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7 > Image 7 of Kentucky farm and home science, vol. 7 No. 3 summer 1961

Part of Kentucky Agricultural Experiment Station

_ plus the help of a financial grant from the Kentucky average dressing percent was 63.52; and the average i 45 Department of Economic Development, the Station carcass grade was Choice minus (12). decided to try faster aging methods. The most significant part of this whole project lies v Four temperature-humiditycontrolled aging cabi- in the fact that considerable variation in average daily i ,* nets were built so that temperatures could be main- gains was eliminated through the use of half-brothers. tained as high as 110F. Hams, after normal dry-cur- This represents a practical compromise of the re- . ing and smoking, were placed in these cabinets at searchers ideal which calls for the use of identical Y temperatures of 80, 90, 100, and 1I0F, respectively, twins for nutritional research. By using half-brothers, with a relative humidity of approximately 55-65 per- small but real differences due to tested items can be . A cent. Humidity control is important, as increased uncovered with fewer steers and less repetition of re- ii shrinkage occurs at lower humidities and excess mold searchwith a consequent saving in time and money. growth occurs at high humidities. So far as can be determined, this is the first and only ` Hams were removed from the cabinets at monthly time that a land grant institution or commercial re- . intervals, analyzed for fat characteristics, and tested search establishment has ever used 80 halfbrothers for ' i I b` by a palatability panel. The results were variable. The steer feedlot research. ti highest temperatures were evidently too high because The project is continuing with over 100 sons of V the outside fat was discolored and overrancid. A few T B Zato Heir 181 headed for U.K. feed lots this fall. in hams spoiled, evidently due to being subjected too In addition, a smaller group of calves sired artifically g quickly to the extreme conditions. Some hams were by Big Foot Corrector, a $10,000 herd sire at Mere- V A excellent at 4 to 5 months, showing that fast aging is worth, will be purchased for U.K. research this fall. A it possible. Because too many hams were undesirable, In the fall of 1962, groups of calves sired by four s the initial test was regarded as only partially success- carefully selected Hereford bulls will be compared in ful. Therefore, modifications were made and new tests our feedlots and through a packing plant in an effort I C begun. to discover lines of Hereford breeding that combine . Je Present tests include hams being aged at 75, 85, 95, rate of gain, feed efficiency and desirable carcass char- jr dg and 105F as well as the 65 control hams. The hams acteristics in a high degree. Dr. Neil Bradley, of the It were kept in cure for a longer time to allow better Animal Husbandry Department, and the author are >J salt equalization. After smoking, they were placed in convinced that desirable eating qualities can be bred _ the 65 room for 2 weeks before being placed in the into beef cattle whereas, up to now, such qualities 1 warmer cabinets. After 3 months in the cabinets there have been fed into our cattle at a high cost, with a seems to be no spoilage. Palatability tests will be made resulting excess of carcass fat. Our belief is based on again soon. genetic research which shows that tenderness has a No definite recommendation can be announced yet. heritability index of 61%, ribeye area 69%, and dress- at Details will have to be worked out so that uniform, ing percentage 71%. i i consistent results can be expected. When and if this Other research has shown that ribeye area is closely A occurs, recommendations will be forthcoming. associated with cutout value in the beef calf. Every 3 additional inch of ribeye area means approximately $4 extra cutout value Jer 600- >ound carcass at resent Haulbrothcr Steers Used beef prices. Since iibeye aiea ranges from zi) to 16 aq (Continued from Page 5) inches per 600-pound carcass, it is evident that great Cb0iC minus according to tb Kntn01