66. P R O C E S S I N G A N D STORAGE PROBLEMS OF l A R D J. W . COLE U N I V E R S I T Y OF TENNESSEE 1.2 know that lard is one of the most economical fats witA, great shortening power and t h a t it i s a160 one of t h e b e s t all-purpose cooking f a t s , and e a s i l y digested. However, we all have seen l a r d t h a t was dark, having a more pronounced flavor and odor than is desirable, Just because a few sinple steps i n t h e processing were not followed. Preparation of Lard Stock Pork f a t t o be rendered should f i r s t of all be fresh and i n the best possible condition. The quicker i t i s rendered a f t e r c h i l l i n g t h e carcass, t h e b e t t e r it i s . I f pork f a t i s held under ordinary storage temperature o f 32 t o 35 degrees F. over f i v e t o seven days, t h e f r e e f a t t y acid content increases r e s u l t i n g i n lard with a lower smoke point and keeping quality, The smoke point (250-425 F.) i s quite important i n c e r t a i n types of cookery. A recent t e s t by Consumers Union has shown t h e smoke point of l a r d to be an average of 350 degrees F. as compared t o 400 degrees F . f o r most vegetable shortenings. Do not expose l a r d stock t o l i g h t and keep away from objectionable odors. Leaf and trimming fat can be blended; however, i n t e s t i n a l f a t should be rendered separately f o r l a r d of highest quality. Removal of t h e akin on l a r d stock i s recommended as too much rind may give lard a s o f t e r body and possibly a shade off t h e desired chalk-white color. After "rinding" the f a t should be cubed (1'' square) o r run through a of chopper. Grinding l a r d stock speeds up the rendering process. Remove t h e lean. Lean meat w i l l turn brown and c r i s p before the rendering process has been completed and will give the l a r d an o f f color. Rendering Proc ess Improper cooking has probably lowered the quality o f l a r d more than all other problems put together. Overcooking o r cooking a t high teuperatures w i l l increase f a t t y a c i d content and lower t h e keeping quality greatly. Most o f t h e o f f color i n l a r d i s caused by improper cooking. The steam jacketed k e t t l e w i t h steam pressure varying from 30 t o 50 pounds pressure i s a good means of rendering where such a k e t t l e i s available. The cooking temperature o f t h e l a r d should not exceed 240 t o 250 degrees F. a t any time during t h e rendering. S t a i n l e s s s t e e l , r u s t - f r e e iron, o r aluminum k e t t l e s a r e a l l s a t i s f a c t o r y f o r rendering. Do not use copper o r rusty iron containers as t h e r e i e a p o s s i b i l i t y that t h e fats will combine and form oxidative s a l t s t h a t lower t h e s t a b i l i t y of lard, I f steam i s not available and the open f i r e is used, frequent s t i r r i n g and hard wood t h a t w i l l give a uniform heat should be employed. Frequent a t l r r i n g tends t o speed up the rendering process with a more thorough job. The usual t e s t s f o r doneness are: (1) the cracklings become amber i n color and, i f t h e fat s t i l l has t h e rind, small white b l i s t e r s w i l l form on t h e skin surface; (2) when no moisture r i s e s from t h e l a r d . This can be teeted by passing a cold l a r d can l i d over the k e t t l e t o t e a t f o r condensation. 67. The hot l a r d should be s t r a i n e d through s u f f i c i e n t muslin o r cheeae c l o t h t o remove sediment, cracklings, and so f o r t h . When a l a r d p r e s s i s used t o remove all t h e fat possible, it, together with a l l of t h e u t e n s i l s f o r storing, should be scrubbed and dried. Any old o r rancid f a t on t h e containers will lower t h e q u a l i t y of t h e new l a r d and cause it t o d e t e r i o r a t e more quickly. Cooling Lard Cool t h e hot lard as quickly ae possible and stir frequently during t h e cooling process. Avoid beating o r whipping as t h i s w i l l introduce a i r which may shorten t h e keeping quality of t h e l a r d . I f l a r d i s not s t i r r e d , t h e l a r d o i l tends t o separate out from t h e stearin and causes a grainy t e x t u r e . Lard S t a b i l i z e r s A t