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1. Orf in goats in China: prevalence and risk factors | |||
GAO Yang,ZHAO Yanqing,LIU Jianpeng,ZHOU Ming,LIU Heyuan,LIU Fang,YANG Wenyu,CHEN Dekun | |||
Animal Husbandry, Veterinary Medicine 24 May 2016 | |||
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Abstract:Orf is an important viral disease that affects goats and sheep and results in large economic losses. The aim of this study was to investigate the prevalence of orf and to identify the potential risk factors of this disease in the main breeding areas of China. Among 1241 blood samples collected from goats without clinical signs of orf, 433 samples (34.89%) were positive for orf virus infection, which was detected by polymerase chain reaction (PCR) targeting a partial B2L sequence of the viral genome. Moreover, a total of 874 buccal swab samples were collected, of which 64 samples (7.32%) were positive for the orf virus on the basis of PCR detection. According to logistic regression, all of the variables, including age, breed, location and farm management, had significant impacts on the prevalence of orf. Lambs under intensive management in Yunnan province were more susceptible to orf virus infection than animals in other groups. Anglo-Nubian goats were at more risk of orf positivity than other breeds, whereas Saanen dairy goats were at significantly less risk. In summary, as the first epidemiological study of orf in China, our investigation suggested that orf is a neglected disease that requires more attention in the future.????? | |||
TO cite this article:GAO Yang,ZHAO Yanqing,LIU Jianpeng, et al. Orf in goats in China: prevalence and risk factors[OL].[24 May 2016] http://en.paper.edu.cn/en_releasepaper/content/4691826 |
2. Effect of green LED light stimulation during incubation on embryo growth and development of some primary organs in embryos and newly hatched chicks | |||
ZHANG Lin,ZHU Xudong,WANG Xiaofei,LI Jiaolong,ZHOU Guanghong,GAO Feng | |||
Animal Husbandry, Veterinary Medicine 22 September 2015 | |||
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Abstract:Monochromatic green light-emitting diodes (LED) light stimulation influences the growth performance of chicks posthatch. This study was undertaken with the following objectives: (1) to examine whether the green LED light stimulation induces overheating effect by determining weight loss rate of fertile eggs during incubation period; (2) to look for the eye health and organ development at different ages of embryos and newly hatched chicks. Arbor Acres fertile broiler eggs (n=480) were randomly assigned to 3 incubation groups and exposed to continuous white light, green light, or a dark environment (control) from day 1 to day 19 of incubation. The light sourced from LED lamps with the intensity of 30 lx at eggshell level. The results showed that either green or white light stimuli during embryogenesis did not significantly affect the weight loss rate of fertile egg, hatching time, hatchability, chick embryo or body weight, the weight percentage of heart, liver and eyes, as well as obvious systematic abnormalities in eye weight, side-to-side, back-to-front or corneal diameter from 15 d of embryogenesis to 6 d of posthatch (P > 0.05). Compared with the dark condition, green light stimuli during embryogenesis tended to increase feed intake (P = 0.080), improved the BW gain of birds during 0-6 day posthatch (P < 0.05), and increased the percentage of pectoral muscle to the BW on 3- and 6-day-old birds. In addition, embryos or chicks in green light had lower weight percentage of yolk retention on 19 d of embryogenesis and 1 d of posthatch in comparison to those in dark or white group (P < 0.05). These results suggest providing green LED light during incubation has no detrimental effect on eye health and organ development, but does have potential benefits in terms of enhanced the posthatch growth of broilers. This growth-promoting effect of green light stimulation was not caused by overheating. | |||
TO cite this article:ZHANG Lin,ZHU Xudong,WANG Xiaofei, et al. Effect of green LED light stimulation during incubation on embryo growth and development of some primary organs in embryos and newly hatched chicks[J]. |
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