TEXAS AGRICULTURAL EXPERIMENT STATION H. D. LEWIS, Director, College Station, Texas gnaw“ 73a LAMB FEEDING TRIALS in the EL PASO VALLEY, 1947-49 A Comparison of High Protein Cottonseed Products, and of Ground and Unground Sorghum Grain LIB.RARYC A. & M. comer OF TEXAS N. B. WILLEY, J. H. JONES and P. J. LYERLY ,7 f) 4,144 195/ The TEXAS AGRICULTURAL AND MECHANICAL COLLEGE SYSTEM [Blank Page in Original Bulletin] Digest Lambs fed ground sorghum grain averaged 2.2 pounds more gain per head in a 93-day feeding period than lambs fed un- ground sorghum grain in experiments conducted during 1947-49 at the El Paso Valley Experiment Station at Ysleta. The feeding 0f the same amount of energy from either 41 percent protein cottonseed cake or 28 percent protein whole pressed cottonseed cake in a ration with alfalfa hay produced lambs of satisfactory finish in 90 to 100-day feeding periods. As much at 2.0 pounds of these concentrates may be fed daily without ill effect. The best daily gain, 0.36 pound per head, was obtained with a ration of ground sorghum grain supplemented with 41 percent protein cottonseed cake and alfalfa hay. CONTENTS Page Digest . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 Review of Literature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 5 Purpose of the Experiment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 Lambs Used . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 6 Feeds Used . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 6 Rations Used . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 7 Methods of Feeding . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 8 Results . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 Ground Compared with Unground Sorghum Grain . . . . . . . . . . . 8 28% Compared with 41% Cake as Supplements . . . . . . . . . . . . . . . . . 9 Cottonseed Cake Compared with Grain and Cake . . . . . . . . . . . . . . . . 10 28% Compared with 41% Cake as the Only Concentrate . . . . . . . .. 11 Summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 Literature Cited . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 15 V53-451-4M-L150 BULLETIN 733 APRIL 1951 LAMB FEEDING TRIALS IN THE EL PASO VALLEY, 1947-49 A Comparison of High Protein Cottonseed Products, and of Ground and Unground Sorghum Grain N. B. Willey, J. H. Jones and P. J. Lyerly* THE EL PASO VALLEY produces large quantities of cotton and alfalfa hay. Little grain is produced in this area; how- ever, the feed by-products of the cotton industry are available for feeding. A feeding system is needed through which [these locally-produced feeds may be marketed to better advantage. Factors which favor the development of a lamb feeding indus- try in this area are a dry climate and moderate Winters, which permit feeding without shelter. Feeder lambs, principally of Rambouillet breeding, are available in the adjacent range areas of Texas and New Mexico. In years of adequate rainfall, many of these feeder lambs are sold for slaughter directly fro-m the range. Lambs which do not fatten are sold as feeders and move to northern feedlots, or to the Great Plains for fattening on wheat pasture. While wheat pasture provides an economical means of fattening lambs, it is not available every year. Ex- tended drouth in either the Great Plains or the Trans-Pecos area disrupts normal movement of these lambs. Alternate outlets for these feeder lambs also are desirable. REVIEW OF LITERATURE Since grain sorghums now grown are principally of the com- bine type (Karper, 1947) with small hard grains, the question is often asked if these newer varieties should be ground for feed- ing lambs. Feeding experiments conducted 20 years ago with larger, softer sorghum grains indicated that grinding was not worth the additional cost when the grain was hand-fed to lambs. It was found by Jones and Dickson (1928) that ground threshed milo was slightly superior to unground threshed milo in two lamb fattening tests, but it was stated that the test should be continued further. Later, Mackey and Jones (1932) observed *Respectively, assistant animal husbandman, El Paso Valley Experiment Station, Ysleta, Texas; professor, Department of Animal Husbandry, Col- lege Station, Texas; and superintendent, El Paso Valley Experiment Station. 