Beef Cattle Are the Domestic Animals That Are the Most Efficient Transformers of Grain Into Meat.

Beef cattle product, whether on range, improved pasture, or in the feedlot, is most economic when feedstuffs are used effectively. Immature growing grass or other high-quality pasture crops usually supply aplenty nutrients, such that mature and young growing cattle can consume sufficient skillful-quality mixed pasture (grasses and legumes) for normal growth and maintenance. Yet, mature pasture, crop residues, or forage crops harvested in a style that results in shattering, leaching, or spoilage may be and then reduced in nutritive value (particularly energy, protein, phosphorus, and provitamin A or β-carotene) that they are suitable only in a maintenance ration for adult cattle. Such feedstuffs should be supplemented if used for whatever other purposes.

The mineral content of forages is influenced past the corresponding mineral levels in the soil and by excess levels of some minerals that reduce the availability of others. Mature forages also may be lower in mineral content, peculiarly phosphorus. Ordinarily, supplemental minerals are supplied in a free-choice mineral mix or forcefulness-fed in the total mixed ration.

Sure nutrients are required by beef cattle in the daily ration, whereas others can be stored in the body. When body stores of a nutrient are high, eg, vitamin A, dietary supplementation is unnecessary until such stores are depleted. However, it may be difficult to determine when torso stores have been depleted until advanced signs of deficiency start to appear.

The following are dietary requirements for maintenance, growth, finishing, reproduction, and lactation in beef cattle.

H2o, although non considered a food per se, is required for regulation of body temperature, as well as for growth, reproduction, lactation, digestion, metabolism, excretion, hydrolysis of nutrients, transportation of nutrients and waste in the trunk, joint lubrication, plus many more functions. Restricting water intake results in impaired performance. An animal will expire more quickly from a water deficiency than from a deficiency of whatever nutrient.

Because feeds themselves incorporate water, and the metabolism of ingested feeds releases h2o (called metabolic water), non all of the fauna's water needs take to be met by drinking water. Thirst is the outcome of demand, and animals drink to see this need. The demand for water results from an increase in the electrolyte concentration in the body fluids, which activates the thirst mechanism.

Many factors, including temperature and body weight, touch on water consumption in cattle. An 800-lb (364-kg) heifer at an environmental temperature of 4.4°C (xl°F) can be expected to consume 6.iii gal. (23 Fifty) per mean solar day; at 21°C (70°F), this will increase to 9.two gal. (34.8 L). At the same 4.4°C temperature, a 400-lb (182-kg) heifer will consume ~4 gal. (15.1 L). Note that h2o consumption and body weight are not correlated by a straight-line relationship. A 900-lb (409-kg) lactating moo-cow at the iv.four°C temperature will consume eleven.4 gal. (43.1 L) per solar day.

Except for preruminant calves, beef cattle can meet their maintenance energy requirements from roughages of reasonably good quality (greenish, leafy, fine-stemmed, costless of mold and weeds). A shortage of energy may exist on overstocked pastures, with inadequate feed assart or poor-quality forages, or during a drought. For production, additional energy from concentrates or co-product feeds may exist necessary, particularly when forages of fair to poor quality are consumed.

Particularly in cold atmospheric condition, roughages of varying quality may have like maintenance free energy values. Heat released during digestion and assimilation—called "estrus increment"—contributes to the maintenance of torso temperature for wintering stock.

Protein requirements currently are evaluated equally metabolizable protein, which is interchangeable with absorbed protein. Metabolizable protein defines the protein more than nearly as that which is available to the creature for maintenance and production. It is defined as the combination of the truthful protein absorbed by the intestine, supplied past microbial synthesized protein plus undegraded intake protein (UIP). The latter oftentimes has been called "bypass" protein.

Energy deficiency due to low feed intake or intake of poor quality feed is the nearly common deficiency that limits growth, development in heifers and bulls, milk production, and reproduction, with protein deficiency beingness the next well-nigh mutual. Poly peptide deficiency of long duration eventually depresses appetite, with eventual weight loss and unthriftiness, even when ample energy is bachelor.

Feedstuffs vary profoundly in protein digestibility. For example, the protein of common grains and most protein supplements is ~75%–85% digestible, that of alfalfa hay ~seventy%, and that of grass hays usually 35%–l%. The protein of low-quality feeds, such equally weathered grass hay, range grass, or cottonseed hulls, is digested poorly. Thus, fifty-fifty though total poly peptide intake may announced to be acceptable, metabolizable poly peptide might be deficient.

A lack of protein in the nutrition adversely affects the microbial protein product in the rumen, which in turn reduces the utilization of low-protein feeds. Thus, much of the potential nutritive value of roughages (especially free energy) may be lost if poly peptide levels are inadequate.

