胎次 meaning in English

parity

Only a few birth order affects were both sensible and reliable, and those seemed to be mediated by other variables .
只有少数胎次影响是合理的和可靠的，而这些影响看来还受其他变量的影响。
Research on analysis of enzyme activities in milk of white yak under different seasons and parities
季节和胎次对白牦牛乳中酶活性的影响研究
Results showed that there were an obvious relationship among abomasum diseases with raising management , parities , milk yield , and onset period
调查结果表明：饲养管理、胎次、泌乳量、发病时期与真胃疾病有较大关系。