening had statistically significant effect on increase of share of abdominal fat. .

scholarly journals Effects of shelter type, early environmental enrichment and weather conditions on free-range behaviour of slow-growing broiler chickens

animal ◽  
2017 ◽  
Vol 11 (6) ◽  
pp. 1046-1053 ◽  
Author(s):  
L.M. Stadig ◽  
T.B. Rodenburg ◽  
B. Ampe ◽  
B. Reubens ◽  
F.A.M. Tuyttens
Keyword(s):  
Broiler Chickens ◽  
Environmental Enrichment ◽  
Weather Conditions ◽  
Free Range ◽  
Slow Growing

Effect of free-range access, shelter type and weather conditions on free-range use and welfare of slow-growing broiler chickens

2017 ◽  
Vol 192 ◽  
pp. 15-23 ◽  
Author(s):  
Lisanne M. Stadig ◽  
T. Bas Rodenburg ◽  
Bart Ampe ◽  
Bert Reubens ◽  
Frank A.M. Tuyttens
Keyword(s):  
Broiler Chickens ◽  
Weather Conditions ◽  
Range Use ◽  
Free Range ◽  
Slow Growing

scholarly journals The effect of sex and rearing system on carcass composition and cut yields of broiler chickens

2011 ◽  
Vol 51 (No. 1) ◽  
pp. 31-38 ◽  
Author(s):  
S. Bogosavljevic-Boskovic ◽  
V. Kurcubic ◽  
Petrovic MD ◽  
V. Radovic
Keyword(s):  
Meat Quality ◽  
Broiler Chickens ◽  
Quality Parameters ◽  
Abdominal Fat ◽  
Carcass Composition ◽  
System Quality ◽  
Broiler Meat ◽  
Poultry House ◽  
Free Range ◽  
Broiler Meat Quality

The objective of this study is an analysis of meat quality in broilers of standard fast-growing hybrid Hybro G, reared in two different non-industrial systems (extensive rearing in a poultry house or &ldquo;extensive indoor&rdquo; system and rearing in a poultry house using a free range or &ldquo;free-range&rdquo; system). Quality parameters, i.e. proportions of basic carcass parts (breasts, drumsticks and thighs), abdominal fat, and proportions of basic tissues (muscles, bones and skin) in more valuable carcass parts, were investigated. The aim of the investigation was to analyse the effect of the two non-industrial rearing systems and broiler sex on the above-mentioned traits of broiler meat quality. The used rearing systems (free-range and extensive indoor ones) did not have a statistically significant effect on the proportions of major basic carcass parts and of abdominal fat in broiler chickens (P &gt; 0.05). Heavier carcasses at slaughter (on the 56<sup>th</sup> day of fattening) were recorded in the male broilers compared to the female ones, the differences being statistically significant (P &lt; 0.01). The drumstick proportion in the male broiler carcasses was statistically significantly higher (P &lt; 0.05) than the proportion in the female broilers. The interaction between the investigated effects (of sex and rearing system) did not exert a statistically significant effect on the proportions of major basic carcass parts and abdominal fat in broiler chickens (P &gt; 0.05). The rearing system (free-range and extensive indoor) and the interaction between the investigated effects (of sex and rearing system) did not affect statistically significantly the differences expressed in the meat, skin and bone proportions in breasts, drumsticks and thighs of the broilers (P &gt; 0.05). The sex effect on the skin proportions in breasts, drumsticks and thighs was not statistically significant (P &gt; 0.05). Average muscle proportions in drumsticks and thighs of the female broilers were statistically highly significantly (P &lt; 0.01) and significantly (P &lt; 0.05) higher compared to those in the male broilers. Average bone proportions in the breasts of the male broilers were statistically significantly higher (P &lt; 0.05) than those in the female ones, and statistically highly significantly higher (P &lt; 0.01) in drumsticks and thighs. &nbsp;

scholarly journals Metabolizable Energy Levels for Free-Range Broiler Chickens

2020 ◽  
Vol 8 (3) ◽  
pp. 820
Author(s):  
Luanna Lopes Paiva Copat ◽  
Karina Marcia Ribeiro de Souza Nascimento ◽  
Charles Kiefer ◽  
Patrícia Rodrigues Berno ◽  
Henrique Barbosa de Freitas ◽  
...  
Keyword(s):  
Broiler Chickens ◽  
Energy Levels ◽  
Protein Body ◽  
Abdominal Fat ◽  
Metabolizable Energy ◽  
Feed Conversion ◽  
Carcass Yield ◽  
Free Range ◽  
Randomized Design ◽  
Completely Randomized Design

