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British Poultry Science

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https://www.readbyqxmd.com/read/28817948/effects-of-dietary-supplementation-of-resveratrol-on-performance-egg-quality-yolk-cholesterol-and-antioxidant-enzyme-activity-of-laying-hens
#1
Z H Feng, J G Gong, G X Zhao, X Lin, Y C Liu, K W Ma
1. This experiment was conducted to evaluate the effects of dietary supplementation of resveratrol on laying performance, egg quality, egg yolk cholesterol and antioxidant enzyme activities of laying hens. 2. A total of 360 Beijing PINK-1 laying hens (60 weeks old) were randomly distributed among 5 dietary treatments, each of which included 6 replicates of 12 hens. Dietary treatments were basal diet supplemented with 0 (control), 0.5, 1.0, 2.0 and 4.0 g/kg diet resveratrol. The study lasted for 9 weeks including 1 week of adaptation and 8 weeks of the main experimental period...
August 18, 2017: British Poultry Science
https://www.readbyqxmd.com/read/28812373/evaluation-of-factors-in-development-of-vis-nir-spectroscopy-models-for-discriminating-pse-dfd-and-normal-broiler-breast-meat
#2
Hongzhe Jiang, Seung-Chul Yoon, Hong Zhuang, Wei Wang, Yi Yang
1. To evaluate the performance of visible and near-infrared (Vis/NIR) spectroscopic models for discriminating true pale, soft and exudative (PSE), normal and dark, firm and dry (DFD) broiler breast meat in different conditions of preprocessing methods, spectral ranges, characteristic wavelengths selection and water-holding capacity (WHC) indexes. 2. Quality attributes of 214 intact chicken fillets (pectoralis major), such as lightness (L*), pH, and WHC indicators including drip loss (DL), water gain (WG), and expressible fluid (EF) were measured...
August 16, 2017: British Poultry Science
https://www.readbyqxmd.com/read/28738689/spermatozoa-dna-and-plasma-membrane-integrity-after-pellet-optimized-processing-for-cryopreservation-in-meat-type-chicken-breeders
#3
T M Gliozzi, L Zaniboni, N Iaffaldano, S Cerolini
1. Aim of this study was the development of an optimised cryopreservation pellet procedure for chicken semen and the assessment of DNA and membrane integrity in frozen/thawed spermatozoa in a Hubbard F15 meat type selected strain. 2. The following semen processing conditions were studied: spermatozoa working concentration (SWC), 1.5 vs 2 × 10(9) cells/ml in pre-freezing extender; equilibration of diluted semen at 5°C, 20 vs 40 min; dimethylacetamide concentration, 6% vs 9%; dimethylacetamide equilibration time at 5°C, 1 vs 30 min; thawing at 60°C for 10 vs 50°C for 30 sec...
August 16, 2017: British Poultry Science
https://www.readbyqxmd.com/read/28728428/consequence-of-dopamine-d2-receptor-blockade-on-the-hyperphagic-effect-induced-by-cannabinoid-cb1-and-cb2-receptors-in-layers
#4
M Khodadadi, M Zendehdel, A Baghbanzadeh, V Babapour
1. Endocannabinoids (ECBs) and their receptors play a regulatory function on several physiological processes such as feed-intake behaviour, mainly in the brain. This study was carried out in order to investigate the effects of the dopaminergic D1 and D2 receptors on CB1/CB2 ECB receptor-induced hyperphagia in 3-h feed-deprived neonatal layer chickens. 2. A total of 8 experiments were designed to explore the interplay of these two modulatory systems on feed intake in neonatal chickens. In Experiment 1, chickens were intracerebroventricular (ICV) injected with control solution, l-DOPA (levo-dihydroxyphenylalanine as precursor of dopamine; 125 nmol), 2-AG (2-arachidonoylglycerol as CB1 receptor agonist; 2 µg) and co-administration of l-DOPA (125 nmol) plus 2-AG (2 µg)...