6 BULLETIN 733, TEXAS AGRICULTURAL EXPERIMENT STATION that ground threshed milo and Hegari gave no better results than the unground threshed grain. Fraps (1932) stated that cottonseed meal may at times be cheap enough to feed for its energy rather than for its protein content. Cox (1929) found that lambs fed one pounds of cotton- seed meal and alfalfa hay free choice made gains almost equal to those of lambs fed corn, a protein supplement and alfalfa hay. The lambs were able to consume one pound of cottonseed meal daily but failed to clean up 1.25 pounds after having been on feed 65 to 75 days. Jones and Dickson also reported a fair rate of gain but unsatisfactory finish from feeding lambs a ration of cottonseed meal and cottonseed hulls. Neale (1932, 1940) re- ported that 0.8 pound of cottonseed meal per head daily had no ill effect on the health of lambs, but with an increase to 1.25 pounds, the lambs became irregular feeders and had a poor general appearance. PURPOSE OF THE EXPERIMENT The objectives of the feeding trials reported in this bulletin were to determine: (1) the advisability of grinding sorghum grain for fattening lambs; (2) the comparative utility of 41 percent protein cottonseed cake and 28 percent protein whole pressed cottonseed cake as feeds for fattening lambs; and (3) whether lambs can be fattened satisfactorily on these protein supplements when fed with alfalfa hay. PROCEDURE Alfalfa hay, “pea-size” cottonseed cake, whole pressed cotton- seed cake and sorghum grain were used in fattening 876 Ram- bouillet lambs in four fattening tests between October 1947 and April 1949. Lambs Used Rambouillet wether and ewe lambs were used. Three of the test groups were produced under range conditions in Jeff Davis and Brewster counties. The lambs used in the second feeding trial were produced on an irrigated farm in Dona Ana county, New Mexico. Lambs from both sources were healthy, thrifty feeders, Figure 1. In the first trial, the lambs were started on feed in October 1947 and were marketed in January 1948. The second trial was started in February 1948 and was completed in May. The lambs used in the third and fourth trials were purchased in September 1948. The heavier lambs were started on feed in that month and were marketed in December. The lighter lambs were fed alfalfa hay until December, when fat- tening rations were begun, and were marketed in April 1949. Feeds Used Forty-three per cent protein cottonseed meal was used in the LAMB FEEDING TRIALS IN THE EL PASO VALLEY, 1947-49 '4 Figure 1. Typical Rambouillet labs used in these test H first trial of the 1947-48 feeding season. Due to some difficulty in feeding the meal, 41 per cent protein “pea-size” cottonseed cake was used in the other three trials. These feeds and the 28 per cent protein whole pressed cottonseed cake were of prime quality and were processed in El Paso county from cotton grown under irrigation. The sun-cured alfalfa hay was pro- duced on the Ysleta station. It consisted of second, third and fourth cuttings, being coarse but of good green color. The average grade of this hay was U. S. No. 2. Grain was purchased as bulk No. 2 milo and probably consisted of several varieties of combine grain sorghum. The grain was ground through a 3 / 16-inch screen. Rations Used The following rations were used: a Ground sorghum grain, 41 percent protein “pea-size” cottonseed cake and alfalfa hay. Unground sorghum grain, 41 percent protein “pea-size” cottonseed cake and alfalfa hay. h 41 percent protein “pea-size” cottonseed cake and alfalfa ay. Ground sorghum grain, 28 percent protein whole pressed cottonseed cake and alfalfa hay. Unground sorghum grain, 28 percent, protein whole pressed cottonseed cake and alfalfa hay. 28 percent protein whole pressed cottonseed cake and alfalfa hay. These rations were fed in two replications, making a total of 1.2 lots in each test. 8 BULLETIN 733, TEXAS AGRICULTURAL EXPERIMENT STATION In the lots in which 41 percent protein cottonseed cake was used to supplement sorghum grain, the