Urea and other sources of nonprotein nitrogen (NPN) are used commonly in commercial protein supplements to supply one-tertiary or more than of the full nitrogen requirement. Such products are cleaved down readily by the ruminal microbiota protein to ammonia and and so synthesized to loftier-quality microbial protein. The apply of NPN needs bachelor sources of ample phosphorus, trace minerals, sulfur, and soluble carbohydrates for the microbial synthesis of utilizable protein. The corporeality of rough protein (% N × 6.25) supplied by NPN must be stated on the feed tag accompanying commercial supplements. Toxicity is not a serious problem when urea is fed at recommended levels and mixed thoroughly with the other ingredients of the ration. However, rapid ingestion of urea at levels >20 g/100 lb (45 kg) body wt may pb to toxicity (see Nonprotein Nitrogen Poisoning Nonprotein Nitrogen Poisoning ). Several urea-molasses liquid supplements, containing as much as 10% urea, currently are self-fed to beef cattle. Caution should be exercised when cattle are started on such supplements.

Qualitatively, beef cattle require the same mineral elements as do dairy cattle; even so, the relative quantities of the several minerals are different (run into Table: Requirements and Maximum Tolerable Levels of Minerals for Beefiness Cattle a Requirements and Maximum Tolerable Levels of Minerals for Beef Cattle a ). The minerals most apt to be deficient in beef cattle diets are sodium (as common salt), calcium, phosphorus, magnesium, zinc, copper, and selenium. In some areas, including the interior of the The states, iodine may be scarce in diets for pregnant cows; besides, there are regional deficiencies (probably reflecting soil deficiencies) of several trace minerals, including copper, cobalt, and selenium. Withal, there are areas where some mineral elements (eg, selenium, molybdenum) are present at toxic levels. Attempts accept been fabricated to correct natural soil deficiencies for trace minerals by soil fertilization practices. Thus, it is implied that a beef producer needs to know the mineral and trace mineral content of the feedstuffs used in cattle rations. A general approach to foreclose such deficiencies is to feed a commercial salt mineral mix developed for the geographic location of the herd.

The table salt (NaCl) requirement for beefiness cattle is quite depression (0.2% of the dry affair); nevertheless, there appears to be a satiety cistron involved—almost all animals appear to seek out common salt if it is not readily available. Range cattle may consume 2–two.5 lb (1 kg) salt/head/mo when forage is succulent merely almost half that amount when provender is mature and drier. When table salt is added to a free-choice poly peptide feed to limit intake, beef cows might consume >1 lb table salt/24-hour interval over long periods of time without adverse effects if they have enough of drinking water. Signs of a salt deficiency are rather nonspecific and include pica and reduced feed intake, growth, and milk production.

Calcium is the most arable mineral element in the body; ~98% functions as a structural component of bones and teeth. The remaining 2% is distributed in extracellular fluids and soft tissues and is involved in such vital functions equally blood clotting, membrane permeability, muscle contraction, manual of nerve impulses, cardiac regulation, secretion of certain hormones, and activation and stabilization of certain enzymes. Virtually roughages are relatively skillful sources of calcium. Cereal hays and silages and such crop residues are relatively low in calcium. Although leguminous roughages are excellent sources of calcium, even nonlegume roughages may supply acceptable calcium for maintenance of beef cattle. When cattle are fed such roughages produced on low-calcium soils, or when finishing cattle are fed high-grain diets with limited nonlegume roughage, a calcium deficiency may develop. Because lactating beefiness cows do not produce nearly the corporeality of milk that dairy cattle do, their calcium requirement is much less. Nevertheless, it is audio management to provide a costless-choice salt mineral mixture tailored to the environs and production class of the grazing cattle. Salt should always be mixed with mineral, considering table salt drives intake. Cows have nigh nix "nutritional wisdom," ie, they practice not seek out feedstuffs or minerals when they are deficient, with the exception beingness sodium, so adding mineral to the table salt mostly improves intake among cattle with costless-choice access to the mineral mix. The total ration should provide a calcium:phosphorus ratio of i.two to 2:i, with cows at minimum of ane.two:one and feedlot steers at minimum of 2:1. Wider ratios appear to be tolerated if the minimum requirements for each mineral element are met and if adequate vitamin D (exposure to sunlight) is available. Range cattle should be provided a mineral supplement that has as much or more phosphorus than calcium, because green fodder is many times higher in calcium. Inquiry has shown that intake amidst cattle receiving free-selection mineral mix is highly variable. One study showed that 14%–fifteen% of cows with gratis-choice access to mineral in block or loose form consumed zero mineral. The only fourth dimension cattle should be offered mineral gratis choice is when they are grazing and no other feed is beingness fed. If cows are consuming any other feed, the salt and mineral should be mixed with the ration then all cattle volition ingest the prescribed corporeality of mineral.

