不同胎次荷斯坦牛泌乳量的变化规律研究

Study on the Effect of Parity on the Milk Production of Holstein Cows

通过研究不同胎次荷斯坦牛泌乳量的变化规律,为云南地区牧场生产规划提供依据。本研究采集相同饲养条件下150头荷斯坦牛泌乳量数据,分析胎次对泌乳期、不同泌乳阶段、不同泌乳月的日均泌乳量的影响,寻找胎次与泌乳量之间的变化规律。结果表明:胎次对整个泌乳周期、泌乳阶段、泌乳月的日均泌乳量均有显著影响(P<0.05);日均泌乳量以第4胎奶牛最高,泌乳量随胎次增加均呈现先上升后下降的趋势;同一胎次奶牛随泌乳月的增加,日均泌乳量呈现先增加再降低的趋势,泌乳高峰期出现在第2个泌乳月。胎次与日均泌乳量间的拟合方程为一元二次曲线。

In order to find the law of the influence of Holstein dairy cow parity on milk production,which provides a basis for the production planning of pasture in Yunnan.In the study,the lactation data of 150 Holstein cows under the same feeding conditions were collected to analyze the influence of parity on the lactation period,different lactation stages,and the average daily lactation of different lactation months,and to find the law of parity on the lactation change.The results showed that:the parity had a significant impact on the average daily lactation during the entire lactation cycle,lactation stage,and lactation month(P<0.05);the average daily lactation was the highest in the fourth-parity dairy cow,and the lactation rate showed the highest level with the increase in parity.As the milking month increases,the average daily milk production of the same parity cows increases first and then decreases.The peak of lactation occurs in the second lactation month.With the increase of parity,the lactation volume showed a trend of rising and then falling.The fitting equation of parity and average daily lactation was a quadratic curve of one element.