Effect of Dietary Protein Sources on Lamb’s Performance: A Review


1 University of Agriculture, Toba Tek Singh Campus, Faisalabad, Pakistan

2 Institute of Animal Nutrition and Feed Technology, UAF, Pakistan

3 University of Arid Agriculture, Rawalpindi, Pakistan


Protein and energy are the two major components of feed that influence performance of the growing and fattening lambs. Provision of the quality of protein in the lamb’s diet does not only improve the animal performance but also ensures profitable animal production. Different vegetable protein sources are used to formulate the rations for growing and fattening lambs. These protein sources differ in amino acid profiles which results in varied responses of the animals. Protein source with a higher by-pass value have been reported to have more intense effects on N-balance, growth and muscle mass accretion than those which are lower in by-pass protein. Inclusion of protein sources with amino acid profiles matching closely to the amino acid needs of the growing lambs results in better growth performance and nitrogen utilization by the animal. Glucogenic amino acids present in some protein sources also improve the energy status of the animal by increasing gluconeogenesis. Presence of anti-nutritional factors may limit the inclusion of protein sources in the diet. Higher fiber contents like in sunflower meal adversely affect the animal performance by decreasing intake and digestibility. Canola meal has higher S contents that are available to the microbes at ruminal level to produce S containing amino acids. Furthermore, ruminal degradability of protein that is synchronized with carbohydrate digestion also results in better feed utilization and animal performance. So, a good protein source, regardless of its escape protein value, should have better amino acid and micronutrient profiles with safe levels of anti-nutritional factors.


Abdullah A.Y. and Awawdeh F.T. (2004). The effect of protein source and formaldehyde treatment on growth and carcass composition of Awassi lambs. Asian-Aust. J. Anim. Sci. 17(8), 1080-1087.
Abou-Donia M.B. (1989). Gossypol. In: Toxicants of Plant Origin. P.R. Cheeke Ed., Vol. IV: Phenolics: 122. CRC Press, Boca.
Agbossamey Y. (1995). Effects of supplementation of hay silage with oil cake of canola or fish meal on the value of basal ration of lambs. Memory of Workmanship, Universite laval, Quebec, Canada.
AndersonJ.O. and Warnick R.E. (1966). Sequence in which essential amino acids become limiting for growth of chicks fed rations containing cottonseed meal. Poult. Sci. 45, 84-89.
Arthington J.D. and Kalmbacher R.S. (2003). Effect of early weaning on the performance of three-year-old, first-calf beef heifers and calves reared in the subtropics. J. Anim. Sci. 81, 1136-1141.
Atti N., Rouissi H. and Mahouachi M. (2004). The effect of dietary crude protein level on growth, carcass, and meat composition of male goat kids in Tunisia. Small Rumin. Res. 54, 89-97.
Baile C.A.and Forbes J.M. (1974). Control of feed intake and regulation of energy balance in ruminants. Physiol. Rev. 54, 160.
Bailey B.W. and Sims P.L. (1998). Comparison of eastern gamagrass and cotton seed meal as supplements for sheep fed mature eastern gama grass hay. Anim. Feed Sci. Technol. 76, 95-102.
Bandyk C.A., Cochran R.C., Wickersham T.A., Titgemeyer E.C., Farmer C.G. and Higgins J.J. (2001). Effect of ruminal vs. postruminal administration of degradable protein on utilization of low-quality forage by beef steers. J. Anim. Sci. 79, 225-231.
Baranowski A., Gabryszuk M., Jozwik A., Bernatowicz E. and Chylinski W. (2007). Fattening performance, slaughter indicators and meat chemical composition in lambs fed the diet supplemented with linseed and mineral bioplex. Anim. Sci. Papers and Rep. 25(1), 35-44.
Bateman H.G., Clark J.H. and Murphy M.R. (2005). Development of a system topredict feed protein flow to the small intestine of cattle. J. Dairy Sci. 88, 282-295.
