养奶牛为的是挤牛奶。在自然状态下,只有怀孕产犊后的奶牛能产奶。实际情况是只有百分之八十左右的母牛能生小牛、产牛奶。还有百分之二十左右的母牛只吃料不怀胎,也不产奶,被称为“废牛”。这给集体奶牛场和专业养牛户带来很大的经济损失。科教片《不生牛犊也产奶》给大家带来了喜讯,影片以翔实的事例介绍了浙江农业大学牧医系的科研工作者与生产单位协作,进行不孕奶牛人工泌奶和治疗奶牛不孕症所进行的科学实验及其取得的可喜成绩。他们根据孕牛体内激素促使乳房发育、泌乳的原理;为不孕奶牛注射雌二醇、黄体酮、利血平等外源激素,并具体说明了方法。例如按牛的体重来衡量肌定 Cows for milk is milked. In nature, only cows after pregnancy are able to produce milk. The reality is that only about 80% of the cows can produce calves and produce milk. There are about 20% of the cows eat only pregnant women without milk, nor milk, is called “waste cow.” This brings great economic losses to collective dairy farms and professional cattle farmers. The science film “Do not give birth to calves milk” brought good news to everyone, the film with informative examples of Zhejiang Agricultural University Department of Animal Husbandry, scientific research workers and production units in collaboration, infertile cow artificial milk and cow infertility treatment Symptoms carried out by the scientific experiments and its gratifying achievements. They are based on the hormone in pregnant cows to promote breast development, the principle of lactation; for infertile cows injected with estradiol, progesterone, reserpine and other exogenous hormones, and specifies the method. For example, according to the weight of cattle to measure myostatin