奶牛日粮中添加油料籽实对牛奶品质的影响

选取年龄、体重、胎次、泌乳期和泌乳量基本一致的荷斯坦黑白花奶牛12头，随机分为3组，每组4头，第1组为添加胡麻组，胡麻的添加量为750g／d、头：第2组为添加棉籽组，棉籽的添加量为1000g／a、头；第3组为对照组，不添加任何油料，进行了日粮中添加油料籽实对奶牛产奶量及乳成分的影响研究，试验期共50d，其中预试期为15d，正试期为35d。研究结果表明，添加胡麻籽与棉籽分别提高4％FCM产奶量3．7％和3.5％，但两组与对照组之间差异均不显著（P〉0．05）。添加胡麻籽与棉籽均不同程度的提高乳脂率，胡麻组提高6．4％，棉籽组提高1．7％，但两组与对照组之间差异均不显著（P〉0．05）。胡麻组与棉籽组的乳蛋白率与对照组相比分别下降了1．9％和6．4％，但差异不显著（P〉0．05）。乳糖率两个试验组均比对照组下降了0．8％，差异不显著（P〉0．05）。乳中干物质胡麻组高于对照组，棉籽组略低于对照组，但差异不显著（P〉0．05）。

EFFECTS OF LIN SEED AND COTTON SEED ON MILK QUALITY IN LACTATING DAIRY COWS

Twelve lactating Holstein cows were divided into three groups (n=4) , control group and two experiments group, used in a feeding trial, to evaluate diet containing whole linseed and cottonseed on milk quality. In the experimental diets, whole linseed replaced the concentrate in control diet as same dose (750g/d), whole cottonseed replaced the concentrate in control diet as same dose (1000g/d). There was similar diet ingredient and feeding management in the trial. The results indicated that linseed and cottonseed increased the FCM by 3.7% and 3.5%, but there were insignificant difference among the treatments and control(pWTBZ]>0.05). The percentage of milk fat was increased by 6.4% and 1.7% respectively for cows fed whole linseed and cottonseed, but there were insignificant difference among the treatments and control(pWTBZ]>0.05). The percentage of milk protein was decreased by 1.9% and 6.4% respectively for cows fed whole linseed and cottonseed, but there were insignificant difference among the treatments and control(pWTBZ]>0.05). The percentage of milk lactose was all decreased by 0.8% for cows fed whole linseed and cottonseed, but there were also insignificant difference among the treatments and control(pWTBZ]>0.05). Total milk dry matter was insignificant difference among three different groups(pWTBZ]>0.05).