two feeds were mixed in the proportion of 8.5 pounds of grain to 1.5 pounds of cake. With 28 percent protein whole pressed cottonseed cake, the proportion was 8.2 pounds of grain and 1.8 pounds of cake. Concentrates in rations containing 28 percent cake were fed at thle rate of 1.04 times that of rations containing 41 percent ca e. Method of Feeding The lambs were fed in pens approximately 50 by 100 feet in size without access to shelter. After the lambs had cleaned up the concentrates, which were fed each morning and afternoon, alfalfa hay was fed in sufiicient quantities to last until the next feeding. Water and granulated salt were available at all times. Individual weights were taken at the beginning and end of each feeding trial. All lambs in a lot were weighed as a. group (at 28-day intervals. RESULTS Conclusions presented in this bulletin are based on an evalua- tion of feedlot grain, hot carcass weights and grades, feed con- sumed and feed required to produce 100 pounds of gain. Ground Compared with Unground Sorghum Grain Lot I received ground sorghum grain and Lot II unground sorghum grain (Table 1). Table 1. Summary of comparisons using ground and unground sorghum grain in lamb fattening rations Lot number . . . . . . . . . . . I II Group and ration no.1. . 1 and 4 2 and 5 Number of lambs . . . . . . 290 294 Comparison . . . . . . . . . . . Ground sorghum grain Unground sorghum grain Averages in pounds per lamb unless otherwise stated Initial weight . . . . . . . . . . 72.3 72.1 Final weight . . . . . . . . . . . 106.2 - 103.8 Daily gain, basis feed- lot weight . . . . . . . . . 0.365 0.341 Carcass Weight (warm). 50.0 48.8 Yield, percent (basis feed- lot and warm carcass) 47.1 47.0 Carcass grades, percent: Choice . . . . . . . . . . . . . . 60.7 51.4 Good . . . . . . . . . . . . . . . 29.3 35.4 Medium . . . . . . . . . . .. 10.0 13.2 Total feed (consumed): Sorghum grain . . . . . . 94.1 95.0 Protein supplement.. . 17 .2 17 .4 Alfalfa hay . . . . . . . . . . 184.6 181.8 Feed required per cwt. feedlot gain: Sorghum grain... . . . . 277.6 299.7 Protein supplement. . 50. 7 54. 9 Alfalfa hay . . . . . . . . . . 544.5 573. 5 ‘Data for individual groups fed various rations are shown in Table 6. LAMB FEEDING TRIALS IN THE EL PASO VALLEY, 1947-49 9 Lambs fed ground sorghum grain made more gain than those fed unground grain in each of the four trials. The difference 0f 2.2 pounds of feedlot gain was great enough to be statistically significant. Results of this comparison are shown graphically in Figure 2. E GROUND GRAIN III UNGROUND GRAIN .40 I ///////////| I //////////7l .30.. .20.. DAILY GAIN ////////// /7/////////J ///////////I lsl 2nd 3rd 4 TRIAL Figure 2. Average daily feedlot gain in pounds obtained by feeding ground and unground sorghum grain. J> L V. Grinding grain through a 3 /16-inch screen reduced the amount of feed required to produce 100 pounds of gain. The lambs fed ground sorghum grain required 328 pounds of concentrates and 544 pounds of alfalfa hay to produce 100 pounds of gain. The respective requirements for the lambs fed unground sorghum were 355 pounds of concentrates and 5'7 4 pounds of alfalfa hay. Lambs fed ground sorghum grain had a slight advantage in finish, as 60.7 percent of the carcasses graded Choice. Only 51.4 percent of the lambs fed unground sorghum grain graded Choice. Choice. Financial returns favored lambs fed ground grain. A charge of $4.00 per ton was allowed for grinding. 28% Compared with 41% Cake as Supplements The two protein feeds were compared as supplements in a ration containing sorghum grain and alfalfa hay. Lambs fed 10 BULLETIN 733, TEXAS AGRICULTURAL EXPERIMENT STATION Table 2. Summary of comparisons using 41 per cent protein cottonseed cake and 28 per cent protein whole pressed cottonseed cake as supplements in lamb fattening rations c Lot number . . . . . . . . . . . . . . . . . . . . . . . . . . . III IV Group and ration numberl . . . . . . . . . . . . . . 1 and 2 4 and 5 Number of lambs . . . . . . . . . . . . . . . . . . . . . . 294 290 Comparison . . . . . . . . . . . . . . . . . . . . . . . . . . . 