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    The effect of infection with bovine viral diarrhea virus on the fertility of cows and heifers
    (DE GRUYTER POLAND SP ZOO, 2006) Kale, M.; Ata, A.; Yavru, S.; Yapkic, O.; Bulut, O.; Gulay, M. S.
    In the current study, blood samples from 319 cows and heifers were studied. Antibodies against BVDV infections in serum samples and BVDV antigens in leukocytes were present in 203 (148 cows and 55 heifers) and 56 (28 cows and 28 heifers) samples, respectively. Although no significant difference was detected between seropositive [BVDV (Ag-/Ab+)] and uninfected [BVDV (Ag-/Ab-)] cows and heifers at the time of the first insemination (FIT), first service age (FSA) or conception rate (CR) (p > 0.05), the difference in age of seropositive and infection free cows differed significantly (p < 0.05). Furthermore, differences in FIT, FSA or age of seropositive and uninfected pregnant cows and heifers did not differ significantly (p > 0.05). Differences between persistently infected [BVDV (Ag +/Ab -)] and uninfected cows for FIT, CR and age were statistically different (p < 0.001). On the other hand, the difference between persistently infected and uninfected heifers for FSA or CR did not differ significantly (p > 0.05). Even though, FSA of pregnant persistently infected or uninfected heifers was not different (p > 0.05), there was a difference between the age and FIT of persistently infected and uninfected cows (p < 0.001). However, pregnancy was not detected in any of the persistently infected cows. In conclusion, seropositivity for BVDV did not affect fertility of cows or heifers. Although, differences in fertility between persistently infected and uninfected pregnant cows and between persistently infected and uninfected non-pregnant cows were present, fertility of heifers was not affected by BVDV persistency.
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    The effect of subclinical bovine herpesvirlis 1 infection on fertility of cows and heifers
    (DE GRUYTER POLAND SP ZOO, 2006) Ata, A.; Kale, M.; Yavru, S.; Bulut, O.; Buyukyoruk, U.
    The aim of this study was to determine the serological prevalence of bovine herpesvirus 1 (BHV-1), and describe whether natural subclinical infections will lead to fertility losses in dairy cows and heifers in Burdur, Turkey. BHV-1 prevalence was 11.94% (201/24) and 14.60% (89/13) in cows and heifers, respectively. Conception rate (CR) was higher in BHV-1 serologically negative cows (38.98%) than BHV-1 positive cows (33.33%) but the difference was statistically insignificant (P > 0.05). However, CR was higher (P > 0.05) in BHV-1 serologically positive heifers (84.61%) than BHV-1 negative heifers (56.57%). Average open days period (OD) of BHV-1 serologically positive cows (99.3 +/- 16 d) was different from BHV-1 negative cows (82.0 +/- 3.8 d) (P < 0.05). Average for the first service (FSA) of BHV-1 serologically positive heifers (18.01 +/- 1.1 mo) did not differ from BHV-1 negative heifers (18.0 +/- 0.3 mo) (P > 0. 05). Results of the current study showed that BHV-1 serologically positive cows have required for successful conception about 17 days more than negative cows.
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    Effects of subclinical bovine leukemia virus infection on some production parameters in a dairy farm in southern Turkey
    (AOSIS OPEN JOURNALS, 2007) Kale, M.; Bulut, O.; Yapkic, O.; Gulay, M. S.; Pehlivanoglu, F.; Ata, A.; Yavru, S.
    Some production parameters of seropositive cows (age, first calving age, 305 day mature equivalent last milk yield production, lifetime mature equivalent milk yield production, lifetime total milk production, lifetime total milking period, lifetime monthly milk production, lifetime daily milk production, lifetime total days of milking, number of inseminations per pregnancy (for last pregnancy), number of calves and calving interval (for last pregnancy)) were analysed in the current study. The study population was clinically healthy Holstein cows from a commercial dairy herd in southern Turkey. Of 109 animals, 65 cows were seropositive by ELISA and the prevalence of bovine leukemia virus (BLV) infection was 59.6%. The prevalence of seropositive cows in 2nd (62.8%), 3rd (64.7%), 4th (61.5%), and 5th (66.6%) lactations was slightly higher than that of cows in 1st (52.6%) lactations. No statistical differences were observed between BLV seronegative and seropositive cows for production and reproduction parameters analysed in this study (P > 0.05).