Evaluating the Response of Cobb MV × Cobb 500 Broilers to Varying Amino Acid Density Regimens for a Small Bird Program     

《The Journal of Applied Poultry Research》2019,28(4):943-962

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复合酶高活性酵母对岭南黄肉鸡生产性能的影响   总被引：5，自引：1，他引：4  

洪奇华 《中国家禽》2003,25(20):8-9

300只岭南黄肉鸡随机分为2组(每组设3个重复,每个重复50只),对照组饲喂基础日粮,试验组在基础日粮中用3%活性酵母替代3%豆粕。饲养试验结果表明:0～49日龄,平均末重、平均日增重、成活率试验组分别比对照组提高8.74%(P<0.05)、8.91%(P<0.05)和5.00%(P<0.05),试验组料蛋比比对照组下降11.25%(P<0.05)。代谢试验表明:能量表观利用率和粗蛋白质表观利用率试验组比对照组分别提高4.05%(P<0.05)和6.84%(P<0.05)。  相似文献   

Bird flu (H7N9) outbreak and its implications on the supply chain of poultry meat in China     

《The Journal of Applied Poultry Research》2015,24(2):215-221

During the past two decades, food safety issues in China not only posed serious threats to Chinese consumers but also damaged the image of Chinese products internationally. In China, food safety is not only about scientific discoveries, advanced laboratories, and sanitation equipment; it is more about the role of different players in the food supply chain. The poultry meat supply chain is instrumental in the spread of the avian influenza A virus (H7N9), raising questions about how policymakers respond to such threats and whether industries need to be restructured to manage and control this epidemic so that it does not recur. As a short-term measure, to prevent the spread of this disease, government authorities enforced the closure of live bird markets (LBM) in disease-affected areas of China. However, in the long term, the poultry meat supply chain needs to be restructured. The aim of the current study was to analyze distribution channels for chicken meat in China and then describe arrangements in poultry meat sectors that incorporate small- and medium-scale producers into the supply chain while responding to shifts in LBMs. We also assessed the role of LBMs in spreading H7N9 and how these interventions affect the poultry meat supply chain in the Chinese market.  相似文献   

Preparation of Adjuvant Diluent for Live Vaccine against Classical Swine Fever and Evaluation of its Immune Effects     

LIANG Kong-xian  LV Xiao-jun  DING Dan  XU Qi  ZHOU Jie  LIU Wei 《中国畜牧兽医》2015,42(9):2467-2473

The aim of this study was to develop a novel oil-in-water (O/W) emulsion as adjuvant diluents (AD) for live vaccine against classical swine fever (CSF) that could effectively enhance the immune effect of vaccine.The AD was prepared by high-pressure homogenization technique.Formulations and preparation parameters were optimized with response surface design.Its stability, particle size, polydispersity (PDI) and Zeta potential were characterized.The humoral immune response and cellular immune response of the AD were evaluated with BALB/c mice by intramuscular injection.The particle size of the AD prepared by optimized formulation and parameters was 100.4 nm, PDI was 0.147, and Zeta potential was —28.7 mV.The experiment results showed that the AD had good stability.The AD was inoculated combined with live vaccine against CSF into BALB/c mice by intramuscular injection.The results showed that the live vaccine against CSF specific immune responses could be evoked in mice by co-inoculation with AD and vaccine.The cellular immune response levels in co-inoculated groups were significantly higher than control group (P<0.05), with obvious phenomena of higher levels of IFN-γ, IL-6 and IL-4 in serum.The result revealed that cellular immune capability significantly improved with the AD.The results strongly revealed that cellular immune capability significantly improved by introducing AD for effective immune-adjuvant for live vaccine against CSF.  相似文献   

Economic evaluation of low pathogenic avian influenza in northeastern US live bird markets     

《The Journal of Applied Poultry Research》2019,28(1):78-84

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Comparison of broiler live performance,carcass characteristics,and fatty acid composition of thigh meat when fed diets supplemented with neutralized sunflower soapstock or soybean oil     