41% cake 28% cake Averages in pounds per lamb unless otherwise stated Initial weight . . . . . . . . . . . . . . . . . . . . . . . . . . 2.0 72 .3 Final weight . . . . . . . . . . . . . . . . . . . . . . . . . . 1.05.0 105.0 Daily gain, basis feedlot weight . . . . . . . . . . 0.355 0.352 Carcass weight (warm) . . . . . . . . . . . . . . . . . 49.6 49.1 Yield, percent (basis feedlot and warm carcass) . . . . . . . . . . . . . . . . . . . . . . . . . . . 47. 2 46. 8 Carcass grades, percent: Choice . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 57.1 54.8 Good . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32.0 32.8 Medium . . . . . . . . . . . . . . . . . . . . . . . . . . .. 10.9 12.4 Total feed (consumed): Sorghum grain . . . . . . . . . . . . . . . . . . . . . . . 95.6 93. 5 Protein supplement . . . . . . . . . . . . . . . . . . 14. 9 19. 8 Alfalfa hay . . . . . . . . . . . . . . . . . . . . . . . . .. 182.7 183.7 Feed required per cwt. feedlot gain: Sorghum grain . . . . . . . . . . . . . . . . . . . . . . . 289.7 285.9 Protein supplement . . . . . . . . . . . . . . . . . . . 45.2 60.6 Alfalfa hay . . . . . . . . . . . . . . . . . . . . . . . . . . 553.6 561.8 lData for individual groups fed various rations are shown in Table 6. 41 percent protein cottonseed cake as a supplement, Lot III, had a slight advantage in feedlot gain over those fed 28 percent Whole pressed cottonseed cake, Lot IV (Table 2). During the 93-day feeding period, lambs in Lot III made a total gain of 33.0 pounds per head, as compared with 32.7 pounds made by -lambs in Lot IV. Lambs fed 41 percent protein cake graded higher and pro- duced slightly heavier carcasses. A total of 57.2 percent of these lambs graded Choice, as compared with 54.8 percent of those given 28 percent protein cottonseed cake. Feed was utilized With near equal efficiency in this compari- son. In the lot fed 41 percent protein cake, the lambs were given 335 pounds of concentrates and 554 pounds of alfalfa hay per 100 pounds of weight gained. In the lot receiving 28 percent protein cake, the lambs consumed 346 pounds of con- centrates and 562 pounds of alfalfa hay. Cottonseed Cake Compared with Grain and Cake Lambs fed grain and a protein supplement, Lot V, made prac- tically the same average daily feedlot gain as those receiving cottonseed cake as the only concentrate (Lot VI). LAMB FEEDING TRIALS IN THE EL PASO VALLEY, 1947-49 11 Feed was utilized with approximately the same efliciency by both lots of lambs (Table 3). In the lot fed grain and a protein supplement, the lambs were fed 341 pounds of concentrates and 558 pounds of alfalfa hay for each 100 pounds gain in weight. In the lot fed only cottonseed cake, the lambs consumed 341 pounds of cake and 568 pounds of alfalfa hay. Carcasses of lambs fed grain and cottonseed cake graded slightly higher than those fed only the cake. A total of 56.0 percent of the lambs fed grain and cake graded Choice, as com- pared with 51.0 percent of the lambs fed cottonseed cake as the only concentrate. 28% Compared with 41% Cake as the Only Concentrate A comparison was made of 41 percent protein “pea-size” cottonseed cake, Lot VII, and 28 percent Whole pressed cotton- seed cake, Lot VIII, as the only concentrate (Table 4). An average of 1.06 pounds of 28 percent cake was fed for each 1.0 pound of 41 percent cake. Lambs fed 28 percent cake had a slight advantage, 0.9 pound per head, in feedlot gain, but this difference was not statistically significant. Table 3. Summary of feeding trials comparing cottonseed cake with sorghum grain supplemented with cottonseed cake in lamb fattening rations Lot number . . . . . . . . . . . . . . . . . . . V VI Groups and ration numberl. . . . , 1 , 2 , 4 and 5 3 and 6 Number of lambs . . . . . . . . . . . . . . 584 292 Comparison . . . . . . . . . . . . . . . . . . . Grain supplemented Cottonseed cake with cake Averages in pounds per lamb unless otherwise stated Initial weights . . . . . . . . . . . . . . . . . 72. 2 72.7 Final weight . . . . . . . . . . . . . . . . . . . 105.0 105.4 Daily gain, basis feedlot weight. . 0.353 0.352 Carcass weight (warm) . . . . . . . . . 49.4 49. 5 Yield, percent (basis feedlot and warm carcass) . . . . . . . . . . . . . 