Influence of bioclimatic factors in tied dairy cow system on health, production and reproduction parameters | Uticaj bioklimatskih faktora u vezanom sistemu držanja mlečnih goveda na zdravstvene, proizvodne i reproduktivne parametre
2009
Petrujkić, T., Fakultet veterinarske medicine, Beograd (Serbia) | Bojkovski, J., Fakultet veterinarske medicine, Beograd (Serbia) | Petrujkić, B., Fakultet veterinarske medicine, Beograd (Serbia) | Jeremić, I., PKB Korporacija, Beograd (Serbia) | Polovina, M., PKB Korporacija, Beograd (Serbia)
On high productive dairy farms, during all year round it can be seen that acting of bioclimatic factors leads to individual and herd disorders, by acting on health and reproductive parameters, accordingly lead to temporary infertility and lower conception. Dysfuction of ovaries, subclinic cases of endometritis, disorders in reproduction cycle, disorders in ovulation and repeated heats have been recorded mostly during summer. Longer service period was notices as well as increased insemination index and lower fertility during summer time (June, July and August). Heat stress when temperature exceed 27 deg C disturbs mechanisms of health and reproduction control and lead to lower milk production and reproduction in high productive dairy farms. During this period influence of bioclimatic factors can easily be seen and leads to lower fertility in both systems of husbandry (free or tied). In our paper we have monitored and analysed fertility in total 5272 dairy cows as well as influence of bioclimatic factors on fertility during summer time.
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