August 16, 2017: British Poultry Science
https://www.readbyqxmd.com/read/28805451/genetic-characterisation-and-analysis-of-infectious-bronchitis-virus-isolated-from-brazilian-flocks-between-2010-and-2015
#5
Claudia Carranza, Claudete S Astolfi-Ferreira, Silvana H Santander Parra, Luis F N Nuñez, Zoltan Penzes, Jorge L Chacón, Luiz Sesti, Ruy D Chacón, Antonio J Piantino Ferreira
Infectious bronchitis virus (IBV) variants in Brazil were isolated during 2010-2015 for epidemiological and molecular analysis to characterise the different variants and perform a bioinformatic analysis to compare with sequences of variants collected over the previous 40 years. Of the 453 samples examined, 61.4% were positive for IBV and 75.9% of these were considered to have the BR-I genotype and were detected in birds of all ages distributed in all five Brazilian regions. The ratio of non-synonymous substitutions per non-synonymous site (dN) to synonymous substitutions per synonymous site (dS), i...
August 14, 2017: British Poultry Science
https://www.readbyqxmd.com/read/28805077/relevance-of-age-at-slaughter-on-meat-quality-of-turkeys-stunned-with-co2
#6
S Mauri, Á Guijarro, F Peña, V Domenech, C Avilés
1. The objective of this work was to determine the effect of slaughter age and stunning method on the quality of turkey meat from poultry processing plants. 2. One hundred B.U.T. Premium turkeys were divided into 4 groups of 25 animals according to slaughter age (15 or 17 weeks) and CO2 stunning procedure (G1 stepwise: step1: 30% CO2, 15 s; step 2: 55% CO2, 40 s; step 3: 70% CO2, 45 s; G2: progressive increase of the CO2 concentration at a rate of 0.8% per s for 100 s). The quality of the breast meat was determined in fillets taken at different post-mortem times...
August 14, 2017: British Poultry Science
https://www.readbyqxmd.com/read/28805076/assessing-serum-metabolite-profiles-as-predictors-for-feed-efficiency-in-broiler-chickens-reared-at-geographically-distant-locations
#7
B U Metzler-Zebeli, E Magowan, M Hollmann, M E E Ball, A Molnár, P G Lawlor, R J Hawken, N E O'Connell, Q Zebeli
1. The objective of this study was to investigate differences in growth performance, serum intermediary metabolites, acute-phase-proteins and white blood cells in low, medium and high residual feed intake (RFI) chickens. It was also assessed if the environment affects the FE and FE-related performance and serum profiles of chickens. Individual BW and feed intake (FI) were recorded from d 7 of life. At 5 weeks of age, female and male broiler chickens (Cobb 500) were selected according to their RFI (L1: Austria; L2: UK; n = 9/RFI group, sex and location) and blood samples were collected...
August 14, 2017: British Poultry Science
https://www.readbyqxmd.com/read/28792239/improving-the-nutritional-quality-and-shelf-life-of-broiler-meat-by-feeding-diets-supplemented-with-fermented-pomegranate-punica-granatum-l-by-products
#8
S T Ahmed, S-Y Ko, C-J Yang
1. Four experimental diets containing 0, 0.5, 1.0 and 2.0% fermented pomegranate by-products (FPB) were supplied to 320 day-old broilers to evaluate the effects of FPB on growth performance, nutritional composition, fatty acid profile and oxidative stability of meat. 2. Dietary supplementation of FPB linearly increased the weight gain and feed intake of broilers with linear reduction in feed conversion ratio. 3. The crude protein, iron, magnesium, and sodium content were linearly higher, whereas cholesterol was linearly lower in the breast meat of FPB supplemented broilers...
August 9, 2017: British Poultry Science
https://www.readbyqxmd.com/read/28777016/threonine-supplementation-reduces-dietary-protein-and-improves-lipid-metabolism-in-pekin-ducks
#9
Y Jiang, J Tang, M Xie, Z G Wen, S Y Qiao, S-S Hou
1. This study was conducted to investigate the efficiency of threonine (Thr) supplementation on reducing dietary crude protein (CP) content and the effects of Thr on lipid metabolism in Pekin ducks. The effects of dietary CP concentration (160, 190, and 220 g/kg) and Thr supplemental concentration (0, 0.7, 1.4, 2.1, and 2.8 g/kg) on growth performance, carcass, liver lipid, and plasma profiles was determined in Pekin ducks from 1-21 d of age. 2. A total of 720 day-old male Pekin ducks were randomly allotted to 1 of 15 dietary treatments with 6 replicate cages of 8 birds per cage for each treatment according to average body weight...