47. 0 47.0 Carcass grades, percent: hoice . . . . . . . . . . . . . . . . . . . . .. 56.0 51.0 Good . . . . . . . . . . . . . . . . . . . . . . . 32.4 38.4 Medium . . . . . . . . . . . . . . . . . . .. 11.6 10.6 Total feed (consumed): Sorghum grain . . . . . . . . . . . . . . . 94. 5 Protein supplement . . . . . . . . . . 17. 3 111.6 Alfalfa hay . . . . . . . . . . . . . . . . .. 183.2 185.9 Feed required per cwt. feedlot gain: Sorghum grain . . . . . . . . . . . . . . . 288.1 Protein supplement . . . . . . . . . . 52. 7 341.3 Alfalfa hay . . . . . . . . . . . . . . . . . . 558.5 568.5 lData for individual groups fed various rations are shown in Table 6. 12 BULLETIN 733, TEXAS AGRICULTURAL EXPERIMENT STATION Table 4. Summary of feeding trials comparing two types of cottonseed cake as concentrates in lamb fattening rations Lot number . . . . . . . . . . . . . . . . . . . . . . . . . . . VII VIII Group and ration numberl . . . . . . . . . . . . . . 3 6 Number of lambs . . . . . . . . . . . . . . . . . . . . . . 146 146 Comparison . . . . . . . . . . . . . . . . . . . . . . . . . . . 41% cake 28% cake Averages in pounds per lamb unless otherwise stated Initial weight . . . . . . . . . . . . . . . . . . . . . . . . . . 72.3 73.1 Final weight . . . . . . . . . . . . . . . . . . . . . . . . . . . 104.6 106.3 Daily gain, basis feedlot weight . . . . . . . . . . 0.347 0.357 Carcass weights (warm) . . . . . . . . . . . . . . . . . 49.7 49.3 Yield, percent (basis feedlot and warm car- cass) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47.5 46.4 Carcass grades, percent: Choice . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52.7 49.3 Good . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36.3 40.4 Medium . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11.0 10.3 Total feed (consumed): Protein supplement . . . . . . . . . . . . . . . . . . 108.1 115.1 Alfalfa hay . . . . . . . . . . . . . . . . . . . . . . . . . . 185.6 186.2 Feed required per cwt. feedlot gain: Protein supplement . . . . . . . . . . . . . . . . . . 334. 7 346. 7 Alfalfa hay . . . . . . . . . . . . . . . . . . . . . . . . . . 574. 6 560. 8 lData for individual groups fed various rations are shown in Table 6. Carcasses from lambs fed 41 percent cake were heavier and graded higher than those from lambs fed 28 percent cake. A total of 52.7 percent of the lambs from Lot VII graded Choice, while only 49.3 percent from Lot VIII reached this grade. In the lot fed 41 percent protein, the lambs were given 335 pounds of cake and 575 pounds of alfalfa hay per 100 pounds of Weight gained. The lambs fed 28 percent protein consumed 347 pounds of cake and 561 pounds of alfalfa hay to put on the same Weight. There were no digestive disturbances in the lambs receiving either the 41 or the 28 percent cake. During the last 43 days of the fourth feeding trial, one group of lambs consumed an average of 1.99 pounds of 41 percent protein cake daily and another group 2.16 pounds of 28 percent cake. Only one lamb wast lotst out of the 293 fed protein supplement as the only con- cen ra e. Table 5 summarizes the average rations consumed and the average daily gains in pounds for approximate 28-day feeding periods. A summary of the four feeding trials, based on Weighted averages, is shown in Table 6. This table includes initial and final feedlot Weights, hot carcass Weights and carcass grades and amounts of feed consumed per lamb. A financial statement LAMB FEEDING TRIALS IN THE EL PASO VALLEY, 1947-49 13 is included to show prevailing costs of feed, lambs, sale prices and return from feeding. Table 5. Average rations consumed and gains in pounds by periods of four lamb fattening trials, 1947-49 1-28 days 28—56 days 56-93 days Average Ration 1. Ground sorghum grain, 41% protein cottonseed cake and alfalfa hay .50 1 01 1. Grain . . . . . . . . . . . . . . 1.02 Cottonseed cake. . . . . .08 .16 .22 .16 Alfalfa hay . . . . . . . . .. 2.30 2.06 1.63 1.96 Daily gain . . . . . . . . A .29 .37 .42 .37 Ration 2. Unground sorghum grain, 41 % protein cottonseed cake and alfalfa hay Grain . . . . . . . . . . . . .. .50 1.01 1.45 1.03 Cottonseed cake. . . . . .08 .16 .22 .16 Alfalfa hay . . . . . . . . .. 