Fat Beef Calf Fat Dairy Calf
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Introduction
Dairy cows need a tremendous amount of energy; a dairy cow weighing 1,400 lb and producing 70 lb/day of milk with 3.6% fatty and 3.three% protein needs most 33 Mcal/day of net free energy for lactation (NEFifty). Although the units are somewhat different, this is about 26 times more energy than for a person consuming a recommended two,000-calorie nutrition. Concentrates are college in free energy density than forages, only acceptable dietary effective fiber is needed to maintain rumen function, so concentrates demand to be limited in the nutrition. Thus, i of the chief purposes of feeding supplemental fat to dairy cows is to increase energy intake. Fats are college in energy density than carbohydrates and proteins; therefore, adding fat increases the free energy density of the nutrition. At the aforementioned fourth dimension, feed intake must be maintained; otherwise, an increase in energy intake may not occur. Feeding excessive amounts, especially unsaturated fat, can reduce feed intake and occasionally energy intake.
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Sources of Fats
Some of the common sources of fats fed to dairy cows are listed in Table 1. The most common whole oilseeds fed to dairy cows are soybeans and cottonseeds. Because of the value of the oils, the whole seeds of canola, linseed, safflower, and sunflower are not typically fed, just the respective meals that result after the oil is extracted are usually fed. The amount of oil remaining in some of these meals can be an important contributor to the total amount of fat in the diet. In add-on, several plant and creature by-products, such as distiller's grains (high and low fat available), hominy, fish meal, and meat and os repast, may contain ten% to 12% fatty. Fish meal is fed primarily as a high-quality, rumen-undegradable protein source, and the fatty acrid (FA) composition is distinctive, with virtually 24% of the fat being unsaturated FA with 20 or more carbons. Feeding grease, lard, or tallow requires these fats to exist heated for transport, storage, and mixing. Thus, special storage and handling equipment is needed. The costs of this equipment and the handling of liquid feed are deterrents for some producers who alloy these sources of fat in diets on the subcontract.
| Fat Source | % Fat | NE50-3x (Mcal/lb) | Unsaturated Fatty (% of fatty) |
| Oilseeds | |||
| Canola | 40 | 1.60 | 94 |
| Cottonseed | 20 | 0.88 | 71 |
| Linseed (flaxseed) | 36 | 1.22 | 89 |
| Safflower | 35 | 0.94 | 89 |
| Soybean (raw, roasted, extruded) | 20 | 1.25 | 85 |
| Sunfloweri | 28-42 | 0.87-1.29 | 83 |
| Animal Sources | |||
| Fish meal | x | ane.06 | 68 |
| Grease (pick white, yellow, etc.)2 | 99 | 2.06 | 67 |
| Lard (swine) | 99 | 2.06 | 64 |
| Tallow (beef) | 99 | ii.06 | 52 |
| ane Varieties vary with concentration of fat and fatty acid contour likewise as whether hulls are present. two These fats are primarily from the eating house industry, and quality can exist variable depending on the source and handling of the fats. | |||
Several commercial sources of fat are available that are rumen inert (exercise not cause reduction of fiber digestibility in the rumen), while some are designed to deliver specific FA to the cow. Well-nigh of these are in the form of calcium salts of FA or highly saturated FA. The calcium salt products usually are from palm oil (high in palmitic acrid; C16:0) or other plant sources (e.grand., soybean) and are in granular form. The highly saturated FA sources are processed into very modest beads (prills), much like in a powder class, to aid in digestibility and handling. Some of the commercial fatty products are developed to deliver higher amounts of C16:0 to the cows for possibly increasing milk fat yield given that milk has a relative loftier concentration of C16:0, and C16:0 may be more digestible than C18:0. Other fat sources are enriched in omega-iii FA (ordinarily from aquatic sources or linseed) which may positively influence reproductive and immune function.
Free energy Concentration and Cost
The amount of NEL from fat is primarily affected by the digestibility of the respective fatty source. The digestibility of the FA tin be affected by these factors:
- the physical nature of the fatty source (due east.g., gratuitous oil vs. in seed; seed ground vs. extruded; size of the prills, and so on)
- chemical course of the fatty source (eastward.g., triglyceride or free FA)
- dry matter (DM) intake every bit it affects rate of digesta passage
- FA intake as it might affect ruminal fermentation and FA absorption
- the FA composition of the fat source (eastward.grand., saturated vs. unsaturated).
As an example, tallow contains about xc% FA and 10% glycerol and has an energy value of well-nigh 2.06 NE50/lb (NRC, 2001; Table i). With the 6-year average of NEL beingness worth $0.10/Mcal NEL (St-Pierre, 2014), tallow would be worth on boilerplate well-nigh $0.21/lb (St-Pierre, 2014). Still, the volatility of energy prices has been huge in recent years; thus, the value of tallow can fluctuate over fourth dimension (Table 2).
| $/Mcal | 0.06 | 0.08 | 0.10 | 0.12 | 0.14 | 0.16 | 0.18 |
| $/lb tallow | 0.12 | 0.16 | 0.21 | 0.25 | 0.29 | 0.33 | 0.37 |
The cost of energy from fat is college than from carbohydrates, but due to the limitations discussed previously, fatty can increase energy intake of cows in situations in which additional starch cannot be fed because of acidosis concerns. The value of fatty based on energy provision will depend on the concentration of fat in the source, the digestibility of the FA, and, virtually important, the relative cost of NEL; notwithstanding, other aspects beyond energy, such equally FA composition and concrete form to better treatment properties, must be considered when evaluating the price for a fat source.
