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1 THE INFLiYENCI O f THE K I N D AND Q U A N T I T Y OF F A T I N THE D I E T ON PORK CARCASS Q U A l l T Y 157 This subject is one which has received a t t e n t i o n a t various i n t e r vals over a considerable period of time. Early work d e a l t with the softening e f f e c t of peanuts, l a t e r the influence of soybeans and soybean o i l on the firmness of pork f a t were studied and more recently t h e e f f e c t s of animal fats. As indicative of t h e thinking of t h e times, much of t h e e a r l i e r work d e a l t mainly with t h e firmness of t h e f a t produced, whereas, later studies have considered the amount of fat deposited i n the carcass as well. It would appear t h a t t h e t o t a l l e v e l of fat i n swine r a t i o n s has been on the decline over t h e p a s t several years. This is due t o t h e more complete extraction of oil frm high protein meals of plant o r i g i n ad well as from animal by-products used as swine feed. In addition there is evidence indicating t h a t most modem high yielding hybrid corns a r e lower i n both f a t and protein than corn was formerly. Milo, which is being grown and used f o r swine feed in increasing amounts, contains about twenty-five per cent l e s s f a t than corn. However, i n very recent months f a t s and o i l s have accumulated i n such quantities and p r i c e s have been thus depressed t o t h e point t h a t l a r g e quantities of animal fats are now available, a t p r i c e s permitting t h e i r use as anima3 feed. Dr. H. R. Owbill, Director of Research of the American Meat I n s t i t u t e Foundation has recently estimated t h a t surplus animal fats a r e available f o r use i n feeds, t o the tune of about 800 million pounds annually, The indications a r e that these fats can b e s t be used i n dog (Siedler and Schweigert, 1952) i n b r o i l e r (Schweigert, e t al., 1952) and i n swine feeds. Meat packers, renderers, feed mixers and feeders have recently shown considerable i n t e r e s t i n this subject. Thus, t h e problem of the influence of the kind and quality of fat i n swine reations on t h e quality of t h e carcasses produced is again a current one. Particularly, since there i s a tendency f o r t h e f a t t o become firmer as hogs become older and f a t t e r and OUT present trend i s toward younger hogs w i t h less finish. Anderson and Mendel (1928) pointed out that fats occurring i n t h e t i s s u e s and f l u i d s of a species may a c t u a l l y vary i n chemical composition a s w e l l as quantity. To what extent fats produced through synthetic procedures from Carbohydrate and p r o t e i n are uniform i n character was studied by these workers. When food f a t made up 60 p e r cent of the c a l o r i e s of t h e diet, t h e feeding of soybean o i l with an iodine number of L32.3 produced body fat i n rats with an iodine number of 122,5; corn o i l with an iodine number of produced fat with an iodine n&er of 11w and peanut o i l with an iodine number of 102*4 produced f a t with an iodine number of When s t a r c h provided 60 per cent of the c a l o r i e s the iodine numbers o f - t h e body fat ranged from 58 t o 63. After soft body fat had been developed, it was found that it could be hardened by feeding a r a t i o n r i c h i n carbohydrate and r e l a t i v e l y low i n fat. The change from one type of depot fat t o another could be brought about most rapidly by depleting the fat reserves p r i o r t o t h e change i n d i e t,
2 158 In studying the influence of certain feeds on the characteristics of the fat produced, Euis and Isbell (1926) found that the iodine nmber and refractive index values were excellent measures of firmness in pork fat. These workers found iodine for fat in common feeds as follows: Brewer's Rice 100, Corn 126, Soybeans 128, Peanut~~93.7,and Cottonseed Oil The refractive index of these fats at 40 C. were Brewer's Rice , Corn , Soybeans , Peanuts and Cottonseed 1,4620. The economic importance of the character of pork fat was pointed out in early work by Bankins and Ellis (1926). These workers point out the principal cause of s o f t pork was the amount and character of the fats present in the feeds used, with the grincipal causes of s o f t pork at that time being the feeding of peanuts. It was pointed out that the firmness of a hog carcass depends to a great extent on the firmness of fat and that sop-fats contain a higher m o u n t of unsaturated fatty acids than firm fats. Thus, iodine nmiber, a measure of unsaturz Tcm was G o %-measure of so%ness. r Hankins and Ellis (1928) later pointed out that the s o f t pork problem, formerly considered to apply only to tie peanut feeding areas, took on greater mortance with the increased production of soybeans in the late 1920'~~ At this time producers, packers and consumers were all concerned with the problem of s o f t pork