《The Journal of Applied Poultry Research》2013,22(1):118-131

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Development of X-ray computed tomography for live standing cattle     

Toshihiro NADE  Kazuhisa FUJITA  Masashi FUJII  Masaya YOSHIDA  Teikichi HARYU  Satsuki MISUMI  Toshiaki OKUMURA 《Animal Science Journal》2005,76(5):513-517

An X‐ray computed tomography (CT) system for live standing cattle was developed for studying the meat yield, carcass composition and so on. The gantry contained three X‐ray tubes and detectors that corresponded to each X‐ray tube. The system was able to operate while the animal remained standing. The scan area had a diameter of 900 mm. The Musculus longissimus and Musculus trapezius areas, and the back fat thickness in the CT image were evaluated and compared to the actual cross‐section of the carcass using eight cattle. The differences among the muscles, and the subcutaneous and intermuscular fat were easily recognized. The correlation coefficient between the CT image and the actual carcass photograph of the M. longissimus area and the back fat thickness was high (r = 0.84, r = 0.93, P < 0.01). The present study demonstrated that muscle, fat and bone can be clearly imaged from a live standing animal using X‐ray equipment.  相似文献   

Performance of Broiler Chickens Fed Sweet Potato Meal (Ipomoea batatas L.) Diets     

Agwunobi LN 《Tropical animal health and production》1999,31(6):383-389

Day-old Lohman broiler chicks (n = 120) were fed on five starting diets for 4 weeks in groups of 24 birds. The starting diets contained 0%, 9%, 18%, 27% and 36% sweet potato tuber as a replacement for maize. From the fifth week, the 120 birds were tested in groups of 30 on four finishing diets containing 0%, 15%, 30% and 45% sweet potato tuber as a replacement for maize. The carcass quality was significantly (p>0.05) improved due to a significant (p>0.05) reduction of abdominal fat in the birds fed on the 45% sweet potato finisher diets. However, the birds on the sweet potato diet continually passed wet dropppings, resulting in a significant (p>0.05) reduction in body weight and feed conversion efficiency. The optimum levels of inclusion of sweet potato in the diets were considered to be 27% and 30% for starting and finishing broiler chickens, respectively. Sweet potato diets may be a remedy for fatty broilers.  相似文献   

Studies on the mechanism of vaccinal immunity to Marek''s disease   总被引：1，自引：0，他引：1  

L.N Payne  P.C Powell  M.C Rennie  L.J.N Ross 《Comparative immunology, microbiology and infectious diseases》1978,1(1-2):31-36

Current knowledge of the nature of the antigens and of the host immune responses in vaccinal immunity to Marek's disease is reviewed. It is suggested that a two-step mechanism of resistance operates. The first step involves humoral and cell-mediated responses directed against viral antigens; the second step occurs after challenge with Marek's disease virus and consists of cellmediated responses directed against tumour cells.  相似文献   

Growth and Apparent Absorption of Minerals in Broiler Chicks Fed Diets with Low or High Tannin Contents   总被引：5，自引：1，他引：4  

Hassan IA  Elzubeir EA  El Tinay AH 《Tropical animal health and production》2003,35(2):189-196

Sorghum grains with low (0.28 per cent catechin equivalent (%CE) or high (1.36 %CE)) tannin contents were used to study the effect of tannin on growth and on the apparent absorption of Ca, P, Mg, Na, K, Fe and Co by chickens. High-tannin sorghum caused a highly significant (p0.01) reduction in the weight gain and feed intake of broiler chicks compared to low-tannin sorghum and increased the feed conversion ratio (p0.01). The amount of tannin did not affect mortality. The apparent absorption of Ca, P, Mg, Na, K, Fe and Co was reduced (p0.01) by feeding sorghum grains with a high tannin content.  相似文献