August 4, 2017: British Poultry Science
https://www.readbyqxmd.com/read/28752767/differential-expression-of-fatty-acid-transporters-and-fatty-acid-synthesis-related-genes-in-crop-tissues-of-male-and-female-pigeons-columba-livia-domestica-during-incubation-and-chick-rearing
#10
P Xie, X-P Wan, Z Bu, X-T Zou
1. The growth performance of squabs reared solely by male or female parent pigeons was measured and the changes of lipid content of crop milk and the expression profiles of genes potentially involved in lipid accumulation by crop tissues of parent pigeons, were evaluated during incubation and chick rearing. 2. Squabs increased in body weight during 25 d of rearing, whereas both male and female pigeons lost weight after finishing rearing chicks, and the weight loss of male pigeons was significantly greater than that of female parent pigeons...
July 28, 2017: British Poultry Science
https://www.readbyqxmd.com/read/28117599/influence-of-carbon-dioxide-stunning-procedure-on-quality-of-turkey-meat
#11
S Mauri, A Guijarro, C Avilés, F Peña
1. The objective of this study was to evaluate the effect of sex and gas stunning on quality attributes of turkey breast meat. 2. One hundred B.U.T. Premium turkeys (50 males and 50 females) were divided into four groups of 25 animals and subjected to one of two CO2 stunning procedures: G1 stepwise (step 1: 30% CO2, 15 s; step 2: 55% CO2, 40 s; step 3: 70% CO2, 45 s) or G2 fixed concentration (80% CO2, 100 s). The pH and meat colour at 20 min post-mortem, and pH, colour (L*, a*, b*), water holding capacity (WHC), drip loss (DL), cooking loss (CL) and Warner-Bratzler shear force (WBSF) in breast samples at 24 h and 7 d post-mortem were assessed...
July 26, 2017: British Poultry Science
https://www.readbyqxmd.com/read/28418277/geographical-variation-in-the-skeletal-morphology-of-red-jungle-fowl
#12
H Endo, N Tsunekawa, M Sonoe, Tї Sasaki, H Ogawa, T Amano, T S Nguyen, V Phimphachanhvongsod, K Kudo, T Yonezawa, F Akishinonomiya
1. The skulls and postcranial skeletons of the red jungle fowl (Gallus gallus) were compared osteometrically between the populations from North and South Vietnam, North and Central Laos and Southeast Bangladesh. The populations include the three subspecies of G. g. spadiceus, G. g. gallus and G. g. murghi and were sampled to reveal the geographical morphological variations among populations in G. gallus. 2. The morphometric characteristics of subspecies murghi could be clearly distinguished from those of the other subspecies using a canonical discriminant analysis...
July 13, 2017: British Poultry Science
https://www.readbyqxmd.com/read/28699767/achieving-sustainable-production-of-poultry-meat-volume-1-safety-quality-and-sustainability
#13
Hervé Remignon
No abstract text is available yet for this article.
July 12, 2017: British Poultry Science
https://www.readbyqxmd.com/read/28692350/the-muscular-dystrophic-chicken-is-hypernatremic
#14
N Saito, H Hirayama, K Yoshimura, Y Atsumi, M Mizutani, K Kinoshita, A Fujiwara, T Namikawa
1. The WWP1 gene, the mutation of which causes muscular dystrophy in chickens, is expressed not only in the pectoral muscle, but also in a number of tissues such as the kidney. Therefore, this study examined some parameters related to kidney function in muscular dystrophic (MD) chickens. 2. Plasma osmolality, Na(+) and K(+) concentrations, aldosterone levels, and the expression of aquaporin (AQP) 2, AQP3, and α subunits of the amiloride-sensitive epithelial sodium channel (αENaC) were analysed in the kidneys of 5-week-old MD chickens and White Leghorn (WL) chickens under physiological conditions or after one day of water deprivation...
July 10, 2017: British Poultry Science
https://www.readbyqxmd.com/read/28682111/performance-gut-morphology-and-microbiology-effects-of-a-bacillus-probiotic-avilamycin-and-their-combination-in-mixed-grain-broiler-diets
#15
A L Wealleans, M Sirukhi, I A Egorov
1. This study aimed to determine the effect of avilamycin (AGP) and a multi-strain Bacillus probiotic (DFM) on the performance, gut histology and microbiology of broilers fed on a mixed grain diet. 2. A total of 800 chicks were allocated to four treatments: a control diet, control+AGP, control+DFM, or control+AGP+DFM. Bodyweight, feed intake and FCR were measured at d 0, 21 and 42. Samples were taken at d42 to determine villus height (VH), crypt depth (CD) and ratio (VH:CD). Mucosal E. coli and Lactobacilli counts were measured at d42...
