不同羽色儋州鸡生长曲线拟合与分析研究

为研究儋州鸡生长发育规律和各阶段的生长速度,本试验采用Gompertz、Logistic和Bertalanffy 3种非线性模型对黑色羽系和麻花色羽系儋州鸡0~18周龄体重生长数据进行拟合和分析,选取黑色羽系、麻花色羽系儋州鸡各200只（公、母各半）,分别于0、2、4、6、8、10、12、14、16和18周龄晨饲前空腹称重并记录,并利用3种非线性模型对儋州鸡生长曲线进行拟合比较分析。结果显示,2种羽色儋州鸡实测生长曲线基本一致,接近于"S"型,符合正常生长发育规律,2种不同羽色儋州鸡母鸡0~18周龄的体重实测值差异不显著（P>0.05）,公鸡0~16周龄的体重实测值差异不显著（P>0.05）,而16~18周龄麻花色羽系公鸡体重显著高于黑色羽系公鸡（P<0.05）。3种非曲线模型拟合度（R²）均在0.992以上,均能较好地拟合2个羽系儋州鸡的生长曲线,且模型的预测曲线与实际观测曲线基本吻合,但Gompertz模型曲线吻合度高于Logistic和Bertalanffy模型曲线,且母鸡比公鸡拟合效果好。本研究结果初步揭示了儋州鸡的生长发育规律和各阶段的生长特征,可为儋州鸡选育、生产和产业化发展提供科学依据。     

溧阳鸡生长曲线分析与拟合的研究

运用Logistic模型和Gompertz模型对溧阳鸡0~12周龄生长曲线进行了分析和非线性的拟合研究。结果表明,溧阳鸡公、母鸡在3周龄前生长曲线基本一致,之后公鸡则明显高于母鸡,且保持较长时间的快速生长状态。Logistic模型和Gompertz模型均能比较好地拟合溧阳鸡公鸡的生长曲线(R2分别为0.994 4和0.995 3)和母鸡的生长曲线(R2分别为0.996 7和0.997 9),但Gompertz模型在拟合度和预测体重效果方面相对较好。拟合曲线模型中代表极限体重的参数A,公鸡明显高于母鸡,其他参数接近或略有差异。     

信宜怀乡鸡不同品系生长曲线拟合分析

信宜怀乡鸡作为列入国家畜禽遗传资源保护名录的著名品种,为了解其肉种鸡的早期生长发育规律,为其遗传资源保护和品系选育提供参考依据。使用Logistic、Gompertz和Bertallanffy3种非线性生长模型对怀乡鸡A、B两个品系母鸡0~9周龄早期体重生长数据进行曲线拟合和分析。3种模型均能很好地模拟怀乡鸡生长曲线。Bertalanffy模型的拟合A品系母鸡生长效果最佳（R^2=0．996）,其拐点为（10．165,1047．7）;Gompertz模型的拟合B品系母鸡生长效果最佳（R^2=0．997）,其拐点为（8．008,748．3）。3种模型对信宜怀乡鸡生长曲线的拟合和分析是可行的．可及时掌握怀乡鸡的生长发育规律。     

浙东白鹅生长曲线及拟合分析

运用Logistic、Gompertz和Von Bertalanffy 3种非线性模型对浙东白鹅0~8周龄的生长曲线进行分析及拟合比较。结果表明,浙东白鹅公、母鹅在3周龄前生长曲线基本一致,之后一直到8周龄公鹅明显高于母鹅;3种曲线模型拟合度均达到0.99以上,其中Gompertz曲线模型在拟合度和预测极限生长量拐点周龄和最大周增重等方面相对较好。进一步分析结果表明,浙东白鹅公鹅的拐点体重高于母鹅,拐点周龄性别间差异不大。本研究对不同性别浙东白鹅的生长模式及其对营养环境的需求进行了初步探讨,为开展浙东白鹅的规模化养殖提供参考。     

