Visnyk LNAU: Agronomy 2021 №25: 167-171
IMPACT OF COWS FEEDING WITH PROTECTED FATS ON THEIR REPRODUCTIVE FUNCTION
Pavkovych S., Candidate of Agricultural Sciences
ORCHID ID: 0000-0002-0844-3071
Lviv National Agrarian University
Vovk S., Doctor of Biological Sciences
ORCHID ID: 0000-001-8387-1343
Institute of Agriculture of Carpathian Region of Ukraine
Balkovskyi V., Candidate of Agricultural Sciences
ORCHID ID: 0000-0002-3995-1909
Ohorodnyk N., Doctor of Veterinary Sciences
ORCHID ID: 0000-0002-7428-9973
Ivankiv M., Candidate of Agricultural Sciences
ORCHID ID: 0000-0002-4911-2877
Lviv National Agrarian University
https://doi.org/10.31734/agronomy2021.01.167
Annotation
The article presents outcomes of the research on the impact of feeding cows of the first lactation period with the animal protected fats in the form of calcium salts on the indices of their reproductive functions, such as insemination index, fertility after the first insemination, duration of the service period, calving interval, and the factor of reproducibility.
After calving, the cows suffer from the deficit of energy and rise their personal sources of energy. It causes reduction of their reproductive functions.
One of the ways to solve the energy problems in the cows feeding is to introduce fat supplements into their diet. However, a high content of fat in the diet of cows negatively influences the ruminal digestion. Therefore, to reduce the negative impact of fats, different methods of protection were used, including production of calcium salts of fatty acids.
The experiment was conducted on the Ukrainian black-spotted dairy breed of the first period of the third lactation in the winter-stall period. All animals were divided into three groups according to the analogue principles. The diet of the first group of animals did not include fatty supplements. In the diet of the second group, a share of grain mixture was replaced with a low-melting fraction of beef fat, whereas the third group was fed with the protected low-melting fraction of beef fat in the form of calcium salts.
Native and particularly protected animal fat in the form of calcium salts in the diet of cows causes reduction of their insemination index.
The calcium salts in the diet of cows increases cows’ fertility after the first insemination.
Introduction of the animal feeding fat in the form of calcium salts into the diet of cows definitely reduces duration of the cows’ service period.
The calving interval of cows, which are fed with the animal fat and particularly calcium salts, is reduced.
The factor of reproducibility of cows, which were fed with the protected fats in the form of calcium salts, was definitely higher.
Key words
animal fat, calcium salts of fatty acids, cows, reproductive function
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