Effects of different growth rates at different growth stages on serum biochemical indices of Dagu chicken roosters
The purpose of this experiment was to study the changes of serum biochemical indexes of Dagu chicken roosters and analyze the differences of serum biochemical indexes among chickens with different growth rates.In the experiment,263 roosters aged one day were raised to 24 weeks old.From the third week,five cocks were randomly selected for blood collection every single weekend,and serum biochemical indexes were measured.At the 12th week of age,12 chickens with high body weight(H group)and six chickens with low body weight(L group)were randomly selected,and their body weight was accurately measured and blood samples were taken to measure serum biochemical indexes.The results showed that serum albumin,globulin,total carbon dioxide,calcium,total bilirubin,and urea nitrogen were significantly or extremely significantly positively correlated with age(P＜0.05 or P＜0.01),while albumin to globulinl ratio,total bile acid,glucose,and inorganic phosphorus were significantly negatively correlated with age(P＜0.05).There was no significant difference in serum aspartate aminotransferase levels(P＞0.05),while there were significant differences in other serum indexes among different feeding stages(P＜0.05).At 12 weeks old,the serum total bile acid content in H group was significantly higher than that in L group(P＜0.05),and glucose content was significantly lower than that in L group(P＜0.01).There was a significant(P＜0.05)or extremely significant(P＜0.01)correlation between body weight and serum total bile acid,lipase,and glucose levels.The study indicates that the contents and differences of serum biochemical indexes in different feeding stages of Dagu chicken roosters are determined,and the body weight of 12-week-old Dagu chickens is related to bile acid,glucose and lipase in serum,and the body weight can be estimated by a mathematical model.
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