from soybean and peanut fed hogs. These workers state, "!L'he soft pork problem is fundamentally a fat problem. When the fat of feeds is stored by the hog there is no essential change in its characterwere is enough fat in some istic with respect to character and firmness. feeds to account for all of that stored. Ih such cases the body fat closely resembles the feed fat. With feeds low in fat and high in carbohydrates there is little similarity between the fat consumed by the hog and that found in his body When a hog grows and fattens, normally, the rate of fat deposition graduaj-ly increases, Thus, while a low-fat feed may contain practically enough fat to fulfill the fat storage requirements of the younger pie, it probably will not contain enough for the older hog, fattening at a more rapid rate. The other nutrients, particularly the carbohydrates, must enter into fat formation to an increasing extent under these conditions. This results in the hog becoming firmer as it acquires weight and finish." - Ellis and Zeller (1930) found that a lack of fat in the ration did not influence the degree of finish on the cstrcass, for animals on low-fat diets synthesized and stored fat at a normal rate. As the pigs became older the body fat was more saturated and harder. Shrewsbury and Vestal (1941) fed six lots of pigs on rations ranging from O S to 20 per cent fat. At regular intervals during the course of the experiment animals were slaughtered and fat s q l e s taken and analyzed. Fat samples from animals receiving the 0.5 and 5 per cent fat rations were found to increase in firmness as the experiment progressed, while samples from those on the 10, 15, and 20 per cent rations became softer. In a replication of the previous work, (Shrewsbury and Vestal, 19421, soybean oil was used to raise the fat content of the rations. Differences in rate of gain were not large. The feed required to produce a pound of gain was 3.43, 3.17, 2.91, 2.78, and 2,70 pounds, respectively, for rations containing 0.5, 5, 10, 15, and 20 per cent fat. As the percentage of fat i n the ration increased the firmness of fat decreased. The 0.5 per cent fat ration produced uniformly firm carcasses v h i l e the 20 per cent fat ration resulted in s o f t oily carcasses. More than 5
3 159 p e r cent soybean o i l i n the r a t i o n was undesirable from the standpoint of carcass quality. In t h e work reported in 1943, by these investigators, the depth and length of carcasses was not a f f e c t e d by the fat content of t h e ration, b u t t h e t o t a l depth of backfat increased with increasing l e v e l s of fat i n the ration. Later Shrewsbury and Vestal (1945) fed r a t i o n s containing 0.5, t o 2.0, 3.5 and 5.0 p e r cent fat with t h e a d d i t i o n a l fat coming from soybean o i l. The a d d i t i o n a l f a t did not influence the rate of gain bud did reduce the feed required p e r u n i t of gain materially. Even these r e l a t i v e l y low amounts of soybean o i l produced notable softening e f f e c t s on t h e fat. The average r e f r a c t i v e index of the backfat i n d i c a t e t h a t 5 per cent soybean o i l added t o t h e r a t i o n produced s o f t e r body fat than the same mount of o i l contained n a t u r a l l y i n the feed. Robison a t the Ohio S t a t i o n (1943, 1946) studied t h e e f f e c t of rate of f a t deposition on t h e firmness of fat i n swine. Rations containing 2.6, 5.6 and 8.7 per cent fat were fed. Corn o i l was used t o alter t h e f a t content of t h e r a t i o n s. Each r a t i o n was fed t o two groups of' pigs with one being s e l f - f e d and t h e other one restricted i n feed intake. In t h e full-fed group differences i n rate of gain among l o t s were small, b u t differences i n feed e f f i c i e n c y were q u i t e l a r g e. In t h e limited f e d group differences i n rate of gain as w e l l as economy were significant. The f u l l - f e d pigs were as f a t a t 200 pounds as the l i m i t e d fed pigs a t 250 pounds. A t the same degree of f i n i s h regardless of w e i g h t o r length of feeding period there was l i t t l e difference i n the firmness of f a t of t h e f u l l - f e d and l i m i t e d groups. However, i n both groups t h e r e f r a c t i v e index became higher as t h e pigs became heavier and fatter. Increasing the percentage of o i l i n t h e r a t i o n caused the production of s o f t e r f a t on the carcass. The rate of f a t deposition, degree of f a t n e s s a t slaughter and weight influenced t h e firmness of t h e fat b u t not t o as great an extent as t h e o i l content of t h e r a t i o n. Hostetler, e t al., (1939) i n conducting i n v e s t i g a t i o n s t o determine how peanuts could best be used as hog feed and y e t not produce s o f t pork came t o the following conclusions: (1) The degree of firmness of a carcass i s estimated more accurately by either iodine number o r melting