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• W2089508217 abstract "Summary A field study involving 164 parturitions in Jersey cows, all with previous milk fever histories, in 26 Ohio herds was conducted to obtain further information on how much vitamin D must be fed prepartal to provide maximum protection against milk fever. The assigned vitamin D dosage, 15, 20, or 30million units/day, was fed on a twice-a-day basis beginning approximately five days before the expected calving date and for one feed after parturition. If seven days feeding were completed before parturition, vitamin D feeding was terminated. On-schedule cows were those that received at least three days of vitamin D feeding and calved within one day after termination of vitamin D feeding. In all, there were 113 in the on-schedule group. In the off-schedule group ten cows calved too early and 41 calved too late. Three vitamin D concentrates were used: Viosterol (capsules), Type 142F Irradiated Dry Yeast, and Super Drex 3000. The average per cent protection for the three dosages, based on 64% milk fever expectancy in Jersey cows with previous milk fever histories, was 67.1% for the 15million unit level, 82.0% at the 20million unit level, and 79.2% at the 30million unit level. No statistically significant differences were found in milk fever incidence or per cent protection among the three vitamin D dosage levels. Vitamin D was fed for an average of 5.6 days (11.2 feedings) prepartal, including the day of parturition in the on-schedule group. Because the 15million unit/day dosage level resulted in a lower average protection than the two other dosages, it was considered unwise to recommend less than 20million units per day, until more numbers can be studied. There was no evidence, however, that 30million units per day would be more effective than 20million units per day. All three vitamin D concentrates used appeared to be equally effective when consumed. Certain cows did not accept irradiated yeast readily. The viosterol capsules had the advantages gained from forced feeding and Super Drex 3000 offered no palatability problem. Evidence obtained indicated that protection increased for the first three days of vitamin D feeding, remained at a high level after the third through the seventh day, and dropped precipitously after one day had elapsed following cessation of vitamin D feeding." @default.
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• W2089508217 date "1960-08-01" @default.
• W2089508217 modified "2023-10-18" @default.
• W2089508217 title "Studies of Milk Fever in Dairy Cows. VI. Effect of Three Prepartal Dosage Levels of Vitamin D on Milk Fever Incidence" @default.
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• W2089508217 doi "https://doi.org/10.3168/jds.s0022-0302(60)90291-5" @default.
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