The aim of this study was to evaluate the effect of dietary metabolizable energy levels on the performance and carcass yield of free-range broiler chickens from 1 to 84 days of age. A total of 900 male day-old naked neck lineage chicks were distributed in a completely randomized design between six levels of metabolizable energy (2,700; 2,800; 2,900; 3,000; 3,100 and 3,200 kcal.kg-1 diet) with six replications of 25 birds each. The increase in levels of dietary metabolizable energy resulted in a linear reduction of the feed intake, crude protein and digestible lysine intakes, as well as in the protein body deposition and protein efficiency and linear improvements in the feed conversion ratio of chickens in all experimental phases. The carcass yield, wing and abdominal fat weight and percentage of abdominal fat reduced linearly by increasing the level of dietary metabolizable energy. The diet including 2700 kcal.kg-1 of metabolizable energy in the diet of free-range broiler chickens in phases 1 to 28, 28 and 56 and 57 to 84 days of age does not interfere in the broilers performance and results in a better carcass yield in the final period of production.

scholarly journals The effect of protease on productive and slaughter traits in broiler chickens

2012 ◽  
Vol 28 (4) ◽  
pp. 817-826
Author(s):  
V. Doskovic ◽  
S. Bogosavljevic-Boskovic ◽  
Z. Pavlovski ◽  
B. Milosevic ◽  
Z. Skrbic ◽  
...  
Keyword(s):  
Body Weight ◽  
Broiler Chickens ◽  
Abdominal Fat ◽  
Carcass Weight ◽  
Production Traits ◽  
Fast Growing ◽  
Protein Levels ◽  
Carcass Conformation ◽  
Slow Growing ◽  
Protein Diets

Carcass conformation is a very important parameter in assessing the overall appearance and meatiness of broilers. This study evaluates the effect of protease supplemented to reduced protein diets on production traits, dressed carcass weight and conformation measures in fast-growing Cobb 500 and slow-growing Master Gris broilers over a fattening period of 49 days. At slaughter, the following measurements were taken: pre-slaughter body weight (BW), conventionally dressed carcass weight and abdominal fat weight. Following carcass dissection into primal cuts, absolute conformation values, including metatarsus length (ML), keel length (KL), breast depth (BD), breast angle (BA) and thigh girth (TG), were determined. For carcass conformation evaluation purposes, index values of carcass conformation measures BW/ML, BW/KL, BW/BD and BW/TG were identified. Genotype and sex had a significant effect on dressed carcass weight and all conformation measures, whereas the effect of different protein levels in protease-supplemented diets was significant only in Master Gris, for metatarsus length and the following indices: BW/ML, BW/KL and BW/TG.

scholarly journals Effect of dietary protein level and length of fattening period on dressing percentage and carcass conformation in broiler chickens

2017 ◽  
Vol 33 (2) ◽  
pp. 211-219
Author(s):  
Vladimir Doskovic ◽  
Snezana Bogosavljevic-Boskovic ◽  
Zdenka Skrbic ◽  
Radojica Djokovic ◽  
Simeon Rakonjac ◽  
...  
Keyword(s):  
Broiler Chickens ◽  
Crude Protein ◽  
Dietary Treatment ◽  
Abdominal Fat ◽  
Fat Percentage ◽  
Protein Levels ◽  
Dietary Protein Level ◽  
Dressing Percentage ◽  
Fattening Period ◽  
Almost All

This study analyses the effect of different protein levels in broiler feeds (supplemented with protease) and different lengths of fattening period on some parameters related to dressed carcass quality. Medium-growing Master Gris broiler chickens were used in a fattening trial lasting 63 days. At slaughter, dressing percentages and abdominal fat percentages were determined based on traditionally dressed carcass weights and abdominal fat weights of broilers at 49 and 63 days, and conformation indices were calculated based on absolute conformation measurements. Results showed that dietary treatment had an effect only on one relative conformation measurement - body weight/shank length in chickens at 49 days, as control broilers had higher values of this index compared to chickens receiving feeds containing reduced levels of crude protein and protease supplementation (0.2% or 0.3%). Length of fattening period affected almost all studied parameters, except breast angle, dressing percentage of traditionally dressed carcass and abdominal fat percentage.

scholarly journals Effects of free-range access on production parameters and meat quality, composition and taste in slow-growing broiler chickens

