Growth And Egg Laying Performance Of Different Brown Shell Layers

This experiment studied the different varieties of brown shell layers in the same breeding management under the condition of the breeding effect, in order to compare the appropriate breeding brown shell varieties of laying hens.The experiment was divided into three parts, first part: comparison of the brooding period. During the brooding period selection of hy line brown, Beijing Red, Isa, Roman, Hessian five varieties were different, breeding management under the condition of keeping the same. The results showed that different varieties of eggs hatched, through variance analysis, there was no significant difference. Different varieties of chick weight at birth were significantly different, and isa birth weight and other varieties differ significantly(P < 0.01), between the Roman and the Beijing Red birth weight had extremely significant difference(P < 0.01). In addition to hy line brown and Roman birth weight were not significant(P > 0.05), all the other species of birth weight were significant difference(P < 0.05). Brood phase differences between different varieties of laying hens weight, 2 weeks when Roman brown weight fastest 7.6% higher than her weight in brown, extremely significant difference(P < 0.01), at the same time, higher than Beijing red weight 5.3%, significant difference(P < 0.05), The sea blue, brown and the rest of the two varieties sykes brown weight difference was not significant(P > 0.05), at 8 weeks of age, growth is still growth Roman fastest, at this time Roman than Isa weight 6.4%, extremely significant difference(P < 0.01), more than 4.6% different weight, significant difference(P < 0.05); hy line brown than Isa weight 4.3%, there are significant differences(P < 0.05). Brood of hy line brown, Roman is higher than other varieties, followed by Beijing Red, Hessian, Isa.The second part: rearing. The incubation period of different varieties layers from the brood care is transferred to the three step in laying hen houses, laying hens of 5 different varieties under the same feeding and management conditions after feeding. The results showed that: there was a significant difference in different breed layers in different week old body weight growth. At the age of 8 weeks, the differences among the varieties and the other Isa(P < 0.05). There is no difference between the 11 Weeks of age Beijing Red and Hessian breeds(P > 0.05) there are differences with other varieties. At the age of 19 weeks the Hessian differences Beijing Red and hy line brown, was not significant(P > 0.05), not significant difference between the hy line brown and Isa(P > 0.05), Roman and other varieties of the varieties of weight were significant differences(P < 0.05). The comparison of different varieties layers growth model, the hy line brown layers, Gompertz curve and the fitting degree of the model is the highest, the best fitting effect. For the growth curve estimation, and different breed layers inflection point weight, age and the maximum weight cycle is not the same, the maximum weight of the inflection point, Roman 923.845 g, Roman and the red point to a maximum of 11.119 old week, Isa the maximum weight gain for the period of 3.334. The incubation period of hy line Brown growth higher than other varieties, followed by Roman, Beijing Red, Isa, hessian.The third part: during the laying period. Egg production period of five varieties of different layers in the same breeding breeding management conditions. The results showed that 25 weeks sea sykes brown weight and other varieties exist significant differences(P < 0.01). Different varieties of eggs the transverse diameter and egg-shaped index and egg weight were very significant positive correlation(P < 0.01), Beijing red egg-shaped index and egg weight were very significant positive correlation(P < 0.01), and the rest was not significantly correlated. At 31 weeks of age is still the Hessian and other varieties do not exist significant differences, hy line brown and Beijing Red and Isa and Roman were significant differences(P < 0.05). Egg shape index between Beijing Red hy line brown, Isa, Roman was not significant, but with the Hessian had significant difference(P < 0.05), hy line brown, Roman and Isa, Hessian extremely significant difference(P < 0.01). Roman eggshell strength with other varieties had extremely significant difference(P < 0.01). The Haugh unit of Hessian and other varieties exist significant difference(P < 0.01). In the egg production peak time, highland brown is higher than the other 4 varieties, followed by Roman, Isa, Beijing Red, hessian. 25 week old and 43 week old hy line brown than Roman, Isa, Beijing Red, Hessian laying rate were 0.5%, 0.7%, 0.75%, 0.9%; egg production of Hy line brown layer is high, the ratio of feed to egg hy line brown 2.08:1, Isa 2.18:1, the Roman 2.2:1, the Hessian 2.3:1, Beijing Red 2.4:1.This study suggests that Hyline layers can be regarded as the ideal breed layers, this can be used for reference in the shijiazhuang area vast brown shell egg producers, also can provide the basis for the development of poultry industry.