Fertility of cows, depending on their productivity and fatness
Journal Title: Наукові горизонти. Scientific Horizons - Year 2018, Vol 71, Issue 9
Abstract
The article deals with the actual issues of reproduction of cattle. One of the main issues covered in this article is the dependence of fertility of cows on their productivity and fertility. The research was carried out in stages: 1 - determined the fertility of cows depending on productivity, 2 - fertility of cows depending on fatness . For research in the first stage we were formed 3 groups of animals on the principle of analogues. Their productivity in the first group was more than 35 kg, in the second within 34-25 kg, and in the third - less than 24 kg. Subsequently, each of these groups was divided into 2 subgroups for the period of calving - 45-150 days and 151 and more. During the 2nd stage of the research, we formed similarly the three groups of fattening. So, in the first group included animals with fertility up to 2.5 points. The second group was formed from animals with fecundity in the range of 2.6-3.5 points . In the third group, there were animals that had more than 3.5 points in fattening. Subsequently, each of these groups was divided into 2 subgroups for the period of calving - 45-150 days and 151 and more. In our research, we found that in cows with average productivity, fertility was higher than in high-performance animals of the first group in 5,4 times (p≥0,001), and in the second group probably did not differ. Fertility Cows of the first group with a productivity of 24 and less than kg / per day were 12.5%, their number was 4 times less than in the second group (p≥ 0.001) . In our opinion, this is due to the diseases of these animals, which resulted in a decrease in productivity. After 151 days of lactation, the fertility of cows with a productivity of 24 and less than kg / day was higher than the animals of the first group in 3.4 times (p≥0.05), but almost twice as low as that of cows with average productivity. Fertility cows after the synchronization of the ecstasy from 45 to 150 days of lactation was 35.5%, which is less than the duration of lactation over 151 days by 24.0% (p≥0.01), regardless of performance. The average fertility index of cows per herd was 48.5%. Cows with moderate fecundity (2.6-3.5 points) and above average over 3.5 points were almost the same in both groups and in general. In cows of groups 1 and 2, with a fertility of less than 2.5 balls, the fertility rate was in general 25.0-26.7%. The percentage of pregnant cows with such fecundity in these groups ranged from 1.4 to 6.5%, which is significantly lower than the average for groups and in general. In the second group of animals with fatness of 2.5-3.5 points , the cow fertility in the first group was 52.2%, and in the second group it increased by 30.2%, which was determined by the decrease in the milk productivity of these animals and the acquisition of the appropriate condition of fattening. At the same time, the number of single cows with such fatness in the first group was 19.4%, the second - 37.8%. In cows of group 3, fertility was higher by 16.7% during the period after calving more than 151 days. In the first group the percentage of single cows was 4.9% larger . The article describes the data that indicate that fertility In cows with a productivity of 35 - 24 kg for a period from calving 45-150 days was 25.8% (16 cows), which is 80% of all cows with a period of calving and 72.7% of fertilized cows in this group.
Authors and Affiliations
А. Krayevsky, V. Osmola, Yu. Musiienko, A. Chekan
Keywords
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- EP ID EP631669
- DOI 10.33249/2663-2144-2018-71-9-10-75-82
- Views 65
- Downloads 0
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