this point reference i s made t o a recent release (1029 Nov. '48) from t h e o f f i c e o f K. F. Warner, Exteneion Meat S p e c i a l i s t , U.S.D.A. Subject: Lard S t a b i l i z e r s Many of you a r e asked questions about t h e use o f s t a b i l i z e r s i n lard t h a t i s rendered a t home o r i n locker p l a n t s . T h i s information from t h e Bureau of A n i m a l Industry was helpful t o me and we hope it w i l l be t o you. Rancidity i n l a r d i s due t o t h e chemical break-down o f some of t h e fats and t h e addition of oxygen. A i r , heat, l i g h t , and metal speed up t h i s process. Once l a r d has become rancid it has chaaged chemic a l l y . There i s no way t o r e p a i r t h e damage. To slow down t h e development of r a n c i d i t y i n lard t h e standard recommendations have been t o : Use clean, f r e s h f a t , render t h e l a r d thoroughly without over heating (under 250 degrees F.), pack i n sma1.1 containers, f i l l containers f ~ ( t ol d r i v e out a i r ) , seal cont a i n e r s , and s t o r e i n a dark, reasonably cool place. These recommendations stand and should be followed. I n addition we now have chemical s t a b i l i z e r s , which serve as antioxidants and delay r a n c i d i t y development even more. Among these are: Approved Lard S t a b i l i z e r s 1. Nordihydroguaiaretic acid. Sometimes c a l l e d "NDGA" Amount permitted by Meat Inspection Diviaion, B.A.1 of 1 percent, p l u s 5/1000 o f 1 percent c i t r i c acid. . ., 1/100 2 . Propyl gallate. Available under various trade names. Amount permitted by Meat Inspection Division, B.A.I. 1/100 o f 1 percent plus 5/1000 of 1 percent c i t r i c acid. , . Usually sold i n combination wlth another antioxidant Amount permitted by Meat Inspection Division, B.A.I., 2/100 of 1 percent. 3. Butylated hydroxyanisole. 68. 4. Thiodipropionic a c i d plus dilaurylthiodipropionate. Amount permitted by Meat Inspection Mvieion, B . A . I . , 1/10 of 1 percent (1/100 of 1 percent thiodipropionic acid, plus 9/100 of 1 percent dilauPylthiodipropionate). Not yet on t h e market, 5. Hydrogenated vegetable o i l . 4 t o 6 percent. These o i l s contain a small amount of n a t u r a l l y occurring antioxidants (Tocopherols) Recommended by t h e Bureau of Agricultural and I n d u s t r i a l Chemistry, U.S.D.A. . General Recommendations: 1. Approved s t a b i l i z e r s delay t h e development of r a n c i d i t y i n l a r d , are p r a c t i c a l t o use, and seem wiee t o recommend. 2 . The U.S.D.A. has no experimental experience with t h e various products and cannot compare t h e i r performance. 3. C i t r i c a c i d serves a s a eynergist. ivenese of the antioxidant. I t fncreaees t h e e f f e c t - 4 . Some other l a r d s t a b i l i z e r s a r e on t h e market. Read t h e i r l a b e l s and check t h e i r ingredients against t h e chemicals l i s t e d above. 5. Lecithin i e an e f f e c t i v e emdsifying agent. 6. Use commercial s t a b i l i z e r s as directed on t h e container. The uee o f eoda t o "sweeten" lard i s not recommended too highly, Potatoes have been suggested t o help s l i g h t l y rancid l a r d . Cook 3 t o 4 potatoes from every 10-15 lbe. l a r d u n t i l they become quite brown o r dark i n color. Carrote can be ueed i n place o f t h e potatoes. Storage Store i n a cool, dark place i n emall containers that have been comp l e t e l y f i l l e d and sealed. The storage temperature should be around 40 degrees F. and not over 60 degrees F. Poor keeping l a r d nay be caueed by: 1. Fat p a r t i a l l y rancid before rendering 2. F a t from underfiniehed hogs 3. Inauff i c i e n t rendering 4. Overheating and sediment 5. Poor containers and exposure t o heat and l i g h t 6. Too much beating o r whipping 7. Muety and other objectionable odor8 i n t h e etorage room 0 . Storage i n Temperature above 60 degrees F. 69. P r ob1ems - A s was s t a t e d i n t h e beginning - we know about l a r d a l l of i t s good points! However, we should face t h e g z a t e s t problem that confronts l a r d and t h a t i s t h e many forces behind t h e s h i f t i n g fats and o i l s p i c t u r e , The time has come f o r us t o caref'ully