【摘要】 本研究旨在比较舍饲与放牧条件下新疆褐牛乳成分的差异,分析乳成分变化的规律及产奶量、乳脂率、乳蛋白率之间的相关性。试验选用昭苏县草原放牧新疆褐牛52头和乌鲁木齐种牛场舍饲新疆褐牛154头,跟踪测定其产奶量、乳成分。结果显示,新疆褐牛放牧条件下主要乳成分指标极显著高于舍饲条件下(P<0.01);产奶量与乳脂率、乳蛋白率呈负相关,相关系数分别为-0.174(P<0.01)、-0.245(P<0.01);乳脂率和乳蛋白率呈正相关,相关系数为0.411(P<0.01)。因此,新疆褐牛舍饲条件下产奶量高于放牧条件下产奶量;除电导率和体细胞数外,新疆褐牛其它乳成分指标在放牧条件下均高于舍饲条件下。更多还原

【Abstract】 This experiment was conducted to study the variance of milk composition between grazing and barm feeding Xinjiang brown cattle,analyzed the change trend of milk composition and the correlation of milk production,fat percentage and protein percentage.Fifty-two Xinjiang brown cattles from Zhaosu grassland and one hundred fifty-four lactating cows from Urumqi cattle breeding farm,were randomly selected to monitor milk yield and milk composition.The results showed that the index of milk composition in grazing Xinjiang brown cattle is obviously higher than barn feeding Xinjiang brown cattle.There was highly significant(P<0.01).The relationship between milk production and fat percentage,protein percentage is negative correlation,and the correlation coefficient is-0.174(P<0.01),-0.245(P<0.01),respectively.The relationship between milk fat percentage and protein percentage was positive correlation,and the correlation coefficient is 0.411(P<0.01).These results indicated that milk production of barn feeding Xinjiang brown cattle is obviously higher than grazing,milk composition of grazing Xinjiang brown cattle is higher than barn feeding except for electrical conductivity and somatic cell count.更多还原