西藏藏鸡生长曲线拟合及分析

为探究西藏藏鸡早期的生长发育规律,本研究采用Logistic、Bertalanffy和Gompertz非线性模型对公、母鸡从出生到24周龄的体重进行拟合分析。结果显示:3种生长曲线模型的拟合度均能达到0.99以上;进一步从统计和生物学意义角度评价3种模型发现,Gompertz模型拟合效果最好;Gompertz方程拟合公鸡和母鸡的生长拐点周龄分别为10.28周和10.65周;公鸡的拐点体重、最大周增重和最大体重分别为577.20、80.81、1569 g,母鸡分别为465.80、55.90、1266.18 g。研究表明3种模型对西藏藏鸡生长曲线的拟合和分析是可行的,可为管理藏鸡生长发育关键点提供参考。     

Comparative Study on Analysis and Fitting of Pudong Chicken Growth Curve

The objective of this paper was to study the growth and development laws of Pudong chicken. The growth curve of Pudong chicken(cock and hen) from 0 to 20 weeks was analyzed and fitted with three models(Gompertz, Logistic and Bertalanffy). It was concluded that the growth curves were appropriately fitted with three models, and fitness degree(R2)in growth data of Pudong chicken were all above 0.992. The Bertalanffy model was the most effective with the highest R2 for cock(R2=0.995) and hen(R2=0.999), respectively. With further analysis of fitted parameters for Logistic model of cock, 0-3 weeks' fitted values were significantly greater than measured values and 4-8 weeks ' fitted values were lower than measured values. Compared with Logistic model, the values calculated by Gompertz model and Bertalanffy model were more coincident with the practical measuring values. For hens, 0-3 weeks ' fitted values of Logistic model were significantly greater than measured values and 0-2 weeks ' fitted values of Gompertz model were slightly greater than measured values, while the values calculated by Bertalanffy model best matched the observed val-ues from actual measure. The results showed that Bertalanffy model used to estimate the growth weight of Pudong chicken was the best while Logis-tic model was the worst. So the fitness and analysis of growth curves of Pudong chicken are valid, which may be adopted to predict growth and de-velopment laws of Pudong chicken and provide reliable data for precise feeding and breeding.     

不同能量水平对朗德鹅生长曲线的影响研究

在不同能量水平下,运用Logistic模型和Gompertz模型对朗德鹅0～10周龄生长曲线进行了分析和非线性曲线拟合研究。结果表明,不同生长阶段,朗德鹅公鹅、母鹅的适宜能量水平不同,Logistic模型和Gompertz模型都能很好地拟合朗德鹅的生长曲线,但Gompertz模型在拟合度和预测体重效果方面相对较好。中等能量水平下,2周龄前公鹅、母鹅的生长曲线基本一致,之后公鹅则明显高于母鹅,且保持较长时间的快速生长状态,公鹅的拐点体重显著高于母鹅,但拐点日龄的出现却晚于母鹅。     

罗曼肉鸡生长发育规律研究

对1～9周龄的罗曼肉鸡体重进行了测量,计算了绝对生长、相对生长指标,运用Logistic、Gom-pertz和von Bertalanffy三种非线性模型对其累积生长情况进行了拟合与分析。结果表明：罗曼肉鸡在4周龄前生长缓慢,4周龄后逐渐加快;Gompertz模型和von Bertalanffy模型均能很好地拟合罗曼肉鸡的生长曲线（R2分别为0.9989和0.9998）,尤其是von Bertalanffy模型效果更佳,此模型拟合的生长曲线拐点日龄为39.23d,拐点体重为1512.09g。     

A Growth Performance and Nonlinear Growth Curve Functions of Large- and Normal-Sized Japanese Quail (Coturnix japonica)

This study aimed to evaluate the differences between the growth patterns of large- and normal-sized Japanese quail strains and their F₁ progeny, by fitting their growth parameter values to five nonlinear regression growth models (Weibull, Logistic, Gompertz, Richards, and Brody). The Richards model presented the best fit for both sexes of the large-sized quail strain, whereas the Gompertz model presented the best fit for both sexes of the normal-sized quail strain, based on goodness-of-fit criteria (higher adjusted R² and lower Akaike and Bayesian information criteria). Both sexes of F₁ birds derived from the cross between normal-sized females and large-sized males were best fitted by the Richards model. In contrast, growth parameters of the F₁ birds derived from the cross between large-sized females and normal-sized males were best fitted to the Gompertz model. The data could be fitted nearly as well to the Weibull and Logistic models as to the Richards and Gompertz models. The Brody model presented the poorest fit for the growth parameter values. The results indicated that the Richards and Gompertz models could best describe the growth characteristics of both large- and normal-sized quails. Moreover, the observed growth pattern of the F₁ birds was likely inherited from the male parental strain. To the best of our knowledge, this is the first study comparing the growth curves of the reciprocal F₁ generations with their parental strains in quails.     

