Simulation on Growth Rule of Yubei Small-tail Sheep Parts Size

MA Fashun; LI Jinping; YANG Xin

doi:10.19329/j.cnki.1673-2928.2016.06.027

Abstract：In order to grasp the growth rule of the parts body ruler about Yubei small-tail sheep. With four kinds of body size of body height, chest circumference, cannon and hip croop height for the material of Yubei small-tail sheep form 3 to 24 months old. The growth process of four kinds body size were fitted and the analysis individual with Logistic and von Bertalanffy. The results showed that the logistic and von Bertalanffy model can describe Yu?bei small-tail sheep's actual growth situation well, the goodness of fit were above 0.96, but von Bertalanffy model more in line with the actual growth, better simulation results. the R2 were 0.973, 0.973, 0.965 and 0.977 of four kinds body size of body height, chest circumference, cannon and hip croop height respectively. The correspond?ing body size limit parameter A respectively were 95.932, 115.826, 13.060 and 91.896, adjustment parameter B respectively were 0.168, 0.190, 0.205 and 0.149, instantaneous relative growth rate k respectively were 0.098, 0.069, 0.039 and 0.112, the biggest week growth respectively were 4.157, 3.577, 0.225 and 4.554 cm · w-1, the greatest daily growth rate respectively were 0.594, 0.508, 0.032 and 0.651cm·d-1. The von Bertalanffy model was the ideal mathematical model on growth rule of the four kind body ruler of yubei small-tail sheep form 3 to 24 months old. The absolute growth and the opposite growth conform to the growth general rule. These results could be used in feeding yubei small-tail sheep scientifically and also may provide the reference for the following re?search.