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This study was designed to compare of laying performance, egg quality and bone characteristics of commercial and Türk laying hen genotypes kept in free-range system. A total of 720 laying hens (Atabey, Lohmann White, Atak-S, Lohmann Brown; n=180 hens/genotype) were used in the experiment. Production performance was determined as the mean of egg production, egg weight, and FCR value between 54 and 66 weeks of age. Egg quality parameters and bone characteristics of tibia and femur were measured at 66 weeks of age. The mean value of egg production was found to be higher in Lohmann Brown and Lohmann White genotypes compared to Atak-S and Atabey genotypes between 54 and 66 weeks of age (P

This study was designed to compare of laying performance, egg quality and bone characteristics of commercial and Türk laying hen genotypes kept in free-range system. A total of 720 laying hens (Atabey, Lohmann White, Atak-S, Lohmann Brown; n=180 hens/genotype) were used in the experiment. Production performance was determined as the mean of egg production, egg weight, and FCR value between 54 and 66 weeks of age. Egg quality parameters and bone characteristics of tibia and femur were measured at 66 weeks of age. The mean value of egg production was found to be higher in Lohmann Brown and Lohmann White genotypes compared to Atak-S and Atabey genotypes between 54 and 66 weeks of age (P<0.01). The brown eggs obtained from (Lohmann Brown, Atak-S) genotypes tended to be heavier than the white hen genotypes (Lohmann White, Atabey). The lowest mean value of FCR was observed in Lohmann White hens ranged from during the experimental period. The Lohmann Brown and Atak-S eggs obtained from (3.350 g/cm2 and 3.300 g/cm2) had a stronger shell strength compared to the Lohmann White and Atabey (2.847 g/cm2 and 2.910 g/cm2, P<0.01). The breaking strength of tibia was found to be higher in brown hens (366.0 N and 381.2 N) than white hens (267.0 N and 322.2 N) (P<0.01). These findings related to different genotypes could be instructive for arranging new management rules and nutritional advice for stronger eggshell and bone strength of hens in free range system. [ABSTRACT FROM AUTHOR]

This study was examined to investigate the effect of Azomite (AZO) on the growth performance, immune function, and bone mineralization of broiler chickens. A total of 240-d old male chicks were randomly assigned into four treatments with six replicates (n = 10), which included control (basal diet), basal diet +0.25% AZO, basal diet + 0.50% AZO and basal diet + kitasamycin as antibiotic growth promoter (AGP). The results indicate that live body weight (LBW), average daily gain (ADG) and feed conversion ratio (FCR) were significantly (p <.05) improved in AZO 0.25% and 0.50% than the control. The weight of bursa of Fabricus was significantly (p <.05) higher in AZO-0.25% and AZO-0.50% than control. Total protein (TP), globulin, IgA and IgG levels were significantly (p <.05) increased with AZO supplemented treatments. Tibia diameter tibia breaking strength was significantly (p <.05) increased in AZO- 0.25% and AZO-0.50% treatment. In conclusion, the results indicated that addition of AZO at the doses of 0.25% and 0.50% in the diet had beneficial effects on growth performance, immune functions and tibia breaking strength. [ABSTRACT FROM AUTHOR]

The aim of this study was to see how spray-dried plasma (SDP) supplementation affected broiler chicken performance, intestinal permeability, and bone strength during persistent heat stress. One-day-old chicks (n = 480) were randomly assigned into twelve environmental corrals; four thermoneutral (TN-negative control, maintained at 24 °C from d 21–42); four heat stress (HS, exposed to 35 °C from d 21–42); and four heat stress treated with 2% SDP in the feed until d 28 followed by 1% SDP until d 42 (HS-SDP). The performance and serum levels of fluorescein isothiocyanate-dextran (FITC-d) were evaluated at d 21, 28, 35, and 42. The tibias strength was evaluated on d 21 and 42. The increment in chicken temperature (p < 0.05) was observed two h following the increase in environmental temperature in both HS groups and was associated with decreased performance parameters compared with the TN group. At d 42 of age, the chickens exposed to HS had an impaired gut permeability and decreased tibia strength compared to the TN group (p < 0.05). However, partially feeding SDP mitigated these adverse effects significantly. These findings imply that using SDP strategically during stressful times, such as prolonged heat stress, may help mitigate its negative consequences.

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Simple Summary: Broilers are especially heat sensitive because of the absence of sweat glands and their elevated metabolism. Under commercial conditions, extremely high temperatures (heat stress) reduce their performance. This research aimed to assess spray-dried feeding plasma (SDP) during constant heat stress (HS) on the performance, intestinal permeability, and bone strength in broilers. Chickens fed with a diet supplemented with SDP increased both their body weight and body weight gain compared to the HS control group. At the end of the study (d 42 of age), chickens fed with SDP significantly alleviated the increased gut leakage induced by HS and showed a significant increase in tibia strength compared with control HS chickens. The results in the present study suggest SDP mends gut integrity, hence reducing chronic systemic inflammation. The aim of this study was to see how spray-dried plasma (SDP) supplementation affected broiler chicken performance, intestinal permeability, and bone strength during persistent heat stress. One-day-old chicks (n = 480) were randomly assigned into twelve environmental corrals; four thermoneutral (TN-negative control, maintained at 24 °C from d 21–42); four heat stress (HS, exposed to 35 °C from d 21–42); and four heat stress treated with 2% SDP in the feed until d 28 followed by 1% SDP until d 42 (HS-SDP). The performance and serum levels of fluorescein isothiocyanate-dextran (FITC-d) were evaluated at d 21, 28, 35, and 42. The tibias strength was evaluated on d 21 and 42. The increment in chicken temperature (p < 0.05) was observed two h following the increase in environmental temperature in both HS groups and was associated with decreased performance parameters compared with the TN group. At d 42 of age, the chickens exposed to HS had an impaired gut permeability and decreased tibia strength compared to the TN group (p < 0.05). However, partially feeding SDP mitigated these adverse effects significantly. These findings imply that using SDP strategically during stressful times, such as prolonged heat stress, may help mitigate its negative consequences. [ABSTRACT FROM AUTHOR]