2016 ◽  
Vol 95 (12) ◽  
pp. 2971-2978 ◽  
Author(s):  
Lisanne M. Stadig ◽  
T. Bas Rodenburg ◽  
Bert Reubens ◽  
Johan Aerts ◽  
Barbara Duquenne ◽  
...  
Keyword(s):  
Meat Quality ◽  
Broiler Chickens ◽  
Free Range ◽  
Production Parameters ◽  
Slow Growing

scholarly journals The quantity of abdominal fat in broiler chicken of different genotypes from fifth to seventh week of age

2007 ◽  
Vol 23 (5-6-2) ◽  
pp. 331-338 ◽  
Author(s):  
N. Nikolova ◽  
Z. Pavlovski ◽  
N. Milosevic ◽  
L. Peric
Keyword(s):  
Body Mass ◽  
Broiler Chickens ◽  
Broiler Chicken ◽  
Abdominal Fat ◽  
The Body ◽  
Random Selection ◽  
Intensive Rearing ◽  
Production Conditions ◽  
Technical Recommendations

In this work quantity of abdominal fat (weight and portion) was examined in broilers of two genotypes in the fifth, sixth and seventh week of their growth. The examination was carried out in production conditions, in the facility for commercial fattening of broilers chickens, so all technical recommendations related to intensive rearing of chickens were provided. Broilers Cobb 500 and Hubbard Classic which were housed in separate boxes (8 boxes for each genotype) were used as a material. Forty male chickens and forty female chickens at the 5, 6 and 7 weeks of age were selected for slaughtering by random selection, so 240 all together sacrificed chickens were prepared for further treatment. By cutting of the carcasses, abdominal fat was removed and measured, and it was put in proportion to the body mass before slaughtering and in this way the share of abdominal fat was obtained. All data was statistically processed by the subprogram Basic Statistic and Anova. The chickens of the genotype Hubbard had significantly higher share (0,96%) and insignificantly higher weight (19,47g) of abdominal fat than Cobb 500 (0,83% and 17,16g). Female chickens of both genotypes in the examination had significantly higher weight (19,84g) and share (0,96%) of abdominal fat in carcass then male broilers. Chickens at the age of 49 days had statistically significantly higher abdominal fat than the chick at the age of 42 and 35 days in absolute (25,35g) and relative values (1,06%). This confirms the importance of the examined factors on the amount of abdominal fat in carcass of broiler chickens.

scholarly journals Effects of sex and genotype on performance and yield characteristics of free range broiler chickens

2013 ◽  
Vol 65 (5) ◽  
pp. 1483-1490 ◽  
Author(s):  
C.C. Del Castilho ◽  
T.T Santos ◽  
C.A.F. Rodrigues ◽  
R.A. Torres Filho
Keyword(s):  
Weight Gain ◽  
Experimental Design ◽  
Soybean Meal ◽  
Broiler Chickens ◽  
Production Systems ◽  
Feed Conversion ◽  
Free Range ◽  
Feeding Program ◽  
Slow Growing ◽  
Better Than

The purpose of this work was to evaluate the effect of genotype and sex on the performance characteristics (weight gain, feed conversion and livability) and yields (carcass, breast and legs) of six free-range genotypes: Pesadão Vermelho (GEN1), Carijó (GEN2), Pescoço Pelado 1 (GEN3), Pescoço Pelado 2 (GEN4), Pescoço Pelado 3 (GEN5) and Pescoço Pelado 4 (GEN6). A total of 1584 sexed one day old chicks (792 males and 792 females) were housed in 48 pens, 33 birds per pen. The experimental design was a completely randomized factorial 2 x 6 (six genotypes and two sexes) design, with four replicates each. Diets were based on corn and soybean meal (no animal protein) provided in a feeding program in four phases: pre-starter (1 to 21 days), starter (22 to 42 days), growth (43 to 77 days) and finisher (78 to 91 days). Feed intake, feed conversion and livability were measured at 21, 42, 77 and 91 days of age. There was no genotype x sex interaction. The effect of sex was observed in all ages regarding weight gain, feed conversion (except at 21 days) and yields. For all these characteristics, males performed better than females, except in breast yield, which was higher in females. For the livability and feed conversion at 21 days no effect of sex was found. The effect of genotype was observed only in carcass and breast yields. The fast (GEN1) and intermediate (GEN2, GEN5 and GEN6) growing genotypes showed higher weight gain than the slow growing genotypes (GEN4 and GEN3). Carcass and breast yields of naked neck genotypes (GEN3, GEN4, GEN5 and GEN6) did not differ among themselves, and were higher than the Carijó genotype (GEN2) and are therefore recommended for production systems that sell industrialized birds.

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