不同类型鸡种摄食及其调控机理研究
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摘要
本文通过研究自由采食、限饲和短期饥饿条件下AA肉鸡及白来航蛋鸡摄食及其相关的生长发育与代谢指标,血液生化与激素指标等的变化规律,初步探讨了不同类型鸡种摄食及其调控机理的特点。
试验一自由采食条件下不同类型鸡种摄食及其调控机理研究
本试验采用单因子完全随机设计,比较了3～7周自由采食条件下AA肉鸡及白来航蛋鸡摄食及其相关的生长发育与代谢指标,血液生化与激素指标等方面的差异。结果表明:不同类型鸡种间迥异的生长速度与采食量及饲料转化率有关;肉鸡干物质、粗脂肪、能量表观代谢率,消化酶活性显著低于航蛋鸡;家禽血浆瘦素及血浆神经肽Y水平随周龄增加呈下降趋势,4周龄肉鸡血浆瘦素水平低于同日龄蛋鸡水平(P<0.05)。
试验二限饲条件下不同类型鸡种摄食及其调控机理研究
本文对5～7周龄肉鸡、蛋鸡分别进行50%、80%限饲,探讨限饲对肉鸡、蛋鸡的生长性能、胴体品质、血浆生理生化指标、血浆激素水平及消化酶活性的影响,旨在研究限饲条件下不同类型鸡种摄食及其调控机理。结果表明:限饲条件下,不同类型鸡种体重、瘦肉率、血浆瘦素水平显著降低,但对家禽消化酶活性无显著影响;限饲引起肉鸡血浆甘油三脂、白蛋白、肌酸激酶及天冬氨酸氨基转移酶水平显著降低,但对蛋鸡无显著影响,限饲引起蛋鸡血浆尿酸水平降低,但对肉鸡无显著影响。
试验三短期饥饿条件下不同类型鸡种摄食及其调控机理研究
本试验通过比较肉鸡、蛋鸡短期饥饿后血浆生化指标及血浆激素水平变化规律,旨在研究短期饥饿条件下不同类型鸡种摄食及其调控机理。结果表明:短期饥饿导致肉鸡血浆尿酸水平降低(P<0.05);短期饥饿引起不同类型鸡种间血浆瘦素水平的变化,差异在于升高了肉鸡的血浆瘦素水平,但降低了蛋鸡的血浆瘦素水平。
综上,不同类型鸡种在不同摄食条件下的生长发育与代谢指标、血液生化指标等有较大的差异,其摄食和调控机理有一定区别。
In the experiment, comparison about food-intake, growth, carcass characteristics, dietary apparent metabolic rate, plasma biochemistry indexes, plasma hormone levels, and digestive enzymes activities were made between AA broilers and Leghorn chicks during 3~7week, under ad libitum, food control and fasting 12h, with the arm to study on food-intake discrepancy and its regulation mechanism of different type of chickens.
Experiment 1 Food-intake discrepancy and its control mechanism of different type of chickens under ad libitum
This experiment was adopt single factor completely random design, comparison about food-intake, growth and metabolism were made between AA broilers and Leghorn chicks from during 3~7 weeks under ad libitum. the results showed, different growth rates of AA broilers and Leghorn chicks were due to different food consumption and feed efficiency, Broiler chicks shown lower metabolisability of dietary DM, EE, energy, and lower digestive enzymes activities than Leghorn chicks, plasma leptin lever and NPY level in both type of chickens deceased with age increasing, and plasma leptin level of broilers were lower than Leghorn chicks in 4 week-of-age.
Experiment 2 Food-intake discrepancy and its control mechanism of different type of chickens under food restriction
In this experiment, AA broilers and Leghorn chicks received food restriction with amount of 50% and 80% of ad libitum, respectively. The effect of food restriction on growth, carcass characteristics, plasma biochemistry indexes, plasma hormone levels, and digestive enzymes activities were investigated, with the aim inquiring the food-intake discrepancy and its regulaiton mechanism of different type of chickens under food controlling. The results were as following: food restriction induced lower body weight, lower lean meat percentage and lower plasma leptin level, deceased plasma TG, ALB, CK and AST levels in broilers, deceased plasma UA level of Leghorn chicks ,and food restriction have no significant effect on digestive enzymes activities.
Experiment 3 The control mechanism of food intake different type of chickens under fasting 12h
In this experiment, the effects of fasting 12 h on plasma biochemistry indexs and plasma hormones levelson AA broilers and Leghorn chicks in 48 d was investigated, with the aim inquiring the regulaiton mechanism of food intake different type of chickens under fasting 12h. The result showed that: fasting 12 h induced lower plasma UA level, and fasting 12 h induced lower plasma leptin level in Leghorn chicks but higher plasma leptin level in AA broilers.