2.31 2.07 1.63 1.97 Daily gain . . . . . . . . .30 .33 .38 .34 Ration 3. 41% protein cottonseed cake and alfalfa hay Cottonseed cake. . . . . .58 1.18 1.59 1.16 Alfalfa hay . . . . . . . . .. 2.36 2.06 1.67 2.00 Daily gain . . . . . . . . .32 .36 .36 .35 Ration 4. Ground sorghum grain, 28% protein whole pressed cottonseed cake and alfalfa hay Grain . . . . . . . . . . . . . .. .51 1.01 1.36 1.00 Cottonseed cake. . . . . .11 .22 .28 .21 Alfalfa hay . . . . . . . . . . 2.38 2.06 ’ 1.69 2.01 Daily gain . . . . . . . . .33 .33 .41 .36 Ration 5. Unground sorghum grain, 28% protein whole pressed cottonseed cake and alfalfa hay Grain . . . . . . . . . . . . . .. .50 1.01 1.40 1.01 Cottonseed cake. . . . . .11 .22 .29 .21 Alfalfa hay . . . . . . . . . . 2.28 2.03 1. 62 1. 94 Daily gain . . . . . . . . .31 .30 .40 .34 Ration 6. 28% protein whole pressed cottonseed cake and alfalfa hay Cottonseed cake. . . . . .61 1.24 1.71 1.24 Alfalfa hay . . . . . . . . .. 2.32 2.11 1.68 2.00 Daily gain . . . . . . . . .34 .34 .38 .36 14 BULLETIN 733, TEXAS AGRICULTURAL EXPERIMENT STATION dmwww >3 mbwrm was "345 dxmu wwwwcofiou wwmwmZQ 2on3 swmwopQ wwwm Momwww dxwo wwwwqofioo Q1395 $3“ x565 .52» EBQMQOw wssohwc: “ooévw éfifiw EQAMQOm @555 Ho» 5Q mmuiQ wwwhw dspsofi 95% M526 v3 3E2 Q2 Qmu Qoo? mm»: mpswmo>P_ 8 mw. mm. mo. ww. mw. . . . . . . . . . . . . . . . . . . . . . . . . . . ..c.=.59~ $2 ca? fir? mwww S 6w S? 3mm . . . . . . . . . . . . . 53v 3Q Eég i». wwzwowm mwww mmww wfimw fiimw mwww voww . . . . . . . . . . . . . . . . . . . . . . . . . . . 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Information was obtained 0n (1) the value 0f grinding combine sorghum grain, and on (2) the utility of 41 percent protein cottonseed cake and 28 percent protein Whole pressed cottonseed cake as supplements and as the only concentrate in lamb fattening rations. Grinding sorghum grain increased feedlot gain 2.2 pounds per lamb during four feeding periods averaging 93 days. This dif- ference in gain was great enough to be statistically significant. Grinding grain reduced the amount of feed required to produce 100 pounds of gain. The lambs fed ground grain carried more finish and had a higher slaughter grade than those fed un- ground grain. A comparison was made of the two protein feeds as supple- ments for sorghum grain and alfalfa hay. Lambs fed 41 per- cent cottonseed cake made more feedlot gain, their carcasses were heavier and graded higher than those fed the 28 percent protein cake. Cottonseed cake was compared with sorghum grain supple- mented with cottonseed cake as a concentrate for lamb fatten- ing. Lambs in both lots made practically the same rate of gain and utilized feed with equal efliciency. Carcasses from the lambs fed grain and a supplement graded higher than those receiving cake as the only concentrate. The 41 percent protein cottonseed cake and 28 percent protein whole pressed cottonseed cake were compared as con- centrates in a ration with alfalfa hay for fattening lambs. An average of 1.06 pounds of 28 percent protein cake Was fed for each 1.0 pound of 41 percent protein cake. Differences in rate of gain, feed required to produce 100 pounds of gain and carcass grades were not significant. LITERATURE CITED Cox, Rufus F., 1929. Cottonseed Meal with Various Roughages as Fattening Rations for Lambs. New Mex. Agri. Exp. Sta. Bul. 179. Fraps, G. S., 1932. The Composition and Utilization of Texas Feeding Stuffs. Tex. Agr. Exp. Sta. Bul. 461. Jones, M., and R. E. Dickson, l928. Grain Sorghum vs. Corn for Fattening Lambs. Tex. Agr. Exp. Sta. Bul. 379. Karper, R. E., 1947. New Varieties of Sorghum. Tex. Agr. Exp. Sta. Prog. Report 1064. Mackey, A. K. and l. M. Jones, 1932. Fattening Lambs on Corn, Milo, Hegari, Wheat and Oats with Cottonseed Cake and Al- falfa. Tex. Agr. Exp. Sta. Bul. 465. Neale, P. E., 1932. The Use of Cottonseed Meal, Cottonseed Hulls and Molasses in Fattening Rations for New Mexico Range Lambs. New Mex. Agr. Exp. Sta. Bul. 200. Neale, P. E., 1940. Cottonseed Meal, Hegari and Alfalfa Hay for Fattening of Lambs. New Mex. Agr. Exp. Sta. Bul. 2'72.