Bernard J.K., Delost R.C., Mueller F.J., Miller J.K. and Miller W.M. (1991). Effect of wet or dry corn gluten feed on nutrient digestibility and milk yield and composition. J. Dairy Sci. 74, 3913-3919.
Bowman J.G.P. and PatersonJ.A. (1988). Evaluation of corn gluten feed in high energy diets for sheep and cattle. J. Anim. Sci. 66, 2057-2070.
Braman W.L., Hatfeild E.E., Owens F.N. and Lewis J.M. (1973). Protein concentration and sources for finishing ruminants fed high concentrate diets. J. Anim. Sci. 36, 782-787.
Brand T.S., MerweG.D. and Young D. (2001). Full-fat canola as protein source in diets for finishing lambs. Small Rumin. Res. 41, 235-238.
Brandt R.T. and Klopfenstein T.J. (1986). Evaluation of alfalfa corn cob associative action. I. Interactions between alfalfa hay and ruminal escape protein on growth of lambs and steers. J. Anim. Sci. 63, 894-901.
Briggs H.M. and Heller V.G. (1942). The effect of adding large amounts of cotton seed meal to a lamb fattening ration. J. Anim. Sci. 1, 277-284.
Brown W.F. and Johnson D.D. (1991). Effects of energy and protein supplementation of ammoniated tropical grass hay on the growth and carcass characteristics of cull cows. J. Anim. Sci. 69, 348-357.
Bruno R.G.S., Rutigliano H.M., Cerri R.L., Robinson P.H. and Santos J.E.P. (2009). Effect of feeding Saccharomyces Cerevisiae on performance of dairy cows during summer heat stress. Anim. Feed Sci. Technol. 150, 175-186.
ButlerW.R. (1998). Review: Effect of protein nutrition on ovarian and uterine physiology in dairy cattle. J. Dairy Sci. 81, 2533-2539.
Butterfield R.M. (1988). New Concepts of Sheep Growth. Deptt. of Vet. Anatomy, Univ. of Sydney, Australia.
Carneiro A., Esquivel A., Hogue D.E. and Thonney M.L. (2006). Effect of fermentable fiber and protein source on feed intake and efficiency of growing lamb.Conference on Asia Agriculture and Animal. 13, 1-6.
Carro M.D., Ranilla M.J., Giraldez F.J. and Mantecon A.R. (2006). Effects of malate on diet digestibility, microbial protein synthesis, plasma metaboloites, and performance of growing lambs fed a high concentrate diet. J. Anim. Sci. 84, 405-410.
Caton J.S., Hoefler W.C., Galyean M.L. and Funk M.A. (1988). Influence of cottonseed meal supplementation and cecal antibiotic infusion in lambs fed low quality forage. Intake, digestibility, nitrogen balance and ruminal and cecal digesta kinetics. J. Anim. Sci. 66, 2245-2252.
Chakeredza S. (2003). Growth performance of weaner lambs offered maize stover supplemented with varying levels of maize and cotton seed meals. Livest. Prod. Sci. 73, 35-44.
Chalupa W. (1975). Rumen bypass and protection of proteins and amino acids. J. Dairy Sci. 68, 1198-1218.
Chase J.R., Bastidas C.C.J., Ruttle L., Long C.R. and Randel R.D. (1994). Growth and reproductive development in Brah-man bulls fed diet containing gossypol. J. Anim. Sci. 72, 445-452.
Coombe J.B. (1985). Rape and Sunflower seed meals as supplement for sheep fed on oat straw. Aust. J. Agric. Res. 36, 717-728.
Dabiri N. and Thonney M.L. (2004). Source and level of supplemental protein for growing lambs. J. Anim. Sci. 86, E287-E292.
Danke R.J., Sherrod L.B., Nelson E.C. and Tixman A.C. (1966). Effect of autoclaving and steaming of cotton seed meal for different lengths of time on nitrogen solubility and retention in sheep. J. Anim. Sci. 25, 181-184.
