Comparison of production performance of black-bone chicken in different production stages

  Wuji is the world’s rare, rare birds endemic to China, is a valuable national resource species [1]. There are more silky and white-feathered black-bone chickens in domestic and foreign research and reports. According to the research of foreign experts, the protein content of black-bone chicken is very high, and contains 18 kinds of amino acids, while the meat of ordinary chicken only contains 16 kinds of amino acids, and the content of free amino acids is high [2]. In addition, black-bone chickens are rich in melanin, blood calcium and vitamin E, and have low cholesterol content. The γ-globulin contained in the blood is significantly higher than that of ordinary chickens, which can strengthen the body’s blood cells and heme, regulate physiological functions, and enhance immune function [3 ]. Therefore, the nutritional value of black-bone chicken is higher than that of ordinary broiler or egg chicken. How to develop the black-bone chicken breeding industry healthily has become a concern of many scholars and farmers. This article mainly compares the production performance of black-bone chicken at different stages of production, and provides a certain theoretical basis for chicken farmers and scientific researchers.
  1 Materials and Methods
  1.1 Test Materials
  electronic scales, tanks and drums, feed grinding stirrer, drinking.
  1.2 Experimental design
  The experiment has 4 test groups, E1 group, E2 group, E3 group and E4 group, with 4 replicates in each group. 200 chickens of the same breed of the same breed of 32 weeks old, 36 weeks old, 40 weeks old and 44 weeks old were selected and divided into groups E1, E2, E3 and E4 respectively, with 50 birds for each repeat. The experimental chickens were raised in cages, and the feed was prepared according to the formula of Zhao Xiaoling et al. [4], and the feeding management was carried out according to the feeding standards of laying hens. The test period was 28 days, and the egg production rate, average egg weight, average daily feed intake, and feed-to-egg ratio were determined. The test base is the chicken farm of Wenshui Jinke Biological Ecological Development Co., Ltd. in Luliang City, Shanxi Province.
  1.3 index measuring
  egg laying rate = Number / Number × 100% black chicken
  egg weight = total egg weight (G) / the total number of eggs
  ADFI = Total intake (G) / Total Days
  material egg ratio = daily feed intake / daily egg weight
  1.4 data processing
  test data using statistical analysis software SAS Vol.6.12, according to the results of “mean ± standard deviation” represents, ANOVA statistical method call, Duncan’s multiple comparisons significant difference test.
  2 Results
  2.1 black-laying rate comparing different stages of production
  known from FIG. 1, at different stages of production, egg production rate of the black-volatile, wherein Group E3 black-laying rate maximum, the other test groups of black- There was a statistically significant difference (P<0.05), and the egg production rate of the black-bone chicken E4 group began to decrease significantly.   2.2 black chicken egg weight different stages Comparative   evident from FIG. 2, different stages of production of black chicken have some differences in the average egg weight, wherein the weight average egg E3 highest group, significant differences exist with other groups was statistically significant (P<0.05); The average egg weight of the E1 group was the lowest, and the average egg weight of the E4 group decreased significantly.   2.3 Comparison of average daily feed intake of black-bone chickens in different production stages   It can be seen from Figure 3 that the average feed intake of black-bone chickens at different production stages has no significant difference (P>0.05), and the average feed intake of black-bone chickens at different stages fluctuates slightly. From 32 weeks of age, the feed intake of black-bone chickens began to increase, and the feed intake of the 44-week-old black-bone chickens was the largest.
  2.4 black chicken egg different stages than the comparative material
  is apparent from FIG. 4, a significant difference was statistically significant (P <0.05) in the presence of 4 black chicken egg production phase feed ratio. Among them, the feed-to-egg ratio of the black-bone chickens in group E3 is lower than that of the other three groups. The feed-to-egg ratio is an indicator reflecting the income of farmers. The lower the feed-to-egg ratio, the higher the economic efficiency of breeding. The 43-week-old black-bone chicken better meets the economic benefits of breeding.   3 Discussion   laying rate of 3.1 different stages of   laying rate is a measure of poultry, in particular, is one of the important indicators of production performance of laying birds, the study found that black chicken egg production rate because of which the different stages of production and different changes occur 32 weeks There are certain differences in the four production stages of age, 36 weeks of age, 40 weeks of age, and 44 weeks of age, and the egg production rate of 40 weeks of age is significantly higher than that of other age groups (P<0.05). This shows that black-bone chickens reach the peak egg production period at the age of 40 weeks, and then the egg production rate drops at the age of 44 weeks, indicating that the egg production peak period has passed. This is consistent with the research results of Du Pingping [5]. The egg production rate of the black-bone chickens used in this study decreased after 44 weeks of age because the chicken farm did not pay attention to the uniformity of the black-beared chickens during the rearing period, which delayed the start of laying age, and the body was too fat or thin, which caused a decrease in the number of eggs. Feed was wasted, so it is difficult to reach peak egg production.   3.2 Average egg weight in different production stages   In this study, the average egg weight of black-bone chickens in the four production stages is different, especially the eggs laid at the 40-week-old stage are significantly heavier than other age groups (P<0.05), this is because the chickens The egg weight is related to genetic factors, and the egg weight is affected by a series of factors, such as the age of the hen, the age at the start of production, and the season at the start of production. It is also closely related to the environmental conditions and management conditions in the artificial feeding process. Zhang Zizhong et al. [6] found that the egg weight of chickens is usually lighter in the early stage of laying, and the eggs of laying hens are heavier. As the laying age increases, the egg weight increases, which is consistent with the results of this study.   3.3 The average daily feed intake of different stages   different stages of production of black-on average daily feed intake was not significant (P> 0.05), which may be due to the black-adapted to feed the feed, so that several stages of production The average daily feed intake has little difference and remains at a stable value.
  3.4 Feed-to-egg ratios of different production stages The feed-to-egg ratio of
  40-week-old black-bone chickens is lower than that of other production stages. According to the formula, the average daily feed intake is almost unchanged, and the egg weight increases, so the feed-to-egg ratio decreases. The research results of Zhang Zizhong et al. [6] are similar. This study found that 40-week-old black-bone chickens have better growth performance and higher economic benefits. This has good guiding value for farmers to improve the production performance of black-bone chickens and master the highest production efficiency of black-bone chickens in production.
  At present, there are few comparative studies on the production performance of black-bone chickens at different stages of production. Although this experiment found that farmers can effectively improve the performance of black-bone chickens at 40 weeks of age, the egg production of black-bone chickens is generally lower than that of other poultry. Therefore, the magnitude of improvement is relatively small. Therefore, the results of this study only provide theoretical support and practical guidance for black-bone chicken farmers.
  4 Conclusion
  Wuji have different performance at different stages of production, and the resulting economic benefits are also different. Therefore, farmers should consider the market price and demand of eggs, as well as the different breeds they raise, and choose the best breeding method to obtain greater economic profits. It is not necessary to ignore the benefits of black-bone chicken eggs because of the pursuit of medicinal value function. After 40 weeks of age, as the age increases, the egg production rate of black-bone chickens increases and the feed-to-egg ratio decreases, which shows that the performance of black-bone chickens is very effective at 40 weeks of age.
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