Level of Dietary Fat
The amount of fat to include in the diet should exist adamant based on the desirable energy concentration in the diet or intake of specific FA. Nevertheless, this should be determined based on the other ingredients in the diet (e.g., high- vs. low-quality fodder and level of unsaturated fat contributed by sources). High concentrations of fatty, peculiarly unsaturated fat, tin reduce fiber digestibility in rumen (and thus reduce feed efficiency), depress feed intake, and result in milk fat depression. The resultant lowered milk and milk fat yields tin can reduce profitability. Generally, 1% to 3% supplemental fatty in the diet can be fed without adverse effects; nevertheless, the amount of fat fed from common sources depends on the saturation level of the fat and fiber level in the diet. To illustrate this, Jenkins (1997) proposed the following equations to summate the corporeality of supplemental fat to add to a diet based on cobweb level in the diet and unsaturated FA (UFA) in the fatty source (Table 1):
Fat, % of diet DM = (half dozen × ADF)/UFA or
Fat, % of diet DM = (4 × NDF)/UFA,
where UFA = C18:1 + C18:2 + C18:3 as a pct of total FA, ADF = acid detergent fiber, and NDF = neutral detergent fiber. For example, a nutrition for dairy cows with 32% NDF and the consideration of using roasted soybeans, (iv x 32)/85 = 128/85 = 1.5% fat from the roasted soybeans. However, because roasted soybeans contain about 20% fat, then seven.5% of the nutrition could be roasted soybeans to provide 1.five% unsaturated fat in the diet from the soybeans.
The basal diet for dairy cows generally contains 2% to three% fat from plant sources (primarily from cereal grains, forages, and oilseed meals), then adding some other 1% to iii% from supplemental plant or animal sources results in about 5% fat in the diet. Beyond this concentration, rumen inert sources demand to be used to add together another 1% to 2%, resulting in 6% to 7% total fatty in the diet.
Very modest amounts of specialty fats (those that evangelize specific FA) are sometimes fed prepartum during the close-up dry out menstruation. Feeding supplemental fatty during early on lactation as an energy source has to be done with circumspection. Even though this period is characterized with trunk weight loss because the free energy demand for maintenance and milk yield exceed energy intake, calculation dietary fatty may non improve free energy status during this time. It tin actually be a detriment if the addition of the fat causes a depression in DM intake. Thus, low inclusion (approximately ane%) of natural or specialty fats is brash in diets of cows during early lactation. Subsequently 30 to 60 days in milk, the higher levels of fat can be fed that were discussed previously.
Summary
Dietary fatty will continue to play a role in provision of energy to lactating dairy cows, and the energy concentration for a FA source will primarily be determined by digestibility of the fat. Digestibility is affected by physical and chemic characteristics of the fatty source, FA intake, and FA composition of the fat source. The economic value of the energy from fatty will exist affected by marketplace costs of other energy sources such every bit cereal grains and alternative uses of fats. Fat must exist fed in moderation to dairy cattle. About 2% to 3% fat will be present from typical dietary ingredients, and initial levels of supplemental fat by and large will be one% to three% of dietary DM for increasing energy concentration of diets or commitment of some specific FA. Using mutual unsaturated sources necessitates basing the inclusion rate on the level of saturation and dietary cobweb concentration. Including an additional 1% to 3% supplemental fat (total dietary fat at 6% to 7%) ordinarily requires feeding of peculiarly processed fats that are ruminally inert. Although some positive aspects of specific FA on reproduction and amnesty have been identified, farther research is needed. Supplemental fat will go along to have a "space" in diets for dairy cattle, simply selection of sources should be determined based on cost, energy value, limerick of specific FA, and ease of handling and blending into diets.
Author Information
Maurice L. Eastridge
Department of Animal Sciences
The Ohio Land University
References
Jenkins, T. 1997. Success of fat in dairy rations depends on the amount. Feedstuffs Feb. 13, 1997, Effect:11-12.
National Research Council. 2001. Nutrient requirements of dairy cattle, seventh revised edition. Natl. Acad. Sci., Washington, DC.
St-Pierre, North.R. 2014. Milk prices, costs of nutrients, margins and comparison of feedstuffs prices. Buckeye Dairy News. Vol. 16, No. 4. Accessed September 29, 2014. http://dairy.osu.edu/bdnews/Book xvi Issue 4.html
Source: https://dairy-cattle.extension.org/feeding-fat-in-moderation-to-dairy-cows/
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