饲料分类英文课件Chapter 6 Energy feeds

1、Chapter 6 High-Energy Feeds（能量饲料）1Introduction Definition of high-energy feeds - High-energy feeds are feeds used primarily for their energy content. - Contain less than 20% protein and 18%CF. - Many protein supplements can also be classified as high-energy feeds.2IntroductionClassificationCereal gr

2、ains Grain milling and milling by-productsFats and oilsMolassesRoots and tubers36.1 Cereal grains SourceGrains are seeds from cereal plants.Corns, oats, barley and sorghums are the primary grains, which are known as feed grains(饲料谷物).46.1 Cereal grains Functions They are widely used as sources of en

3、ergy in animal feeding.They also provide substantial portions of protein. The energy comes from their starch content, the protein and EE together supplying about 1/3 as much energy as the starch. 53. Structure of GrainFig. 6-1 structure of Grain（胚乳）(糊粉层）6Aleurone(糊粉层）The aleurone surrounds the starc

4、hy endosperm of grain.The cells of the aleurone are thick-walled and rich in oil, niacin（烟酸）, and mineral.Phytic acid（植酸） is also produced in rather large quantities in this region.3. Structure of Grain73. Structure of GrainStarchy endosperm（淀粉胚乳）Endosperm contains most of the starch and cells fill

5、with starch granules.Starch granules(淀粉粒） are enveloped in a protein matrix which impedes digestion of starch and the digestion of starch can increase if granule are broken open.About 60% of the entire wheat grain and 70% of its endosperm are starch.8 Germ（胚）Wheat and corn germ have a rather large l

6、ipid fraction, containing 10-35% lipid.3. Structure of Grain94.1 CarbohydratesAbout 83% of the DM of grains consists of carbohydrates.Corn contains about 70% soluble carbohydrate, over 90% of which is highly digestible starch.The carbohydrate fraction of grain is composed primarily of pentosans（戊聚糖)

7、, starch, dextrins(糊精）, sugars, cellulose and hemicellulose（半纤维素）.4. Nutrient Composition of Grains104.1 CarbohydratesGrains are generally considered low in fiber (2%, although oats (12.2%) are relatively high in CF, having about double the fiber of barley (6.3%) and four to six times the fiber in c

8、orn(2.5%), wheat(2.2%), grain sorghum(2.7%).In wheat, about of starch is in the form of amylose (直链淀粉) while the remainder is amylopectin(支链淀粉).4. Nutrient Composition of Grain114.2 Protein CP: 8%-12%(DM)The grains generally are not good sources of protein, but fed in large amounts, they may contrib

9、ute a major proportion in the diet.Most of the CP is true protein, which is generally low in lysine and methionine and in some cases tryptophan and threonine. 4. Nutrient Composition of Grain124.3 LipidsRelatively high oil content due almost entirely to the oil of the germ. - Wheat, barley and rice:

10、1-2%; sorghum: 3%; whole corn: 4-6%.4. Nutrient Composition of Grain13The fatty acid in cereals are unsaturated, abound in both oleic and linoleic acid(亚油酸） (making up 90% of the FA in corn oil).Rancidity from oxidation of these unsaturated FA is no problem in the whole seed, but it can quickly beco

11、me so when the seed is ground.Produces soft body fat in non-ruminants.4. Nutrient Composition of Grain144.4 Minerals Grains generally contains more minerals than forages.All grains (especially corn) are extremely low in calcium but fair to good sources of phosphorus.Substantial portions of the phosp

12、horus are bound in the form of phytic acid.4. Nutrient Composition of Grain154.5 VitaminsVitamin A activity is low in all cereal grains except fresh yellow corn.Niacin is found in relatively high concentration in wheat, corn and rice.In corn, most of the niacin is in the form of niocytin(烟酰胺）which i

13、s biologically unavailable.4. Nutrient Composition of Grain164.5 VitaminsAll the grains are deficient in vitamins D and K.They are good sources of vitamin E. The oil of the wheat germ is one of the best known natural sources of vitamin E. Oats contains extremely high amounts of vitamin E.They are go

