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《China Poultry》 2018-24
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Effects of Dietary Calcium Level on Production Performance, Egg Quality and Serum Biochemical Parameters of Hens during the Postpeak Period

HUANG Chenxuan;YUE Qiaoxian;HAO Erying;XU Yingjue;ZHAO Xiaoyu;DAI Zhanhui;CHEN Hui;Animal Science and Technology College, Hebei Agricultural University;Hebei Dawu Farming and Animal Husbandry Group;  
This experiment was conducted to investigate the effects of different dietary calcium levels on the productionperformance, egg quality and serum biochemical parameters of hens during the postpeakperiod, and then to estimate thecalcium requirement for diets of Dawufen No.1 laying hens. A total of 144 68-week-age Dawufen No.1 laying hens withgood health were randomly divided into 3 groups with 4 replicates of 12 birds each, and fed with basal diets supplementedwith 2.00%, 3.66% and 4.49% Ca, respectively. The pre-feeding lasted for 1 week, the feeding trial lasted for 4 weeks.The results showed as follows:(1) Different dietary calcium levels had no significant effects on average egg weight, feed/egg,egg-shape index, albumen height and haugh unit of Dawufen No.1 layer(P0.05). The lowest concentration of calcium in hens′ blood was recorded for birds fed with 2.00% Ca level(P0.05), but the highest concentration of PTH in hens′blood was recorded for birds fed with 2.00% Ca level(P0.05); Also, the laying rate in 3.66% Ca level group and4.49% Ca level group was significantly higher than that in 2.00% Ca level group(P0.05). In the 4th week, the eggshellstrength in 3.66% Ca level group was significantly higher than that in the other groups(P0.05).(2) According to thesensitive indices, laying rate and eggshell strength, to estimate dietary calcium requirement, and the optimum calciumrequirement of diet were 4.30% and 3.61%. It is concluded that the dietary recommendation calcium level was 3.96%to 4.30% for Dawufen No.1 Layers during the postpeak period.
【Fund】: 现代农业产业技术体系建设专项资金(CARS-40-K20、CARS-40-S04)
【CateGory Index】: S831.5
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