高寒地区无角陶赛特与青海半细毛羊杂交一代羔羊生长发育模型

Study on Growth Fitness Models of the F1 Lambs of Poll Dorset and Qinghai Semi-Fine Wool Sheep in Qinghai Plateau

采用Gompertz模型、Logistic模型拟合了无角陶赛特与青海半细毛羊杂交一代羔羊和青海半细毛羔羊的早期生长发育过程。结果表明:2种模型的拟合度均在0.98以上,拟合效果好,其中Gompertz模型在拟合度和预测体重效果方面最好。因此,采用Gompertz模型进一步估算了杂一代羔羊的拐点体重、拐点日龄、相对生长率(RGR)、瞬时生长率(IGR),结果表明:无角陶赛特杂一代羔羊早期生长发育强于青海半细毛羔羊。

The early growth process of both crossbred F1 lambs of Poll Dorset and Qinghai Semi-Fine Wool Sheep and lambs of Qinghai Semi-Fine Wool Sheep was studied by fitting of Gompertz and Logistie models,The results showed that the fitnesses （R^2） of two models were above 0.98,of which the Gompertz model had both higher R^2 value and better prediction effectiveness of body weight. As a result, Gompertz model was used to estimate the parameters of maximum body weight, infleetion agebody weight at inflection age, instantaneous relative growth rate （K）, relative growth rate （RGR） and instantaneous growth rate （GR）. Consequently, the crossbred F1 lamb grows more rapidly than that of Qinghai Semi-Fine Wool Sheep.