14、od sources of thiamin（硫胺素,vitB1） but they are low in riboflavin（核黄素，vitB2）. Corn are much lower in niacin than barley and wheat；Corn is also low in pantothenic acid （泛酸）and all the grains are deficient in vitamin B12 . 4. Nutrient Composition of Grain175. Corn/Maize（玉米）18Types of CornPop Corn(爆裂玉米）硬

15、粒玉米（Flint Corn）Dent Corn，马齿型玉米Sweet Corn（甜玉米）Waxy Corn（蜡质玉米）Pod Corn（荚玉米）19Flaked Corn grain 20 Starch and energyLarge endosperm contains lots of starch：65% starchDE（pig）: 3.39Mcal/kg；ME（chick）: 3.22Mcal/kgLow in CF： 2%6.1.1 Shelled corn（玉米粒）21Protein CP：8-9low BV.low in methionine. 6.1.1 Shelled co

16、rn（玉米粒）2270% of protein in the endosperm is lowly digestible. - Half of the protein consists of zein (玉米醇溶蛋白) which is especially poor in lysine, and tryptophan（色氨酸）. - Glutelin(玉米谷蛋白）occuring in lesser amount in both endosperm and germ is a better source of lysine and tryptophan.6.1.1 Shelled corn（

17、玉米粒）23EE：4linoleic acid（亚油酸）59oleic acid（油酸）27stearic acid（硬脂酸）2linolenic acid（亚麻酸）0.8arachidonic（花生油酸）0.2 d. ASH: Shelled corn（玉米粒）24e. Corn is extremely low in calcium (0.03%) but fair（中等的） in phosphorus (0.29%) content.f. It is quite deficient in vitamin B12 and low in riboflavin（核黄素）, ni

18、acin and pantothenic acid(泛酸）, niacin is bound in an unavailable form.g. Yellow corn is rich in carotene, lutein（叶黄素）and cryptoxanthin （玉米黄质）(precursor of vitamin A).6.1.1 Shelled corn（玉米粒）251. Definition Ground ear corn consists of whole ears of corn (grain and cob) ground to varying degrees of fin

19、eness.2. Constitution - It has been considered to be about 80% grain and 20% cob. - It is higher in fiber and lower in available energy than ground shelled corn. 6.1.2 Ground ear corn (Corn and cob meal) (粉碎玉米穗）263. Usage - They are often fed to cattle and sheep. - It may be used in rations for matu

20、re swine to limit energy intake. - It should not be fed to growing-fattening pigs or poultry since they can make little use of the cob. 6.1.2 Ground ear corn (Corn and cob meal) (粉碎玉米穗）276.1.3 Genetic mutants of corn 1.奥帕克2号(Opaque-2)Purdue university (1963)Lysine: 3.4% (2.0% for normal corn)High le

21、vels of tryptophan(0.16%, normal corn 0.09% )Increase arginine, histidine, valine, and methionine.May have advantage in monogastric diets but yields are typically lower.282.弗洛里-2号 (Floury-2)Higher levels of lysine, methionine and other essential amino acid.3. High Oil Corn :7% oil vs normal 4%.4. Lo

22、w phytate corn（低植酸玉米）6.1.3 Genetic mutants of corn 29Typical CornOPTIMUM HOC Endosperm:StarchEmbryo:Rich in OilTypical Corn vs Optimum High Oil CornMore Energy301.Composition It is quite similar to corn in composition and feeding value. Higher in protein (14.2% vs. 9.6%) and quality than corn. About

23、 twice as much as lysine and tryptophan as does corn. CF: 3%Ca :0.05%, P: 0.4%High arabinoxylan(阿拉伯木聚糖)content which is the primary anti-nutritional factor .6.1.4 Wheat grain(小麦）312. The use of wheat grainFinely ground wheat tends to develop pasty(糊状的）, doughy （柔软的）consistency(连结）upon chewing.Unadap

