Utilization of Urea and Fat in Meal and Pelleted Rations for Steers

Jt, Thompson; Nw, Bradley; Co, Little

doi:10.2527/jas1967.264830x

Cited by 14 publications

(3 citation statements)

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“…Several studies (Jones et al, 1961;Thompson et al, 1967;Hatch et al, 1972;Buchanan-Smith et al, 1974) have implicated urea supplementation as a negative factor affecting acceptability or consumption of fat-supplemented diets. However, because positive performance responses to fat supplementation were observed for urea-supplemented diets in the present study as well as that of Zinn (1988), the general applicability of this concept may be questioned.…”

Section: Resultsmentioning

confidence: 99%

Influence of Level and Source of Dietary Fat on Its Comparative Feeding Value in Finishing Diets for Steers: Feedlot Cattle Growth and Performance

Zinn¹

1989

Journal of Animal Science

124

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Two hundred twenty-eight crossbred steers (304 kg) were used in a 125-d comparative slaughter trial to evaluate the influence of level and source of supplemental fats on their feeding value for feedlot cattle. Dietary treatments consisted of a steam-rolled, barley-based finishing diet containing 1) no supplemental fat; 2) 4% yellow grease (YG); 3) 4% blended animal-vegetable fat (BVF); 4) 8% YG; 5) 8% BVF or 6) 6% BVF and 2% crude soybean lecithin. Increasing level of supplemental fat in the diet resulted in linear improvements (P less than .01) in weight gain, feed conversion and NE value of the diet. Estimated NE values of YG and BVF were similar and did not appear to be influenced by level of supplementation, averaging 5.78 and 4.61 Mcal/kg for maintenance and gain, respectively. Fat supplementation resulted in linear increases in empty body fat (P less than .01), kidney, pelvic and heart fat (P less than .01) and marbling score (P less than .05). Partially replacing BVF with lecithin did not influence (P greater than .10) steer performance, carcass merit or estimated NE value of the diet. The comparative feeding value (in terms of both diet acceptability and NE value) of the supplemental fats tested was similar and was apparently not influenced by level of supplementation up to 8% of diet DM.

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Section: Resultsmentioning

confidence: 99%

Influence of Level and Source of Dietary Fat on Its Comparative Feeding Value in Finishing Diets for Steers: Feedlot Cattle Growth and Performance

Zinn¹

1989

Journal of Animal Science

124

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“…Bradley et al (1966) reported a decrease in dry matter and ~" energy digestion, no difference in crude protein digestion and an increase in ether extract digestion when comparing steers fed a low-fiber corn-based ration to steers fed the same rations 5% fat or 5% fat plus 1.5% urea. Thompson et al (1967) reported a decrease in NPN and non-ammonia NPN in ruminal fluid of steers fed low-fiber corn-based rations containing 5% fat or 5% fat plus 1.5% urea when compared to the steers fed the same ration with 1.5% urea. Davidson and Woods (1958) and Robertson and McKirdy (1964) conducted digestion trials and reported that the addition of oil to finishing rations for lambs and steers decreased organic matter and protein digestion as well as nitrogen retention, but increased ether extract digestion.…”

Section: Resultsmentioning

confidence: 96%

“…Urea is widely used as a source of nitrogen and ,;mall amounts of tallow are used as an energy" source in finishing rations for beef cattle, providing the cost is attractive. Several workers (Jones et al, 1961;Bradley et al, 1966. Thompson et al, 1967Hatch et al, 1972) have indicated that some combinations of tallow and urea result in interactions which may produce negative effects on gains, as compared to feeding either tallow or urea alone.…”

Section: Introductionmentioning

confidence: 99%

Effects of Tallow and Urea on in Vitro Rumen Fermentation and Nutrient Digestion in Sheep

Phillips

Church

1975

Journal of Animal Science

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An in vitro study was conducted using a 4 • 2 • 2 factorial design with RAC (readily available carbohydrate) levels of 30, 40, 50 and 60%, tallow levels of 0 and 3%, and urea levels of 0 and 2%. Acetic and propionic acid production and ammonia disappearance increased as the level of RAC increased from 30 to 50%. Tallow reduced acetic acid production and increased the amount of propionic acid produced. Urea increased VFA production and ammonia disappearance. There was a tallow • urea interaction for acetic, propionic and butyric acid production as well as for ammonia disappearance. The interactions resulted in a significant decrease in acetic and butyric acid production and ammonia disappearance when tallow and urea were added simultaneously. Three metabolism studies were conducted to observe the effects of various combinations of tallow and urea as well as the effects of tallow in combination with biuret or cottonseed meal. Data from trial 1 indicated that the addition of urea resulted in higher crude protein digestibility and nitrogen retention. Lambs receiving 3% tallow plus urea retained more nitrogen than lambs receiving 5% tallow plus urea or the negative control. Data from trial 2 indicated that crude protein from urea or biuret was digested and retained more efficiently than that from cottonseed meal when the rations contained 5% tallow. In trial 3, 2.17% urea, in the presence of 5% tallow, resulted in an improved nitrogen balance as compared to rations with 1.5 or 1.16% urea. Digestibility of crude protein was not affected, but plasma urea increased as urea levels increased. t Oregon Agricultural Experiment Station Technical Paper No. 3736. 2Partially funded by the Fats and Proteins Re

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Nutrients

Matsushima¹

1979

Advanced Series in Agricultural Sciences

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Utilization of Urea and Fat in Meal and Pelleted Rations for Steers

Cited by 14 publications

References 0 publications

Influence of Level and Source of Dietary Fat on Its Comparative Feeding Value in Finishing Diets for Steers: Feedlot Cattle Growth and Performance

Influence of Level and Source of Dietary Fat on Its Comparative Feeding Value in Finishing Diets for Steers: Feedlot Cattle Growth and Performance

Effects of Tallow and Urea on in Vitro Rumen Fermentation and Nutrient Digestion in Sheep

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