Investigation Of Bovine Reproductive Performance And Research On Improving Conception Rate In A Large Dairy Farm

To enhance bovine reproductive performance is an important way for the improvement of the efficiency of dairy production. There are many factors impacting bovine reproductive performance, including genetic factors, environmental factors, disease factors and nutritional factors and so forth. In order to find means to improve cow reproductive performance, the investigation of postpartum reproductive status, common diseases of the reproductive performance of dairy cow breeding and impregnated effects of pharmaceuticals were conducted.1. Investigation on the postpartum reproductive performance in cowA natural, post-partum dairy cattle reproductive performance survey cows60days postpartum estrus rate gradually increased, showing significant differences between groups (P<0.01) postpartum cows. Performance of dairy cows more than60days postpartum estrus and ovarian activity status, postpartum reproductive state, more than60days starting the phenomenon of heat in general, while the ovarian stationary or cysts are less likely to estrus cow by the chi-square test, with the exception of cattle the proportion of differences significantly (P<0.01). Cows abortion period in a different month, the highest number of abortions of cows in the summer from June to August, which is the highest number of abortions in July2011, accounted for16.52%of the total number of abortions; during the winter from November to January the lowest abortion rate in November, December, the lowest number of abortions, accounting for only3.70%of the total number of abortions2. Relationship between postpartum diseases and reproductive performance in cowThe RFM(afterbirth retention) rate of premature cows rates up to42.19%, the smaller the impact of dystocia in dairy cattle RFM was8.59%, a significant difference (P <0.01). The occurrence of acute metritis of natural parturition cows was9.56%, whereas that of the RFM cow accounted for48.08%. The test results of the prevalence of significant difference (P<0.01). The average daily milk yield of cows in lactation the number of days difference between the smaller of the cow and the duration of relationship, the test of significant correlation test (correlation coefficient=0.598, P=0.582). The use of a dairy cattle breeding center on the determination results of a large ranch for three months milk DHI, and this the first time in three months to participate in the breeding of cows become pregnant status for statistical analysis. Milk somatic cell count of more than100million/ml cow conception rate are lower than the average conception rate of cows, but the first breeding pregnancy rate by the chi-square test of changes in milk somatic cell and postpartum cows were no significant differences (x2=8.78, P>0.05). In this paper the statistical analysis of a large dairy farms a year early lactation in different months of lactation mastitis incidence results show that at30days postpartum (lactation month) mastitis incidence rate of23.09%, chi-square test of each month postpartum30days of udder inflammation incidence rate differences (x2=253.05, P<0.01), especially after calving peak in September of mastitis-prone season, but the cow mastitis occurred number of times with empty pregnant day number, mating the number of in the present statistical analysis, no obvious correlation. Recessive cows metritis conception rate of the situation of direct factors of postpartum metritis of cattle and cattle hidden metritis as a reference, and to use of two different drugs to do with24hours after flushing the uterus. The results show that the conception rate differences of the three groups was significant (x2=14.30, P <0.01).Use Biomycin (?)+Metacam(?)group compared with the domestic oxytetracycline group, the conception rate differences very significant (x2=8.85, P＜0.01).1st group conception rate by21percentage points than in group2,71.2%, conception rate was significantly higher than that in the control group (P<0.01) conception rate reached close to healthy cattle.3. Effects of different treatments on bovine conception rate after matingTo improve the reproductive performance by changing endometrial microcirculation ways, the different treatments on the conception rate of cows with16to17days pregnancy recognition phase of the experiment using different drugs,14days after breeding cows fed or injected in order to regulate early embryonic and maternal pregnancy recognition signal, were set up experimental and control groups. The results show that the trials in Chinese herbal medicine,"Chai progesterone Dan" cows conception rate of the experimental group appeared more substantial rise in use of the use of vitamin, hormone drug injection in the experimental group were not played the role to improve conception rate, but showed some improvement. The above experimental groups by the chi-square analysis, the difference was not significant (P>0.05).