24、ted ruminants and horses that receive large amounts may develop digestive upsets（消化紊乱） and death can result. May pack in stomach if ground too fine, so it is usually coarsely ground or cracked for feeding.Fed with other more fibrous grains.6.1.4 Wheat grain(小麦）326.1.5 Barley grain（大麦）Rolled Barley G

25、rain (压扁大麦）Hulled Barley （皮大麦）331. Composition Higher in protein (10-15%) and lysine（0.6%） than corn（0.18%）It has an amino acid distribution similar to oats and wheat.Higher in starch( 70%) Ca :0.06%; P : 0.5%Lower in energy than corn6.1.5 Barley grain（大麦）34 2. Anti-nutritional factor: beta- glucans

26、 (-葡聚糖）In the endosperm cell wallNegative nutritive factor for monogastricsNo problem with ruminants although may be involved in bloat6.1.5 Barley grain（大麦）353. Feeding valueBarley is a palatable but fibrous (7%) feedBarley may be used to replace up to half of the corn in rations for fattening anima

27、ls without materially affecting their performance.Limits its use for monogastrics, especially poultry and young growing pigs.The firmer, leaner, carcasses produced than with corn(比饲喂玉米生产出的胴体更坚实和更瘦） 6.1.5 Barley grain（大麦）36Composition Protein and amino acidsOats are higher than corn in CP (10.8% vs.

28、9.6%) With an amino acid makeup similar to wheatBeing inadequate in lysine, methionine, cystine, and threonine. 6.1.6 Oats grain（燕麦） 37 6.1.6 Oats grain（燕麦） Oats are higher than corn in CF (10-18%vs 2.6%)They have a higher oil content than corn, but this is not enough to offset the higher fiber cont

29、ent nor to affect the body fat of animals consuming them.A little higher in calcium（ 0.09%） and phosphorus （0.3%）.Oats contain little carotene.382. Feeding value Oats are palatable but a poor energy source and not a good fattening feed because they are lower in starch than corn, grain sorghum, or wh

30、eat. Oats usually are rolled, crimped（压扁）, or ground for feeding.6.1.6 Oats grain（燕麦） 396.1.7 Oat groats（去壳燕麦粒） (1) Since most of the feeding value of oats grain is found in the kernel, oat groats are very high in feeding value.(2) Usually they are too expensive for general livestock feeding.(3) The

31、ir use usually is restricted to special diets such as early weaning rations for pigs.40Oats41Oats426.1.8 Sorghum grain（高 梁）43高粱（sorghum）44CompositionProtein and amino acidsCP: 6-12%Inadequate lysine（0.3%）, tryptophan （0.1%）and threonine（0.3%）.Tight protein matrix encapsulates starch molecules, so di

32、gestible energy is lower, this can be overcome largely by steam rolling（蒸汽压扁） .6.1.8 Sorghum grain（高 梁）45It is low in oil (2% -3%) than maize.CF : 2%.Ca : 0.03%,P : 0.3%.Contains tannins which are the anti-nutritional factor in sorghum.6.1.8 Sorghum grain（高 梁）462. Feeding valueGrain sorghum may be u

33、sed to replace 50% or more of the corn in the ration for most livestock without affecting animal performance.They are hard and must be ground, rolled to obtain the greatest feeding value. When so processed they have nearly the feeding value of corn.6.1.8 Sorghum grain（高 梁）471. MoistureLess than 12%W

34、hen exceed 30%: sprouting can occur.2. TemperatureAs the temperature of storage is decreased, the number of problems associated with storage likewise decreases.6.1.9 Grain storage481. Source of grain milling by-products Most of the grains are milled in some manner for the preparation of foods for hu

35、man consumption. In these milling processes, a number of by-products are produced which are generally considered to be of little value to human but which can be and are used extensively as livestock feeds.6.2 Grain milling by-products (谷物磨粉的副产品）496.2 Grain milling by-products (谷物磨粉的副产品）2. Classes of