Davies H.L., Robinson T.F., Roeder B.L., Sharp M.E., Johnston N.P., Christensen A.C. and Schaalje G.B. (2007). Digestibility, nitrogen balance, and blood metabolites in L. lama (Lama glama) and alpaca (lama pacos) fed barley or barley alfalfa diets. Small Rumin. Res. 73, 1-7.
Diaz M.T., Velasco S., Caneque V., Lauzurica S., Ruiz de Huidobr F., Perez C., Gonzalez J. and Manzanares C. (2002). Use of concentrate or pasture for fattening lambs and its effect on carcass and meat quality. Meat. Sci. 43, 257-268.
Drackley J.K., Clark A.K., Sahlu T. and Schingoethe D.J. (1985). Evaluation of sunflower crop residue in rations for growing Holsteinheifers.J. Dairy Sci. 68, 2390-2395.
Erasmus L.J. and Botha P.M. (1994). Effect of protein source on ruminal fermentation and passage of amino acid to the small intestine of lactating cows. J. Dairy Sci. 77, 3655-3665.
Erasmus L.J., Botha P.M. and Kistner A. (1992). Effect of yeast culture supplement on production, rumen fermentation and duodenal nitrogen flow in dairy cows. J. Dairy Sci. 75, 3056-3065.
Erickson O.D., Hankel M., Light R.M., Limesand W. and Faller T. (1980). Sunflower meal vs. soybean oil meal for feeder lambs. J. Anim. Sci. 51, 96-97.
Fahmy M.H., Boucher J.M., Poste L.M., Gregoire R., Butler G.and Cpmeau J.E. (1992). Feed efficiency, carcass characteristics, and sensory quality of lambs with or without prolific ancestry, fed diets with different protein supplements. J. Anim. Sci. 70, 1365-1374.
Fielding D. and Kyomo M.L. (1979). Sunflower or cottonseed meal as supplement for steers on molasses/urea based diets. Trop. Anim. Prod. 4(3), 263-267.
Firkins J.L., Berger L.L., Fahey G.C. and Merchen N.R. (1984). Ruminal nitrogen degradability and escape of wet and dry distillers grains and wet and dry corn gluten feeds. J. Dairy Sci. 67, 1936-1944.
Gamboa D.A., Calhoun M.C., Kuhlmann S.W., Haq A.U. and Bailey C.A. (2001). Tissue distribution of gossypol enantiomers in broilers fed various cottonseed meals. Poult. Sci. 80, 920-925.
Gleghorn J.F., ElamN.A., Galyean M.L., Duff G.C., Cole N.A. and Rivera J.D. (2004). Effects of crude protein concentration and degradability on performance, carcass characteristics, and serum urea nitrogen concentrations in finishing beef steers. J. Anim. Sci. 82, 2705-2717.
Hall M.B. and HuntingtonG.B. (2008). Nutrient synchrony: Sound in theory, elusive in practice. J. Anim. Sci. 82, 3237-3244.
Hango A., Mtenga L.A., Kifaro G.C., Safari J., Mushli D.E. and Muhikambele V.R.M. (2007). A study on growth performance and carcass characteristics of small east African goats under different feeding regimes. Livestock Research for RuralCDevelopment.19 (9).
Hogg B.W., Mercer G.J. and Mortimer B.J. (1992). Carcass and meat quality attributes of commercial goats in New Zealand. Small Rumin. Res. 8, 243-256.
Hussein H.S. and JordanR.M. (1991). Fish meal as a protein supplement in ruminant diets: A review. J. Anim. Sci. 69, 2115-2122.
Irshaid R.H., Harp M.Y. and Titi H.H. (2003). Replacing soybean meal with sunflower seed meal in the ration of Awassi ewes and lambs. Small Rumin. Res. 50, 109-116.
Ivan M., Mir P.S., Mir Z., Entz T., He M.L. and McAllister T.A. (2004). Effects of dietary sunflower seeds on rumen protozoa and growth of lambs. British J. Nutr. 92(2), 303-310.
