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Extending records in progress to 305 day lactation production by using usa department of agriculture and modified extension factors


, : Extending records in progress to 305 day lactation production by using usa department of agriculture and modified extension factors. Canadian Journal of Animal Science 61(3): 523-530

Records in progress from Ayrshire, Guernsey, Holstein and Jersey cows calving at or after 36 mo. were used to predict 305 day milk and fat yield using USDA [USA Department of Agriculture] extension factors introduced in 1965. The results of the study indicate that these USDA extension factors consistently predict lower production from records in progress. A simple procedure was used to modify these USDA extension factors for use in Canada to eliminate the systematic bias. Both the actual and the modified versions of the USDA extension factors were compared on a new set of data. The modified extension factors were better than the 1965 USDA extension factors and are able to eliminate the systematic bias.


Accession: 005432742

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Related references

Batra, T.R.; Lee, A.J., 1981: Extending records in progress to 305-day lactation production by using 1965 USDA and modified extension factors. Records in progress from Ayrshire, Guernsey, Holstein-Friesian and Jersey cows calving at or after 36 months of age were used to predict 305-day milk and fat yield using extension factors introduced in 1965. The results of this study indicate that...

Batra T.R.; Mcallister A.J., 1980: Extending records in progress to 305 day equivalent by usa department of agriculture factors. Canadian Journal of Animal Science 60(4): 1070

Batra T.R., 1979: Use of usa department of agriculture extension factors for predicting 305 day use lactation production in dairy cattle. Canadian Journal of Animal Science 59(4): 821-823

Keown, J.F., 1972: Factors for extending in-progress lactation records to a 305 day equivalent. Extension factors, which differ from current USDA factors, were calculated from data compiled by the New York Dairy Records Processing Laboratory from 1959 to 1969, consisting of 204 558 complete Holstein-Freisian lactations in 2100 herds. The fac...

Keown, J.F.; Vleck, L.D.V.n, 1973: Extending lactation records in progress to 305-day equivalent. The data consisted of 204 558 complete Holstein lactations in 2100 herds, compiled by the New York Dairy Records processing Laboratory between 1959 and 1969. All lactations had to have a 9th or 10th test day to be complete. The generalised least-s...

Lamb, R.C.; Mcgilliard, L.D., 1967: Ratio factors to estimate 305-day production from lactation records in progress. Complete lactation records for 24, 602 Holsteins, 4,309 Guernseys, 1,878 Jerseys, and 892 Brown Swiss were used to develop rations to extend milk and fat records to 305 days. Breed, age, and season of freshening influenced the relationship between...

Schaeffer, L.R.; Burnside, E.B., .: Factors for extending incomplete lactation records. Records for 4917 Jersey and 35 676 Holstein-Friesian cows were analysed from 1965 to 1970. A multiple-trait generalized least squares analysis was utilized to calculate constants for estimating average daily milk and fat yields within 16 stages of...

D.C.H.; Ohh B.K.; Lee J.K.; Lee M.Y., 1986: Regression factors for extending partial lactation records. This study was carried out to estimate regression factors for extending partial records to 305-day records from data which were collected from 6 Holstein herds from 1969 through 1984. The records were pre-adjusted for the effect of herd, year, mon...

Vanvleck, L.D.; Henderson, C.R., 1960: Regression factors for extending part lactation records. Regression factors, for extending part lactation records, were developed from within herd analyses of monthly test-day records of 9, 036 Holstein-Friesian cows in 374 herds. Correlation coefficients for predicted on actual yield were computed usin...

Van Vleck, L.D.; Henderson, C.R., 1961: Regression factors for extending part lactation milk records. Regression factors for extending part lactation milk records are developed from the within herd analysis of age at calving and season of calving corrected monthly test day records of 9036 Holstein cows in 374 herds in 5 New York counties. The best...