analyze "the handwriting on t h e ' w a l l " . Hogs are t h e chief converters of grain i n t o edible meat. Although they can p u t on more pounds of gain w i t h less feed than c a t t l e o r sheep, t h e y s t i l l cannot compete with c a t t l e and sheep i n u t i l i z i n g grasslands and what would otherwise be termed wasteland. More fats and o i l s can be produced from growing vegetable o i l s than through an acre of corn f e d t o hogs. Mr. Frank Kutich, college economist with Iowa S t a t e gives t h e following figures: 1 a c r e of Copra produces 2,880 l b s . Coconut Oil 1 acre of soybeans produces 200 l b s . Soybean O i l 1 a c r e U.S. Land produces 51 l b s . Lard (plus 190 l b e . pork) These figures bring up a new food-producing team t h a t t h r i v e s n a t u r a l l y i n l i q u i d pastures without depending upon t h e s o i l . T h i s new food team i s supposed t o l i f t t h e e f f i c i e n c y of food production t e n t o twenty fold. The f i r s t member o f t h i s team i s Chlorella, a green alga single c e l l e d p l a n t as i n pond scum. I n an acre of shallow pond, fed with common mineral8 and a common gas, many times as much basic food can be grown as on one a c r e of our best s o i l , And f u r t h e r experience with the " t i l l i n g " o f this new crop may w e l l bring r i c h e r harvests, The other member of t h e team i s a yeast c e l l . I t takes the place of t h e p i g i n making f a t s and p r o t e i n , I t does not depend upon t h e s o i l and works twice as e f f i c i e n t l y as t h e hog. T h i s new team i s not j u s t a laboratory idea but i s actually being used today t o help b e t t e r t h e d i e t of an ever increasing world population. Granted t h a t t h i s new team will never take t h e place Of a T-bone steak nor a l o i n pork chop. However, it may well develop i n t o another f a c t o r i n a slower denand for rendered pork f a t . Synthetic o i l s nade chiefly from petroleum are being used f o r soaps. Synthetic r e s i n s are replacing drying o i l s i n p a i n t s . More two-way o i l s are being used i n food production making f o r more competition f o r lard. Forty p e r cent of shortening and l a r d sold goes i n t o bakery products. Synthetic emulsifiers, o r so c a l l e d "bread softeners", have been developed t o cut t h i s 40 per cent f i g u r e down materially. T h i s age has been described among other things as " t h e ready-mix age". The housewife can buy p r a c t i c a l l y anything from soup t o cakes i n t h e package. Here again l a r d has been l e f t by t h e wayside i n favor o f vegetable shortenings. Recently, l a r d dropped i n p r i c e t o t h e point where i t w a s s e l l i n g a t half t h e p r i c e of most vegetable shortenings. S t i l l l a r d s a l e s d i d n o t boom nor are they booming now. Lard seems t o have l o s t ground with the American housewife o f today. Changing t a s t e s have h u r t l a r d while helping meat consumption. Southern people a r e changing over t o more r e d meat. That leaves more f a t backs t o go i n t o lard. What can be done about t h i s serious problem i n connection with pork f a t ? The recent butter-oleo f i g h t should prove t h a t nothing can be gained along these l i n e s . Suggestions have come from t h e Secretary of Agriculture 70. o f f i c e t o the e f f e c t that (1) i q r o v e d quality, ( 2 ) new uses, and (3) export markets may be the answer. The recent decision o f t h e government t o l i f t quantitative l i m i t a t i o n s on f a t exports can only be a temporary a i d . The o t h e r two suggestions a r e being followed and s t i l l o u r l a r d s i t u a t i o n i s not improving. What can w e do as " m e a t s " men? We a r e forced t o attack %he problem a t i t s source the hog. A meatier type hog sold at l i g h t e r weights seem t0 be a p a r t i a l answer a t l e a s t . I n order t o get t h e farmers t o produce t h i s kind of hog, we a r e going to be forced t o push hog buying on a more equitable baeie such as buying on carcass grades and cut-out y i e l d s . - The vice-president of one of the l a r g e s t packing companies i n the world