. Bulletin of the Department of Agriculture. Agriculture; Agriculture. PRINCIPLES OF LIVESTOCK BREEDING. 55 reference. Since, however, it is not possible in most cases to separate clearly the effects of grading up from those of better feeding and management, it may be well to refer briefly to an experiment recently reported by McCandlish, Gillette, and Kildee, of the Iowa agricultural experiment station, in which this can be done. A number of scrub milk cows were brought to the station from a region of Arkansas in which purebred bulls had not been used. Then- average milk production was n
. Bulletin of the Department of Agriculture. Agriculture; Agriculture. PRINCIPLES OF LIVESTOCK BREEDING. 55 reference. Since, however, it is not possible in most cases to separate clearly the effects of grading up from those of better feeding and management, it may be well to refer briefly to an experiment recently reported by McCandlish, Gillette, and Kildee, of the Iowa agricultural experiment station, in which this can be done. A number of scrub milk cows were brought to the station from a region of Arkansas in which purebred bulls had not been used. Then- average milk production was not known but was doubtless much less than that which was obtained from the same cows under careful. ^r fC3jS*<v-« -cif, •:*?:*---t-\ -? {Ka^-l'---^-*1- Fig. 16.—A Guernsey bull of excellent type. management at the station. Five of the cows were mature, 2 were 4 years old, and 7 either were very young heifers when obtained or were born at the station. These scrubs were bred to purebred bulls (Holstein, Guernsey, and Jersey), none of which were high priced. The records, all made under the same conditions, ma}^ be summarized as follows, after making the proper correction for age: Effect of breeding scrub milk cows to purebred bulls. Description. Cows Lactation Average pounds milk. tested. periods. 5 15 3,169 2 15 3,598 7 28 4,036 13 40 5,556 0 6 8,402 Average pounds butterfat. Scrubs—mature when Scrubs—4 years old when obtained Scrubs—developed at station One-half pure blood Three-fourths pure blood 154 166 191 253 358. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original United States. Dept. of Agriculture. [Washington, D. C. ?] : The Dept. : Supt. of Docs. , G. P. O.
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