In pursuit of a better broiler: tibial morphology, breaking strength, and ash content in conventional and slower-growing strains of broiler chickens

Santos, Midian Nascimento dos; Widowski, Tina M.; Kiarie, E.; Guerin, Michele T.; Edwards, A. Michelle; Torrey, Stephanie

doi:10.1016/j.psj.2022.101755

Cited by 10 publications

(9 citation statements)

References 77 publications

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“…Although these diseases are widespread and affect the entire skeleton, they first and most severely affect trabecular bone tissue where the speed of bone synthesis and resorption is higher (Krook, 1983), being necessary to target these bones when applying imaging analysis. In addition, TD is an alteration of bone growth that is not always linked to a decreased bone resistance when using a 3-point bending test (Santos et al, 2022) as the one used in this study. However, TD can develop concurrently with epiphysiolysis, where the degenerated and necrotic epiphyseal plate causes fissures that leads epiphysis and diaphysis to separate.…”

Section: Discussionmentioning

confidence: 99%

Performance and bone health of broilers reared under artificial lighting and supplemented with different levels of vitamin D3

Lopes,

Vasconcelos,

Costa

et al. 2024

Revista Brasileira De Zootecnia

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This study aimed to investigate the effects of different levels of vitamin D 3 in broiler diets on performance and bone health. A total of 360 one-day old male Cobb500 ® broiler chicks were subjected to five treatments of different levels of vitamin D 3 in diets during two rearing phases: 0 IU/kg in both phases; 625 IU/kg in starter and 500 IU/kg in grower phase (25% of commercial inclusion); 1,250 IU/kg in starter and 1,000 IU/kg in grower phase (50% of commercial inclusion); 1,875 IU/kg in starter and 1,500 IU/kg in grower phase (75% of commercial inclusion); and 2,500 IU/kg in starter and 2,000 IU/kg in grower phase (100% of commercial inclusion). The traits studied weekly were feed intake, body weight, feed conversion, and viability. At 21 and 35 days of age, tibiae and femurs were removed, dissected, and evaluated for dry matter (DM), ash (%MM), calcium (%Ca), phosphorus (%P) and breaking strength. At 35 days of age, the bones were subjected to histopathological analysis for macroand microscopic morphological evaluation. Data were subjected to regression analysis, using α = 0.05. The variables of percentage %MM, %Ca, %P, and breaking strength experienced a positive linear effect up to the supplementation levels of approximately 25% of inclusion. The histopathological analysis found that the group that received the diet with 100% inclusion of vitamin D 3 presented lesions compatible with osteopetrosis and tibial dyschondroplasia. The observed results showed that for isonutritive diets, reduced levels of vitamin D 3 guaranteed performance during the evaluated period while the use of 100% of vitamin D 3 , as commonly used, can cause bone diseases and harm the welfare of broilers.

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Section: Discussionmentioning

confidence: 99%

Performance and bone health of broilers reared under artificial lighting and supplemented with different levels of vitamin D3

Lopes,

Vasconcelos,

Costa

et al. 2024

Revista Brasileira De Zootecnia

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“…Bone assessment was done according to the procedures of Santos et al (2022) . The tibia and femur length measurements were taken, starting from the lateral intercondylar tubercle and extending to the inferior articular surface.…”

Section: Methodsmentioning

confidence: 99%

Response of broiler breeder pullets when fed hydrolyzed whole yeast from placement to 22 wk of age

Maina,

Schulze,

Kiarie

2024

Poultry Science

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“…An ambitious series of studies was conducted at a research facility in Canada, to compare conventional and SG strains of broiler chickens reared under standardised conditions (Dawson et al, 2021;Santos et al, 2022a, Santos et al, 2022bTorrey et al, 2021). Overall, 16 anonymised strains were assessed, three conventional and 13 SG.…”

Section: Canada Studiesindoor Pensmentioning

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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In pursuit of a better broiler: tibial morphology, breaking strength, and ash content in conventional and slower-growing strains of broiler chickens

Cited by 10 publications

References 77 publications

Performance and bone health of broilers reared under artificial lighting and supplemented with different levels of vitamin D3

Performance and bone health of broilers reared under artificial lighting and supplemented with different levels of vitamin D3

Response of broiler breeder pullets when fed hydrolyzed whole yeast from placement to 22 wk of age

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

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