Effects of dietary roxarsone supplementation, lighting program, and season on the incidence of leg abnormalities in broiler chickens

Laster, CP; Fj, Hoerr; Bilgili, S. F.; Kincaid, S. A.

doi:10.1093/ps/78.2.197

Cited by 10 publications

(3 citation statements)

References 37 publications

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“…Despite examining a fuller range of husbandry and management practices than previous surveys, we did not identify many novel or previously unreported risks. An effect of season has been noted before in the US, where a higher percentage of leg abnormalities was reported in the summer [25] . The strong genotype effect that we found, confirms the important genetic component to leg disorders, and many of the husbandry effects detected most likely alter levels of leg disorder through direct or indirect effects on growth rate.…”

Section: Discussionsupporting

confidence: 58%

Leg Disorders in Broiler Chickens: Prevalence, Risk Factors and Prevention

et al. 2008

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Broiler (meat) chickens have been subjected to intense genetic selection. In the past 50 years, broiler growth rates have increased by over 300% (from 25 g per day to 100 g per day). There is growing societal concern that many broiler chickens have impaired locomotion or are even unable to walk. Here we present the results of a comprehensive survey of commercial flocks which quantifies the risk factors for poor locomotion in broiler chickens. We assessed the walking ability of 51,000 birds, representing 4.8 million birds within 176 flocks. We also obtained information on approximately 150 different management factors associated with each flock. At a mean age of 40 days, over 27.6% of birds in our study showed poor locomotion and 3.3% were almost unable to walk. The high prevalence of poor locomotion occurred despite culling policies designed to remove severely lame birds from flocks. We show that the primary risk factors associated with impaired locomotion and poor leg health are those specifically associated with rate of growth. Factors significantly associated with high gait score included the age of the bird (older birds), visit (second visit to same flock), bird genotype, not feeding whole wheat, a shorter dark period during the day, higher stocking density at the time of assessment, no use of antibiotic, and the use of intact feed pellets. The welfare implications are profound. Worldwide approximately 2×1010 broilers are reared within similar husbandry systems. We identify a range of management factors that could be altered to reduce leg health problems, but implementation of these changes would be likely to reduce growth rate and production. A debate on the sustainability of current practice in the production of this important food source is required.

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Section: Discussionsupporting

confidence: 58%

Leg Disorders in Broiler Chickens: Prevalence, Risk Factors and Prevention

et al. 2008

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“…Body weight gain in chicks exposed to intermittent lighting was greater than that exposed to either continuous or constant lighting program, the differences in this respect, were significant (P<0.01) during 4-7 and significant (P<0.05) during 1-7 between intermittent and constant lighting programs (Table 2). This finding agree with the results of Al-Homidan (1994), Renden et al (1996), Laster et al, (1999) and Othani and Lesson (2000). El-Neney (2003) showed that under intermittent light birds had significantly heavier body weight than those of continuous light and constant light.…”

Section: Live Body Weight and Weight Gainsupporting

confidence: 93%

Improving Productive and Physiological Parameters of Broilers Using Some Light Regimes and Feed Additives

