AnSc 318 Examination 2 Review Sheet Spring 2023 Review Session March 24 Fri 4 00 PM in Room 115 Kleberg Center Assigned Readings for Exam 2 Canvas Beef Cow Nutrition KSU publication Canvas Roughages Pp 114 159 Lecture Notes Feedstuff characteristics Forage toxicity issues Dr Tam Garland Beef cow calf nutrition Growing and Finishing Cattle Nutrition Through slide 21 Factors that affect NEg and protein requirements in growing finishing cattle Recall the Learning Objectives for the Feedstuff Characteristics lectures v Understand nutritional characteristics NDF CP Energy Ca and P that are distinctive between carbonaceous vs proteinaceous roughage and concentrate feedstuffs v Be able to classify feeds into one of these 4 categories v Be able to classify forage plants as either cool season grasses warm season grasses or legumes v Understand pros and cons of 4 methods used to harvest and incorporate forages into livestock feeding programs b alfalfa hay d rapeseed meal f soybean meal a bermudagrass hay c clover hay e fish meal Additional exam II review questions are also available on Canvas 1 Which of the following feedstuffs is lowest in crude protein 2 Which of the following feedstuffs are classified as carbonaceous concentrates 3 a soybean meal c clover hay e chopped alfalfa hay h corn Select the answer which correctly ranks the following forage classifications from highest to lowest in terms of digestibility b barley d urea f molasses i canola meal a 1 2 and 3 c 3 2 and 1 e 2 1 and 3 b 2 3 and 1 d 1 3 and 2 f 3 1 and 2 1 cool season grasses 2 warm season grasses 3 legumes 4 Which of the following feeds would be highest in acid detergent fiber 5 6 Which of the following silos will tend to have the greatest storage loss 7 a stave upright c horizontal trench The first acid produced during the ensiling process is a lactic c propionic e formic a wheat c dallisgrass hay e feather meal Feedstuffs in the proteinaceous roughage classification contain crude protein a more than 10 c less than 10 b cottonseed meal d meat and bone meal f urea b more than 20 d less than 20 b plastic airtight d air tight upright b acetic d butyric f oleic 1 8 You have leased an alfalfa field from your neighbor to supply your cattle with alfalfa hay next winter Half of the field gets harvested in June early bloom stage but the other half does not get harvested until July You take hay samples of both hays and have them sent to a commercial laboratory for analysis a Which hay will be highest in crude protein b Which hay will have a higher digestibility c Which hay will your cows be able to consume more of 9 Compare and contrast anaerobic fermentation that occurs in the rumen with anaerobic fermentation that occurs during the ensiling process 10 Which macromineral deficiency is most likely to be associated with grass tetany a sodium c manganese e zinc T or F On average warm season grasses are more digestible than cool season grasses T or F Cows fed hay containing 30 ADF will eat more than cows fed hay with 50 ADF b phosphorus d magnesium f sulfur 11 12 13 List 2 cool season grasses 14 List 2 warm season grasses 15 List 2 non grass carbonaceous roughages 16 17 T or F Field losses are higher when making hay compared to direct cut silage T or F Restricting protein intake of pregnant heifers during late gestation will help reduce calving difficulty at birth forage classes 18 Describe one method that can be used to minimize field losses in making hay 19 The negative effect of plant maturity on forage quality is greatest for which of the following 20 What proportion of dry matter weight of corn silage is comprised of corn grain a cool season legumes b cool season grasses c warm season grasses d warm season legumes a 25 b 50 c 75 Identify which of the following statements are true by placing an X in the appropriate 23 Body condition score can be used as a tool to determine if beef cows have been provided adequate macro and microminerals 24 Microbial fermentation in a silo yields much higher concentrations of propionic acid than microbial fermentation in the rumen of a cow The pH of ensiled material increases during the fermentation process A nonpregnant Angus cow weighing 1000 lbs will require more Mcal of NEm per day than a nonpregnant Brahman cow weighing 1000 lbs Corn gluten meal is classified as a carbonaceous concentrate Acetic acid concentration increase as the proportion of grain in the diet decreases Beef cows from breeding to weaning have higher NE requirements than late gestation beef cows How many of the following feeds would be classified as carbonanceous concentrates a 4 c 8 b 6 d 10 25 26 27 28 29 30 2 31 32 33 Corn grain Red clover hay Sudangrass Potato by products Oat grain Bermudagrass hay Soybean hulls Linseed meal Corn stover silage Barley straw Animal tallow Soybean meal Alfalfa hay Cottonseed meal Vetch hay Sugarcane molasses List two feedstuffs excluding grains or grain by products which are classified as a carbonanceous concentrates a b List two feedstuffs excluding grasses or grass hays that are classified as carbonanceous roughages a b What is the least critical stage of production for a cow calf operation with regards to the importance of nutritional quality of the ration to produce 15 lb milk per day 1200 lb Simmental cow Place on X in front of the animal that has the lowest NEm requirement only one X per row 1200 lb Brahman cow Crossbred cow with genetic potential Crossbred cow with genetic potential 1200 lb cow in a 5 F environment 1000 lb nonlactating cow 34 35 What is the difference between limit grazing vs strip grazing 36 What is the difference between rotational grazing vs first last rotational grazing 37 Briefly describe two disadvantages advantages to harvesting a forage as silage compared to 1200 lb cow in a 65 F environment 1000 lb lactating cow to produce 25 lbs milk per day harvesting the forage as hay 38 How can we prevent dallisgrass toxicity in cattle 39 Processing a grain like corn will cause digestibility in cattle to a increase b decrease c remain the same 40 Which of the following are classified as cool season grasses Circle all correct answers red clover ryegrass bahiagrass alfalfa approximately a 5 c 25 e 45 41 To successfully store forage as hay the moisture level of the forage must be reduced to 42 Which of the following supplements would be best to feed a cow consuming a forage that contains 60 TDN and 6 crude protein CP a corn TDN 90 CP 10 b soybean meal TDN 78 CP 42 c