The Role of Environment and Management on Leg Abnormalities in Meat-Type Fowl

Hester, Patricia Y.

doi:10.3382/ps.0730904

Cited by 91 publications

(48 citation statements)

References 78 publications

(107 reference statements)

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Leg disorders are a result of infection, developmental and degenerative conditions or combinations of these (Thorp, 1992). The causes of broiler lameness are therefore multifactorial and are affected by management factors and genetic differences between lines (Hester, 1994;Kestin et al, 1999;Reiter and Kutritz, 2001). Whereas modifications to the management of boiler chickens such as shorter photoperiods and limiting early growth rate may decrease the prevalence of skeletal disorders (Classen, 1992), genetic selection to decrease the propensity to develop skeletal disease will protect boiler chickens from these conditions and simplify management.…”

Section: Introductionmentioning

confidence: 97%

Quantifying genetic (co)variation and effects of genetic selection on tibial bone morphology and quality in 37 lines of broiler, layer and traditional chickens

Hocking

Sandercock

Wilson

et al. 2009

British Poultry Science

View full text Add to dashboard Cite

1. Tibial bone morphology and quality was assessed at 6, 8 and 10 weeks of age in 12 broiler, 12 layer and 13 traditional lines of chickens. 2. High intraclass correlations (0.65-0.96) were estimated for tibial weight, length, width, strength, stiffness, stress radiodensity, plateau angle but not for cortical width and tibial torsion at 6 and 10 weeks of age and for weight, length, width, strength radiodensity and plateau angle at 8 weeks of age. Lower intraclass correlations (0.4-0.8) were estimated within category (broiler, layer and traditional) for weight, length, width at 6, 8 and 10 weeks, and for stiffness, stress and radiodensity at 6 and 10 weeks, and were lower (<0.33) at 8 weeks of age. Intraclass correlations for tibial torsion angles were low (< or =0.4) at all ages. 3. Tibia from layers and traditional lines were similar suggesting that intensive genetic selection for high rates of egg laying has not changed bone size, shape or quality. Tibia from broilers, as expected, were heavier and larger and the differences were greatest at 6 weeks of age suggesting that the broilers were earlier maturing than layers and traditional lines. Broiler tibiae were more radiodense, stronger and stiffer and had lower stress values than bones from layers and traditional lines. Plateau angles were higher in broilers and torsion angles had higher external rotation compared with layers and traditional lines.

show abstract

Section: Introductionmentioning

confidence: 97%

Quantifying genetic (co)variation and effects of genetic selection on tibial bone morphology and quality in 37 lines of broiler, layer and traditional chickens

Hocking

Sandercock

Wilson

et al. 2009

British Poultry Science

View full text Add to dashboard Cite

show abstract

“…body weight with reduced physical activity in broilers remains unclear in literature (Hester, 1994).…”

Section: Photogrammetry: a Non-invasive And Objective Methods For Detementioning

confidence: 99%

Photogrammetry: a Non-Invasive and Objective Method for Detecting Locomotion Problems in Broiler Chickens

Mendes

Paixão

Sikorski

et al. 2016

Rev. Bras. Cienc. Avic.

View full text Add to dashboard Cite

Locomotion problems in broiler chickens can cause economic losses of up to 40% of the total revenues due to carcass condemnation and downgrading at processing. Leg disorders, such as femoral lesions, tibial dyschondroplasia, and spondylolisthesis, substantially impact the welfare of chickens as these disorders can prevent birds from reaching the feeders and drinkers, thus reducing feed and water intake. The most important issues related to broiler welfare reported in the last two decades are their growing sensitivity to metabolic and locomotion problems due to the fast growth rates and inactivity. Traditional methods for the determination of gait score include the manual scoring of animal behavior in the broiler house. Recorded video images can also be used for manual scoring of chicken gait score. However, scoring of some animal-based information by human experts and manual methods remain difficult, time consuming and expensive when implemented at farm level. In an effort to objectively detect leg disorders, this study aimed at validating the photogrammetry technique as a non-invasive method for identifying locomotion problems in broilers. Photogrammetry allows determining the geometric properties of broilers from digital photos that are processed and analyzed using a computer software. Results obtained using photogrammetry were tested for their correlation with those obtained by accepted methodologies, including gait score and macroscopic examination of femoral degeneration and tibial dyschondroplasia. The photogrammetry results agreed with the results of the afore mentioned accepted methods.

show abstract

“…Leg problems can result in a loss of 0·5% to 5% of a ock during the growing period and in the downgrading of carcases. Furthermore, there is increasing concern about the handling of broilers during catching and loading (Julian, 1986;Hester, 1994).…”

Section: Introductionmentioning

confidence: 99%

Influence of dietary protein and sex on walking ability and bone parameters of broilers

Yalçın¹,

Settar²,

Dicle³

1998

British Poultry Science

View full text Add to dashboard Cite

1. The study was conducted to investigate the effect of dietary protein on the walking ability and bone parameters of broilers reared under summer temperatures which ranged from 26 degrees to 32 degrees C (+/- 2 degrees C). 2. Three different dietary protein combinations were used. The diets (per kg) were: low protein with 205 g crude protein and 12.94 MJ ME, 184 g crude protein and 12.75 MJ ME; medium protein with 219 g crude protein and 12.99 MJ ME, 201 g crude protein and 12.87 MJ ME; and high protein with 238 g crude protein and 12.99 MJ ME, 216 g crude protein and 12.96 MJ ME from 0 to 4 and 4 to 7 weeks of age, respectively. Body weights of birds were recorded and birds' walking ability (gait scoring) were scored for each bird, according to 3 categories (completely normal to immobile, at 4 and 7 weeks). Tibia parameters and tibia plateau angles were also determined at 7 weeks. 3. Birds fed on the low protein were lighter than those fed on the medium or high protein diets. At 7 weeks, birds with poor walking ability weighted 149 g less than birds with no walking difficulty. 4. Bone parameters were not affected by dietary protein, sex or gait score. There was a significantly positive correlation between bone strength and radiographic density. Bone strength was also significantly correlated with bone weight and length.

show abstract

The Role of Environment and Management on Leg Abnormalities in Meat-Type Fowl

Cited by 91 publications

References 78 publications

Quantifying genetic (co)variation and effects of genetic selection on tibial bone morphology and quality in 37 lines of broiler, layer and traditional chickens

Quantifying genetic (co)variation and effects of genetic selection on tibial bone morphology and quality in 37 lines of broiler, layer and traditional chickens

Photogrammetry: a Non-Invasive and Objective Method for Detecting Locomotion Problems in Broiler Chickens

Influence of dietary protein and sex on walking ability and bone parameters of broilers

Contact Info

Product

Resources

About