July 10, 2017: British Poultry Science
https://www.readbyqxmd.com/read/28682120/comparison-of-the-effects-of-dietary-supplementation-of-flavonoids-on-laying-hen-performance-egg-quality-and-egg-nutrient-profile
#16
H Iskender, G Yenice, E Dokumacioglu, O Kaynar, A Hayırlı, A Kaya
1. The aim of this experiment was to compare the effects of dietary supplementation of hesperidin, naringin and quercetin on laying hen performance, egg quality and egg yolk lipid and protein profiles. A total of 96 Lohmann White laying hens weighing an average of 1500 g at 28 weeks of age were randomly assigned to a basal diet and the basal diet supplemented (0.5 g/kg) with either hesperidin, naringin or quercetin. Each treatment was replicated in 6 cages in an 8-week experimental period. Data were analysed using one-way ANOVA...
July 6, 2017: British Poultry Science
https://www.readbyqxmd.com/read/28675310/effect-of-crude-protein-concentration-and-dietary-electrolyte-balance-on-litter-quality-foot-pad-dermatitis-growth-performance-and-processing-yields-in-two-medium-heavy-turkey-hybrids
#17
T Veldkamp, P M Hocking, L J Vinco
1. An experiment was conducted to investigate the effect of crude protein (CP) concentration and dietary electrolyte balance (DEB) on growth performance, processing yields, litter quality and foot pad dermatitis (FPD) in male turkeys from two commercial hybrids. Soya bean meal was replaced by vegetable protein sources selected for lower K concentrations to lower DEB in order to improve litter quality and subsequent quality of foot pads. 2. Effects of CP on litter friability and wetness were not consistent during the production period...
July 4, 2017: British Poultry Science
https://www.readbyqxmd.com/read/28656787/quality-assessment-of-chicken-eggshell-cuticle-by-infrared-spectroscopy-and-staining-techniques-a-comparative-study
#18
N Dominguez-Gasca, A Muñoz, A B Rodriguez-Navarro
1. The cuticle is a very thin organic layer that coats the eggshell surface and plugs the eggshell pores preventing bacterial penetration. It also reduces egg shell permeability which is important to maintain egg internal quality. Thus, the eggshell cuticle quality is crucial to ensure the food safety and quality of eggs. 2. A new methodology to assess eggshell cuticle quality, based on attenuated total reflection-Fourier transform infrared spectroscopy (ATR-FTIR), with a more traditional method based on cuticle staining techniques...
June 28, 2017: British Poultry Science
https://www.readbyqxmd.com/read/28511556/performance-and-digestive-function-of-broiler-chickens-given-grit-in-the-diet
#19
B Svihus, K Itani, K Borg, E C Larsson, R Ao, A Sudubilige, B Fuerjiafu, H Liu, H Hetland, G Sanson, B Kierończyk, M Rawski, D Józefiak
1. A series of experiments were carried out to study the effect of grit on broiler performance, gizzard development and fate of grit in the digestive tract. 2. In Experiment 1, performance, gizzard weight and content of grit in the gizzard of broiler chickens given access to granite-type grit was investigated. In Experiment 2, the effect of grit stones on performance and gizzard development was assessed in diets with or without whole wheat. 3. In Experiment 3, the effect of grit in the form of zeolite, granite or marble on gizzard development and digestive tract grinding and passage was studied in diets with or without whole wheat...
June 21, 2017: British Poultry Science
https://www.readbyqxmd.com/read/28503928/effect-of-intermittent-feeding-and-oat-hulls-to-improve-phytase-efficacy-and-digestive-function-in-broiler-chickens
#20
A Sacranie, X Adiya, L T Mydland, B Svihus
1. Two trials were carried out to investigate the impact of intermittent feeding and oat hulls as methods to stimulate the anterior digestive tract in broiler chickens. 2. In Trial 1, 7-d-old broilers were placed 4 per cage in 48 cages and fed either ad libitum or intermittently on a diet with 50 g/kg of either oat hulls or cellulose, with or without 1000 FTU phytase, in a 2 × 2 × 2 factorial arrangement. Ad libitum fed birds had two 4-h dark periods with 1-h light in between, while intermittently fed birds in addition had restricted access to feed through four 1 h feeding bouts...
June 15, 2017: British Poultry Science
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