- 期刊
去勢對綠頭鴨在婚羽換羽期血球相、血清睪固酮濃度與換羽之影響
Effect of Castration on Blood Profile, Testosterone Levels and Molting of Mallard during Nuptial Molting Period
摘要
The objective of this experiment was to study the effects of castration on erythrocyte and leukocyte profile, testosterone concentration in blood and changes in molt of mallard during nuptial molting period. Twenty 7 years of age male mallards with similar body weight were randomly allotted into two groups, sham (control) and complete removal (castrated mallard) during eclipse plumage period. Ten birds of each group were fed in one floor pen for each treatment. Feed and water were ad libutum. Birds were bled from wing vein 4, 8, and 12 weeks after birds were castrated for measurements of erythrocyte and leucocyte profiles and serum testosterone concentrations. The color feather was observed at the end of experiment. Results indicated that castration did not affect red blood cell number and packed cell volume in mallard. There were no significant differences in total white blood cell number, monocytes, heterophils, lymphocytes, basophils, eosinophils and H/L (heterophils/lymphocytes) ratio between the two treatments. The castrated bird had lower serum testosterone levels than that of male mallard during nuptial molt period (p＜0.05); however, castration did not handicap nuptial molt proceeding. Comparison of testosterone levels between castrated mallards and male mallards showed that lower testosterone levels slowed the regeneration rate of both head and tail feather. Thus suffice testosterone levels may be needed for molting and decreased levels during nuptial molt delayed regeneration of feathers.
並列摘要
The objective of this experiment was to study the effects of castration on erythrocyte and leukocyte profile, testosterone concentration in blood and changes in molt of mallard during nuptial molting period. Twenty 7 years of age male mallards with similar body weight were randomly allotted into two groups, sham (control) and complete removal (castrated mallard) during eclipse plumage period. Ten birds of each group were fed in one floor pen for each treatment. Feed and water were ad libutum. Birds were bled from wing vein 4, 8, and 12 weeks after birds were castrated for measurements of erythrocyte and leucocyte profiles and serum testosterone concentrations. The color feather was observed at the end of experiment. Results indicated that castration did not affect red blood cell number and packed cell volume in mallard. There were no significant differences in total white blood cell number, monocytes, heterophils, lymphocytes, basophils, eosinophils and H/L (heterophils/lymphocytes) ratio between the two treatments. The castrated bird had lower serum testosterone levels than that of male mallard during nuptial molt period (p＜0.05); however, castration did not handicap nuptial molt proceeding. Comparison of testosterone levels between castrated mallards and male mallards showed that lower testosterone levels slowed the regeneration rate of both head and tail feather. Thus suffice testosterone levels may be needed for molting and decreased levels during nuptial molt delayed regeneration of feathers.