recently said, would welcome an improved system of hog buying that would permit more refinement i n buying according t o cut-out performance". "------------- It is up t o us t o take advantage of t h i s kind of co-operation and push a program t h a t would help solve t h e g r e a t e s t problem of l a r d rendering too much low-priced l a r d . today - CHAIRMAN MILLER: M r . Cole c e r t a i n l y brought out some thought s t i m - u l a t i n g questions. t h i s discussion. John Christian from t h e University of Connecticut w i l l l e a d PROF. CHRISTIAN: Thank you, Mr. Chairman. T h i s paper on l a r d was very well done. T h i s l a r d export problem might be compared with a s p i r i n , It r e l i e v e s the s i t u a t i o n , but it does not cure it. I have t h e sanae problems i n my meats laboratory. We a r e t r y i n g t o produce a hog with a leaner, longer look. It does not produce as much l a r d , but, what am I going t o do with the lard I g e t ? The dining h a l l s w i l l not take it; you can not s e l l it t o t h e f a c u l t y wives, So I a m l e f t with about 50 pounds, and i n 80me cases, 300 o r 400 pounds. There i s no place t o put i t . I f i n a l l y sold it as waste f a t f o r about four and one-half cents a pound. Maybe some of you can help me out on my problems. Perhape some of you have questions t o ask M r . Cole on l a r d storage. PROF. ZIEGLER: Mr. Christian, I have a question t o ask Professor Tomhave, K e n Warner or anyone e l s e on t h i s Committee o f Judges: If I have my meat Judging team place t h e pork cuts according t o our trend of thought here, a r e you men going t o cut t h e i r more because they can not see the pork the way you a r e used t o h a v i n g t h e n l o o k a t it? I n other words, a r e you going t o penalize t h e boys on softness a s much a s you d i d heretofore, because you can not have unfinished pork and have firmness, unless you have it frozen. b Another point concerning t h e keeping of l a r d on t h e farm. We have been doing work on t h e canning of lard, and you talk about l i g h t . You w a n t t o keep l a r d away f r o m l i g h t . Well, we have had l a r d i n sealed quart j a r s i n t h e sun half t h e day, a t eighty degrees Fahrenheit r i g h t s t r a i g h t through. I n one year's t i m e that l a r d came out j u s t a8 sweet as any l a r d you w a n t , Now, where a r e you g e t t i n g a l l this l i g h t s t u f f from, that you had t o put it away i n t h e dark? The l a r d was freshly rendered l a r d from t h r e e 71. hogs that had been k i l l e d , and had beenchilled f o r W n t y - f o u r hours, and the jars were s t e r i l i z e d . The one jar was sealed, t h e other jar had a puncture i n e stored thean at 34O; t h a t ' s t h e l i d ; we put a hole i n it so it could get a i r . o W i n the r e f r i g e r a t o r . It fluctuated from 33 t o 38 Then we took it over t o We put it i n our the o f f i c e where our temperature normally runs around 72'. meat room where t h e temperature i s normal, 60 62' t h e year around. We put some i n zero storage; some on top of the lockers where it was r e a l hot, exposed t o l i g h t and also unexposed t o l i g h t . We had three samples. One was wrapped so t h e l i g h t could not g e t i n , - . Dr. Miller here i s t h e fellowvhomakes t h e f i n a l analysis on it, t h e peroxide values; t h e f r e e f a t t y acid determination. Then we make organoleptic t e s t s . And i n every case t h e l a r d t h a t was sealed from t h e a i r w a s good and sweet a t the end of one year, That which waa exposed t o a i r was unusable and inedible. Light did not a f f e c t the keeping quality of t h e l a r d . PROF, ERADY: posed t o l i g h t ? What about t h e l a r d that was not sealed t h a t w a s ex- PROF. ZIEGLER: I t was not any more rancid than t h e other. PROF. J3RATZT;ER: Did you have any frozen l a r d i n that? PROF. ZIEGLER: Yes, the l a r d was frozen; t h a t was zero. oxided value and f r e e f a t t y acid was f a i r l y low. PROF. EUITZLER: PROF. BUTLER: mediately a f t e r ? PROF. ZIEGLER: PROF. BUTI;ER: like that? PROF. ZIEGLER: PROF. BUTLER: PROF. ZIEGLXR: PROF. BUTLER: I t s