Changes of Hormone Pattern during the Reproduction Period in White Roman Geese

• Main Authors: Pei- Cheng Chung, 鍾佩真
• Other Authors: Chii-Ming Chiou
• Format: Others
• Language: zh-TW
• Published: 2007
• Online Access: http://ndltd.ncl.edu.tw/handle/23820967918453588868

碩士 === 國立嘉義大學 === 動物科學系研究所 === 95 === Understanding the changes of the hormone pattern during the reproduction period in geese, will aid improve their reproduction performance. The objective of this experiment is to observe and compare the geese’s behavior during laying period and non-laying period, and the changes of hormone in vivo. The experiment was conducted from September 2004 to July 2006, for a period of 1 year and 10 months. When the experiment begun, the geese were divided into two groups (A and B group). Group A was put into the natural photoperiod place, caged individually, and their behaviors were recorded. Group B was put into the artificial photoperiod place with wet pad system and feeding together, feeds and water were supplied ad libitum. The results showed that the average egg weight in natural photoperiod. Among each treatment was no different, only group A (145.63 g) is lighter than other treatments. There was no significant difference in egg length and width ( 8.7㎝ and 5.6㎝) between the two groups (P＞0.05). In the overall laying period, although the changes of hormone in geese were no significant (p>0.05), but there is a slightly different. Furthermore, the changes of estrogen (E2), progesterone (P4) and testosterone (T) concentration in the circulation were significantly different 7 hours before and after laying, but FSH and LH were not. In overall experiment period, after artificial insemination (AI) of geese, their fertilization rate (20%) was observed to be significantly lower than natural mating (50%) (P＜0.05). Conclusion, artificial photoperiod can delay first laying period which lead to heavier eggs. The changes of hormone between nonlaying period and laying period have no significant difference.