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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.

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