| Summary: | 碩士 === 國立中興大學 === 畜產學系 === 90 === Effect of feeding Pangola grass and fasting in early age on growth performance and carcass quality in White Roman geese
Abstract
The purpose of this study was conducted to investigate the effect of feeding pangola grass and different fasting time after post-hatch on the growth performance, development of digestive organs and carcass quality in White Roman geese. In trial 1, one hundred and eighty of day old geese were divided into three treatments and two replicates for each treatment. Three treatments included：(1)goslings were fed with a concentrate diet as control；(2)goslings were fed with a concentrate diet mixed with chopping pangola hay(4.5mm)；(3)goslings were fed with a concentrate diet mixed with chopping pangola grass(＜4cm). Feed and water were supplied ad libitum during 15wks experimental period. The results indicated that 0-4 weeks old goslings had least feed intake(P＜0.05) and daily body weight gain, and had significantly(P＜0.05)least body weight on 4 weeks old when birds feed with pangola hay treatment diet compared with other treatments. However, 9~13 weeks old goslings had a best daily body weight gain in birds fed with pangola hay treatment diet among three treatments. Goslings received pangola grass treatment diet had a highest body weight on 15 weeks old among three treatments thought no significantly different were discovered. The developments of digestive tracts were more fast in goslings fed with pangola hay and pangola grass groups during early stage of life. No cannibalism phenomenon were found in goslings received pangola hay and pangola grass treatment diets but there was a serious peck feather phenomenon in goslings received control diet. The contents of polyunsaturated fatty acid(PUFA) in breast muscle, thigh muscle and abdominal fat were higher when birds fed with pangola grass and pangola hay treatment diets than fed with control diet. However the content of n-3 polyunsaturated fatty acid of thigh muscle in pangola grass group was higher then the other two groups. In comparison with control and pangola hay treatment diets, birds received forage treatment diet had higher “L” and “b” value but had lower “a” value. There were more volatile flavor compounds in muscle of birds fed with pangola grass treatment diet than the other two treatments. In trial 2 the effect of access feed at different time after post-hatch on geese early growth and developments of digestive organs n geese was determined. Our data shows that the highest feed intake is obtained in treatment which geese was fed during 0 hour after post-hatch at 0-3 weeks old. The lowest data is obtained in treatment of access to feed at 72 h after post-hatch. On the daily gain, the lowest one is received feed at 72 h after post-hatch before 14 days old, and all treatments’ data is not significantly different at 14 to 21 days old. The treatment of fasting 0, 24 h after post-hatch makes geese significantly weight heavier than 72 h ones at daily gain and average body weight at 3 weeks old. As the post-hatch fasting time goes, the weight of digestive organs is lowering, and could not recover until 14 days old, and longer fasting time makes more weight reducing of digestive organs. On the other hands, shorter fasting time makes longer intestine until 14 days. Besides colon-rectum, other intestine length is not significantly different of all fasting treatments at 14 days old. Our results suggest that before 48 h post hatch is a very important stage of geese intestine growth, Suffering from fasting will result in worse growth, and also affect growth and absorbing ability of digestive organs and intestine.
Keywords: geese, Pangola grass, growth performance, carcass quality, fasting time, development of digestive organs
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