point than by r e f r a c t i v e index. (2) Adding cottonseed meal t o corn r a t i o n s raised t h e melting point of t h e fat produced. (3) A softening period (peanut r a t i o n ) followed by a hardening r a t i o n produced harder carcasses than a s i n g l e feedi n g period in which the same t o t a l amount of oil and s t a r c h was consumed. (4) Brewer's rice produces firmer carcasses than cofn i n hardening r a t i o n because rice is very low i n fat, containing only 0.6 per cent f a t. (5) Ln order t o feed a n appreciable amount of peanuts and s t i l l produce firm pork, the peanuts must be fed t o r e l a t i v e l y small pigs. Usually t h e animals had eaten the maximum allotrable amount of o i l by t h e time they had reached 80 t o 95 pounds. A t t h a t time it wa6 necessary t o change them t o a hardening ration. ( 6 ) Thirteen t o eighteen per cent cottonseed meal was t h e most e f f e c t i v e i n t h e hardening ration. (7) Adding cottonseed m e a l t o t h e peanut r a t i o n was not e f f e c t i v e i n hardening the carcass. (8) To produce firm c a r casses t h e gain in weight in the hardening period had t o about 3.5 times t h a t made in t h e softening period. Data collected by S c o t t (1930) indicated t h a t the percentage of fat i n f a t t y tissue increases w i t h increasing depth of backfat and the percentage of moisture and nitrogen decreases by a c o r r e s p o n d i a amount. Over t h e range i n backfat thickness from 1.9 t o 4.7 centimeters, i n 180 day old
4 160. hogs, the refractive index decreased from to 1,4597, the per cent of fat in the tissue increased from 91.3 to 94.2 and the per cent moisture decreased from 6.37 to 1.79 in back fat. These data show clearly that the certain characteristics of pork fat are closely related to the total fat in the carcass. Hughes of the California station (1937) conducted work on the effect of alfalfa pasture on the hardness of pork fat. He found no difference in hardness of fat between lots self-fed on alfalfa pasture as compared to those self-fed in dry lots. In this work it was observed that the Duroc consistently produced a firmer fat than Poland Chinas, The average refractive index for fat from Durocs was , and for Polands , In recent work at North Carolina.(Blumer, 1953) four lots of s i x pigs each were started at weaning on rations containing various levels of fat. Three pigs from each lot were killed at 140 pounds and the remaining three at 225 pounds. Lot 1 received the corn-soybean meal basal ration, Lot 2 the basal ration plus 10 per cent peanut o i l, Lot 3 the basal ration plus 10 per cent beef fat and I;ot 4 the basal plus 5 per cent beef fat and 5 per cent peanut oil. Measurements on average backfat thickness indicate that the carcasses from all lots receiving additional fat were fatter than those from the hogs fed the basal ration. Fat constants from samples of bacuat were not available, thus the influence of the fats added to the ration on the character of the fat produced could not be assessed. However subjective scores on the firmness of the fat indicated the basal ration produced the firmest fat and the ration with ten per cent peanut oil added produced the softest fat. In our own work (Hillier, 1953) four trials have been conducted in which various quantities of rendered pork or beef fat was added t o a corn soybean meal type ration. In the first trial the basal ration contained 1.40 per cent fat, Lard was added to the Qther rations to give a total of 3.5, 717 and 11.5 per cent fat in the other rations. Average daily gsins of 1.73, 1.79, 1.85 and 1.90 pounds were obtained from these rations i n the order of increasing fat levels on pigs over the period From 35 to 225 pounds, The feed required per pound of gain was 3.3, 3.5, 3.4 and 3.1 for the 1.40, 3.5, 7.7 and 11.5 per cent fat rations respectively. The carcasses from these groups of hogs ranged from 1.9 to 2.1 inches in average backfat thickness, from 43.5 to 46.1 in per cent of fat cuts and from 53.3 to 56.4 in per cent fat by chemical analysis, with the fatter carcasses coming f r o m the hogs fed on the higher level of fat. The average specific gravity values were 1,031 for the group on the low level of fat to for those on the highest fat level. These differences were all statistically significant. In trials 2 and 3 rations containing 1.46 and per cent fat were used. I n these trials average daily gains of 1.73 were secured on the low fat rations and 1.83 on the high fat rations. Those on the low fat rations consumed 3.5 pounds of feed per pound of gain while those on the high fat rations consumed an average of only 2.8 pounds for each pound of gain. The pigs fed the high fat rations produced carcasses that had 0.2 inches more backfat but did not appear to be much fatter than the carcasses from pigs on the low fat rations when one considers the percentage of fat cuts or specific gravity values.
