icaster Farming, Saturday, June 12,1971 Lan 24 DAIRY BREEDERS. TAKE NOTE: USDA Begins Predicted Difference for Dollars and % Test Editor’s Note: The USDA re-in selecting sires based on both per cent test. While this has cently added some new statist!- PD. for milk and also P.D. for already been taken into con cal information on predicted per cent test. sideration m determining the difference of sires to show the Let’s look at two examples PD - for dollars, it deserves farmer how much a particular f rom the 1971 May report so ™ e separate comment. sire can mean to his herd. The j ac k and Joe. Jack has a P.D. p ® r - C -!? t 1 „ th! information should be of inter- f o r milk of +BBO and Joe has a most highly heritable of the est to all farmers who believe pd. for milk of +B7l. Daugh- economically important traits that a good breeding program teis of both these bulls should selected for „ , da * ry " l ®? l is a major factor in herd build- 0 n the average produce about (Hentability for test is esti ing and profits. The item was 880 pounds more of milk than m f^ d . to 9 ?f verses that of submitted by Gary Willier, ABS daughters of a breed average at district sales manager. bull (-P D of 0) no matter As with milk production, per _ . . 10 mn , t what kind of herds they are cent test is also greatly m- Each May while most Ui compa^d in So you can see fluenced by the environment in *“ rn , t 0 *Sved m they are both the right kind of which the cow finds herself. Be thoughts of those involved cause of this, it is extremely dairy cattle bleeding are apt to ' difficult to evaluate a bull’s toy to the May USDA DHIA Fh. h» : study of ttese too “ p“oent test by, AcUve AI Sire Summary L.st Mlo show. towew ; that Jack The Sire Summary is a report aasa 101 a “ D j leve l. A bull whose daughters card for all registered dairy “J s ®/mor e thJn produce 40 per cent milk in a bulls with more than 10 daugh- f J k Thi means herd where the average is 42 ters complehog recorts °”rage^P® cent „ probably hot a test vised by the Dany Held Im- daughters will return improver. However, a bull provement testing n °rS a ™ahons to their whose daughters average .05 across the nation The Sum- + th _ r ac k’« daughters per cent more than the average mary is published each year in owneis than Jack s * herdmates _ even January, May and September. As you can imagine, this is though the daughters may be The May report includes all Ac- due to the higher butterfat con- averaging only 3.8 per cent five Sires while the January tent of the milk which will be should be a real test improver, and September reports include produced by the Joe daughters. rphe p D f or per cen t test only those sires with pi oofs The va i ue 0 f the new P.D. estimates what future daugh significantly different from the f or dollars can be seen quite ters of a bull will test as com- May report. easily in this example. pared to the breed average. This year’s repoit has several This should prove to be an ex additions which can be quite ceptionally valuable tool for helpful to the dairyman mtei ested in selecting bulls to use in his herd. The USDA report compares production of all the daughters of a partrcular bull with that of their herdmates those ani mals in the same herd calving in the same month, two months before or two months after that particular daughter The evalu ation also compares the herd mates to the average of all cows of that breed and re gresses the result according to the number of daughters in volved, number of herds, etc The end result is a Predicted Difference an estimate of what future daughteis of this bull will produce compared to the average of the breed A Predicted Diffeience for pounds of milk and pounds of fat have been standard for several years. The 1971 May report also lists a Predicted Difference (P D ) for per cent test and for dol lars It is no great surprise that eows which give more milk make more money for their owners Bulls with a high P D for milk will sire daughters which will on the average make more money for then owners than will daughters of bulls with average or minus P D. for milk This is both logical and straight forward A more difficult evaluation, however, is the effect of the per cent test of the milk being pro duced. A cow producing 15,000 pounds of 3 8 per cent milk should return considerably more money to her owner than a cow producing 15,000 pounds 0f,3 2 per cent mlk Just how much more depends on the market and the butter fat dif ferential premium With the new P D for dollars, USDA has attempted to pro vide a guideline for dairymen Call Us Now Manheim, Ephrata and Akron subscribers and ad vertisers can avoid a toll call by calling us through 626- 2191. Just ask for Lancaster Farming Our main number is 394-3047. The second addition to the May USDA report is a P D. for NEW SILAGE MASTER from John Deere Medium-duty 35 big-harvester features, priced for average acreages Reverse knife sharpening (a John Deere exclusive) is built in maintains correct knife bevels. Cutting and blowing are separate— plenty of “blow” for filling long wagons. Wagon tongue is in-line with tractor drawbar—reduces side draft on hillsides and greasy ground. Recutter screens are available. Stop in soon for the rest of the story. A. B. C. Groff, Inc. M. S. Yearsfey & Sons New Holland 3544191 West Chester 696-2990 Shotzberger's Wenger Implement, Inc. Elm 665-2141 The Buck 2844141 Landis Bros. Inc. Lancaster 393-3900 those interested in improving milk will not make money for test in their herd. their owners. Any knowledgeable dairy- a great dfetf of man knows that there is more . . _ _ , to selecting bulls than simply money in preparing P.D. S for looking at production proofs, bulls available to dairymen. To Cows must not only milk well, overlook this information is to but should also last several lac- miss out on some of the most tations. valuable and useful tools avail- The fact remains, however, able in the breeding of a more that most cows which don’t profitable herd of cows. HEALD MINI BRONC Get in on the fun now 4 HP 4 cycle Tecumseh Engine, 150 cc variable speed Torque Converter Drive. Frame blue, engine & fenders white, front and rear 15x600x6 stud ded tires, alternator, lights, front shocks optional. Do it yourself kit $178.00. Assembled ready-to-go $2OB. v \ \ ' A. L. HERR & BRO., Quarryville, Phone 786-3521 or STEVE HERR, Kirkwood, Phone 529-2367 FARM TIRE SERVICE Call us ... for fast action. Fully equipped truck for on the farm or in the field. SWEIGART FIRESTONE 329 W. High St,, Manheim, Pa. Phone 665-2258 or 665-3603 CORN STARTER PESTICIDE NEEDS AND TOP DRESS FERTILIZERS SEE FARMERS' FERTILIZER WORKS, INC Z. Phone 717-367-1211 1 365 W. Baiubridgc Street Elizabethtown, Pa. 17022
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