| Summary: | 碩士 === 國立嘉義大學 === 動物科學系研究所 === 105 === The purpose of this study was to evaluate the effect of feeding frequency on egg production, egg quality, and blood components of laying hens. Three breeds of laying hens, Hisex Brown and Shaver White from commercial strains and selected L2 strain of Taiwan Country Chicken hens.All birds were fed under two feeding regiments, twice-a-day (at 0900 and 1600) and thrice-a-day (at 0900, 1200, and 1600) provided the same total amount of feed per day, were arranged from 18 to 63 wk. Records of daily egg production, egg weights and feed consumptions every two weeks, body weights and egg quality were measured every four weeks, respectively. At 35 and 63 wks of age, sampling six hens per breed per feeding regimens were sacrificed to decet the weight of carcass and organs, follicles morphology, and blood components. The results showed that the increase of the feeding frequency on same amount of feed could increase body weight (P < 0.005) and egg production of laying hens at 35 to 63 wk of age (P < 0.05), but had no effect on feed consumptions and egg weights. Hens fed thrice a day could have heavier egg shell and yolk weight (P < 0.05), and stronger shell strength (P < 0.005), but had no effect on other egg qualities. At 35 and 63 wk of age, no significant difference were found on the weight of carcass and organs , dot blood and score on liver, and follicles morphology. Except that hens fed thrice-a-day had lower levels of plasma glucose concentration (P < 0.005), there were no significant differences among feeding frequency in plasma triacylglycerol, cholesterol, high and low density lipoprotein concentration. Results of the present study indicated that the increase of daily feeding frequency could maintain more stable body weight, better egg production, heavier egg shell and yolk weight, stronger shell strength, and could reduce plasma glucose concentration, regardless of layer breeds.
|
|---|