Approximately 80% of the phosphorus in the body is found in the basic and teeth, with the remainder distributed amidst the soft tissues. Phosphorus may exist deficient in some beef cattle rations, because roughages often are low in phosphorus. Furthermore, as forage plants mature, their phosphorus content declines, making mature and weathered forages a poor source. Phosphorus has been described as the about prevalent mineral deficiency for grazing cattle worldwide. Well-nigh natural protein supplements are adequately skillful sources of phosphorus. Because acceptable phosphorus is disquisitional for optimal operation of beef cattle, including growth, reproduction, and lactation, a phosphorus supplementation program is recommended using either a free-option mineral mixture or directly supplementation in the diet. In a phosphorus deficiency, reduced growth and efficiency of feed conversion, decreased appetite, impaired reproduction, reduced milk production, and weak, delicate bones can exist expected. There does non appear to be any reward to feeding more than phosphorus than is recommended. Furthermore, feeding excess phosphorus contributes to increased environmental pollution. Good sources of supplemental phosphorus include steamed bone meal, mono- and dicalcium phosphate, defluorinated stone phosphate, and phosphoric acid. Corn co-products like corn gluten and distillers grains with solubles are also high in phosphorus. Because almost grains are relatively skillful sources of phosphorus, feedlot cattle rarely suffer a phosphorus deficiency, although phytic acid chelation of phosphorus in grains may render up to half of it unavailable—particularly for monogastric animals such as swine and poultry.

Magnesium maintains electrical potentials across nervus endings. In a deficiency, the lack of command of muscles is obvious. However, normally deficiencies are non anticipated. A magnesium deficiency in calves results in excitability, anorexia, hyperemia, convulsions, frothing at the oral cavity, and salivation, but such a condition is uncommon. Usually, a magnesium deficiency is seen in the jump in more mature grazing cattle nether field conditions (ie, grass tetany, encounter Hypomagnesemic Tetany in Cattle and Sheep Hypomagnesemic Tetany in Cattle and Sheep Hypomagnesemic tetany is a complex metabolic disturbance characterized by hypomagnesemia (plasma tMg The disorder occurs after a decrease in plasma Mg concentration when absorption of dietary... read more ). The initial signs are nervousness, reduced feed intake, and muscular twitching about the confront and ears. Animals are uncoordinated and walk with a stiff gait. In advanced stages, affected cows fall to the ground, convulse, and die shortly afterwards. A claret sample from affected cows would show a serum magnesium level of <2 mg/dl,="" with="" a="" corresponding="" calcium="" deficiency.="" this="" condition="" is="" sufficiently="" prevalent="" that="" many="" beef="" cow="" herd="" managers="" supplement="" in="" the="" spring="" with="" magnesium="" oxide="" at="" 28–56="" one thousand/head/day.="" beef="" cows="" generally="" do="" not="" like="" magnesium="" oxide;="" dilution="" past="" mixing="" it="" with="" ground="" corn="" or="" incorporating="" information technology="" into="" a="" free-choice="" liquid="" supplement="" improves="">

Potassium is the major cation in intracellular fluid and is important in acid-base balance; information technology is involved in regulation of osmotic pressure, water balance, muscle contractions, nervus impulse transmission, and several enzymatic reactions. Potassium deficiencies normally are non predictable in cattle diets because virtually forages are good sources, containing 1%–iv%. In fact, the high potassium content of spring pasture grass is ane of the highest risk factors for grass tetany (see Hypomagnesemic Tetany in Cattle and Sheep Hypomagnesemic Tetany in Cattle and Sheep Hypomagnesemic tetany is a complex metabolic disturbance characterized by hypomagnesemia (plasma tMg The disorder occurs after a decrease in plasma Mg concentration when absorption of dietary... read more ). A potassium deficiency might be predictable when diets extremely high in grain are fed (eg, in finishing cattle), because grains may contain <0.5% potassium.="" a="" marginal="" to="" scarce="" level="" of="" potassium="" in="" growing="" and="" finishing="" cattle="" results="" in="" decreased="" feed="" intake="" and="" charge per unit="" of="" gain.="" however,="" this="" effect="" is="" subtle="" and="" probably="" would="" not="" be="" noticed="" other="" than="" by="" the="" very="" experienced="" cattle="" feeder.="" body="" stores="" of="" potassium="" are="" small,="" and="" a="" deficiency="" may="" develop="" quickly.="" information technology="" is="" adept="" practice="" to="" supplement="" rations="" for="" growing="" and="" finishing="" cattle="" such="" that="" they="" will="" contain="">0.6% potassium on a dry out-matter basis.

