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Загальна кількість знайдених документів : 4 Представлено документи з 1 до 4 |
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| 1. | 
Fodor I. The impact of twinning and stillbirth on reproductive and economic performance in large Hungarian dairy herds [Електронний ресурс] / I. Fodor, L. Kern, O. G. Varga-Balogh, Gy. Gábor, L. Ózsvári // Біологія тварин. - 2019. - Т. 21, № 2. - С. 21-24. - Режим доступу: http://nbuv.gov.ua/UJRN/bitv_2019_21_2_6 The aim of our study was to quantify the effect of twinning and stillbirth on the main reproductive parameters, and to estimate the resulting economic loss on large-scale commercial dairy farms. The data of 3,660 calvings that occurred on five large Hungarian Holstein - Friesian farms in 2016 and 2017 were analysed retrospectively. Information about twin calvings, stillbirths and uterine treatments were gathered. The main reproductive indices (i.e. calving to conception interval - CCI, services per conception - SPC, and first service conception risk - CR1) were calculated based on cow-level data. Statistical analyses were performed by using linear and logistic regression, and Dunnett-test. The economic losses related to twinning and stillbirth were estimated by partial budget analysis (1 EUR = 320 HUF). Overall, twinning and stillbirth occurred in 4,1 and 6,9 % of the calving events. Twinning was more likely, whereas stillbirth was less likely in multiparous cows (odds ratio [OR]: 4,18 and 0,64, P << 0,0001 and P = 0,0015, respectively). Following twin calving, CCI and SPC were increased by 12,8 days and by 2,8, respectively, whereas CR1 was reduced by 7,1 percentage points. Twinning caused an estimated loss of 50,4 EUR/case. The analysed reproductive parameters were not impaired after stillbirth. Although, the reduction of calf number and the excess semen usage led to 112,5 EUR estimated loss per stillbirth case, on average. Twinning and stillbirths are significant sources of economic loss on dairy farms, therefore, their prevalence should be reduced. | ||
| 2. |
Ivanyos D. Relationship between herd size, milking technology and milk production parameters on large-scale Hungarian dairy farms [Електронний ресурс] / D. Ivanyos, A. Monostori, Cs. Németh, I. Fodor, L. Ózsvári // Біологія тварин. - 2019. - Т. 21, № 2. - С. 32-34. - Режим доступу: http://nbuv.gov.ua/UJRN/bitv_2019_21_2_9 The aim of the study was to survey the milking technology on the large-scale (<$Esymbol У~50> cows) Hungarian dairy farms and to compare the different types of milking parlour with herd size, average daily milk yield, average daily milk production per each cow and average somatic cell count (SCC). The milking technology was surveyed by using a questionnaire on 380 large-scale commercial Hungarian dairy farms in 2017, and it was compared with the official farm milk production data of March 2017. Three herd size categories (Group 1: 50 - 300 cows, Group 2: 301 - 600 cows and Group 3: >> 600 cows) were set up and the relationship between milking technology, herd-size and milk production parameters were analysed by using two-way ANOVA and Tukey-test. In Group 1, 2 and 3 (1) the number of farms was 142, 142 and 96; (2) the average herd size was 165, 437 and 958 cows; (3) the average daily milk yield was 24,73, 29,42 and 32,25 kg; (4) the average daily milk production per each cow was 21,07, 25,83 and 28,49 kg; and (5) the weighted average SCC was 432,5, 412,7 and <$E341,9~times~10 sup 3>/ml. As the herd size increases, so does the average daily milk yield and the average daily milk production per each cow, however, the average SCC decreases significantly (P << 0,001). The type of milking parlour had a significant effect (P = 0,027) on the average SCC, and dairy units having herringbone milking system produced the lowest quality of milk with an average of <$E430,0~times~10 sup 3> SCC/ml. The type of milking parlour has an impact on milk quality, however further research is required in this regard. | ||
| 3. |
Ózsvári L. Evaluation of reproductive performance on large-scale Hungarian dairy farms [Електронний ресурс] / L. Ózsvári, I. Fodor // Біологія тварин. - 2019. - Т. 21, № 2. - С. 54-57. - Режим доступу: http://nbuv.gov.ua/UJRN/bitv_2019_21_2_15 | ||
| 4. |
Fodor I. Associations of reproductive management and performance in primi- and multiparous cows on large dairy farms [Електронний ресурс] / I. Fodor, Gy. Gábor, L. Ózsvári // Біологія тварин. - 2019. - Т. 21, № 2. - С. 99. - Режим доступу: http://nbuv.gov.ua/UJRN/bitv_2019_21_2_43 | ||
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