per- Sealed and unsealed? When did you t e s t i t a f t e r breaking t h e seal? ImImmediately aPter . Did you test it again the day a f t e r , o r something That i s r i g h t . Again, and s t i l l it did not increase? We made the organoleptic t e s t about t h e day a f t e r . S t i l l sweet? PROF. ZIEGLER: Yes. We have also used NDGA, c e r t a i n percentages, and the one with the m a x i m u m amount of NDGA t h a t you a r e allowed t o use, t h a t l a r d of course, had lower free f a t t y acid content, lower peroxide value, lmt we did not f i n d t h a t it s t a b i l i z e d the l a r d too much when it was stored i n g l a s s j a r s . W e recommend t o the farmer, of course, t h a t he put about a threepound can of vegetable shortening in, and he w i l l say "What vegetable shortening?", and the quickest one we can think of i s Crisco, put it i n a 50-pound can o f l a r d , which does not sound very good t o the manufacturer of lard', because you a r e r e c o m n d i n g a vegetable shortening, but your own Federal Government brought t h a t point out; and if they do not do t h a t , we recommend t h a t they keep it i n small containers i n t h e r e f r i g e r a t o r . 72. If they have a cold storage place, put it i n 50-pound cans; f i l l t h e can t o the very top on a r e - f i l l , put a piece of w a x paper on it, fit the l i d down t i g h t l y over t h e waxed paper, and do not break t h e s e a l until they need it. Put it i n this storage, 33' t o 40' Fahrenheit, and t h a t l a r d w i l l come out i n great shape. Then we have other farmers who say "I never have any trouble with my lard." They a r e using it one year l a t e r . So I have had the p r i v i l e g e of t e s t i n g some of that lard, and t h e i r idea of wha.t good lard i s and mine do not correspond. MR. WARMER: Well, M r , Ziegler, speaking as one chemist t o another it seems t o me that you have proved that a i r oxygen i s a requirenow, ment i n the break-down of l a r d , and t h e r e a r e other agencies that speed up the oxidation of the lard, but they a r e normally n a t u r a l l y impotent i n the absence of a i r . Would that not be your concluaion, as a chemist? -- - PROF, ZIEGLER: PROF. HRADY: I believe - 80. That i s not what he said, though. I thought you said it did not make any difference whether you had t h e can sealed. PROF. ZIEGXEE3: Exposed t o l i g h t or i n the dark. PROF. BRAm: No, I say i f it is not sealed. That i s the question, PROF. ZTEGLER: I said t h e difference i n the chemical determination, f r e e f a t t y acid and peroxide was not s i g n i f i c a n t . PROF. ERADY: PROF. ZIEGLER: O r did not have any e f f e c t . Now, we have been doing t h i s work over two yeare. We a r e on our t h i r d year, and we w i l l see how i t will stack up again, But t h a t i s t h e way f o r a farmer t o keep lard, i n a can; seal it t i g h t , and anyway, you have it i n about t h e r i g h t amounts t h e r e have two-quart Jars, g l a s s j a r s . Cole here had i t i n that eealed t i n can there. That l a r d is i n - good shape, i n my estimation. PROF. BRAT-: T h i s question i s addressed t o the chemists i n t h e group: What can be done t o rancid l a r d t o make it sweet? Will carrots, potatoes o r cabbage sweeten i t ? I s t h e r e anything anyone has done t o sweeten up rancid l a r d , or i s it impossible? I personally have always maintained t h a t when l a r d i e rancid, it remains rancid, but I have heard a l o t o f arguments t o t h e contrary, and I was wondering i f anyone had done any work. PROF. ZIEGLER: I would say i f it contains over one p e r cent free f a t t y acid, you should make soap out of it. If it i s just s l i g h t l y tainted, you can remove t h e t a i n t by boiling it with f r e s h r a w potatoes. MISS BELLE LOWE: I t i s true though t h a t your potatoes w i l l increase t h e water content, and x a t e r content increases t h e free f a t t y acid again, so you have a cycle. PROF. ZIEGIJ3R: T h a t i s right. * PROF. COLE: 73. A vicious cycle. PROF. CHRISTIAN: A n y other questions? PROF. BRATZLER: Did you get that f i r s t question t h a t Mr, Ziegler asked on how much they are going t o