Copper and cobalt deficiencies are likely more widespread than previously thought. Cobalt functions as a component of vitamin B₁₂. Cattle practice not depend on dietary vitamin B₁₂, because ruminal microorganisms can synthesize it from dietary cobalt. In cattle, therefore, a cobalt deficiency is a relative vitamin B₁₂ deficiency, and such cattle testify weight loss, poor immune function, unthriftiness, fatty degeneration of the liver, and stake pare and mucosa. Copper functions equally an essential component of many enzyme systems, including those that involve the production of blood components. Recommended levels of cobalt and copper should exist provided in the diet, either past supplementation of the total mixed ration or as part of the complimentary-option mineral mix or supplemental mix.

Iodine is an integral part of thyroxine and, as such, is largely responsible for control of many metabolic functions. Typically, coastal regions subjected to iodine-carrying winds off the body of water accept abundant supplies of iodine; however, in inland soils (in the USA, particularly between the Allegheny and Rocky mountains), the soil more often than not does not have sufficient iodine to meet about livestock needs. Iodine requirements in cattle can be met adequately past feeding stabilized iodized salt.

Although cattle probably have a metabolic requirement for all the known vitamins, dietary sources of vitamins C and K and the B-vitamin complex are not necessary in all but the very young. Vitamin K and the B vitamins are synthesized in sufficient amounts by the ruminal microflora, and vitamin C is synthesized in the tissues of all cattle. Yet, if rumen function is impaired, as by starvation, nutrient deficiencies, or excessive levels of antimicrobials, synthesis of these vitamins may be impaired.

Vitamin A can be synthesized from β-carotene independent in feedstuffs such as dark-green forages and yellow corn. However, this ability varies amidst breeds; Holstein cattle mayhap are the most efficient converters of carotenes, whereas some of the beefiness breeds are much less efficient. Therefore, providing supplemental vitamin A to beef cattle should be considered. Vitamin A is one of the few vitamins that cattle shop in their livers—as much as a six-mo supply. Cattle on a diet deficient in vitamin A may non begin to show signs for several weeks. Newborn calves, which have minor stores of vitamin A, depend on colostrum and milk to see their needs. If the dam is fed a ration low in carotene or vitamin A during gestation (eg, in winter), severe deficiency signs may become apparent in the young suckling calf within ii–iv wk of nascence, while the dam may appear healthy.

Information technology is audio practice to provide 2–5 lb (ane–ii kg) of early-cut, good-quality legume or grass hay in the daily ration of stocker cattle and significant cows to prevent vitamin A deficiency. Near commercial protein and mineral supplements are fortified with dry, stabilized vitamin A. The daily requirements for beef cattle appear to be ~5 mg of carotene or 2,000 IU of vitamin A/100 lb (45 kg) trunk wt; lactating cows may require twice this amount to maintain high vitamin levels in the milk.

Vitamin A deficiency under feedlot conditions can crusade considerable loss to cattle feeders, especially if high-concentrate and corn silage rations low in carotene have been fed. Destruction of carotene during hay storage or in the GI tract, or the failure of beefiness cattle to convert carotene to vitamin A efficiently, may increase the demand for supplemental vitamin A. Growing and finishing steers and heifers fed low-carotene diets for several months require 2,200 IU of vitamin A/kg of air-dry ration. Commercial vitamin A supplements are not expensive and should exist used when such rations are fed and any danger of a deficiency exists. An alternative manner to supply supplemental vitamin A is past IM injection: studies evidence that an extremely loftier dose (6 million U) would be needed to supply adequate vitamin A for 7 mo. As with all vitamins and minerals, a steady supply in the diet is the platonic method for supplementation.

Vitamin D deficiency is comparatively rare in beefiness cattle, because they are usually outside in direct sunlight or fed dominicus-cured roughage. In northern latitudes during long winters, or in prove calves kept in the barn or turned out only at dark, a deficiency is possible. The ultraviolet rays of sunlight convert provitamin D found in the skin of animals (vii-dehydrocholesterol) or in harvested plants (ergosterol) to agile vitamin D. Directly exposure to sunlight, consumption of sun-cured feed, or supplementary vitamin D (300 IU/45 kg body wt) prevent a deficiency.

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Source: https://www.merckvetmanual.com/management-and-nutrition/nutrition-beef-cattle/nutritional-requirements-of-beef-cattle