Lancaster farming. (Lancaster, Pa., etc.) 1955-current, November 26, 1994, Image 19
NEWARK, Del. A few /ears ago, here at the University )f Delaware, we conducted a esearch project on the protein imposition of milk and its rela ionship to blood type in Guernsey ind Holstein dairy cattle. We identified the distribution )f the many different proteins in nilk among genetically different ;ow families and found relation ships useful for selection. The study, which would not lave happened without the fore sight of dairy industry leaders such as Dr. James Deubler, New own, Atherton Hobler, of Prince on, N.J., Frank Brown of Port Deposit, Md. and Harry Haskell, }f Chadds Ford was conducted cooperatively between the Dela ware, Ohio and New Jersey exper iment stations. Now, new research in Canada and Europe has found that these different protein types in milk influence the making of cheese, which has immediate commercial interest. Overall, we can recognize at least four major milk protein fam ilies that make cheese, including Alpha-s-1 -casein, alpha-s-2-casein, beta-casein, kappa-casein; and at least four major milk protein fam ilies that do not make cheese-beta lactoglobulin, alpha-lactalbumin, immunoglobulin, serum albumin, which remain in the whey on cheese making, unless a whey cheese, such as ricotta, gjetost or mizithra, is made. Each of these protein families, except the last two, are subdivided into at least two and as many as six genetic variants and their com binations. cmmoAvmjEfwmmm HI-MAG gcLIMEj HI-CAL fZ** < %: ■■'ts Cash Discount Savings on Delivery For your convenience calls received Mon.-Sat. until 9:00 pm 1-800-724-3277 Serving PA, MD, Datmarva & NJ QUALITY MIXER AT A QUANTITY PRICE —Reel Auggie BUY A > £ 20()0 Series REAL m/v/ght Mixer Blender/Feeders Milk Protein These are based on small but significant differences in their amino acid composition, which cause them to behave differently on contact with digestive enzymes in the gastro-intestinal tract as well as under cheese-making con ditions with the rennet enzyme. Kappa-casein* for example, has the genetic variants A, B, C and E; therefore, cows or goats or sheep can have in their milk the follow ing 10 protein genotypes; AA, AB, AC, AE, 88, BC, BE, CC, CE. These genotypes are actually found in the various cattle breeds and families in different frequency. Among these 10 types, the BB seems to have specific commer cial value. When eight European dairy cattle breeds were tested, it was discovered that they differ significantly in the BB type: French Normandy, 44 percent; Jersey, 38 percent; Brown Swiss, 28 percent; Tyrolian, 23 percent; Gelbvieh, 23 percent; Danish, 11 percent; Simmental, 6 percent; and Holstein, 2 percent. .. The type AA was distributed with opposite frequency among these breeds. This is commercial ly interesting, because milk not only has differences in fat, pro 4 Research Reveals Potential tein, lactose, mineral contents, but varies in the percentage of casein in total protein, which determines how many pounds of cheese are possible form 100 pounds of milk. Furthermore, during cheese making, significant factors include the time it takes to precipitate the casein, the time it takes to firm the curd, the degree of curd firmness and the overall yield. It has been determined that the kappa-casein BB cows, as com pared to AA, have milk that has a 24 percent shorter cheese precipi tation time, 51 percent shorter curd firming time, 85 percent bet ter curd firmness, 0.2 percent units higher casein content and 5 percent higher cheese yield. The other types of C and E also are inferior to 88. It has also been found that beta-lactoglobulin BB cows have 3 percent more casein in their milk and a higher cheese yield compared to AA type cows, thus making beta-lactoglobulin as interesting for cheese making as kappa-casein. Again, the distribution for these BB types among European dairy cattle breeds differs signifi- 4584 Mean % advanl * Combined Penn State Commercial New Entries Invest your resources wisely, with vaneties that have a proven record of performance in the field Hoffman’s strong line of Funkls G® brand hybnds offers you significant improvements in yields and standability Early Maturity. A 98-day hybnd, 4273 delivers outstanding standability and drydown, and outperformed the mean by 3 5% Madium Maturity. 4394 produced a whopping 12 3% more than the average, Increase your com yields by 7% or more 1993 Penn; vama 173.1 162.3 0 Hoffman Seeds, Inc , Landisville, PA 17538 HIUhsI CaU Toll Ftaa: MOO-776-7929 Adding Value to your Seed Investment ly © 1994 Hoffman Seeds, Inc Brara Lancaster Farming, Saturday, November 26, 1994-Al9 cantly: Danish, 74 percent; Jer sey, 40 percent; Holstein, 35 per cent; Brown Swiss, 34 percent; Gelbvieh, 31 percent; French Normandy, 27 percent; and Sim mental, 26 percent. The other milk protein families and their genetic types are still waiting for research to be better understood. There is some discussion under way to include these genetic types in herd sire-selection programs and in milk payment plans. But routine rapid testing methods need to be developed first. Meanwhile, it is because of these long-year studies, including the one here at the University of Delaware, that we now have milk payment and id Com Performance Trials while combining outstanding standability, drydown and drought tolerance Rill Season Maturity. 4584 delivers exceptional gram quality and a 5 4% yield advantage over the mean It provides excellent standability and early vigor, as well as disease resistance So devote your resources wisely by choosing a field proven Funk’s G® brand hybnd. Contact a Hoffman sales representative for help in choosing the nght vanely for your operation sire proofs that include protein or solids-not-fat and somatic cell counts. These factors have served as a reward and incentive for dairy farmers to select in a specific direction, which also benefits processors and consumers through a better product. The combination of protein and somatic cell count is espe cially important, because with low somatic cell count, the cheese yield is higher than it is from the same milk, when the somatic cell count is high. Paying critical attention to the types, not just the amount of protein in milk, means differences in profitability for the cheese maker and, ultimately, for the dairy farmer. It does a body good.® 26.8 26.2