Show Find True Value o of Dairy air Sires Records Are N Now V O Being Used to Determine Real Worth of Bulls Prepared by the United States SIlles Department of Agriculture h herd association records are now being used to determine determine deter deter- mine the true ti-no value of dairy duh sites sires fU as aswell aswell well as to test cows for economical production Dr 01 T J. J C. C McDowell dairy husbandman and Mr W. W E. E associate dairy dah hus bus husbandman bandman bureau of dally dairy Industry United States Department of Agriculture ture tore have made nn an exhaustive study of the available association records and have drawn some shone striking conclusions conclusions con can elusions c concerning the use uso of or proved provell sires in herd In Circular No Nu C 3 entitled Proved Duh Dairy Dahy Sires Just Issued h by the lie department de der the au authors hors discuss the In In- of doh dairy sires on the production production tion of or their daughters comment on the tho problem of keeping the tho bulls until un nit- til t their hel r al value ue hits has been determined through the tile records of their daughters dough daugh tern tel's and point paint out the economy econom In tho tole th use uso of C feed d by hJ high producing high cows Dairy Sires Proved Up to the tile present time about dairy bulls hulls have been proved lI by com cant comparIng comparing paring tine the records of five he or more daughters of each cach sire with the records records records rec rec- of the dams chants of the daughters A much larger number of sires has hns been partially proved cd through a comparison compari son of or the records of n a smaller num number her ber of daughters with the records of their dams A comparison of Association records of daughters with those of their dams shows a gala gain of or 3 30 39 per percent percent cent In milk mill production and ond 51 per percent percent percent cent in production of butterfat by bythe bythe bythe the daughters over their dams This Timis Indicates that lint the thc herds In dalr dairy dalry- herd improvement associations are gradually heln being Improved e through the sires now used but the they ml might ht be lie Im Improved unproved un- un proved cd much more rapidly if Intelligently Intelli g gently selected proved pro sires were wel used In every herd For Far example tin the daughters of or 20 O proved pro hulls bulls e c excelled their dams darns b by 72 per cent In mill production and IO IUD per cent In hutt hut hut- production These gains art are about twice as ns great glent as ns those made h bythe hy by hythe the daughters laughers of average association asso asso- elation sires In both hath cases the dams dam were about equal In production above pounds of ot milk nail and above 3 30 O pounds of fat Sires mated with tribe cows of average production that thatis is with cows producing about 4 CM I pounds of milk and I ISO U pounds of hut but Increased the rte production of the daughters b. b by more titan than GO 00 per cent In both holh milk mill and butt butterfat erf at Sires to Rely On Only the best proved sires can cnn be h. relied on to tn Increase the production of slaughters daughters over that lint of dams having Navin n o yearly production of or pounds of butterfat The fhe average dairy herd herll may ma double Its production In two or three generations h hy by the use of good proved dairy dalry sires III producing High cows are economical econom teal ical In the use of feed say the au nu thors A tabulation of ot more than Individual Individual cow cots records showed that lint the cost of feed for cows producing producing ing pounds of milk a n year ear per cow was only about 40 90 per cent more than for cows producing but half as ns much A copy cop of the circular may mn he oh oh- tamed h hy by writing to the United States Department of Agriculture Washing ashin ton D D. C. C |