文昌鸡生长模型拟合的研究

试验旨在通过生长曲线的拟合来了解文昌鸡生长发育的规律。用Logistic、Gompertz和Bertallanffy 3种非线性生长模型对公母文昌鸡的生长发育进行拟合。3种模型均能较好地拟合文昌鸡生长曲线,但是Gompertz模型在公母鸡上拟合效果均最佳。公母鸡在4周前生长较一致,4周后,公鸡生长速度明显快于母鸡。运用3种模型对文昌鸡进行生长曲线的拟合和分析是可行的,对及时了解文昌鸡的生长发育规律提供了参考。     

边鸡生长曲线拟合和比较分析的研究

运用Logistic, Gompertz, Bertallanffy 3种非线性模型分别对边鸡进行曲线拟合和分析。研究结果表明,3种模型均能较好的模拟边鸡生长曲线,拟合度（R2）均高于0.99,其中以Bertallanffy模型的拟合度最高（公、母鸡分别为0.9974和0.9984）。因此,运用3种模型对边鸡进行生长曲线的拟合和比较分析是可行的,为及时了解边鸡的生长发育规律提供了参考。     

贵州黄鸡慢羽系生长曲线拟合研究

试验旨在揭示贵州黄鸡慢羽系生长发育规律。选择100只贵州黄鸡慢羽系（公母鸡各50只），于0、2、4、6、8、10、12、14周龄末称重，分别采用Bertalanffy、Logistic、Gompertz 3种非线性生长曲线模型对贵州黄鸡慢羽系0~14周龄体重变化进行拟合分析。结果表明：3种模型均能很好地拟合其生长曲线，拟合度均在0.99以上，其中Logistic模型在贵州黄鸡慢羽系公鸡、母鸡生长曲线中拟合最好，拟合结果最接近实测体重情况，其公鸡拐点体重为1 550.81 g，拐点周龄为10.42，母鸡拐点体重为976.67 g，拐点周龄为9.14。试验结果初步揭示了贵州黄鸡慢羽系的生长发育规律和各阶段的生长特征，为贵州黄鸡慢羽系选育生产和产业化发展提供了科学依据。     

隐性白羽鸡与清远麻鸡生长曲线及相关性研究

为充分挖掘品种资源生长潜力,以清远麻鸡和国外引进的快大型品种隐性白羽鸡为研究对象,用Logistic模型、Gompertz模型和Von Bertalanffy模型对体重和胫长进行了生长曲线的拟合,并比较了3种模型拟合效果的优劣。结果表明,体重用Gompertz和Von Bertalanffy模型拟合效果较好,胫长用Logistci模型拟合效果较好。2周龄体重、3周龄胫长与3～14周龄体重极显著,r值为0.8。通过对早期体重和胫长的个体选择,可达到上市日龄较大体重的要求。     

Growth rate of different sexes of the European quail (Coturnix coturnix)

1. The Gompertz equation was used to described the growth of the European quail (Coturnix coturnix) from hatching until 107 d of age.

2. Differences (P < 0.05) in growth existed between sexes. Mature mass values of 148.0 ±3.00 and 191.9 ±5.35 g respectively were found for males and females. Males reached maximum growth at 13.4 ± 0.33 d while a value of 16.4 ± 0.46 d was found for females.