cut these boys? PROF. CHRISTIAN: The question was directed t o t h e committee that i s t o meet some t i m e t h i s evening. PROF. BRATZLER: I a m sure t h a t a l l t h e meat coaches would l i k e t o get t h e i n s t r u c t i o n s c l e a r l y , PROF. ZZEGLEB: came t o it. I mentioned t h a t so they would remember it when they PROF. COLE: M r . Chairman, I would l i k e t o defend t h a t a l i t t l e b i t . I do not think that we have t o have s o f t hogs t o reduce t h e amount of l a r d . I a m g e t t i n g hogs t h a t have f a t backs i n excess of an inch and a half a t 225 pounds. They s t i l l have plenty o f quality and firmness, but t h e i r percentage o f l a r d i s too high, and I t h i n k t h a t i s t h e problem we ehuild aim a t f i r s t s t i l l keep our quality, but reduce t h e l a r d by about a t h i r d . -- PRGiF. BULL: Mr. Chairman, I do not have a question, but I would l i k e t o caution t h e younger men a b u t taking too seriously t h e swine-type demonstrations t h a t t h e packers are so w i l l i n g t o put on for you, I have been playing with swine work f o r a good many years,and I a m thoroughly convinced t h a t t h e producer would put out t h e proper type of hog t o produce t h e maximum amount of pork and t h e minimum amount o f l a r d i f t h e packer was paying the premium. Now they w i l l . t e l l you they w i l l pay t h e premium, and a few o f the smaller packers w i l l . We have had swine-type demonstrations a t t h e University o f I l l i n o i s . We had t h e head hog buyer of one o f t h e biggest plants here i n t h e Yards come dom and put on t h e demonstration t o prove t o t h e s a t i s f a c t i o n of everybody conmrned, including himself, t h a t t h e meat-type, medium f a t hog w a s worth more than t h e f a t hog. The same man would go back in t h e Yards t h e next morning and pay more money f o r t h e hogs that he had proved t o us, a couple of days before, were worth less money. I n other words, a s somebody s t a t e d a w h i l e ago, they w i l l buy these hogs. I t seems that many hog buyers are only i n t e r e s t e d i n g e t t i n g a high dressing percentage, which they claim lowers t h e i r cost on t h e hoof. We have t o s e l l hogs, so do not take i t too seriously. It has been going on f o r a long t i m e , and e t i l l n o t many packers are paying t h e premium f o r tht b e t t e r type hog. PROF. COLE: M r . Chairman, I would l i k e t o make one short statement i n r e b u t t a l t o t h a t , and t h a t i s t h a t I t r i e d t o present here t h e s h i n i n g f a c t s ia t h e o i l p i c t u r e . We have not always had synthetic fats, and we have not had t h i s new food producing team - however important t h a t is going t o be and we have not always had vegetable o i l s o r soybean o i l s produced cheaply, so I r e a l l y t h i n k t h e packers a r e a l i t t l e more earnest r i g h t nov-than they may have been i n t h e p a s t . They are a l i t t l e more w i l l i n g . If they say they a r e going t o give a premium they do i t . 74. PROF. BUTI;W: I resent t h i s use of t h e word “premium”. I do not think they a r e paying a premium a t a l l ; they a r e juet paying what t h e hogs a r e worth compared t o t h e other hogs. PROF. COLE: Call it d i f f e r e n t i a l . PROF. BUTLE3R: I think we ought t o drop t h i s business o f a because a premium involves the same s o r t of thing a s a prize, and it is not a premium a t all; it is j u s t a difference i n the r e a l value o f t h e hog. PROF. CHRISTIAN: W e l l , i f there a r e no more questions, I w i l l turn t h e program back t o Mr. Miller. CHAIRMAN MILLER: I wish t o thank a l l t h e speakers and diecussion leaders f o r staying r i g h t on Bchedule. We started a l i t t l e l a t e on t h i s part i c u l a r section, and we have ended up exactly i n t h e time a l l o t t e d , even though it i s a l i t t l e l a t e r than t h e program called f o r , I w i l l now turn t h e meeting back t o Chairman Tomhave. . . . Mr. Tomhave reamed the C h a i r .., The meeting adjourned a t 5:15 o’clock p.m. ### ...
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