“Extra Caloric” Effect of Dietary Fat for Developing Turkeys as Influenced by Calorie-Protein Ratio

Jensen, L. S.; Schumaier, George; Latshaw, J. D.

doi:10.3382/ps.0491697

Cited by 95 publications

(60 citation statements)

References 6 publications

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“…from 16 to 20 weeks and 2.0 or more from 20 to 24 weeks were necessary for optimum performance. The increased lysine levels in the studies of both Waibel (1972) and Jensen et al (1970), however, were obtained by increasing the protein levels. Therefore, the better performance of turkeys may have been due to some other amino acid or to a balance of amino acids rather than simply to the increase in lysine content.…”

Section: Discussionmentioning

confidence: 53%

“…The growth rate was particularly depressed from 17 to 24 weeks of age, suggesting that lysine was a limiting amino acid. Two calorie-protein ratios in diets containing different levels of added fat were compared for developing turkeys to 24 weeks of age by Jensen et al (1970). Comparison of the calculated calorie-lysine ratios from that study with the performance of turkeys from 16 to 24 weeks of age indicates that 2.9 or more g. lysine/mcal.…”

Section: Discussionmentioning

confidence: 99%

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Lysine Needs of Rapidly Growing Turkeys from 12–22 Weeks of Age

et al. 1976

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Two experiments were conducted with Large White male turkeys to investigate the lysine requirement from 12 to 22 weeks of age. Six pens of 20 turkeys were fed each of the experimental diets. In experiment 1, a basal diet containing wheat, meat meal, cottonseed meal and distillers dried grains with solubles was supplemented with four levels of L-lysine. Lysine at 4.27% of protein and 2.31 g./mcal. of metabolizable energy from 16 to 20 weeks of age, and 1.83 g. from 20 to 22 weeks of age was inadequate for optimum growth and feed efficiency (16-22 weeks). Supplementing the diet with lysine from soybean meal gave performance equivalent to synthetic lysine, indicating that it was fully available. Performance of turkeys fed a diet containing 88% triticale from 16 to 20 weeks of age, and 72% from 20 to 22 weeks of age was equivalent to that of turkeys fed a more complex ration with an equivalent level of lysine. In experiment 2, Large White male turkeys were fed a basal diet composed largely of triticale and soybean meal from 12 to 20 weeks of age with different levels of added lysine. From 12 to 16 weeks of age, 3.11 g. lysine/mcal. of M.E. (4.9% of protein) was adequate for optimum growth and feed efficiency. From 16-20 weeks of age 2.36 g. lysine/mcal. of M.E. (4.3% of protein) was adequate for optimum performance. Although the estimated requirement from 16 to 20 weeks of age based on the two experiments differs (perhaps because of differences in lysine availability), the results suggest that the current N.R.C. recommendation may be higher than necessary.

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Section: Discussionmentioning

confidence: 53%

Section: Discussionmentioning

confidence: 99%

Lysine Needs of Rapidly Growing Turkeys from 12–22 Weeks of Age

et al. 1976

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“…The two diets differed only in the substitution of soyabean oil for Downloaded by [JAMES COOK UNIVERSITY] at 05:28 16 March 2015 cassava in the high energy diets. This difference indicates that the high fat content of the high energy diet may have resulted in an "extracaloric" effect (Jensen et al, 1970). The high fat content did not, however, have any beneficial effect on energy requirement for growth as has also been reported by Sinurat andBalnave (1985).…”

Section: Temperature and Broiler Carcase Retentionmentioning

confidence: 59%

Effects of environmental temperature, dietary energy, sex and age on nitrogen and energy retention in the edible carcase of broilers

Sonaiya¹

1989

British Poultry Science

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1. Two environmentally-controlled houses, one set at constant 21°C (low temperature, LT) and the other set at diurnally cycling 21°C to 30°C (high temperature, HT), and two dietary energy concentrations of 13 MJ ME/kg (low energy, LE) and 13.8 MJ ME/kg (high energy, HE) were used to study nitrogen and energy retention in the edible carcase of male and female broilers slaughtered at 34 and 54 days. 2. Carcase nitrogen was higher in males than in females, and in birds reared at LT than in those reared at HT. 3. Birds at LT and on HE diet, regardless of sex, retained more energy as fat in their carcases than those at HT and on LE diet respectively. 4. Maintenance energy requirement averaged 6.70, 7.67, 7.43 and 9.01 kJ per g metabolic body size (kJ/gW 0.66) for broilers at HT and LT up to 34 d and at HT and LT up to 54 d, respectively. 5. There was a similar increase with age in the energy requirement for growth but with requirements of broilers at LT consistently lower than for those at HT.

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“…T HE magnitude of the extra-caloric value of dietary fat for developing turkeys was estimated in previous studies at this laboratory (Jensen et al, 1970). A formula was used to calculate "adjusted" metabolizable energy (M.E.)…”

Section: Introductionmentioning

confidence: 99%

Effect of Pelleting on the “Extra Caloric” Effect of Dietary Fat for Developing Turkeys

Jensen

Falen

1973

Poultry Science

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Large White developing turkeys were fed rations containing 0, 3 and 6% added fat in pelleted and unpelleted forms from 8-24 weeks of age. Growth rate was not affected but feed efficiency was significantly improved by each increment of added fat and by pelleting the rations containing 0 and 3% added fat. Feed efficiency in the ration containing 6% added fat was not improved by pelleting, but this diet failed to pellet adequately and the ration was similar in physical form to the unpelleted ration when fed to the birds. The "extra caloric" effect of added fat was observed in both pelleted and unpelleted rations when the physical form of the pellet was retained.

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“Extra Caloric” Effect of Dietary Fat for Developing Turkeys as Influenced by Calorie-Protein Ratio

Cited by 95 publications

References 6 publications

Lysine Needs of Rapidly Growing Turkeys from 12–22 Weeks of Age

Lysine Needs of Rapidly Growing Turkeys from 12–22 Weeks of Age

Effects of environmental temperature, dietary energy, sex and age on nitrogen and energy retention in the edible carcase of broilers

Effect of Pelleting on the “Extra Caloric” Effect of Dietary Fat for Developing Turkeys

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