Class Note for HCS 412 at OSU 07
Class Note for HCS 412 at OSU 07
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This 5 page Class Notes was uploaded by an elite notetaker on Friday February 6, 2015. The Class Notes belongs to a course at Ohio State University taught by a professor in Fall. Since its upload, it has received 21 views.
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Date Created: 02/06/15
Harvest Management Ch 16 pg 377388 Dr Mark Sule Intrndllctinn Harvest deersrorrs m umee Yleld Forage quallty Stand perslsterree Inseet damage harvests can be Dlsease lnfestanon held and storagelosses too dry too wet ram 7 all merease losses PROFIT all the above atreet pro t Relanonshlp between gowm stage yleld and quallty Hg 16 8 pg 383 wantliv am mt Full Pm Flaw Flower Flown Effect of Harvest Tlmmg on Root Reserves m Alfalfa mg 4 6 pg 88 Ruut reserve mwlh Sullnkh m mu tamrs name any bhum Root Reserves m Areut System see g 4 8 pg 90 for a 24ml sysLEm Harvest Management Seeding year Harvest depends on seeding date Spring seeding no companion crop Late summer seedings 7 First Harvest Timing in Established Stands 0 o as plants mature forage quality o basing harvest on maturity can be deceiving 0 use PEAQ method for alfalfa o for dairy quality grass Summer Harvest Timing 0 can generally use o intensive cutting can be done requires 0 o Fall Harvest Cautions increased increase roots need time to is the forage REALLY needed Fall Harvest Tips complete last harvest by do NOT harvest during late September amp October cut a er 25F for several hours if fall harvesting select elds that are well drained good fertility amp good pH is the forage REALLY needed Alfalfa Quality by Maturity Stage CP ADF NDF RFV 23 2 8 3 8 164 20 29 40 154 18 3 1 42 144 17 3 5 46 125 15 37 50 1 12 Matching Forage to Animal Needs Need to know 0 Energy Requirements Animals with requirements need forage eg lactating animals 0 Intake Potential Animals that have to eat large amounts of feed need 0 Amount of forage fed Forage quality not that important for animals fed low forage diet e g feedlot steers 0 Economics Cost of feed relative to value of product A high producing dairy cow generates 3000yr in gross income a gestating beef cow generates 450yr Forage Quality for Beef Cows Beef cows TDN 56 to 62 ADF NDF CP Grass 3742 5769 10 13 Alfalfa 3339 4350 1720 Mix 3540 4855 1518 Note high ber low TDN 0 CP less than 10 tend o TDN values less than 55 0 Most beef cows require less than high lactation breeds in first 3 months need 1214 CP CP fed in excess is simply excreted in urine no value to the cow Forage Quality for Dairy Average producing cow RHA lt 18000 NEL gt06 Mcallb ADF lt35 NDF lt60 Grass lt48 Legume High producing and early lactation NEL gt064 Mcallb ADF lt32 NDF lt55 Grass 50 is ideal lt44 Legume lt42 is better Forages lower in quality reduce intake and usually result in lower milk production Difficult to balance diets to maintain good intake with low quality forages Assessment of Moisture Content of Hay A Practical Guide Moisture Condition 30 40 Leaves begin to rustle and do not give up moisture unless rubbed hard Juice easily extruded from stems using thumbnail or knife or with dif culty by twisting in hands 25 30 Hay rustles a bundle twisted in the hands will snap with difficulty but should extrude no surface moisture Thick stems extrude moisture if scraped with thumbnail 20 2 50 Hay rustles readily a bundle will snap easily if twisted leaves may shatter a 0 few juicy stems remain 1 5 200 Swathmade hay fractures easily snaps easily when twisted juice dif cult to 39 0 extrude Reproduced from Hoard s Dairyman 132 1987 Forage Growth staging Methods Alfalfa Maturity Visual Rating from NAAIC Standard Tests 1 Vegetative stems have no buds or owers 2 Early bud l33 stems have buds 3 Mid bud 3465 stems have buds 4 Late bud 66 100 stems have buds no owers present 5 Early ower l33 stems have open owers 6 Mid ower 3465 stems have open owers 7 Late ower 66100 stems have open owers no seed pods present 8 Post ower stems have pods or seeds Alfalfa Stem Staging from Kalu and Fick 1981 0 Stems lt 16 cm n0 buds or owers 1 Stems 1630 cm n0 buds or owers 2 Stems gt30 cm n0 buds or owers 3 12 nodes with Visible buds n0 owers 4 3 or more nodes with buds n0 owers 5 1 node with an open ower n0 seed pods 6 2 or more nodes with open owers n0 seed pods 7 13 nodes with green seed pods 8 4 or more nodes with green seed pods 9 Nodes with mostly brown mature seed pods Grass Maturity Visual Rating from Moore et al 1991 VE Emergence of rst leaf V1 First leaf collared V2 Second leaf collared Vn Nth leaf collared E0 Onset of stem elongation El First node palpableVisible E2 Second node palpableVisible En Nth node palpableVisible R0 Boot stage R1 In orescence emergence rst spikelet Visible R2 Spikelets llly emerged but peduncle not emerged R3 In orescence emerged and peduncle llly elongated R4 Anther emergenceanthesis R5 Post anthesis SO Seed caryopsis Visible Sl Milk stage S2 So dough
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