Janssen W.M.M.A., Terpstra K., Beeking F.F.E. and Bisalsky A.J.N. (1979). Feeding Values for Poultry. 2nd Ed. Spelderholt Institute for Poultry Research, Netherlands.
Jaster E.H., Staples C.R., Mc Coy G.C. and Davis L. (1984). Evaluation of wet corn gluten feed, oattage, sorghum-soybean silage and alfalfa haylage for dairy heifers. J. Dairy Sci. 67, 1976-1982.
Jørgensen H., Sauer W.C. and Thacker P.A. (1984). Amino acid availabilities in soybean meal, sunflower meal, fish meal and meat and bone meal fed to growing pigs. J. Anim. Sci. 58, 926-934.
Kabir F., Sultana M.S., Shahjala M., Khan M.J. and Alam M.Z. (2004). Effect of protein supplementation on growth performance in female goats and sheep under grazing condition. Pak. J. Nutr. 3, 237-239.
Kandylis K., Nikokyris P.N. and Deligiannis K. (1999). Performance of growing fattening lambs fed diets containing different proportions of cottonseed meal. J. Sci. Food. Agric. 79(12), 1-4.
Karsli M.A., Tasal T. and Nursoy H. (2006). Effect of dietary inclusion of hazelnut and soybean meals on microbial protein synthesis. Small Rumin. Res. 64, 180-185.
Keery C.M., Amos H.E. and Froetschel M.A. (1993). Effects of supplemental protein source on intraruminal fermentation, protein degradation and amino acid absorption. J. Dairy Sci. 76, 514-524.
Khalid M.F., Sarwar M., Mahr U.N. and Zia U.R. (2011). Response of growing lambs fed on different vegetable protein sources with or without probiotics. Int. J. Agric. Biol. 13, 332-338.
Khan A.G., Azim A., Nadeem M.A. and Khan M.A. (1997). Effect of growing fattening diets on the growth performance of intensified Afghani lambs. Small Rumin. Res. 25(1), 39-42.
Knowlton K.F., Herbein J.H., Meister-Weisbarth M.A. and Wark W.A. (2001). Nitrogen and phosphorus partitioning in lactating Holsteincows fed different sources of dietary protein and phosphorus. J. Dairy Sci. 84, 1210-1217.
Krysl L.J., Branine M.E., Galyean M.L., Estell R.E. and Hoefler W.C. (1987). Influence of cotton seed meal supplementation on voluntary intake, ruminal and cecal fermentation, digesta kinetics and serum insulin and growth hormone in mature ewes fed Prairie hay. J. Anim. Sci. 64, 1178-1188.
Lee Y.B., Harris D.E., FergusonB.D. and Jelbart R.A. (1990). Growth and carcass fatness of ewe, weather, ram and weaning age. Aust. J. Exp. Agric. 30, 743-747.
Leupp J.L., Lardy G.P., Soto-NavarroS.A., Bauer M.L. and Caton J.S. (2006). Effects of canola seed supplementation on intake, digestion, duodenal protein supply, and microbial efficiency in steers fed forage-based diets. J. Anim. Sci. 84, 499-507.
Lupton C.J., Huston J.E., Craddock B.F., Pfeiffer F.A. and Polk W.L. (2007). Comparison of three systems for concurrent production of lamb meat and wool. Small Rumin. Res. 72, 133-140.
Lupton C.J., Huston J.E., Hruska J.W., Craddock B.F. and Pfeiffer F.A. (2008). Comparison of three systems for concurrent production of high quality mohair and meat from angora male kids. Small Rumin. Res. 74, 64-71.
Mahgoub O., Khan A.J., Al-Maqbaly R.S., Al-Sabahi J.N., Annamali K. and Al-Sakry K. (1978). Fatty acid composition of muscle and fat issues on Omani Jebel Akhdar goats of different sexes and weights. Meat Sci. 61, 381-387.