36、 grain milling by-productsWheat bran, wheat middlings and shorts（ 麦麸和次粉）Rice bran(米糠）, rice polishings (细米糠）and rice mill feed(粗糠）Dried bakery product（干面包屑） 501. Wheat bran, wheat middlings and shorts（ 麦麸和次粉）Wheat bran（麦麸）It consists primarily of the seed coat of wheat removed in the manufacture of

37、wheat flour.Composition CP: 14-18%CF:12%, as a source of bulkP:1%;Ca: 0.1%an excellent source of vitamin E51Usage Primarily it is used in rations for horses, dairy cows, brood sows（种母猪）, and beef ,seldom is it used in rations for feedlot steers （肥育阉牛）, growing-fattening pigs, or poultry.Its use usua

38、lly is limited to about 10% of the ration because of its bulkiness and laxative nature.1. Wheat bran, wheat middlings and shorts（ 麦麸和次粉）52 1. Wheat bran, wheat middlings and shorts（ 麦麸和次粉）Wheat middlings and shortsWheat middling(次粉)must consist of fine particles of wheat bran, shorts, germ ,and flou

39、r, and some of the offal（废弃物） from the “tail of the mill” obtained in the usual process of flour milling.All consist of mixtures of fine particles of bran and germ, the aleuronic layer（糊粉层）, and coarse flour in varying proportions. 53 1. Wheat bran, wheat middlings and shorts（ 麦麸和次粉）Composition a. T

40、hey ordinarily are lower in fiber and higher in available energy than bran and are used primarily as a source of energy in the ration. - Wheat middlings (次粉)must not contain more than 9.5% CF (The Association of American Feed Control Officials) - Shorts (次麦粉)are same as wheat midds except must conta

41、in no more than 7% CF.54Wheat middlings（次粉）CP:14-18%: Excellent source of protein EE:3.5-3.8CF:8%P:1%; Ca:0.1% Nice addition to creep diets(幼畜补料） 1. Wheat bran,wheat middlings and shorts（ 麦麸和次粉）552.Rice bran(米糠）and rice mill feed(统糠）Rice bran :Consists primarily of the seed coat and germ that are re

42、moved from rice grain in the manufacture of polished rice for human consumption.562.Rice bran(米糠）and rice mill feed(统糠）Composition (1)While not as high in protein( 14%), is otherwise comparable to wheat bran in feeding value. (2) It has about 15% oil, which becomes rancid and causes soft fat when fe

43、d to swine.(3) P:1.6%, Ca: 0.08%.57Feeding value - high content of fat (15%) and fiber( 9) - lack of palatability - it usually is limited to not more than approximately 1/3 of the ration concentrates.2.Rice bran(米糠）and rice mill feed(统糠）582.Rice bran(米糠）and rice mill feed(统糠）.Rice mill feed (统糠）(1)

44、Rice mill feed are bran plus hull(2) CP:5-6%(3) CF:30-40%(4) Lowly digestible primarily filler593. Hominy feed（玉米麸）1. Definition - Hominy feed is a by-product of the manufacture of hominy（玉米片）, hominy grits（玉米粗粉）, and corn meal for human consumption. - It is a mixture of corn bran, corn germ (with o

45、r without some of the fat removed), and varying amounts of the finer siftings of the starchy portion of the corn grain. 603. Hominy feed（玉米麸）2. Nutrient characteristics -It is similar to corn in composition, although usually it contains slightly more protein(10.9%) and is higher in fiber(5.0%).- The

46、 DE and ME values for non-ruminants(非反刍动物） are lower because of the corn bran.- Hominy feed is about equal to corn in feeding value for various classes of live-stock.- It must contain not less than 4% EE and will tend to produce soft pork when used as a major component of swine rations.614. Dried ba

