| Autor: |
K. J. O’Farrell |
| Rok vydání: |
1979 |
| Předmět: |
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| Zdroj: |
Calving Problems and Early Viability of the Calf ISBN: 9789400993174 |
| DOI: |
10.1007/978-94-009-9315-0_18 |
| Popis: |
A total of 104 British Friesian dairy cows were randomly assigned to induced and natural calving treatments. Fifty-one cows were injected intramuscularly with 40 mg of betamethasone between day 260 and 285 of pregnancy. Seventy-two % of these responded to one injection within 51.3 ± 36.1 hours. The remainder were retreated on the fourth day and calved within 40.8 ± 1.7 hours. Perinatal calf loss for treated and control groups was 7.5 and 7.2% respectively. Afterbirth retention occurred in 47% of treated and 4% of control cows***. The calving-to-service interval for treated and control cows was 64.5 ± 28.3 and 58.3 ± 18.2% days respectively. While the calving-to-conception inverval was 86.0 ± 32.1 and 73.1 ± 27.4 days respectively, seven treated and ten control cows failed to conceive subsequently. The calving-to-service and calving-to-conception intervals for treated cows which retained the afterbirth were 70.0 ± 32.8 and 93.3 ± 34.7 days respectively. The mean days pregnant at calving for treated cows was 274.5 ± 5.7 and calf birth weight was reduced on average by 0.30 kg per day advanced. Treatment did not lower Zinc Sulphate Turbidity levels in calves when compared with controls, nor did it influence the location length or yield of the cows. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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