Mandell I.B., Buchanan-Smith J.G., Holub B.J. and CampbellC.P. (1997). Effects of fish meal in beef cattle diets on growth performance, carcass characteristics, and fatty acid composition of Longissimus muscle. J. Anim. Sci. 75, 910-919.
Master D.G., Mata G., Liu S.M. and Schlink A.C. (2002). Frequency of feeding lupin and canola meal supplements to young sheep influences wool growth and mitotic rate but not staple strength. Aust. J. Exp. Agric. 42, 103-109.
Matras J., Bartle S.J. and PrestonR.L. (1991). Nitrogen utilization in growing lambs: effect of grain (starch) and protein sources with various rates of ruminal degradation. J. Anim. Sci. 69, 339-347.
McClure K.E., Van Keuren R.W. and Althouse P.G. (1994). Performance and carcass characteristics of weaned lambs either grazed on orchardgrass, ryegrass, or alfalfa or fed all-concentrate diets in drylot. J. Anim. Sci. 72, 3230-3237.
Merchen N.R., Darden D.E., Berger L.L., Fehay G.C., Titgemeyer E.C. and Fernando R.L. (1987). Effects of dietry energy levels and supplemental protein source on performance of growing steers and nutrient digestibility and nitrogen balance in lambs. J. Anim. Sci. 65, 658-668.
Milis C.H., Limadis D., Karalazos A. and Dotas D. (2005). Effects of main protein, non-forage fiber and forage source on digestibility, N balance and energy value of sheep rations. Small Rumin. Res. 59, 65-73.
Murphy T.A., Loerch S.C., McClure K.E. and Solomon M.B. (1994). Effects of restricted feeding in growth and carcass composition of lambs. J. Anim. Sci. 72, 3131-3137.
Nagalakshmi D., Sastry V.R.B. and Kesava R.V. (2002). Influence of feeding processed cotton seed meal on meat and wool production of lambs. Asian-Aust. J. Anim. Sci. 15, 26-33.
Negesse T., Rodehutscord M. and Pfeffer E. (2001). The effect of dietary crude protein level on intake, growth, protein retention and utilization of growing male Saanen kids. Small Rumin. Res. 39, 243-2251.
Nelson A.B. and Watkins W.E. (1967). Influence of interval of feeding cotton seed meal to sheep on ration digestibility, nitrogen balance and blood constituents. J. Anim. Sci. 26, 1175-1178.
NRC. (1985). Nutrient Requirements of Sheep. 6th Rev. Ed., NationalAcademy Press Washington, D.C.
Nsahlai I.V., Green H., Bradford M. and Bonsi M.L.K. (2002). The influence of source and levels of protein, and implantation with zeranol on sheep growth. Livest. Prod. Sci. 74(1), 103-112.
PatersonJ.A., Anderson B.M., Bowman D.K., Morrison R.L. and Williams J.E. (1983). Effect of protein sources and lasalocid on nitrogen digestibility and growth by ruminants. J. Anim. Sci. 57, 1537-1544.
Peter A.P., Hatfield E.E., Owens F.N. and Garrigus U.S.(1971). Effects of aldehyde treatment of soybean meal on in vitro ammonia release, solubility and lamb performance. J. Nutr. 101, 605-612.
Phillips W.A. and RaoS.C.(2001). Digestibility and nitrogen balance of diets containing cottonseed meal, alfalfa, or pigeon pea as the protein source. Livestock Research for RuralCDevelopment.13(6).
Phillips W.A., Horn G.W. and SmithM.E.(1995). Effect of protein supplementation on forage intake and nitrogen balance of lambs fed freshly harvested wheat forage. J. Anim. Sci. 73, 2687-2693.
Plaisance R., Petit H.V., Seoance J.R. and Rioux R. (1997). The nutritive value of canola, heat treated canola and fish meals as protein supplements for lambs fed grass silage. Anim. Feed Sci. Technol. 68, 139-152.