47、kery product（干面包屑）(1)Dried bakery product is similar to corn in composition except that usually it is much higher in fat (12-16%) and may contain a considerable amount of salt.(2)Its use should be limited to not more than about 20% of the total ration.62(3) Similar to composition of wheat except for

48、 EE content (12-16%).(4) CP: 11%(5) Low fiber(6) Inconsistency4. Dried bakery product（干面包屑）631. Characteristics of roots and tubers (1) Fresh tubers are generally not as high in energy as the grains, when considered on a DM basis, they are relatively good sources of energy.(2) They generally have li

49、mited amounts of protein.(3) Contain very little carotene except for carrots and sweet potatoes.6.3 Roots and Tubers （块根和块茎）64(4) Calcium and vitamin D levels are extremely low.(5) Best results are secured in most animals when they are limited to a replacement of not more than of the grain ration. 6

50、.3 Roots and Tubers （块根和块茎） 656.3 Roots and Tubers （块根和块茎）2.Dried sweet potatoes or sweet potato meal(1) Sweet potatoes will outproduce most other crops (even corn) in yield of digestible carbohydrates per acre; however, they are relatively costly to produce.(2) They are low in protein, calcium and

51、phosphorus.(3) High in carotene.66(4)Swine do not seem to relish and do not perform particularly well on this product.Cooking increases the value. Pigs fed high levels of them tend to be paunchy（大肚子的）and have a low dressing percentage（屠宰率）.At higher levels, feeding value somewhat is below that of co

52、rn.6.3 Roots and Tubers （块根和块茎）67(5) Replace not more than 50% of the corn in rations for cattle and sheep.It is worthy 90%-100% as much as corn for beef cattle, dairy cattle, and sheep.6.3 Roots and Tubers （块根和块茎）686.3 Roots and Tubers （块根和块茎）3. PotatoesThe carbohydrate in them is mostly starch (60

53、%-80% of the DM).CP:6%-9%(DM).They are low in calcium (0.04% DM) and not high in phosphorus (0.2% DM), and some of the phosphorus is bound as phytate.They are deficient in fat-soluble vitamin and B12, but are fair sources of several of the B vitamins6970(5) Alkaloids(生物碱） They are toxic to animals.

54、Young sprouts in sprouted potatoes and potatoes that have become green from light exposure are likely to be high in these alkaloids.Removal of the sprouts or peels and cooking reduces the likelihood of toxic effects.The principal alkaloid is solanine（龙葵碱）.6.3 Roots and Tubers （块根和块茎）71（6）Feeding val

55、ue of potato-Animals should be accustomed to them gradually, as they are not palatable.-Raw potatoes should not be fed in too large amounts, as they may cause scours（腹泻）.6.3 Roots and Tubers （块根和块茎）726.3 Roots and Tubers （块根和块茎） 4 Dried beet pulps（甜菜渣）Composition High in carbohydrate, but much of th

56、e them are complex cell-wall constituents（细胞壁成分），CF：20%.Low in fat (0.5%). Not high in protein (9%) .Are deficient in both fat-soluble and B vitamins.73Usage Used to provide bulk to diets （增加日粮的体积）As an appetizer（开胃剂）As a mild laxative(轻泻剂）As a source of energy6.3 Roots and Tubers （块根和块茎）74Usage Ver

57、y palatable, but higher levels will reduce intake.Usually it is used to replace not more than about 20% of the grain in the ration.Fed to dairy cattle but sometimes also fed to horses and used to fatten cattle and sheep.Is well digested by ruminants, but the bulkiness limits their value for nonrumin

58、ants.6.3 Roots and Tubers （块根和块茎）75Definition Molasses is a liquid energy feed that is highly palatable, digestible and are rich in carbohydrates.6.4 Molasses766.4 MolassesUsage Usually is used in rations for cattle, sheep, and horses for the following reasons.To improve ration acceptability.To improve rumen microbial activity.To reduce dustiness of ration.As a binder for pelleting(制粒时作为黏结剂）As a source of energy.As a source of carbohydrates in grass silage.77It can be laxative and will tend