In conclusion, broilers and egg chicks had many discrepancies in food-intake, growth, carcass characteristics, dietary apparent metabolic rate, plasma biochemistry indexes, plasma hormone levels, and digestive enzymes activities under ad libitum, food control and fasting 12h, so, different type of chickens showed different food-intake and different regulation mechanism.
试验一自由采食条件下不同类型鸡种摄食及其调控机理研究
本试验采用单因子完全随机设计,比较了3～7周自由采食条件下AA肉鸡及白来航蛋鸡摄食及其相关的生长发育与代谢指标,血液生化与激素指标等方面的差异。结果表明:不同类型鸡种间迥异的生长速度与采食量及饲料转化率有关;肉鸡干物质、粗脂肪、能量表观代谢率,消化酶活性显著低于航蛋鸡;家禽血浆瘦素及血浆神经肽Y水平随周龄增加呈下降趋势,4周龄肉鸡血浆瘦素水平低于同日龄蛋鸡水平(P<0.05)。
试验二限饲条件下不同类型鸡种摄食及其调控机理研究
本文对5～7周龄肉鸡、蛋鸡分别进行50%、80%限饲,探讨限饲对肉鸡、蛋鸡的生长性能、胴体品质、血浆生理生化指标、血浆激素水平及消化酶活性的影响,旨在研究限饲条件下不同类型鸡种摄食及其调控机理。结果表明:限饲条件下,不同类型鸡种体重、瘦肉率、血浆瘦素水平显著降低,但对家禽消化酶活性无显著影响;限饲引起肉鸡血浆甘油三脂、白蛋白、肌酸激酶及天冬氨酸氨基转移酶水平显著降低,但对蛋鸡无显著影响,限饲引起蛋鸡血浆尿酸水平降低,但对肉鸡无显著影响。
试验三短期饥饿条件下不同类型鸡种摄食及其调控机理研究
本试验通过比较肉鸡、蛋鸡短期饥饿后血浆生化指标及血浆激素水平变化规律,旨在研究短期饥饿条件下不同类型鸡种摄食及其调控机理。结果表明:短期饥饿导致肉鸡血浆尿酸水平降低(P<0.05);短期饥饿引起不同类型鸡种间血浆瘦素水平的变化,差异在于升高了肉鸡的血浆瘦素水平,但降低了蛋鸡的血浆瘦素水平。
综上,不同类型鸡种在不同摄食条件下的生长发育与代谢指标、血液生化指标等有较大的差异,其摄食和调控机理有一定区别。
In the experiment, comparison about food-intake, growth, carcass characteristics, dietary apparent metabolic rate, plasma biochemistry indexes, plasma hormone levels, and digestive enzymes activities were made between AA broilers and Leghorn chicks during 3~7week, under ad libitum, food control and fasting 12h, with the arm to study on food-intake discrepancy and its regulation mechanism of different type of chickens.
Experiment 1 Food-intake discrepancy and its control mechanism of different type of chickens under ad libitum
This experiment was adopt single factor completely random design, comparison about food-intake, growth and metabolism were made between AA broilers and Leghorn chicks from during 3~7 weeks under ad libitum. the results showed, different growth rates of AA broilers and Leghorn chicks were due to different food consumption and feed efficiency, Broiler chicks shown lower metabolisability of dietary DM, EE, energy, and lower digestive enzymes activities than Leghorn chicks, plasma leptin lever and NPY level in both type of chickens deceased with age increasing, and plasma leptin level of broilers were lower than Leghorn chicks in 4 week-of-age.
Experiment 2 Food-intake discrepancy and its control mechanism of different type of chickens under food restriction
In this experiment, AA broilers and Leghorn chicks received food restriction with amount of 50% and 80% of ad libitum, respectively. The effect of food restriction on growth, carcass characteristics, plasma biochemistry indexes, plasma hormone levels, and digestive enzymes activities were investigated, with the aim inquiring the food-intake discrepancy and its regulaiton mechanism of different type of chickens under food controlling. The results were as following: food restriction induced lower body weight, lower lean meat percentage and lower plasma leptin level, deceased plasma TG, ALB, CK and AST levels in broilers, deceased plasma UA level of Leghorn chicks ,and food restriction have no significant effect on digestive enzymes activities.
Experiment 3 The control mechanism of food intake different type of chickens under fasting 12h
In this experiment, the effects of fasting 12 h on plasma biochemistry indexs and plasma hormones levelson AA broilers and Leghorn chicks in 48 d was investigated, with the aim inquiring the regulaiton mechanism of food intake different type of chickens under fasting 12h. The result showed that: fasting 12 h induced lower plasma UA level, and fasting 12 h induced lower plasma leptin level in Leghorn chicks but higher plasma leptin level in AA broilers.
In conclusion, broilers and egg chicks had many discrepancies in food-intake, growth, carcass characteristics, dietary apparent metabolic rate, plasma biochemistry indexes, plasma hormone levels, and digestive enzymes activities under ad libitum, food control and fasting 12h, so, different type of chickens showed different food-intake and different regulation mechanism.
引文
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