Animal Husbandry and Feed Science ›› 2017, Vol. 38 ›› Issue (9): 13-13.doi: 10.12160/j.issn.1672-5190.2017.09.005

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Effect of Forced-molting on Productive Performance of Small-sized and Blue-shell Egg Population of Luohe Chickens

HUANG Yan-kun1, LIU Jian1, YANG Peng-kun1, MA Shan-cai2,ZHANG Meng1, CAI Dian-ming2,LI Kai- yuan2, FAN Jia-ying1(1.College of Animal Science and Technology, Henan Institute of Animal Husbandry and Economy, Zhengzhou 450046 ,China; 2.Henan Xingnong Animal Husbandr^^ Co. Ltd., Luohe 462412 , China)   

  • Online:2017-09-20 Published:2017-09-20

Abstract: The purpose of this study was to evaluate possible effect of forced-molting by starving on productive performance of small-sized and blue-shell egg population of Luohe Chickens, and to assess the possible influence of dietary supplementation of mineral meal in the initial period of starvation on culling and mortality of the forced-molting chickens population. A total of12 299 small-sized and blue-shell egg breeding Luohe Chickens were selected; one day before the beginning of the formal experiment, 100 of them were marked and used to determine the weight variation during the starvation period; the whole chickens population received no feeding and water on the 1^st and 2^nd day of the experiment; during the 3^rd to 7^th day, water was started to provide but no feeding was supplied, and the basil diet was supplemented with mineral meal on the first four days of the experiment; from the 8^th day of starvation period, the marked chickens were weighted and when the weight loss rate of up to 70% of the marked individuals reached to 25%, the feeding was resumed; the culling and mortality of the chickens population during starvation period and 15 days within feeding resuming period were determined and statistically assessed, and that of the mineral meal supplementation and non-supplementation chickens population were also statistically evaluated; the first laying time at the feeding resuming period was recorded, and the laying rate and broken egg rate during starvation period and 6 weeks within feeding resuming period were calculated. The results showed that the weight of the chickens population decreased by 24.1% after a 20-day-long starving treatment, meeting the requirement of feeding resuming; at the late stage of starvation period, the weight loss rate of the individuals with lower starting-weight was found significantly increased compared to that of the individuals with higher starting-weight(P〈0.05 or P〈0.01); a significantly higher culling and mortality was observed from 5~(th) to 8~(th) day during starvation period(P 0.05) and from 0 to 3^rd day during feeding resuming period(P 0.05 or P〈0.01); the culling and mortality of thechickens population during starvation period and 15 days within feeding resuming period was both lower than 1.1%; the mineral meal supplementation chickens population had significantly lower culling and mortality than the non-supplementation population at the two above-mentioned period(P〈0.01); during starvation period, the reduction of laying rate and broken egg rate in the mineral mealsupplementation population was obviously lower than that in the non-supplementation population; eggs were started to appear on the 10^th day of feeding resuming period, the laying rate exceeded 50% at the 6^th week, and the broken egg rate was declined with the increase of laying rate. The combined data suggest that the forced-molting technique by starving has a good application effect on the small-sized and blue-shell egg population of Luohe Chickens; furthermore, the dietary supplementation of mineral meal in the initial period of starvation reduces the culling and mortality of the chickens population during starvation period and 15 days within feeding resuming period, and improves the laying rate and decreases the broken egg rate during starvation period.

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