【摘要】 澳荷斯坦牛引进河南后,由于饲养方式的转变,其产奶能力有了较大提高。将228头试验牛分为高、中、低产3组,分别测定并比较其产奶性能的差异。结果表明:一胎305 d平均产奶量接近6 500 kg;牛群第1、第2胎各泌乳月平均日产奶量均以第2个泌乳月为最高;高产奶牛在泌乳期第1个月就表现出高产状态。高产牛群305 d产奶量与90 d产奶量、最高日产奶量、最高月产奶量都呈强正相关关系;中产牛群305 d产奶量与90 d产奶量、最高日产奶量、最高月产奶量呈低度相关;低产牛群305 d产奶量与90 d产奶量和最高月产奶量间存在强正相关关系,最高日产奶量与305 d产奶量间为低度相关。更多还原

【Abstract】 After been introduced into China,the milk performance of Australia Holstein had been enhanced greatly because of the changed raising ways.To detect the differences of the milk performances,228 cows were divided into the higher,middle and lower groups according to the cows’ milking rule and the milk performance.The results showed that the 305d mean milk yields of the first born were 6500 kilograms.For both of the first born and the second born,the lactating peak appears in the second lactation month,and the cows which had higher milk performance would be higher milk yields in the first month.For the higher yields group,the 305d milk yields,90d milk yields,highest daily quantity and the highest month quantity represents significant positive correlation.However,in the middle yields group,there was no significant correlation observed.Similarly,no significant correlation was observed between the 305d milk yields and the highest daily quantity in the lower yields group,but significant positive correlation was observed between the 305d milk yields,90d milk yields and the highest month quantity.更多还原