A treatment method for improving the effect of simultaneous estrus-timing insemination of dairy cows in summer
A treatment method and timing insemination technology, which is applied in the fields of medical science, animal delivery, animal husbandry, etc., can solve problems such as unsatisfactory effects of simultaneous estrus technology for dairy cows in summer, so as to improve the simultaneous estrus rate, improve breeding benefits, and save breeding costs Effect
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Embodiment 1
[0033] In this experiment, N-carbamylglutamic acid (NCG) was added to the diet of Chinese Holstein dairy cows at different times during the perinatal period to study the effect of N-carbamylglutamic acid (NCG) on the development of follicles and estrus of cows. In order to improve the problem of poor estrus effect of the existing estrus synchronization program in summer, and increase the milk production of dairy cows. A total of 169 healthy pre-peripartum Holstein cows in good body condition were selected, and the cows were randomly divided into 4 groups according to the principle of age, weight, parity, milk production in the previous lactation period and the expected date of delivery. From the 260th day of embryonic pregnancy or 20 days before the expected date of delivery to different times after delivery (15 days, 30 days, 50 days), NCG 20g / head was added to the daily diet. Experiment Ⅰ started 20 days before delivery, added 20 g of NCG to the basal diet every day, and con...
Embodiment 2
[0044] For the four groups of experiments in Example 1, the milk production at the initial stage of postpartum lactation was measured, and the milk production on the 5th day, the 10th day, the 15th day, etc. were detected by analogy every 5 days, and the cows were supplemented with different NCG The effect of time on the milk production in the early stage of postpartum lactation is shown in Table 3, and the daily milk production is as follows image 3 shown. The results showed that the average daily milk production of dairy cows showed a gradual increase trend in the first 20 days after calving. From 20-25 days, the milk yield of the 20g / 70 day experimental group was significantly higher than that of the control group (P0.05). The 20g / 70 day experimental group III had Trend above 20g / 35 days. On the 30th day, although there was no significant difference between the groups, the treatment group was higher than the control group. On the 40th day and 45th day, the supplementary...
Embodiment 3
[0056] For the four test groups with different days of NCG supplementary feeding, lipoprotein esterase, aspartate aminotransferase, urea, and nitric oxide were measured one day before the simultaneous estrus treatment, on the day of mating, and 50 days after mating. The results are shown in Table 5 , different supplementary feeding times of NCG had no significant effect on the concentrations of lipoprotein esterase, aspartate aminotransferase, urea, and nitric oxide indicators on the day before the synchronous estrus (P>0.05), but there were significant differences in arginine and blood sugar in different supplementary feeding groups ( P<0.05), wherein the test group III of the blood glucose index concentration of 20g / 70 days was significantly higher than that of the test group I of 20g / 35 days (P<0.05), but there was no significant difference between the control group and the test group II of 20g / 50 days difference. The test group III with arginine index concentration of 20g / ...
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