苜蓿干草添加量对奶牛生产性能及经济效益的影响

选取沧州奶牛养殖小区体重、产奶量、胎次、泌乳期相近的荷斯坦奶牛40头，随机分为4组，对照组日粮组成为秸秆加精料，试验组添加不同水平苜蓿干草，分析对奶牛生产性能及经济效益的影响。结果表明，试验组与对照组干物质采食量差异显著（P＜0.05），试验组产奶量显著提高，差异极显著（P＜0.01）；乳脂率有所降低，差异不显著（P＞0.05）；乳蛋白、非脂乳固形物极显著提高（P＜0.01）；体细胞数显著下降（P＜0.05）。添加苜蓿使牛奶品质得到明显改善。经济效益分析结果表明，日粮中添加苜蓿能显著提高奶牛养殖业的整体效益。

Effect of the Alfalfa Hay on the Production of Cows and Economic Benefit

40 multiparous，lactating Holstein cows were assigned to 4 groups according to milk yield，body weight，parity and days in milk with a randomized design. No difference was existed among groups. the control group diet include straw and concentrated feed, add different levels of alfalfa hay to the test group, analysis of cows production performance and economic benefits of the impact. The results showed that the test group and control group differences in dry matter intake significantly (P＜0.05), experimental group significantly increased milk yield, the difference was significant (P＜0.01),fat percentage reduction, the difference was not significant (P＞0.05), milk protein, non-fat milk solid was significantly increased (P＜0.01). Somatic cell count decreased significantly (P＜0.05).Adding alfalfa to the diet,the quality of milk to be significantly improved. Cost-effectiveness analysis showed that diets supplemented with alfalfa dairy industry can significantly increase the overall efficiency of cultivation, breeding chains.