Ponnampalam E.N., Egan A.R., Sinclair A.J. and Leury B.J. (2005). Feed intake, growth, plasma glucose and urea nitrogen concentration, and carcass traits of lambs fed isoenergetic amounts of canola meal, soybean meal, and fish meal with forage based diet. Small Rumin. Res. 58, 245-252.
PrestonR.L., Schuakenberg D.D. and Pflanda W.H. (1965). Protein utilization in ruminants. I. Blood urea nitrogen as affected by protein intake. J. Nutr. 86, 281-290.
RichardsonR.C., Beville N.R., Ratcliff K.R. and Albin C.R. (1981). Sunflower meal as a protein supplement for growing ruminants. J. Anim. Sci. 53, 557.
Rizzi L., Simioli M., Sardi L. and Monetti P.G. (2002). Carcass quality, meat chemical and fatty acid composition of lambs fed diets containing extruded soybean and sunflower seeds. Anim. Feed Sci. Technol. 97, 103-114.
RuleD.C., Busboom J.R. and Kercher C.G. (1994). Effect of dietary canola on fatty acid composition of bovine adipose tissue, muscle, kidney and liver. J. Anim. Sci. 72, 2735-2744.
Rusche W.C., Cochran R.C., Corah L.R., Stevenson J.S., Harmon D.L., Brandt R.T. and Minton J.E. (1993). Influence of source and amount of dietary protein on performance, blood metabolites, and reproductive function of primiparous beef cows. J. Anim. Sci. 71, 557-563.
Sainz R.D., Hosking B.J., Hart F.J. and Spencer G.S.G. (1994). Effect of growth hormone releasing factors and cottonseed meal on hormone and metabolites in plasma from lambs fed Lucernechaff ad libtum. Aust. J. Agric. Res. 45(6), 1125-1135.
Sano H., Sawada H., Takenami A., Oda S. and Al-Mamun M. (2007). Effect of dietary energy intake and cold exposure on kinetics of plasma glucose metabolism in sheep J. Anim. Physiol. Nutr. 91, 1-5.
Santos-Silva J., Bessa R.J.B. and Mendes I.A. (2003). The effect of supplementation with expanded sunflower seed on carcass and meat quality of lambs raised on pasture. J. Meat Sci. 65(4), 1301-1308.
Sarwar M., Khan M.A. and Iqbal Z. (2002). Feed resources for livestock in Pakistan. Int. J. Agric. Biol. 4, 186-192.
Seoane J.R., Amyot A., Christen A.M. and Pettit H.V. (1993). Performance of growing steers fed either hay or silage supplemented with canola or fish meal. Can.J. Anim. Sci. 73, 57-65.
Sniffen C.J. and Robinson P.H. (1987). Symposium: Protein and fiber digestion, passage and utilization in lactating cows. J. Dairy Sci. 70, 425-441.
Solomon M., Melaku S. and Tolera A. (2008). Supplementation of cottonseed meal on feed intake, digestibility, live weight and carcass parameters of Sidama goats. Livest. Sci. 119(1), 137-144.
Staples C.R., DavisC.L., McCoy G.C. and Clark J.H. (1983). Feeding value of wet corn gluten feed for lactating cows. J. Diary Sci. 66(1), 1.
Stern M.D., Rode M.L., Prange R.W., Staufacher R.H. and Satter L.D. (1983). Ruminal protein degradation of corn gluten meal in lactating dairy cattle fitted with duodenal t-type cannulae. J. Anim. Sci. 56, 194-205.
Suliman G.M. and Babiker S.A.(2007). Effect of diet protein source on lamb fattening. Res. J. Agric. Biol. Sci. 3, 403-408.
Swanson K.C., Caton J.S., Redmer D.A., Burke V.I. and Reynolds L.P. (2000). Influence of undegraded intake protein on intake, digestion, serum hormones and metabolites and nitrogen balance in sheep. Small Rumin. Res. 35(3), 225-233.
