Effects of photoperiod on feeding, growth traits and metabolism in geese

• Main Authors: Chu, Hunghsin, 朱宏鑫
• Other Authors: Yang, Shyikuen
• Format: Others
• Language: zh-TW
• Published: 2012
• Online Access: http://ndltd.ncl.edu.tw/handle/93259797206333706481

碩士 === 東海大學 === 畜產與生物科技學系 === 100 === Three trials were conducted to investigate the effects of photoperiod on the feed intake, growth, metabolism and plasma levels of metabolites in geese. In trial I, 16 9-wk White Roman goslings were subjected to the regimen of either day reversing (group R; lighting from 18:00 to 08:00) or normal day (group C; lighting from 06:00 to 20:00). Four geese in each group were fed individually for intensive feed intake recording. At the end of 2-wk of experimental period, geese which were fed individually were fasted for 12 hr fallowed by blood sampling at intervals of 4 hr for 24 hr. In each group, four geese fed in group were collected blood also, but allowed to access feed freely. Results showed that the hourly feed intake (HFI) during lighting phase was significantly higher than during dark phase in both groups (P < 0.05). Daily gain (DG), daily feed intake (DFI), feed efficiency (FE) and the levels of plasma glucose (Glu), triglycerides (TG) and uric acid (UA) at each time point were not different between groups (P > 0.05). Glu, TG and UA in fasting geese were significantly lower than in non-fasting geese (P < 0.05). In trial II, 16 11-wk goslings were randomly subjected to either 8L/16D (group SD) or 8L/7D/1L/8D skeleton long days (group SL). Feed intake was recorded intensively. At 15 wk of age, geese were sacrificed for the analysis of carcass traits and proximate composition of breast meat. Results showed that DG, DFI, FE, and UA in group SL were significantly lower than in group SD (P < 0.05). TG and Glu were not different between groups. The visceral fat in group SL was significantly lighter than in group SD (P < 0.05). HFI was not different between lighting phase and dark phase in SD group; however, HFI during lighting phase was significantly higher than during dark phase in group SL (P < 0.05). HFI during dark phase in group SL was significantly lower than in group SD (P < 0.05); however, HFI during lighting phase was not different between groups. In trial III, 6 somatic mature geese were sequentially exposed to normal long days (14L/10D, treatment C) and reversing long days (10D/14L, treatment R) for the determination of carbon dioxide production rate. Results showed that the carbon dioxide production rates both during whole day and during lighting phase in treatment C were significantly higher than in treatment R (P < 0.05), but those during dark phase was not different between treatments. In spite of treatments, both mean and minimal carbon dioxide production rates were not different between day and night; however, in spite of day and night, the minimal carbon dioxide production rate in treatment C was significantly higher than in treatment R (P < 0.05). In conclusion, day reversing lowers the rates of fasting heat production during whole day and day time, but does not affect daily gain, daily feed intake and feed efficiency; the minimal heat production rate is not different between day and night; short day increases daily gain, daily feed intake and feed efficiency; photoperiod affects the feeding behavior.