3. A plateau in daily food intake was reached when the time of mature mass was approached.     

麻旺鸭生长曲线拟合分析

本文对麻旺公母鸭体重随日龄增长应用Logistic和Gompertz模型进行生长曲线拟合分析,建立麻旺鸭公、母鸭的拟合曲线方程及求出拐点体重、拐点日龄。结果表明:两种模型均能很好地拟合公、母鸭生长规律,Logistic和Gompertz模型拟合公鸭的拟合度分别为R2=0.983,R2=0.986,母鸭R2=0.989,R2=0.990,两种模型相比,Gompertz拟合效果更好。     

桂香鸡母鸡生长规律及生长曲线拟合分析

为了解桂香鸡母鸡的生长发育规律,采用Logistic、Gompertz和Bertalanffy3种非线性模型,分别对桂香鸡母鸡1～16周龄体重增长情况进行了拟合与分析。试验结果表明,3种模型的拟合度均达到了0．981以上,其中,Bertalanffy模型拟合效果最好,拟合度为0．993,该模型预测的桂香鸡母鸡拐点周龄为4．55周,拐点体重为333．10g。该研究揭示了桂香鸡的生长发育规律,同时为桂香鸡的生产管理和育种提供了参考依据。     

渝东白山羊与波尔山羊杂交F1生长发育规律研究

采用Logistic、Von Bertalanffy和Gompertz 3种典型非线性生长模型分别对渝东白山羊与波尔山羊F1 0~6月龄体重数据进行曲线拟合分析。结果表明,Logistic、Von Bertalanffy和Gompertz 3种模型均能很好地拟合杂交F1生长曲线,但Von Bertalanffy在拟合效果和预测体重效果方面更佳。分析Von Bertalanffy模型拟合参数,发现拐点体重为6.501 kg,拐点月龄为1.292月,最大月增重为2.955 kg,成熟体重为21.994 kg。     

渝东白山羊与波尔山羊杂交F1生长发育规律研究

采用Logistic、Von Bertalanffy和Gompertz 3种典型非线性生长模型分别对渝东白山羊与波尔山羊F,0-6月龄体重数据进行曲线拟合分析。结果表明,Logistic、Von Bertalanffy和Gompertz3种模型均能很好地拟合杂交F．生长曲线,但VonBertalanffy在拟合效果和预测体重效果方面更佳。分析Yon Bertalanffy模型拟合参数,发现拐点体重为6．501kg,拐点月龄为1．292月,最大月增重为2．955kg,成熟体重为21．994kg。     

闽南火鸡生长特性的研究

本试验观测了闽南火鸡的生长发育特性。应用三种非线性生长模型对闽南公，母火鸡生长曲线进行拟合，估测生长参数，以Von Bertalanffy模型的拟合度最高，公、母火鸡拟合度分别为0．999和0．996，说明此模型较好地反映了闽南火鸡的生长特点，结果表明，公火鸡生长速度明显快于母火鸡，公、母火鸡最大日增重分别为32．99g和19．34g，从60日龄开始公、母火鸡体重差异显著，210日龄公，母火鸡体重分别为5746.5g和2964．3g。成年火鸡体尺性状与体重经相关分析表明，公火鸡的体斜长，胸深，胸宽，龙骨长和体重呈极显著正相关；而母火鸡的体斜长，胸深，胸宽，骨盆宽，胫长和体重呈极显著正相关，以上结果为闽南火鸡的选择育和生长预测提供了科学依据。     

Conservation priorities and optimum allocation of conservation funds for Vietnamese local chicken breeds

The objectives of this study were to estimate conservation potential of Vietnamese local breeds and to investigate optimal allocation of conservation funds to maximize genetic diversity conserved between these breeds. Twenty-nine microsatellites were genotyped in 353 individuals from nine Vietnamese local chicken breeds and two chicken breeds of Chinese origin. The Vietnamese chicken breeds were sampled from the northern and southern parts of Vietnam while the two Chinese breeds have been kept as conservation flocks at the National Institute of Animal Sciences, Hanoi. The Weitzman approach was used to assess alternative strategies for conserving genetic diversity between breeds. Three different models, which reflect the range of possible functions in typical conservation situations, were applied. An average extinction probability of 48.5% was estimated for all Vietnamese chicken breeds. The highest conservation potential was found in the Te, Dong Tao and Ac chicken breeds, whereas the lowest corresponding values were observed in the Ri and Mia chicken breeds. The conservation funds were mainly allocated to the same three breeds (Te, Dong Tao and Ac) under all three models. This study suggests that conservation potential of the Vietnamese chicken breeds varies considerably. Population priorities for allocation of conservation funds in this study do not depend on the cost model used. The three breeds (Te, Dong Tao and Ac) with the highest conservation potential should be the prime candidates to be allocated conservation funds if the conservation budgets are limited.