Tanksley T.D., Knabe D.A., Purser K., Zebrowska T. and Corley J.R. (1981). Apparent digestibility of amino acids and nitrogen in three cotton seed meals and soybean meal. J. Anim. Sci. 52, 769-777.
Thonney M.L. and Hogue D.E. (1986). Fish meal or cottonseed meal as supplemental protein for growing Holsteinsteers. J. Dairy Sci. 69, 1648-1651.
Titi H.H. (2003). Replacing soybean meal with sunflower meal with or without fibrolytic enzymes in fattening diets of goat kids. Small Rumin. Res. 48, 45-50.
Todaro M., Corrao A., Barone C.M.A., Alicata M.L., Schinelli R. and Giaccone P. (2006). Use of weaning concentrate in the feeding of suckling kids: Effects on meat quality. Small Rumin. Res. 66, 44-50.
Tomilnson A.P., Powers W.J., Horn H.H.V., Nordstdet R.A. and Wilcox C.J. (1996). Dietary protein effects on nitrogen excretion and manure characteristics of lactating cows. Trans ASAE. 39, 1441-1448.
Urbaniak M. (1995). Effects of blood meal, fish meal, soybean meal or casein on growth and body composition in lambs. Small Rumin. Res. 18(3), 213-217.
Villamide M.J. and San Juan L.D. (1998). Effect of chemical composition of sunflower seed meal on its true metabolizable energy and amino acid digestibility. Poult. Sci. 77, 1884-1892.
WallerJ., Klopfenstein T. and Poos M. (1980). Distillers feeds as protein sources for growing ruminants. J. Anim. Sci. 51, 1134-1167.
Walz L.S., White T.W., Fernandez J.M., Gentry L.R., Blouin D.C., Freotschel M.A., Brown T.F., Lupton C.J. and Chapa A.M. (1998). Effect of fish meal and sodium bentonite on daily gain, wool growth, carcass characteristics and ruminal and blood characteristics of lamb fed concentrate diets. J. Anim. Sci. 76, 2025-2031.
Ward A., Tawila G.A., Sawsan M.A., Gad M. and El-Muniary M.M. (2008). Improving the nutritive value of cottonseed meal by adding iron on growing lambs diets. World J. Agric. Sci. 4(5), 533-537.
Weisbjerg M.R., Borsting C.F. and Hvelplund T. (1992). The influence of tallow on rumen metabolism, microbial biomass synthesis and fatty acid composition of bacteria and protozoa. Acta. Agric. Scan. Section A-Animal Science. 42, 138-147.
WieseS.C., White C.L., Masters D.G., Milton J.T.B. and Davidson R.H. (2003). Growth and carcass characteristics of prime lambs fed diets containing urea, lupins or canola meal as a crude protein source. Aust. J. Exp. Agric. 43(10), 1193-1197.
Williams P.E.V., Triat C.A.G., Innes G.M. and Newbold C.J. (1991). Effects of the inclusion of yeast culture (Saccharomyces cerevisiaeplus growth medium) in the diets of cows on milk yield and forage degradation and fermentation patterns in the rumen of sheep and steers. J. Anim. Sci. 69, 3016-3026.
Woods W.R., RichardsonH., Kruse K., Gallup W.D. and Tillman A.D. (1962). Further studies on the nutritive value of cotton seed meal for ruminants. J. Anim. Sci. 21, 284-289.
Yagoub M. and Talha E.E.A. (2009). Effect of replacement of groundnut cake with decorticated sunflower cake on the performance of Sudanese desert lambs. Pak. J. Nutr. 8(1), 46-48.
Zinn R.A. (1993). Characteristics of ruminal and total tract digestion of canola meal and soybean meal in a high energy diet for feedlot cattle. J. Anim. Sci. 71, 796-801.
  • Receive Date: 28 May 2011
  • Revise Date: 22 August 2011
  • Accept Date: 22 August 2011
  • First Publish Date: 01 June 2012