Age and sex related changes in fattening performance, dermatitis, intestinal histomorphology, and serum IgG level of slow- and fast-growing broilers under the intensive system

Akyüz, Hilal Çapar; Onbaşılar, Esin Ebru; Bayraktaroğlu, Alev Gürol; Ceylan, Ahmet

doi:10.1007/s11250-022-03315-3

Cited by 7 publications

(10 citation statements)

References 28 publications

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“…Calcium and phosphorus levels were determined using ICP‐OES (Varian Vista MPX CCD Simultaneous ICP‐OES). The study lasted 10 weeks (Akyüz et al., 2022 ).…”

Section: Methodsmentioning

confidence: 99%

Tibia properties in broilers raised on their own commercial diets with different growth rates and sex during a 10‐week rearing period

Çapar Akyüz,

Onbaşılar,

Yalçın

2024

Veterinary Medicine & Sci

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BackgroundGenetic selection applied to broilers results in fast growth and an increase in meat yield. However, this situation causes welfare problems in broilers.ObjectivesThe aim of this study is to determine the weekly changes in the tibia characteristics in broilers raised on their own commercial diets.MethodsIn the study, 168 (84 female and 84 male) slow‐growing (Hubbard‐Isa Red JA) and 168 (84 female and 84 male) fast‐growing (Ross‐308) day‐old broiler chicks were used. Six broilers from each genotype and sex group were weighed weekly and slaughtered to determine the tibia properties during the 10‐week fattening period.ResultsFast‐growing broilers had higher tibia weight and longer length, diaphysis diameter and medullary canal diameter than those of slow‐growing broilers at the same age. In fast‐growing genotypes, the cortical index was low only in the 2nd week, and Robusticity and Seedor indices were observed to be better throughout the whole fattening. The ash content of the total tibia in the fast‐growing broilers was higher in all of the examined weeks except the 4th week and the 9th week of fattening than that in the slow‐growing broilers. Although the amount of ash per unit body weight in the 1st week of fattening was higher in fast‐growing broilers, this situation reversed after the 4th week. The level of all minerals examined in total tibia weight is high in fast‐growing broilers, and they differed according to the fattening period.ConclusionsWhen comparing tibia characteristics of two different genotypes fed their own commercial diets, the tibia structure was found to be stronger in fast‐growing broilers compared to other genotypes at the same age, but slow‐growing broilers were more prominent in terms of body weight. It was observed that the mineral density was higher in male broilers, except in the 1st week.

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“…Calcium and phosphorus levels were determined using ICP‐OES (Varian Vista MPX CCD Simultaneous ICP‐OES). The study lasted 10 weeks (Akyüz et al., 2022 ).…”

Section: Methodsmentioning

confidence: 99%

Tibia properties in broilers raised on their own commercial diets with different growth rates and sex during a 10‐week rearing period

Çapar Akyüz,

Onbaşılar,

Yalçın

2024

Veterinary Medicine & Sci

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“…All procedures used in the present study were approved by the Ethic Committee of the Ankara University (2018-6-44). In the study, samples were taken from slow (Hubbard-Isa Red JA) and fast growing (Ross-308) female and male genotypes reared under the intensive conditions (Çapar Akyüz et al, 2022) until 10 weeks of age. Every week during the fattening period, six broilers from each genotype and sex groups were slaughtered.…”

Section: Methodsmentioning

confidence: 99%

Carcass, visceral organ, and meat quality properties of two broiler hybrids differing in growth rates

Akyüz,

Onbaşılar

2023

Animal Science Journal

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This study aimed to determine the carcass, visceral organ, and meat properties according to the sex in slow growing broilers (SGB) and fast growing broilers (FGB). Six broilers from each genotype and sex group were slaughtered every week. It was determined that the difference between SGB and FGB in terms of carcass yield occurred at the highest level at 5 weeks and this difference continued until the age of 10 weeks. The weight percentages of all visceral organs examined in FGB were lower than in SGB. Higher values of pH, lightness, and cooking loss were determined in breast and thigh meat of FGB compared with SGB (P < 0.05). The effects of genotype on protein levels of breast and leg meats were found to be insignificant. The fat level in breast meat was insignificant between genotypes after the fifth week of fattening period. There was no difference between the sexes regarding meat quality in both genotypes. When FGB and SGB were reared under the intensive conditions for 10 weeks, it was observed that visceral organs developed in harmony with body weight, especially in SGB during the 10 weeks of fattening period and SGB maintained their superiority in terms of meat quality.