5 . 161 In t r i a l 4 fat l e v e l s of 1.31 and were used. In t h i s t r i a l pigs on the low l e v e l of f a t gained a t t h e rate of 1.76 pounds d a i l y on 4.5 pounds of feed per pound of gain while those on t h e higher l e v e l of f a t gained a t t h e rate of 2.13 pounds per day on 3.1pounds of feed per pound of &sm. In t h i s trial the hl&er f a t r a t i o n s produced s i g n i f i c a n t l y fatter carcasses as indicated by every measurement used (backfat thickness VS. 1.9 per cent fat cuts 43.6 VS and s p e c i f i c gravity vs ) Fat constants were run on samples taken from carcasses produced on trials 2 and 3. I n t r i a l 2, where l a r d was used as t h e added fat, t h e iodine number of t h e backfat s q p l e s increased from 51.7 t o 62.8 with t h e increasing level of f a t i n t h e ration. A t t h e same time t h e melting point decreased from 40.6 t o 32.5 and t h e thiocyanogen number increased from 46.3 t o 54.8 with t h e increasing l e v e l s of fat i n t h e ration. In trial 2 i n which beef tallow was used as t h e added f a t t h e iodine number increased from 53.6 f o r backfat produced on t h e low l e v e l of f a t (no beef f a t added) t o 61.3 when about twelve per cent beef tallow was added, t h e m e l t i n g point decreased fram 40.0 t o 36.3 and t h e thiocyanogen number increased from 40.9 t o Considering t h e four trials, t h e addition of each per cent f a t t o t h e r a t i o n increased t h e average daily gai&-by 0. pg>unds and reduced t h e feeer%u@-ed-ger-pound of gain by about.6 pounds. There was no evxdence t o indicate that t h e reh-tionship between t h e l e v e l of f a t i n the r a t i o n and rate o r econonyqf-&a;lain was not linear. Each additional p e r cent of f a t i n t h e ratim &sed t h e carcasses t o measure.&&inches t h i c k e r i n backfat and t o have O$.g er e t more weight in the fa% cuts. REFERENCES CITED tion Ch-. 1. Anderson, William E. and Lafayette B, Mendel,1928. The RelaDiet t o the Quality of Fat Produced i n t h e Animal Body. Jour. B i o l. 76: Of 2. Blumer, T. N Private Comunication. 3. Ellis, N. R, and H. S. I s b e l l, The Effect of Food Fat Upon Body Fat, A s Shown By t h e Separation of the Individual Fatty Acids o f t h e Body Fat. Jour. Biol. Chem. 69: , E l l i s, N. R. and J. R. Zeller The influence of a Ration i n Fat Upon t h e Composition of the Body Fat of Hogs. Jour. Biol Chem. 89: LOW 5. Hankins, 0. G., N. R. E l l i s vestigations. U.S.D.A. B u l Results of Soft Pork In- 6. Hankins, 0. G., N. R. Ellis and J. H. Zeller sults of Soft Pork Investigations. U.S.D.A. Bul H i l l i e r, J. C Unpublished. Some Re-
6 Hostetler, Earl H., d. 0. Halverson and F. W. Sherwood, Production of Firm Pork from Peanut Fed Hogs. N. Carolina Agr, ~xpt.sta. Tech. Bul Hughes, E. H Hardness of Pork Fat as Affected By Alfalfa Pasture snd by Breed. California Agr. Expt. Sta, Bul Icraybill, H. R Private communication. 11. Robison, W. L Fat in Rations for Swine. Ohio Eqt. Sta. Bimonthly Bul. 28: Robison, W. L The Influence of the Rate of Fat Deposition on the Firmness of the Fat of Hogs, Ohio B u l Schwelgert, B. S., A. J. Siedler, L. R. Cugan, Jr. and J. F. Newer Use of Inedible Fats in Dry Dog Foods and Poultry Rations. American Meat Inst. Foundation Bul. No Scott, E. L The Influences of the Growth and Fattening Processes on the Q,uantity of Meat Yielded by Swine. Furdue Univ. Agr. EXpt. Sta. Bul Siedler, A. J. and B. S. Schweigert, Effect of the Level of Fat in the Diet on the Growth Performance of Dogs. J. Nutr. 48: Shrewsbury, C. L. and C. M. Vestal A Study of the Role of Fat in Swine Nutrition with Special Reference to the Factors Affecting the Quality of' Pork. Purdue Univ. Agr. Expt. Sta. An. Rpt. 54th p Shrewsbury, C. L. and C. M. Vestal Experiments Aim to Determine the Amount of Fat that is Optimum in the Swine Ration. Purdue Univ. Agr. Expt. Sta. An. Rpt. 55th.p Shrewsbury, C. I,. and C. M. Vestal, Continue Investigations on the Role of Fat in Swine Nutrition with Special Reference to the Factors APfecting Quality of Pork. Furdue Univ. Agr. Exp. Sta. An. Rpt. 56th pa Shrewsbury, C. L. and C. M. Vestal A Study of the Role Fat in Swine Nutrition with Special Reference to the Factors Affecting the Quality of Pork. Purdue University. Agr. Expt. Sta. An. Rpt. 58th p. 36. Of ne*, MR. KLINE: We are going to take up the carbohydrat picture and W. I,. Brown, of North Carolina is going to present the paper. #######
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