臺灣國際科展

Waits and Measures

科展類別
臺灣國際科展
屆次
2004年
科別
生物化學
得獎情形
第三名
學校名稱
Queen Charlotte Islands Secondary School
指導老師
Judy Gadicke
作者
Jamie Richardson

摘要或動機

Successful calving is measured by the safe delivery of a healthy calf. Any factors that\r
cause dystocia (difficult calving) are undesirable; as it will result in weak or dead calves, stress\r
dams and a decrease in profit to the rancher. The most often identified reason for dystocia are\r
calves that are too large at birth. Ranchers frequently use sires that will result in calves with\r
small birth weights that will be born easy. This is especially true when breeding first calving\r
heifers. The selection for small calves at birth results not only in less growth in the uterus but\r
also less growth after birth, which means less beef to sell. This means ranchers try to balance\r
reasonable growth and reasonable calf size when selecting their sires. Much data has been\r
published on birth weight and its selection.


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