钙锌混合剂对泌乳期奶牛生产性能及乳品质的影响

Effect of calcium zinc mixture feed on production performance and milk quality of dairy cows during lactation

试验旨在研究钙锌混合剂对奶牛生产性能和乳品质的影响。选取圈舍、胎次、泌乳天数相近的泌乳期荷斯坦奶牛180头,随机分为2组,每组90个重复。对照组奶牛饲喂全混合日粮,试验组奶牛饲喂全混合日粮+500 mL/(头·d)钙锌混合剂,连续添加3 d后停用4 d,持续35 d。结果显示:与对照组相比,试验组奶牛的饲料转化率提高2.18%;试验组奶牛的产奶量在第7、14、21、28、35 d以及全程分别提高0.35%、11.31%、2.89%、3.10%、1.83%、3.84%,第14 d奶牛的产奶量增加趋势较明显。试验组奶牛的乳脂率、乳蛋白略低;试验组奶牛的体细胞数、持续力略有升高;试验组奶牛的尿素氮略有降低;试验组奶牛的平均每天每头牛的经济效益提高8.24%。研究表明,奶牛全混合日粮中添加钙锌混合剂对饲料转化率无明显影响,具有提高产奶量的趋势,对乳品质无显著影响,可提高经济效益。

The experiment was to study the effect of calcium zinc mixture feed additives on production performance and milk quality of dairy cows. A total of 180 lactating period Holstein dairy cows with similar pens, parity and days of lactation were randomly divided into two groups, with 90 replicates in each group. The dairy cows in control group were fed with a full-mixed diet, and the dairy cows in test group were fed with a full-mixed diet + 500 mL/(head·d) calcium and zinc mixture, for 3 d consecutive, then stopped for 4 d, lasted for 35 d. The results showed that compared with control group, the feed conversion rate of dairy cows in test group was increased by 2.18%. Milk yield of dairy cows in test group was increased by 0.35%, 11.31%, 2.89%, 3.10%, 1.83% and 3.84% on the 7th, 14th, 21th, 28th and 35th day and the whole process, respectively. Milk yield of dairy cows on the 14th day increased significantly. Milk fat percentage and milk protein of dairy cows in test group were slightly lower. Somatic cell number and persistence of dairy cows in test group were increased slightly. Urea nitrogen of dairy cows in test group was decreased slightly. The average economic benefit in each cow per day of dairy cows in test group was increased by 8.24%. The experiment indicates that adding calcium zinc mixture in total mixed diet has no significant effect on feed conversion rate, tends to improve milk yield in a certain stage,which has no significant effect on milk quality, can improve economic benefit.