2006

Egyptian Journal of Animal Production

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A total number of 360 one-day-old unsexed broiler chicks (Arbor Acres) was used in a 42-day experiment to investigate the effect of lighting regimes and Bio-Tonic level in diet on chick performance. Chicks were randomly divided into three equal groups according to light regimes: (L1) continuous (23L:1D), (L2) constant (15L:9D) and (L3) intermittent(8L:4D:8L:4D). Each light program was divided into four groups according to level of Bio-Tonic in diet as follow, (B1) 0.0, (B2) 0.5, (B3) 1.0 and (B4) 1.5 kg/ton diet. Chicks exposed to intermittent lighting had significantly higher (P<0.05 or P<0.01) live body weight at 7 weeks of age and body gain during 4-7 and 1-7 week periods than those exposed to continuous or constant lighting program. Chicks fed on B4 had significantly (P<0.01) higher body weight at 7 wks than those fed on other diets at all ages studied. The differences among Bio-Tonic levels in body weight at 7 weeks and body gain during 1-7 week period were highly significant (P<0.01). Feed consumption and feed conversion ratio of continuous lighting were significantly (P<0.05 or P<0.01) greater than those of either constant or intermittent lighting treatments at all ages studied. The birds fed on B1 had significantly higher (P<0.05) feed consumption and feed conversion ratio than those fed on other Bio-Tonic levels in diet during all periods studied. Chicks fed on B4 gave non-significantly greater percentages of dressing, liver, heart, gizzard and giblets than that fed on the other Bio-Tonic treatments. An opposite trend was true for abdominal fat % with B1 treatment. Birds exposed to constant lighting had ether extract % significantly (P<0.05) greater than those exposed to continuous and intermittent lighting programs. Chicks reared under intermittent gave significantly greater (P<0.05 or P<0.01) liver protein % and glycogen (mg/g) than that reared under both continuous and constant lighting programs. Chicks fed on B4 level had non-significantly lower liver lipids % than other levels, and had greater liver protein % and liver glycogen (mg/g) than the other Bio-Tonic levels. Plasma total lipids were insignificantly higher of constant than those continuous or intermittent lighting programs. The chicks fed on B4 level had plasma total lipids and cholesterol lower, and plasma total protein, albumin, alkaline phosphatase activity, GOT, T3, T4 and GH higher than that fed on the other levels of Bio-Tonic. There were significant differences (P<0.05 or P<0.01) due to interaction effect between light regimes and Bio-Tonic level in the diet on body weight at 4 and 7 wk; body gain during 4-7 and 1-7 wk periods; feed consumption during all periods studied; feed conversion ratio during 1-4 and 4-7 wk periods; E.E.%; liver protein %; percentages of dressing and abdominal fat and plasma total protein, albumin, cholesterol, T3 and GH.

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“…Petek et al (2005) have reported similar results. Contrary some researchers (Wilson et al, 1984;Laster et al, 1999;Ingram et al, 2000) showed that IL had significantly fewer and less severe skeletal diseases. This may be explained due to the positive correlation between TD and body weight (Su et al, 1999) and also may be due to the different slaughter ages.…”

Section: Discussionmentioning

confidence: 79%

Influence of Intermittent Lighting on Broiler Performance, Incidence of Tibial Dyschondroplasia, Tonic Immobility, Some Blood Parameters and Antibody Production

Onbaşılar¹,

Erol²,

Cantekin³

et al. 2007

Asian Australas. J. Anim. Sci

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The aim of this study was to determine the effect of two lighting programs (continuous lighting (CL) 24L:0D and intermittent lighting (IL) 1L:3D) on the broiler performance, carcass traits, incidence of tibial dyschondroplasia (TD), relative asymmetry (RA), duration of induced tonic immobility (TI), heterophils-lymphocytes ratio (H/L), serum glucose, cholesterol and triglyceride levels. The chicks were randomly divided into 2 treatment groups consisting of 100 chicks per treatment, continuous lighting (CL) 24L:0D or intermittent lighting (IL) 1L:3D. Each treatment consists of 5 replicates of 20 chicks. The experimental period was 6 weeks. Use of IL decreased feed to gain ratio, improved immune response and reduced fearful. Body weight, carcass traits, TD and stress parameters (organ weights, RA, H/L, glucose, cholesterol and triglyceride levels) were not significant in different lighting groups. As a result IL was beneficial for producers and chickens than CL.

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Effects of dietary roxarsone supplementation, lighting program, and season on the incidence of leg abnormalities in broiler chickens

Cited by 10 publications

References 37 publications

Leg Disorders in Broiler Chickens: Prevalence, Risk Factors and Prevention

Leg Disorders in Broiler Chickens: Prevalence, Risk Factors and Prevention

Improving Productive and Physiological Parameters of Broilers Using Some Light Regimes and Feed Additives

Influence of Intermittent Lighting on Broiler Performance, Incidence of Tibial Dyschondroplasia, Tonic Immobility, Some Blood Parameters and Antibody Production

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