INCREASING THE LEVEL OF FERTILITY IN COWS BY HORMONAL TREATMENT
Blerta Mehmedi, Taulant Kastrati, Luigj Turmalaj, Klajdi Nallbani
University of Prishtine, Faculty of Agriculture and Veterinary,
Boulevard “Bill Clinton” nn., 10000 Prishtine, Kosovo
blertamehmedi@yahoo.com
With this study we aimed at assessing the hormonal stimulation in favor of improving fertility in cows. In Kosovo most bred cows are the breeds of Simmental and Holstein. For various reasons, often the level of expression of estrus is limited and its discovery is hard for the farmers. This leads to the extension of service periods and therefore it is associated with economic losses in production as well as reproduction. In order to avoid this consequence we did this experiment by hormonal stimulation of estrus (estrus synchronization) as follows. For this study we selected two farms with cows of the breed Holstein (each with 15 heads), where two groups were formed, where the group A was considered the experimental group and B the control group. Cows are from the age of 3‑6 years and have approximately same conditions of treatment and management. All cows in the study have had a normal parturition and without infections after calving. The treatment of the group of cows in this experiment was done 60 days after calving as follows. The hormonal treatment involved a combination of hormones progestagen (CIDR) with Prostaglandin (Dinolytic®). The coil stayed 7 days in the vagina when we removed it, we injected PGF2 alpha (25 mg Dinoprost). The control group received no special treatment. The study was focused on the degree of estrus expression in percentage, the estrus expression in hours after treatment, the rate of fertilization with the first artificial insemination and the index of insemination. As for the control group we estimated the service period, the rate of fertilization with the first insemination and the insemination index. From the data of the study above indicators for the group of experiment showed that the degree of stimulation and synchronization of estrus was 93.3% (14/15), the average time of estrus performance 64 ± 8 hours and the rate of fertilization by the first insemination 71.4% (10/14). The insemination index gave us the result of 1.3 doses of semen spent per pregnant cow. The data for the control group gave us the result that the service period was 128 ± 14 days, the rate of fertilization with the first insemination 52% and the insemination index 2.2 doses of semen doses per cow were spent. From the above data we conclude that the hormonal stimulation of cows above 60 days after calving significantly improves their reproductive performance.
Keywords: stimulation; service periods; estrus; fertilization
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