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“…For example in some studies birds were sequentially killed to assess post-mortem welfare indicators, resulting in sharp declines in group size and stocking density as each study progressed (e.g. Williams et al, 2013;Sarica et al, 2014;Akyuz et al, 2022). Declines in stocking density during a trial can also occur if there is high bird mortality with no replacement.…”

Section: Structure Of Narrative Review and Source Materialsmentioning

confidence: 99%

“…Bokkers and Koene, 2003;Cavusoglu and Petek, 2019;Steenfeldt et al, 2019;Baxter et al, 2021;Petek, 2022, Abdourhamane andPetek, 2023), likely containing nutrient levels beyond those needed by SG birds and not fully representing the commercial situation. A different strategy was to provide an intermediate diet (Malchow et al, 2019b, Malchow et al, 2019c or non-identical diets, so that FG birds received higher energy/nutrient diets than SG birds for part or all of the growing period (Comert et al, 2016;Akyuz et al, 2022) (Supplementary Table 1). If there is a positive interaction between genetic susceptibility to poor welfare outcomes and dietary energy level then the greatest difference in welfare outcomes between strains would be expected in these studies.…”

Section: Studies Comparing Fg and Sg Strains: Birds Kept To The Same Agementioning

confidence: 99%

An analysis of the welfare of fast-growing and slower-growing strains of broiler chicken

Nicol,

Abeyesinghe,

Chang

2024

Front. Anim. Sci.

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Due to concerns about the welfare of fast-growing (FG) strains of broiler chicken, animal welfare organisations have advocated the use of certain slower-growing (SG) strains that meet key welfare targets under test conditions. However, a widespread transition to SG strains could negatively affect sustainability because these birds tend to have higher feed conversion ratios and longer production cycles. It is important therefore to review the extent and limits of SG welfare improvements under test conditions and on commercial farms, to support the best policy decisions. Following a systematic literature search, 63 source papers were identified. Most reported comparative welfare outcomes for at least one SG strain with at least one FG counterpart, whilst a minority examined the suitability of various SG strains for niche production. The literature review considered different types of study design and accounted for confounding factors such rearing environment and diet. Additionally, a quantitative analysis of effect size for mortality, gait score and contact dermatitis was conducted across studies that had compared birds under similar rearing conditions and that had used SG strains with an average daily growth rate of at least 40g/day. Modern, commercial SG strains performed better on most relevant welfare traits than FG strains. This was the case even when the ‘fairest’ comparisons were made at equivalent bodyweights (when SG birds were older), under matched-environmental conditions, experimentally or on farm. The quantitative analysis found that FG strains had a higher estimated incidence rate ratio for mortality (risk of death over a given period of time) of between 1.69 and 2.16, contact dermatitis affecting 15-25% more birds, and a mean gait score 0.65 points higher than SG strains. FG strains were also less active but other differences in behaviour were inconsistent with some behaviours (e.g. dustbathing) often absent altogether. Growth rate was generally, but not always, predictive of welfare problems. Alternative strategies, such as the slaughter of birds prior to the onset of any welfare decline, could be evaluated in future in terms of welfare improvement and efficiency of production.

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Age and sex related changes in fattening performance, dermatitis, intestinal histomorphology, and serum IgG level of slow- and fast-growing broilers under the intensive system

Cited by 7 publications

References 28 publications

Tibia properties in broilers raised on their own commercial diets with different growth rates and sex during a 10‐week rearing period

Tibia properties in broilers raised on their own commercial diets with different growth rates and sex during a 10‐week rearing period

Carcass, visceral organ, and meat quality properties of two broiler hybrids differing in growth rates

An analysis of the welfare of fast-growing and slower-growing strains of broiler chicken

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